2/1/2022

What Is My Public Ip4 Address

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When there's a problem delivering an email message that you sent, Microsoft 365 or Office 365 sends an email to let you know. The email you receive is a delivery status notification, also known as a DSN or bounce message. The most common type is called a non-delivery report (NDR) and they tell you that a message wasn't delivered. Non-delivery can be caused by something as simple as a typo in an email address. NDRs include an error code that indicates why your email wasn't delivered, solutions to help you get your email delivered, a link to more help on the web, and technical details for administrators. Find out What's included in an NDR?.

Find my NDR code and get help delivering my email

The following table contains the NDR codes (also called enhanced status codes) for the most common bounce messages and NDRs that you might encounter in Exchange Online.

A VPN server works by masking your real IP address with the VPN server’s IP address all the time. This is how it works without a VPN IP address: When you visit a website, your ISP makes a connection request on your behalf with the destination, but uses your true IP address. In this process, your public IP address. Mar 04, 2019 All IP addresses, except private IP addresses, are included in Public IP. You can refer above table for Private IP addresses and their range. How to check Public IP address? So, now we know, that Public IP address is a unique IP address, which can be assigned only a system. In order to check your public IP address you can visit the following. Jul 03, 2017 The easiest way to find your public IP address is by asking a website, since that website sees your public IP address and can tell it to you.

NDR codeDescriptionPossible causeAdditional information
432 4.3.2STOREDRV.Deliver; recipient thread limit exceededThe recipient mailbox's ability to accept messages is being throttled because it's receiving too many messages too quickly. This is done so a single recipient's mail processing doesn't unfairly impact other recipients sharing the same mailbox database.See Store Driver Fault Isolation Improvements in Exchange 2010 SP1 for more details about this by-design throttling.
4.4.316Connection refused [Message=Socket error code 10061]Microsoft 365 or Office 365 is trying to send a message to an email server outside of Microsoft 365 or Office 365, but attempts to connect to it are failing due to a network connection issue at the external server's location.This error almost always indicates an issue with the receiving server or network outside of Microsoft 365 or Office 365. The error should also include the IP address of the server or service that's generating the error, which you can use to identify the party responsible for fixing this.
4.4.7Message expiredThe message in the queue has expired. The sending server tried to relay or deliver the message, but the action was not completed before the message expiration time occurred. This message can also indicate that a message header limit has been reached on a remote server, or some other protocol time-out occurred while communicating with the remote server.This message usually indicates an issue on the receiving server. Check the validity of the recipient address, and determine if the receiving server is configured correctly to receive messages.

You might have to reduce the number of recipients in the message header for the host about which you are receiving this error. If you send the message again, it is placed in the queue again. If the receiving server is available, the message is delivered.

For more information, see Fix email delivery issues for error code 4.4.7 in Exchange Online.

4.5.3Too many recipientsThe message has more than 200 SMTP envelope recipients from the same domain.An envelope recipient is the original, unexpanded recipient that's used in the RCPT TO command to transmit the message between SMTP servers. When this error is returned by Microsoft 365 or Office 365, the sending server must break up the number of envelope recipients into smaller chunks (chunking) and resend the message.
4.7.26Access denied, a message sent over IPv6 [2a01:111:f200:2004::240] must pass either SPF or DKIM validation, this message is not signedThe sending message sent over IPv6 must pass either SPF or DKIM.For more details, see Support for anonymous inbound email messages over IPv6.
4.7.500-699Access denied, please try again laterSuspicious activity has been detected and sending has been temporarily restricted for further evaluation.If this activity is valid, this restriction will be lifted shortly.
4.7.850-899Access denied, please try again laterSuspicious activity has been detected on the IP in question, and it has been temporarily restricted while it is being further evaluated.If this activity is valid, this restriction will be lifted shortly.
5.0.350Generic error or x-dg-ref header is too long5.0.350 is a generic catch-all error code for a wide variety of non-specific errors from the recipient's email organization. The specific x-dg-ref header is too long message is related to Rich Text formatted messages. For more information, see Fix email delivery issues for error code 550 5.0.350 in Exchange Online.
5.1.0Sender deniedA common cause of this NDR is when you use Microsoft Outlook to save an email message as a file, and then someone opened the message offline and replied to it. The message property only preserves the legacyExchangeDN attribute when Outlook delivers the message, and therefore the lookup could fail.Either the recipient address is incorrectly formatted, or the recipient could not be correctly resolved. The first step in resolving this error is to check the recipient address, and send the message again.

