More and more internet access providers are closing port 25 to reduce spam except for connections to their own mailservers. If you run your own mailserver and have problems to connect to it on port 25, you can enable port 465 (smtps) in postfix as a workaround. Edit the /etc/postfix/master.cf file:

vi /etc/postfix/master.cf

and remove the # in front of the smtps line. Example for Debain 5, change the line:

#smtps     inet  n       -       -       -       -       smtpd

to:

smtps     inet  n       -       -       -       -       smtpd

and restart postfix:

/etc/init.d/postfix restart

This articles describes the renewal of SSL certificates for courier pop3 and imap server. This is nescessary e.g. when the certificates are expired or contain the wrong hostname.

First delete the exsiting certificates:

rm -f /etc/courier/imapd.pem
rm -f /etc/courier/pop3d.pem

Then edit the template that contains the details for the ecrtificates so that the hostname in the certificate matches the hsotanme of your server and that the email address matches your postmaster email address:

vi /etc/courier/imapd.cnf
vi /etc/courier/pop3d.cnf

and create the new certificates:

mkimapdcert
mkpop3dcert

Courier pop3 and imap have to be restarted so they pick up the new ecrtificates:

/etc/init.d/courier-imap-ssl restart
/etc/init.d/courier-pop-ssl restart

Please check if the domain of the users that receives all emails is the same as the domain $mydomain in /etc/postfix/main.cf. If this is the case, change $mydomain and run

postfix reload

on the shell.

You should never enter a domain that is used for a virtual site on the server as $mydomain in /etc/postfix/main.cf!

ISPConfig 3 uses ClamAV (http://www.clamav.net) as virus scanner and spamassassin as spam scanner. Amavisd-new is used as content filter.

ISPConfig 2 uses ClamAV (http://www.clamav.net) as virus scanner and the E-mail Sanitizer (http://www.impsec.org/email-tools/procmail-security.html) as content filter.