I am a web-developer who built a server for a client a couple of years ago but have no previous or ongoing linux experience. I have full access to their server and configuration - but very little experience in linux / server configuration, so clear helpful advice and troubleshooting help would be gratefully received. Thanks in advance!
My client is able to receive mails fine but when they try to send a mail from their webmail it fails when the recipient is anyone (except for their own email account which receives the mail fine. I set up squirrelmail for them on their server and that is what they use.
They didn't have a problem sending mail from their squirrelmail webmail system until I upgraded their server recently from the previous incarnation (gutsy gibbon). The error email received (with domain xx'd out but all characters crossed out are alphabetical) :
Returned mail: see transcript for details
The original message was received at Tue, 23 Mar 2010 11:08:59 GMT
from localhost [127.0.0.1]
----- The following addresses had permanent fatal errors -----
(reason: 501 Syntactically invalid HELO argument(s))
----- Transcript of session follows -----
... while talking to xxxxxxx.com.:
>>> HELO ;; connection timed out; no servers could be reached
<<< 501 Syntactically invalid HELO argument(s)
554 5.0.0 Service unavailable
Received: from localhost (localhost)
by ;; connection timed out; no servers could be reached (8.14.1/8.14.1/Debian-8ubuntu1) id o2NB90LC016868;
Tue, 23 Mar 2010 11:09:00 GMT
Date: Tue, 23 Mar 2010 11:09:00 GMT
From: Mail Delivery Subsystem <MAILER-DAEMON>
Message-Id: <201003231109.o2NB90LC016868@;; connection timed out; no servers could be reached>
Content-Type: multipart/report; report-type=delivery-status;
boundary="o2NB90LC016868.1269342540/;; connection timed out; no servers could be reached"
Subject: Returned mail: see transcript for details
Auto-Submitted: auto-generated (failure)