Good morning, I got a problem with postfix, the service is running on Centos 6 with an installation of ISPConfig. Tailing the mail log I realised that every N seconds I receive the following lines: Code: Jan 29 12:38:58 mail postfix/local[3228]: fatal: main.cf configuration error: mailbox_size_limit is smaller than message_size_limit Jan 29 12:38:59 mail postfix/master[1229]: warning: process /usr/libexec/postfix/local pid 3228 exit status 1 Jan 29 12:38:59 mail postfix/master[1229]: warning: /usr/libexec/postfix/local: bad command startup -- throttling My email addresses configured within the server apparently are not able to send emails and I suppose it's because of the lines above. I also realised that there was some sort of open relay within the configuration so I found the solution of removing the mail queue and set main.cf file with mynetworks to 127.0.0.0/8, not sure if that's enough. Any idea on the postfix error?