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Got a strange behaviour
1) Getting mails from specific customer domain abc.com)
2) Specific sender firstname.lastname@example.org has sent mails but same are not received by us.
3) When i check the archive (saviour tool :-)) this mail is available on specific data/time as per sender and is retrieved
4) But this mail is not even in SMTP logs as per original sender date/time
5) what could have caused this mail not delivered / downloaded