Go Back   HowtoForge Forums | HowtoForge - Linux Howtos and Tutorials > Linux Forums > Server Operation

Do you like HowtoForge? Please consider supporting us by becoming a subscriber.
Thread Tools Display Modes
Old 7th March 2008, 19:55
can can is offline
Junior Member
Join Date: Mar 2008
Posts: 7
Thanks: 1
Thanked 0 Times in 0 Posts
Thumbs down Problem with new CENTOS 5.1 / POSTFIX installation

I am new to LINUX administration and even newer to POSTFIX installation and administration. However, I have jumped into it with the intent of setting up my own mail server behind a firewall appliance. I am a convert from SBS 2003 and a new fan of this OS. However, my best efforts at configuring POSTFIX have so far failed and I am unable to send or recieve email.

So, I turned to the excellent troubleshooting chapter (25) that is part of "The Book of Postfix" (see http://www.postfix-book.com/debugging.html). It provides great help and I have passed all of its recommended configuration tests, except one - attempts to ping to the outside world fail. If I ping to another machine behind the firewall (from within my net), all is fine as one would expect.

I am running CENTOS 5.1 with POSTFIX 2.3.3 with an internal IP address of behind a NETGEAR FVS318 firewall appliance. The firewall distributes from a static IP of 74.XX.XXX.XX as provided by COMCAST. The firewall has ports 25 and 110 open for the internal .13 machine. In addition, the foward and reverse DNS are set up properly (as confirmed with nslookup). NSLOOKUP returns mail.mydomain.com and my external IP address 74.XX.XXX.XX. NSLOOKUP returns 74.XX.XXX.XX and mail.mydomain.com

In another check, I can telnet to "localhost 25" and to "mail.mydomain.com 25" where mydomain.com is our actual domain name as managed by network solutions. I can even telnet to relay-test.mail-abuse.org as another sucessful check.

Finally, I try to email to the mail server from a client with the sample address:
"user@machine.domain.com but the mail is rejected as " reason 554 5.7.1 <user@machine.domain.com>: Relay access denied. Other messages include 554 5.0.0 Service unavailable, and 554 5.5.1 Error: no valid recipients.

When I try to send something out from the mail server, nothing happens and the mail stays in the outbox.

Any assistance would be much appreciated. Thanks!
Reply With Quote
Sponsored Links
Old 8th March 2008, 00:10
can can is offline
Junior Member
Join Date: Mar 2008
Posts: 7
Thanks: 1
Thanked 0 Times in 0 Posts
Smile Up and running

I am up and running... Please disregard my previous request for help.
Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Ubuntu / Postfix problem - [newbie] barney.parker Server Operation 6 7th November 2007 14:44
Postfix: connection refused error tosin Server Operation 1 30th October 2007 18:30
postfix + dovecot + postfixadmin - problem with quota kosta Server Operation 3 24th August 2007 23:08
Problem with install PostFix - Pls Help! joelee HOWTO-Related Questions 3 28th July 2007 11:23
Problem installing on CentOS 4.2 bokko Installation/Configuration 4 1st March 2006 18:14

All times are GMT +2. The time now is 18:27.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.