> You need to figure out which service is connection denied on localhost. > See also http://www.postfix.org/DEBUG_README.html#logging
Thank you! I run egrep '(warning|error|fatal|panic):' /var/log/mail | less. I got a filtered list that looks like this: Sep 17 18:40:04 mail postfix/smtpd[416]: warning: Connection rate limit exceeded: 4 from 200-35-105-243.static.telcel.net.ve[200.35.105.243] for service smtp Sep 17 18:40:12 mail postfix/smtpd[421]: warning: 189.81.37.241: hostname 18981037241.user.veloxzone.com.br verification failed: Name or service not known Sep 17 18:40:23 mail postfix/smtpd[31742]: warning: Connection rate limit exceeded: 5 from 200-35-105-243.static.telcel.net.ve[200.35.105.243] for service smtp Sep 17 18:41:09 mail postfix/smtpd[27472]: warning: 200.127.126.7: hostname 200-127-126-7.static.cab.prima.net.ar verification failed: Name or service not known Sep 17 18:41:25 mail postfix/smtpd[31784]: warning: 79.165.181.178: hostname host-79-165-181-178.qwerty.ru verification failed: Name or service not known Sep 17 18:41:31 mail postfix/smtpd[414]: warning: 91.78.220.169: hostname ppp91-78-220-169.pppoe.mtu-net.ru verification failed: Name or service not known Sep 17 18:41:33 mail postfix/smtpd[491]: warning: 189.89.146.206: hostname 189-89-146-206.static.itsweb.com.br verification failed: Name or service not known The lines "Connection rate limit exceeded:" are probably the result of the only remedy I did so far: I entered smtpd_client_connection_rate_limit = 2 into Postfix's main.cf. -- Milos Prudek
