Dear Exim-People,indeed I am quite sure the reverse DNS lookup was done by the reverse_host_lookup in ACL acl_smtp_mail.
Not only sure, the log shows its away.May be it is a bad place to call an reverse lookup when at this check mails can come from 127.0.0.1? But the test was not mandatory, it was redundant. I removed it because a reverse lookup check is done much more earlier on the real IP. I was not aware this is doubled with second test totally useless. Fine.
The connection timeout I pointed out happening then is caused by the clamav daemon which amavis is calling. It is very flaky and semi-dies sometimes. I am actually debugging this and check what this has to do with the localhost availability in nameservers. But it is very flaky in my install ATM...
Also, I temporarily removed clamav from my amavis, the 4min startup to operational delay is away. It was clamav deploying its socket after this long time and not immediatley. May be it takes so long.
So exim is out, everything is fine with it :) Kind regards Konstantin
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