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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(153.6, 55.00000000000001%, 24%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EA%3C/text%3E%3C/svg%3E)
We have Exchange2016 Hybrid setup and I am experiencing following error:
Server at b.domain.com (x.x.x.x) returned '400 4.4.7 Message delayed'
11/20/2022 5:43:18 PM - Server at b.domain.com (x.x.x.x) returned '451 4.4.397 Error communicating with target host. -> 421 4.2.1 Unable to connect -> SocketTimedout: Socket error code 10060'
Please advise.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(41.6, 80%, 14%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EAL%3C/text%3E%3C/svg%3E)
Hi @ATFRMZ ,
Just checking in to see how things are going on with this thread.
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Hi @ATFRMZ ,
Are you getting this error when you mails to other domains?
If this error only occurs when sending to the same domain, the issue is caused by their server's settings(b.contoso.com).Therefore, we recommend that you contact their administrator to allow receiving your messages.
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@Aholic Liang-MSFT I advised end user to check with the recipient administrator already, so far they have not come back.
Hi,
Thank you for letting us know the current status of this issue. Hopefully it can be resolved soon! If there are more updates to this issue, please feel free to post back.
Hi @ATFRMZ ,
It has been a few days and I am checking in to see how things are going on with this issue.
Does this issue have any updates? If it has been resolved, please click "Accept as answer" to mark useful post or share your solution, your action would benefit others who have similar issues. If you have any questions or need further assistance, please feel free to post back. Thanks!