Some times the postfix/smpt daemon goes crazy and i dont know what is the problem. This happens since i upgraded to the last version. i can see a lot of "/usr/bin/procmail -f-" and "local -t unix" procs running, and email stops working for some users. Any idea? Using Ubuntu 5.1. and ispconfig 2.2.3 ps ax output is an attachment.
Are you receieving or sending a lot of email at the time? Check your mailqueue with the command: "mailq"
Either you send a lot aof mails, or you receive a high number of emails, e.g. from spammers. Have a look at you mail.log and post an exerpt of the mail.log to the forum when this happens again.