Fix email commitment problems for error code 550 4.4.seven in Exchange Online

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It's frustrating when you lot go an error afterward sending an email message. This article describes what you can do if you see error code 550 four.4.seven in a non-delivery report (also known as an NDR, bounce bulletin, delivery status notification, or DSN).

Why did I get this bounce message?

For more information, see the Causes for fault code iv.four.seven section later in this commodity.

Use the information in the NDR to help y'all decide how to fix the problem.
Email user icon. I got this bounce message. How do I gear up it? Email admin icon I'chiliad an email admin. How do I gear up this? Help symbol Causes for error code 4.4.7

I got this bounciness bulletin. How do I fix information technology?

This section contains the steps that yous can try to fix the problem yourself.

If the steps in this section don't gear up the problem for you, contact your email admin and refer them to this article then they can try to resolve the issue for y'all.

If you get this error only for messages that you sent to a specific domain (for example, only recipients in the @fabrikam.com domain), the problem is likely with that destination domain. For example:

  • Temporary network or internet connection problems in the destination domain.

  • Aggressive anti-spam settings in the destination domain that block legitimate senders (for example, all senders from any domain in Commutation Online).

If you suspect a trouble with the destination domain, notify the recipient (by phone, in person, etc.) with the information in the NDR so they can notify their email admins:

  • The name of the email mail server in the destination domain, and the fault bulletin that's returned by the electronic mail server.

  • The number of delivery attempts made that were fabricated by the datacenter server in Commutation Online, and how long information technology tried to achieve the remote server.

The email admins in the destination domain volition need to investigate the result. Possible solutions might include:

  • Stop blocking letters from Substitution Online or specifically let messages from senders in your domain.

  • Contact the support channels for their email server or service. Microsoft support might also be able to help.

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

If the admins in the destination domain determine the problem isn't on their end, the solution might be related the configuration of your Substitution Online organization (or as well your on-bounds Exchange system if yous're in a hybrid deployment).

Here are some steps for you to endeavour:

  • Solution 1: The MX record for your domain might be missing or incorrect. Go more than information about how MX records piece of work at DNS basics.

  • Solution 2: Test your MX record and your organization's ability to send mail service by using the Outbound SMTP E-mail examination in the Microsoft Remote Connectivity Analyzer.

  • Solution 3: The Sender Policy Framework (SPF) record for your domain might be incomplete, and might non include all email sources for your domain. For more than information, meet Set up upwards SPF to aid forbid spoofing.

  • Solution four: Your domain might have expired due to non-payment. Verify with your domain registrar that your domain is active and not expired.

  • Solution v: If the recipient is in your on-premises Exchange organization in a hybrid deployment, at that place might be a trouble with your hybrid configuration. Give the information in the NDR to your on-premises Substitution administrators. They might need to rerun the Hybrid Configuration Wizard due to changes in their on-premises IP addresses or firewall rules.

For more than information near message routing in hybrid deployments, see Transport routing in Substitution hybrid deployments.

Causes for error code four.four.7

When Exchange Online attempts to deliver a message, the destination email might be unable or unwilling to have the message. This can result in a temporary 4_.x.x_ error code from the destination email server (instead of a permanent 5.x.ten error code that indicates the bulletin was rejected). Exchange Online repeatedly tries to deliver the message over 24 hours. Simply after 2 days of unsuccessful delivery attempts practice the recipient receive this NDR.

The possible causes of this mistake are:

  • The destination email server is offline or unreachable.

  • The server won't accept delivery of the message.

  • A network problem is causing message delivery to time out.

Details for fault code 5.1.0

The NDR from Exchange Online for this specific fault might contain some or all of the following information:

  • User data section

    • The server has tried to deliver this message, without success, and has stopped trying. Effort sending this message again. If the problem continues, contact your assistance desk.

  • Diagnostic information for administrators section

    • #550 four.iv.7 QUEUE.Expired; message expired ##

    • The message was considered too erstwhile by the rejecting system, either considering it remained on that host too long or because the time-to-alive value specified by the sender of the message was exceeded.

    • 450 4.vii.0 Proxy session setup failed on Frontend with '451 4.4.0 Principal target IP address responded with ... Be sure to record the mistake that follows this string and the last finish indicate attempted.

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E-mail not-delivery reports in Exchange Online