I am a longtime sendmail sysadmin who has seen the writing on the wall.
I have been persuaded to learn Postfix.
I have 2 rented servers: one running sendmail (for a while, works fine)
and the other running Postfix (going through the learning curve)/./
My VPS provider (1and1.com) gives me the ability to control my *inbound*
firewall. However, the problem is that a command like this is blocked:
% telnet any-host-other-than-localhost 25
Somehow, sendmail is able to bypass that limitation (out of the box, no
special configuration), but Postfix cannot. The messages stay in the
queue and eventually bounce.
TIA
