I did a migration yesterday and checked already the IP address for possible blacklistings ... the IP address is clean
but it seems there is a cisco router blacklisting from Talos which need some time to be fixed by the datacenter ...
https://talosintelligence.com/reputation_center
My old system from which I have migrated is still running, would it be possible to route only all outgoing mails to this server and incoming to this until the problem is solved?
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problem solved by datacenter