Periodic delivery of same incoming mail

[st171296]

Hi,
recently I migrated from eFa 4 to eFa 5 on a brand-new CentOS 9 stream machine. All went well, but now I see a strange behaviour.

Some E-mails (mostly from t-online.de) are delivered over and over again. On my Exchange 2019 box the mails are recognized as duplicates and don't appear in users mailboxes. Nevertheless the sender will get a "delayed delivery" notification and after some time an "undeliverable" message from his mailserver.

How could I find out what is causing this issue? I tried with "Debug = yes" in MailScanner.conf with no avail.

Regards
Mark

[novyjtop]

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