For more information, see Fix email delivery issues for error code 5.1.0 in Exchange Online.

5.1.1Bad destination mailbox addressThis failure might be caused by the following conditions:
  • The recipient's email address was entered incorrectly by the sender.
  • No recipient's exists in the destination email system.
  • The recipient's mailbox has been moved and the Outlook recipient cache on the sender's computer has not updated.
  • An invalid legacy domain name (DN) exists for the recipient's mailbox Active Directory Domain Service.
This error typically occurs when the sender of the message incorrectly enters the email address of the recipient. The sender should check the recipient's email address and send again. This error can also occur if the recipient email address was correct in the past but has changed or has been removed from the destination email system.

If the sender of the message is in the same organization as the recipient, and the recipient's mailbox still exists, determine whether the recipient's mailbox has been relocated to a new email server. If this is the case, Outlook might not have updated the recipient cache correctly. Instruct the sender to remove the recipient's address from sender's Outlook recipient cache and then create a new message. Resending the original message will result in the same failure.

For more information, see Fix email delivery issues for error code 5.1.1 through 5.1.20 in Exchange Online.

5.1.8Access denied, bad outbound senderThe account has been blocked for sending too much spam. Typically, this problem occurs because the account has been compromised (hacked) by phishing or malware.For more information, see Fix email delivery issues for error code 5.1.8 in Exchange Online.
5.1.10Recipient not foundThe recipient's was not found by SMTP address lookup.For more information, see Fix email delivery issues for error code 550 5.1.10 in Exchange Online.
5.2.2Submission quota exceededThe sender has exceeded the recipient rate limit or the message rate limit as described in Sending limits.This could indicate the account has been compromised and is being used to send spam. For more information, see How to determine whether your account has been compromised.
5.2.121Recipient's per hour message receive limit from specific sender exceeded.The sender has exceeded the maximum number of messages they're allowed to send per hour to a specific recipient in Exchange Online.The automated mailer or sender should try again later, and reduce the number of messages they send per hour to a specific recipient.

This limit helps protect Microsoft 365 or Office 365 users from rapidly filling their inboxes with a large number of messages from errant automated notification systems or other single-sender mail storms.

5.2.122Recipient's per hour message receive limit exceeded.The Microsoft 365 or Office 365 recipient has exceeded the number of messages they can receive per hour from all senders.The automated mailer or sender should try again later, and reduce the number of messages they send per hour to a specific recipient.

This limit helps protect Microsoft 365 and Office 365 users from rapidly filling their inboxes with a large number of messages from errant automated notification systems or other mail storms.

5.3.190Journaling on-premises messages to Microsoft 365 or Office 365 not supported when Journaling Archive is disabled.Journaling on-premises messages to Microsoft 365 or Office 365 isn't supported for this organization because they haven't turned on Journaling Archive in their settings.A journaling rule is configured in the organization's on-premises environment to journal on-premises messages to Microsoft 365 or Office 365, but Journaling Archive is disabled. For this scenario to work, the organization's Office 365 administrator should either enable Journaling Archive or change the journaling rule to journal messages to a different location.
5.4.1Relay Access DeniedThe mail server that's generating the error doesn't accept mail for the recipient's domain. This error is generally caused by mail server or DNS misconfiguration.For more information, see Fix email delivery issues for error code 5.4.1 in Exchange Online.
5.4.6 or 5.4.14Routing loop detectedA configuration error has caused an email loop. 5.4.6 is generated by on-premises Exchange server (you'll see this code in hybrid environments). 5.4.14 is generated by Exchange Online.

By default, after 20 iterations of an email loop, Exchange interrupts the loop and generates an NDR to the sender of the message.

