I'm having trouble getting postfix to accept connections on port 25 (on CentOS 5).

My server hostname is different from the main.cf setting, but the hostname I have set for main.cf is working in DNS both forward and reverse (mail.spaceageliving.com). Is this a potential problem?

# /usr/sbin/postconf -n
alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
command_directory = /usr/sbin
config_directory = /etc/postfix
daemon_directory = /usr/libexec/postfix
debug_peer_level = 2
html_directory = no
inet_interfaces = $myhostname, localhost
mail_owner = postfix
mailq_path = /usr/bin/mailq.postfix
manpage_directory = /usr/share/man
mydestination = $myhostname, localhost.$mydomain, localhost
myhostname = mail.spaceageliving.com
myorigin = $mydomain
newaliases_path = /usr/bin/newaliases.postfix
queue_directory = /var/spool/postfix
readme_directory = /usr/share/doc/postfix-2.3.3/README_FILES
sample_directory = /usr/share/doc/postfix-2.3.3/samples
sendmail_path = /usr/sbin/sendmail.postfix
setgid_group = postdrop
unknown_local_recipient_reject_code = 550

# netstat -nalp | grep :25
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 4774/master

netstat shows that you're only listening for internal connections. if you want to accept external connections, you should change the value of inet_interfaces.

So beyond these two settings:

myhostname = mail.spaceageliving.com
inet_interfaces = $myhostname, localhost

what else is required?

I would set inet_interfaces = all You need to restart postfix after that -- reloading isn't good enough. If that doesn't work, maybe there's something in master.cf that's restricting the IP/port.

OK, thanks a lot--I was using reload...after doing a hard stop/start, netstat is now showing master listening on port 25 for my IP address.

Onward...

Excellent.