I have installed ISPConfig 2.2.11 . It seems that the .forward function does not work. I also do not see errors in /var/log/mail.err The .forward is as follows (and as expected): "|/usr/bin/procmail -f-", email@example.com I'm hosting another domain where this same user is forwarded to this particular account. Maybe it's because it's on the same ISPConfig server, but the .forward for that account points to firstname.lastname@example.org Update: the forward from the secondary account to the primary account (and then to the external account) also does not work. Any ideas what may be the problem?