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Old 12-27-2007, 08:07 AM   #1
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Registered: Dec 2007
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mails out failed!!!!1

Dear forum members, am setting up a web based email system and have managd to configure squirrelmail as the MUA, apache is working properly, imap /pop3 are all doing well.
Sending and recieving messages locally and on the network is working fine for only people with the accounts created eg to
The problem now is any of the above accounts to send mails like to It doesn't work at all!!! plz help me?
I get an errror like ---- the following address had permanent fatal errors-----
(reason:550 Host unknown)

help help!!!!!!!!
Old 12-27-2007, 08:45 AM   #2
Registered: Apr 2005
Location: Fargo, ND
Distribution: Slackware, CentOS
Posts: 87

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First of all what smtp mailer are you using?
Second: it sounds like your /etc/resolv.conf is misconfigured.
what happens when you do a nslookup on
Old 12-28-2007, 01:16 AM   #3
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Registered: Dec 2007
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mails out failed!!!!!!

I dont have any smtp mailer!(clearly what do u mean by smtp mailer), coz am using sendmail. Is it different from that?

Second in the /etc/resolv.conf guess it's not misconfigured? coz when i issue the command i get:
nameserver "ip addresss of the mail server"

Third when i do nslookup yahoo i get:
server: "ipaddress of the mail server"
Address: "ipaddress of the mail server"#53

Non Authoritative Answer

Below is a message that is displayed when i tried to send a mail to my account

The original message was received at Fri, 28 Dec 2007 09:05:56 +0200
from localhost.localdomain []

----- The following addresses had permanent fatal errors -----
(reason: 550 Host unknown)

----- Transcript of session follows -----
550 5.1.2 <>... Host unknown (Name server:"ipaddress of the mail server": host
not found)

NB: Am using Redhat Linux 9.0 as the enviroment,squirrelmail,sendmail,php,apache,pop3/imap4.
Hope this information clarifies properly the problem.


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