I have a problem with e-mails sent to a particular domain (alice.it). Usually the mail is corrected sent and in my postfix log I have this:
06104180AF: to=<**********@alice.it>, relay=mx.tim.it[34.141.161.132]:25, delay=200, delays=0/200/0.14/0.12, dsn=2.0.0, status=sent (250 <62CC171918270D1E> Mail accepted)
But sometimes, the mails are not sent and in the logs I receive this error:
11F7817D05: to=<**********@alice.it>, relay=none, delay=59, delays=0/59/0/0, dsn=4.0.0, status=deferred (delivery temporarily suspended: host mx.tim.it[34.141.161.132] refused to talk to me: 421 mta-in-01.tim.it Service not available - too busy)
The difference is in the field "relay" that in the first case is "mx.tim.it". In the second is "none".
Also in my postfix configuration, inside the file /etc/main.cf i have:
transport_maps = hash:/etc/postfix/rl_transport
And in /etc/postfix/rl_transport, I have:
alice.it slowest:
In the /etc/postfix/master.cf I have:
slowest unix - - n - - smtp -o syslog_name=postfix-slowest
So, all the mail to alice.it domaini sould be tagged with "postfix-slowest", but the ones that have "relay=none" are tagged with "postfix". The others (the ones with relay=mx.tim.it") instead are correctly tagged with "postfix-slowest".
How is it possible?
There is something that I can do, or is a problem of the receiver (alice.it)?
Thanks a lot
Stefano
