Sending with Postfix: connection refused
I've just setup a mail server in Centos 5.5 following these guides:
wiki . centos . org/ HowTos/ postfix
wiki . centos . org/ HowTos/ postfix_sasl
The server is running on a static IP provided by my ISP, who also created a reverse DNS entry for me.
I can recieve mail and send mail to myself, however if I try to send to other domains my connection is refused. I've tried my ISP (who use pos tini filte ring) g ma il and h ot mail.
Some log entries:
Jun 25 15:31:30 slotin postfix/smtp18731: 6204240062: to=my_emailATmy_isp, relay=none, delay=0_44, delays=0_16/0_01/0_28/0, dsn=4_4_1, status=deferred (connect to my_isp_mail8_psmtp_com64_18_5_14: Connection refused)
Note: I had to strip out anything url-like, or spam 15 superfluous posts to get the logs on here, so pretend those underscores are periods and all the proper square brackets and greater than or less than are in there.
I don't think it's a firewall thing because if I telnet directly to my ISP's mail server it works fine.
# telnet mail.my.isp 25
Connected to mail.my.isp (*.*.*.*).
Escape character is '^]'.
220 mailout2.my.isp ESMTP Postfix