Hello, I configured a dedi with ispconfig 3. All is working, mx record too. squirrelmail is installed, I can log in, but when I tried to send message i got error Hmm, I used this http://www.howtoforge.com/perfect-server-debian-wheezy-nginx-bind-dovecot-ispconfig-3
Commenting out -o smtpd_client_restrictions=permit_sasl_authenticated,reject for submission and smtps solved this issue for me. but im not sure, it's secure?
Seems a sif there is a misconfiguration in your postfix master.cf if you had to do this. Please post the complete master.cf file or compare it again line by line with the file from perfect setup. I'am pretty sure that you missed to remove the # in front of the line that starts with "smtps" and the line that starts with "submission".
