Resolved Emails are bouncing back

[zed2007]

Server operating system version

CentOS Linux 7.9.2009 (Core)

Plesk version and microupdate number

Version 18.0.50 Update #2

Emails that should be order confirmation are returned back.
with the following error description:

Received: (qmail 31260 invoked for bounce); 21 Mar 2023 17:39:48 +0100
Date: 21 Mar 2023 17:39:48 +0100
From: [email protected]
To: [email protected]
Subject: failure notice

 

[zed2007]

Here is also the qmail log.

 

[Peter Debik]

Could you please check if the log can be more complete for a single transaction? Normally there should be several lines per send attempt and at least one will give a clear error message why the mail cannot be transferred to the recipient's server.

 

[zed2007]

Thanks you for the answer. Here are some more examples from the log.

 

[Peter Debik]

According to web.de:

"Emails will be rejected by our mail system if the information provided in the email header does not meet the specifications in RFC 5321 and RFC 5322.

This includes the following:

The following headers must be syntactically correct: Date, From, Sender, To
The headers BCC, CC, Date, From, Sender, Subject and To must not occur more than once.

Usually, in these cases, there is a syntax error in an e-mail address specified in the From or To field. A common cause is, for example, non-coded umlauts or semicolons instead of commas when specifying multiple addresses.

Therefore, please check the information provided by your system for correctness and contact the administrators of your system if necessary."

 

[zed2007]

Thaks a lot. This helped me solve my problem. There was redirection...