This error occurs when the delivery of a message generates another message in response. That message then generates a third message, and the process is repeated, creating a loop. To help protect against exhausting system resources, Exchange interrupts the mail loop after 20 iterations. Mail loops are typically created because of a configuration error on the sending mail server, the receiving mail server, or both. Check the sender's and the recipient's mailbox rules configuration to determine whether automatic message forwarding is enabled.

For more information, see Fix email delivery issues for error code 5.4.6 or 5.4.14 in Exchange Online.

5.4.300Message expiredThe email took too long to be successfully delivered, either because the destination server never responded or the sent message generated an NDR error and that NDR could not be delivered to the original sender.
5.6.11Invalid charactersYour email program added invalid characters (bare line feed characters) into a message you sent.For more information, see Fix email delivery issues for error code 5.6.11 in Exchange Online.
5.7.1Delivery not authorizedThe sender of the message is not allowed to send messages to the recipient.This error occurs when the sender tries to send a message to a recipient but the sender is not authorized to do this. This frequently occurs when a sender tries to send messages to a distribution group that has been configured to accept messages only from members of that distribution group or other authorized senders. The sender must request permission to send messages to the recipient.

This error can also occur if an Exchange transport rule rejects a message because the message matched conditions that are configured on the transport rule.

For more information, see Fix email delivery issues for error code 5.7.1 in Exchange Online.

5.7.1Unable to relayThe sending email system is not allowed to send a message to an email system where that email system is not the final destination of the message.This error occurs when the sending email system tries to send an anonymous message to a receiving email system, and the receiving email system does not accept messages for the domain or domains specified in one or more of the recipients. The following are the most common reasons for this error:
  • A third party tries to use a receiving email system to send spam, and the receiving email system rejects the attempt. By the nature of spam, the sender's email address might have been forged, and the resulting NDR could have been sent to the unsuspecting sender's email address. It is difficult to avoid this situation.
  • An MX record for a domain points to a receiving email system where that domain is not accepted. The administrator responsible for the specific domain name must correct the MX record or configure the receiving email system to accept messages sent to that domain, or both.
  • A sending email system or client that should use the receiving email system to relay messages does not have the correct permissions to do this.

For more information, see Fix email delivery issues for error code 5.7.1 in Exchange Online.

5.7.1Client was not authenticatedThe sending email system did not authenticate with the receiving email system. The receiving email system requires authentication before message submission.This error occurs when the receiving server must be authenticated before message submission, and the sending email system has not authenticated with the receiving email system. The sending email system administrator must configure the sending email system to authenticate with the receiving email system for delivery to be successful.

For more information, see Fix email delivery issues for error code 5.7.1 in Exchange Online.

5.7.12Sender was not authenticated by organizationThe sender's message is rejected because the recipient address is set up to reject messages sent from outside of its organization. Only an email admin for the recipient's organization can change this.For more information, see Fix email delivery issues for error code 5.7.12 in Exchange Online.
5.7.23The message was rejected because of Sender Policy Framework violationThe destination email system uses SPF to validate inbound mail, and there's a problem with your SPF configuration.For more information, see Fix email delivery issues for error code 5.7.23 in Exchange Online.
5.7.57Client was not authenticated to send anonymous mail during MAIL FROMYou configured an application or device to send (relay) email messages in Microsoft 365 or Office 365 using the smtp.office365.com endpoint, and there's a problem with the configuration of the application or device.For more information, see Fix email delivery issues for error code 5.7.57 in Exchange Online.
5.7.64TenantAttribution; Relay Access DeniedYou use an inbound connector to receive messages from your on-premises email environment, and something has changed in your on-premises environment that makes the inbound connector's configuration incorrect.For more information, see Fix email delivery issues for error code 5.7.64 in Exchange Online.
5.7.124Sender not in allowed-senders listThe sender doesn't have permission to send to the distribution group because the sender is not in the group's allowed-senders list. Depending how the group is set up, even the group's owner might need to be added to the allowed sender list in order to send messages to the group.For more information, see Fix email delivery issues for error code 5.7.124 in Exchange Online.
5.7.133Sender not authenticated for groupThe recipient address is a group distribution list that is set up to reject messages sent from outside of its organization. Only an email admin for the recipient's organization or the group owner can change this.For more information, see Fix email delivery issues for error code 5.7.133 in Exchange Online.
5.7.134Sender was not authenticated for mailboxThe recipient address is a mailbox that is set up to reject messages sent from outside of its organization. Only an email admin for the recipient's organization can change this.For more information, see Fix email delivery issues for error code 5.7.134 in Exchange Online.
5.7.13 or 135Sender was not authenticated for public folderThe recipient address is a public folder that is set up to reject messages sent from outside of its organization. Only an email admin for the recipient's organization can change this.For more information, see Fix email delivery issues for error code 5.7.13 or 5.7.135 in Exchange Online.
5.7.136Sender was not authenticatedThe recipient address is a mail user that is set up to reject messages sent from outside of its organization. Only an email admin for the recipient's organization can change this.For more information, see Fix email delivery issues for error code 5.7.136 in Exchange Online.
5.7.25Access denied, the sending IPv6 address [2a01:111:f200:2004::240] must have a reverse DNS recordThe sending IPv6 address must have a reverse DNS record in order to send email over IPv6.For more details, see Support for anonymous inbound email messages over IPv6.
5.7.501Access denied, spam abuse detectedThe sending account has been banned due to detected spam activity.For details, see Fix email delivery issues for error code 451 5.7.500-699 (ASxxx) in Exchange Online.

