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Old 03-06-2007, 05:32 PM   #1
Registered: Mar 2006
Posts: 66

Rep: Reputation: 15
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 <>, etc..)

This is the error:

6BB3C7CA77 587 Tue Mar 6 17:10:31 root@<>
(host[] said: 451 Could not complete sender verify callout (in reply to RCPT TO command))

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?

Old 03-06-2007, 08:47 PM   #2
Registered: Mar 2006
Posts: 66

Original Poster
Rep: Reputation: 15
Smile solved!

I just love solving my own problems

In case anyone else comes across this problem, I edited /etc/postfix/ 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)



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