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ishtari
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Bounced Mail #5.5.0 smtp;552 Unable to process message

A user got the following message today when sending email to one domain. However the messages has arrived to at least 3 of the recipients, which the user confirmed by telephone.

I tried to google it, but only found that 552 means the message was too large, which doesn't seem probable since it has been received.

There was a SMTP communication problem with the recipient's email server.  Please contact your system administrator.

<ourDomain #5.5.0 smtp;552 Unable to process message:

msg.1236927854.923664.5617 - error: recipient: user1@theirDomain failed, reason: Giving up on theirIP. 550 user1@theirDomain... No such user, recipient: user2@theirDomain failed, reason: Giving up on theirIP. 550 user2@theirDomain... No such user, recipient: user3@theirDomain failed, reason: Giving up on theirIP. 550 user3@theirDomain... No such user>
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ishtari

8/22/2022 - Mon
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suppsaws

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ishtari

ASKER
The colleague that sent the emails said that she had got a message from one of the recipients where the recipient had asked why we had sent the message 4 times (my colleague sent it more then once). Because of that my colleague phoned up the recipients and at least 3 had got the message.

The colleague is out to lunch, but I will double check when she got back that the recipients that received the message are the once that are included in the error message.
ishtari

ASKER
Thanks for the fast response! :)
suppsaws

It's still the remote site that you should look at, your user is sending just fine, the problem relies on the target server, unless he has typed the email address wrong.
Your help has saved me hundreds of hours of internet surfing.
fblack61
ishtari

ASKER
Yeah, that seems more probable the more I read about the error. Told the user to recheck spelling.