Verify that any account issues have been resolved, and reset its credentials. To restore this account's ability to send mail, contact support through your regular channel.

5.7.502Access denied, banned senderThe sending account has been banned due to detected spam activity.Verify that any account issues have been resolved, and reset its credentials. To restore this account's ability to send mail, please contact support through your regular channel.
5.7.503Access denied, banned senderThe sending account has been banned due to detected spam activity.Verify that any account issues have been resolved, and reset its credentials. To restore this account's ability to send mail, please contact support through your regular channel.
5.7.504[[email protected]]: Recipient address rejected: Access deniedThe recipient address that you are attempting to contact is not valid.Verify the recipient's email address, and try again.
5.7.505Access denied, banned recipientThe recipient that you are attempting to contact is not valid.If you feel this is in error, contact support.
5.7.506Access Denied, Bad HELOYour server is attempting to introduce itself (HELO according to RFC 821) as the server it is trying to connect to, rather than its own fully qualified domain name.This is not allowed, and it is characteristic of typical spambot behavior.
5.7.507Access denied, rejected by recipientThe IP that you are attempting to send from has been blocked by the recipient's organization.Contact the recipient in order to resolve this issue.
5.7.508Access denied, [$SenderIPAddress] has exceeded permitted limits within $range rangeThe sender's IPv6 range has attempted to send too many messages in too short a time period.Not applicable
5.7.509Access denied, sending domain [$SenderDomain] does not pass DMARC verificationThe sender's domain in the 5322.From address does not pass DMARC.Not applicable
5.7.510Access denied, [contoso.com] does not accept email over IPv6The sender is attempting to transmit a message to the recipient over IPv6, but the recipient does not accept email messages over IPv6.Not applicable
5.7.511Access denied, banned senderThe account you are attempting to send from has been banned.For more information, see Removing a user from the Restricted Users portal after sending spam email.
5.7.512Access denied, message must be RFC 5322 section 3.6.2 compliantMessage was sent without a valid 'From' email address.Office 365 only. Each message must contain a valid email address in the 'From' header field. Proper formatting of this address includes angle brackets around the email address, for example, <[email protected]>. Without this address Microsoft 365 or Office 365 will reject the message.
5.7.513Service unavailable, Client host [$ConnectingIP] blocked by $recipientDomain using Customer Block list (AS16012607)The recipient domain has added your sending IP address to its custom block list.The domain that received the email has blocked your sender's IP address. If you think your IP address has been added to the recipient domain's custom block list in error, you need to contact them directly and ask them to remove it from the block list.
5.7.606-649Access denied, banned sending IP [IP1.IP2.IP3.IP4]The IP that you are attempting to send from has been banned.Verify that you are following the best practices for email deliverability, and ensure your IPs' reputations have not been degraded as a result of compromise or malicious traffic. If you believe you are receiving this message in error, you can use the self-service portal to request to be removed from this list.

