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It's frustrating once you get an error after sending an e-mail message. This subject describes what you can do if you happen to see error code 5.7.1 in a non-delivery report (also known as an NDR, bounce message, delivery status notification, or DSN). This information additionally applies to error codes 5.7.0 via 5.7.999.

This info also applies to error codes 5.7.0 through 5.7.999 in Exchange Online and Microsoft 365 or Office 365. There might be several causes for dsn error code 5.7.1, for which options are offered later on this topic.

Why did I get this bounce message?

Typically, this error signifies a safety setting in your group or the recipient's organization is preventing your message from reaching the recipient. For example:

- You don't have permission to ship to the recipient.- The recipient is a bunch, and you don't have permission to send to the group or considered one of its subgroups.- You don't have permission to send email by way of an electronic mail server that's between you and the recipient.- Your message was routed to the fallacious e-mail server.

I acquired this bounce message. How do I repair this challenge?

Typically, you cannot fix the issue your self. You'll want the recipient or the recipient's email admin to fix the configuration on their end. However, listed below are some steps you could try:

If the recipient is external (outside of your organization): Contact the recipient (by cellphone, in individual, etc.) and ask them to inform their e mail admin about your e mail delivery downside. Their e mail admin may need to reconfigure the recipient's mailbox so it accepts electronic mail from you.

If the recipient is an internal group: You might not have permission to send to the group or to certainly one of its subgroups. On this case, the NDR will embody the names of the restricted teams that you do not have permission to ship to. Ask the owner of the restricted group to grant you permission to send messages to the group. If you don't know the group's proprietor, you can find it in Outlook or Outlook on the net (previously referred to as Outlook Web App) by doing the next steps:

Outlook: Select the NDR, double-click on the group name on the To line, and then choose Contact.Outlook on the net: Select the NDR, choose the group identify on the To line, and then select Owner.

If you are sending to a large distribution group: Groups with more than 5,000 members have the following restrictions robotically utilized to them:

- Messages sent to the group require approval by a moderator.- Large messages can't be despatched to the group. However, senders of large messages will obtain a different NDR. For extra details about large messages, see Distribution group limits.

To resolve the problem, be part of the group, or ask the group's proprietor or moderator to approve your message. Refer them to the I'm the owner of a restricted group. What can I do? section later on this subject.

If not one of the previous steps apply or resolve your difficulty, contact the recipient's e-mail administrator, and refer them to the I'm an e-mail admin. How can I repair this problem? part later in this subject.

I'm the proprietor of a restricted group. What can I do?

If a message sender acquired this NDR when they attempted to send a message to your group, and you want them to efficiently send messages to your group, attempt one of the following steps:

Remove the sender restriction: Change your group settings to unblock the sender in one of the following ways:

- Add the sender to the group's allowed senders checklist. Note that you have to create a mail contact or a mail consumer to signify the exterior sender in your organization.- If the sender is restricted because they're exterior (exterior your group), configure the group to accept messages from exterior senders.- If you've got configured a mail circulate rule (also called a transport rule) to restrict certain senders or teams of senders, you'll be able to modify the rule to simply accept messages from the sender.

Restrictions on massive groups: Groups with greater than 5,000 members have the following restrictions robotically applied:

- Messages sent to the group require approval by a moderator.- Large messages cannot be despatched to the group (however you may receive a different NDR from this one if that is the problem). See Exchange Online Limits.

To resolve the issue for the sender, approve their message, or add them to the group.

Managing distribution teams

Configure moderated recipients in Exchange OnlineCreate and handle distribution teams in Exchange Online

I'm an electronic mail admin. How can I fix this subject?

The sender is exterior (exterior your group)

If only this recipient is having problem accepting messages from external senders, configure the recipient or your e mail servers to accept messages from external or anonymous senders.

The recipient is a public folder in your Exchange Online group

When the recipient is a mail-enabled public folder in your Exchange Online organization, an external sender will receive an NDR with the next error code:

Remote Server returned ' #5.7.1 smtp;550 5.7.1 RESOLVER.RST.AuthRequired; authentication required [Stage: CreateMessage]'

To configure the public folder to just accept messages from external senders, comply with these steps:

New EAC

Go to Public folders > Public folders.

Choose a public folder from the listing, after which click on Edit .

Click Mail stream settings.

