SOLVED RE: IPv6 enabled sendmail does not send to domains with IPv4 only MX which results in “config error: mail loops back to me”

Thorsten thorsten23 at
Fri Dec 14 14:05:58 UTC 2018

It wasn't a sendmail problem:

My hostname was with with domain "" not just "hostname" so the resolver in search for the non-existent AAAA of returned which resolved to my local IPv6 address and sendmail tried to send the mail to itself.

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