For more information, see Use the delist portal to remove yourself from the blocked senders list.

5.7.700-7495.7.705 Access denied, tenant has exceeded threshold, 5.7.708 Access denied, traffic not accepted from this IPThe majority of traffic from this tenant has been detected as suspicious and has resulted in a ban on sending ability for the tenant.Ensure that any compromises or open relays have been resolved, and then contact support through your regular channel.

For more information, see Fix email delivery issues for error codes 5.7.700 through 5.7.750 in Exchange Online.

5.7.750Service unavailable. Client blocked from sending from unregistered domainsA suspicious amount of messages from unprovisioned domains is coming from this tenant.Add and validate any and all domains that you use to send email from Microsoft 365 or Office 365.

For more information, see Fix email delivery issues for error codes 5.7.700 through 5.7.750 in Exchange Online.

n/aThe message can't be submitted because the sender's submission quota was exceededThe user account has exceeded the recipient rate limit (10,000 recipients per day).The account has likely been compromised.See Fix email delivery issues for error 'the sender's submission quota was exceeded' in Exchange Online.

What's included in an NDR?

IP address defined. IP stands for internet protocol and is an address consisting of numbers, separated by periods, that is assigned to you by your Internet Service Provider (ISP). It is used to identify your internet connection. They are also used for domain names on the web. Internet Protocol version 6 is the replacement for IPv4. First of all, an IPv6 address looks like this 2600:1005:b062:61e4:74d7:f292:802c:fbfd. While an IPv4 address looks like this 75.123.253.255.

Exchange NDRs are designed to be easy to read and understand by email users and administrators. There are a couple of different formats for NDRs. The newest style NDR contains a problem description in everyday language, along with steps to fix it. The following figure shows the format for this type of NDR.

Information provided in the newest style NDRs is designed to help the typical email user solve their problem immediately. When that isn't possible, the NDR provides details for administrators and also a link to more help on the web. The following fields appear in the newest Office 365 NDRs.

FieldDescription
Office 365 logoThis indicates that Microsoft 365 or Office 365 generated the NDR. The logo doesn't mean that Microsoft 365 or Office 365 was responsible for the error. This tells which messaging endpoints or services are involved in the email transaction, which is not always clear in older style NDRs.
CauseThis section provides the reason that the message wasn't delivered.
Fix-it owner indicatorThis section provides an at-a-glance view of the issue and who needs to fix it. The image shows the three basic parties in a Microsoft 365 or Office 365 email transaction: the sender, Microsoft 365 or Office 365, and the recipient. The area marked in red is where the problem usually must be fixed.
How to fix itThis section is designed for the end-user or the email sender who receives the NDR. It explains how to fix the issue.
More info for email adminsThis section provides a detailed explanation of the problem and solution along with technical details and a link to a web-based article that has detailed reference information.
Message hopsThis section contains times and system references for the message, which allows an admin to follow the message's hops or server-to-server path. With this info, an admin might quickly spot problems between message hops.

What Is My Public Ip4 Address Location

For NDRs that don't have the latest format, the information might be separated into two sections: User information, and Diagnostic information for administrators. The following figure shows the format for one type of Exchange Online NDR.

Address

User information

The user information section appears first in some NDRs, and the main purpose is to provide a summary about what went wrong. The text is designed to help the message sender determine why the message was rejected and, if possible, how to resend the message successfully. The email address of each recipient is listed, and the reason for the failure is included in the space below the recipient's email address. The name of the mail server that rejected the message might also be included in this section.

Diagnostic information for administrators

The Diagnostic information for administrators section provides deeper technical information to help administrators troubleshoot the message delivery problem. It contains detailed information about the specific error that occurred during delivery of the message, the server that generated the NDR, and the server that rejected the message. This section uses the following format:

