451 Could not complete sender verify callout
 

Hey guys,

I'm learning linux via CBTs, etc. and have a box on my home network running CentOS 4.4

Long story short... I'm using DynDNS since my cable modem IP is not static. I have a VPS at a web hosting company where I've set up a DNS zone for my box. I am able to http:// to my server using my server name, and I can SSH to it as well. I have the basics configured in the firewall.

You may need more info to help, but not sure what you may need, so I'll start off with the problem.

I can't get mail to send out or receive in. At this point, I'm more concerned with getting mail to send out (so I can get my logs emailed to me, etc..)

Tried both sendmail and postfix and I get the same error with both when I try to send mail out to an external email address (from the root account, using Pine for example)

( I'm replacing real info with <name.myserver.com>, etc..)

This is the error:


--------------
6BB3C7CA77 587 Tue Mar 6 17:10:31 root@<name.myserver.com>
(host theexternaldomain.com[66.x.xxx.xxx] said: 451 Could not complete sender verify callout (in reply to RCPT TO command))
name@theexternaldomain.com
--------------

I can see this when I type mailq. I switched over to postfix, but I was getting the same error even with sendmail.


It sounds like the external server is trying to verify something on this end in order to accept the message, but I don't know what to do here. Maybe the external server is confused because of the DynDNS stuff?


Any ideas?


Thanks
Nat

solved!
 

I just love solving my own problems :)


In case anyone else comes across this problem, I edited /etc/postfix/main.cf and set:

inet_interfaces = all

(default was = localhost)


and restarted postfix and it started working! Yay.. now I can get notified of my denyhosts messages immediately!


(haven't tested receiving mail yet.. another project probably)


Nat