Under Message Delivery Restrictions > Accept messages from, carry out the next tasks:

Classic EAC

Open the Exchange admin heart (EAC). For more information, see alternate admin middle in alternate online.

Within the EAC, go to Public folders > Public folders > select the general public folder from the list, after which click on Edit .

In the public folder properties dialog field that opens, go to Mail flow settings, and configure the following settings in the Accept messages from section:

- Clear the test box for Require that each one senders are authenticated.- Select All senders.

Click Save.

The sender is exterior and their source IP deal with is on Microsoft's blocklist

In this case, the NDR the sender receives would come with data in the Diagnostics for administrators section much like the next data:

5.7.1 Service unavailable; Client host [xxx.xxx.xxx.xxx] blocked using Blocklist 1; To request removal from this checklist please ahead this message to delist@microsoft.com

To take away the restriction on the sender's source electronic mail system, ahead the NDR message to delist@microsoft.com. Also see Use the delist portal to remove yourself from the blocked senders record.

Your domain isn't fully enrolled in Microsoft 365 or Office 365

If your domain is not absolutely enrolled in Microsoft 365 or Office 365, attempt the next steps:

- Verify your area seems as Healthy in the Microsoft 365 admin heart at Settings > Domains.- For details about adding your domain to Microsoft 365 or Office 365, see Add a site to Microsoft 365.- To troubleshoot area verification issues, see Troubleshoot area verification issues in Office 365.

Your domain's MX report has a problem

When you've got an incorrect MX file, attempt the following steps:

Check the sender and recipient domains for incorrect or stale MX information by utilizing the Advanced diagnostics > Exchange Online check within the Microsoft Support and Recovery Assistant. For more data in regards to the Support and Recovery Assistant, see In regards to the Microsoft Support and Recovery Assistant.

Check together with your area registrar or DNS hosting service to confirm the MX record on your area is appropriate. The MX report for a site that's enrolled in Exchange Online uses the syntax _\_.mail.protection.outlook.com.

Verify Inbound SMTP Email and Outbound SMTP Email at Office 365 > Mail Flow Configuration in the Microsoft Remote Connectivity Analyzer.

Verify you have got just one MX file configured in your area. Microsoft would not support utilizing a couple of MX record for a domain that's enrolled in Exchange Online.

Your area's SPF report has a problem

The Sender Policy Framework (SPF) document to your domain might be incomplete, and might not include all email sources in your area. For more info, see Arrange SPF to help stop spoofing.

Hybrid configuration points

In case your domain is a part of a hybrid deployment between on-premises Exchange and Exchange Online, the Hybrid Configuration Wizard should automatically configure the required connectors for mail move. Even so, you should utilize the steps in this part to verify the connector settings.

Open the Microsoft 365 admin middle at https://portal.microsoftonline.com, and click on Admin > Exchange.

In the Exchange admin center, click on Mail Flow > Connectors. Select the connector that's used for hybrid, and choose Edit. Verify the next info:

Delivery: If Route mail by way of smart hosts is selected, verify the right IP handle or FQDN is specified. If MX file related to the recipient area is selected, verify the MX document for the domain factors to the proper mail server.

You may test your MX file and your ability to send mail from your Exchange Online group by utilizing the Outbound SMTP Email take a look at within the Microsoft Remote Connectivity Analyzer.

Scope: If it's essential route inbound web mail to your on-premises Exchange group, Domains want to incorporate all e mail domains that are used in your on-premises organization. You need to use the worth asterisk (*) to also route all outbound web mail through the on-premises group.

If the connectors are configured incorrectly, your Exchange administrator needs to rerun the Hybrid Configuration Wizard in the on-premises Exchange organization.

When you disable an on-premises Active Directory account, you may get the next error message:

Your message could not be delivered to the recipient as a result of you don't have permission to ship to it. Ask the recipient's email admin to add you to the accept list for the recipient. For more info, see DSN 5.7.129 Errors in Exchange Online and Microsoft 365 or Office 365.

To stop all communication with the Exchange Online mailbox, you must delete the on-premises person account instead of disabling it.

Another answer can be to take away the license, but then you'd have to create a mail move rule (often known as a transport rule) to stop the user from receiving email messages. Otherwise, the user would continue to receive messages for about 30 days after elimination of the license.

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