FieldDescription
Generating serverThis field indicates the name of the SMTP mail server that created the NDR. If no remote server is listed below the sender's email address, the generating server is also the server that rejected the original email message. When the remote mail server acknowledges and accepts the message, but later rejects the message, for example, because of content restrictions, the remote server generates the NDR. If the remote mail server never acknowledges and never accepts the message, the sending server in Exchange Online generates the NDR.
<Rejected recipient>This value is the email address of the recipient. If delivery failed to more than one recipient, the email address for each recipient is listed. The following information is also included for each failed recipient:FieldDescription
<Remote server>This value is the name of the mail server that rejected the message. If the original message is successfully acknowledged by the receiving server, but is later rejected, the remote server value isn't populated.
<Enhanced status code>This value is assigned by the mail server that rejected the original message and indicates why the message was rejected. These codes are defined in RFC 3463, and use the format abc x.y.z, where the placeholder values are integers. For example, a 5.x.x code indicates a permanent error, and a 4.x.x code indicates a temporary error. Although the enhanced status code is often generated by an external mail server, Exchange Online uses the enhanced status code value to determine the text to display in the user information section.
<SMTP response>This value is returned by the mail server that rejected the original message. This text provides an explanation for the enhanced status code value. The text is always presented in US-ASCII format.
Original message headersThis section contains the message header fields of the rejected message. These header fields can provide useful diagnostic information, such as the path that the message took before it was rejected, or whether the To field value matches the rejected recipient value.
What is my public ipv4 address mac

How to interpret an Exchange NDR

Here's an example. Suppose you receive an Exchange NDR that contains the following information:

From the user information section, you can determine that the recipient is Ronald Slattery, and that the message was rejected by the mail server mail.contoso.com, which isn't an Exchange Online or Exchange Online Protection mail server.

From the Diagnostic information for administrators section, you can see that alpineskihouse.com attempted to connect to the server mail.contoso.com to deliver the message to the recipient [email protected] However, mail.contoso.com responded with the error 530 5.7.1 Client was not authenticated. Even though bigfish.com generated the NDR, mail.contoso.com actually rejected the message, so the administrators at contoso.com are responsible for understanding and fixing the problem. This particular error indicates that the server mail.contoso.com is configured not to accept anonymous email from the Internet.

Although the Original message headers are omitted from this example due to their length and complexity, you can typically extract useful information from the following header fields:

  • To: This field might be helpful if the email address was mistyped.

  • Received: These fields can tell you what the path was for the message, and the last hop that generated the delivery status notification if it isn't easy to tell from the Generating server value in the NDR.

  • Received-SPF: If this value is anything other than pass, check the Sender Policy Framework (SPF) DNS record for your domain. For more information, see Add or edit custom DNS records.

Still need help with NDRs or other status notifications?

Private IP Address

When more than one device is connected in a cable or wireless form such as mobile, computer etc., it creates a private IP address. The IP of all devices connected in it is called private address.

There are certain addresses in each class of IP address that are not assigned and are called private addresses. Private addresses can be used by hosts that use network address translation (NAT) to connect to a public network or by hosts that do not connect to the Internet. Three non-overlapping ranges of IPv4 addresses are reserved for private networks. In the same network there cannot be two equal addresses, but they can be repeated in two private networks that do not have a direct connection to each other or that are connected through a third party that does NAT. The private addresses are :

IPv4 network ranges reserved for private networks

IPv4 network ranges reserved for private networks
NameCIDR blockAddress rangeNumber of addressesClass
24-bit block10.0.0.0/810.0.0.0 - 10.255.255.25516 777 216A class.
20-bit block172.16.0.0/12172.16.0.0 - 172.31.255.2551,048,576Adjacent range of 16 class B blocks.
16-bit block192.168.0.0/16192.168.0.0 - 192.168.255.25565,536Adjacent range of 256 class C blocks.
Private

These IP address blocks are allocated for use in local area networks (they are not singular in the world) and are not directed by internet service providers in wide area networks. For this reason, NAT is made to real IP addresses when accessing the internet from these IP networks.

What Is My Public Ip4 Address Number

Public IP Address

What Is My Public Ip4 Address Ip

Public IP addresses can be of two types, first Static IP Address which is purchased by ISP (Internet Service Provider) to access a server. Public IP Address is provided by Internet Service Providers (ISPs) Which we cannot change, and this address is different, like, a website, DNS server etc.

My Private Ip

Secondly Dynamic IP Address, is based on an Internet connection and automatically changes when the computer is connected to the Internet.