Mail Error - invalid/host-not-in-DNS

[flashweb]

Hi,

I get following error when sending mail from PHP script and web mail. I can send mails using OutLook and that works fine.

In WHM Mail Delivery Stats
----------------------------------

1 flashweb@asianetonline.net R=lookuphost T=remote_smtp:
SMTP error from remote mailer after MAIL FROM:
SIZE=2120: host ekm.asianetonline.net [202.88.231.5]:
550 5.1.8 invalid/host-not-in-DNS return address not allowed

Returned Mails
------------------

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es)
failed:

flashweb@asiaXXXXline.net
SMTP error from remote mailer after MAIL
FROM:<nobody@server2.hosthat.com> SIZE=1378:
host ekm.asiaXXXXline.net [202.88.231.5]: 550 5.1.8
invalid/host-not-in-DNS return address not allowed

------ This is a copy of the message, including all the headers. ------

Return-path: <nobody@server2.hosthat.com>
Received: from nobody by server2.hosthat.com with local (Exim 3.36 #1)
id 19Bq1R-0004yP-00
for flashweb@asiaXXXXline.net; Sat, 03 May 2003 01:57:21 -0400
To: flashweb@asianetonline.net
Subject: hi from new server
From: info@biXXat.com
Message-Id: <E19Bq1R-0004yP-00@server2.hosthat.com>
Date: Sat, 03 May 2003 01:57:21 -0400

hi from new server

==============================

Can any one help ?

Regards,

Yujin

[flashweb]

Another error i got.

SMTP error from remote mailer after end of data:
host fxxxxxxt.com [xxx.xxx.xxx.xx]: 550 rejected:
cannot route to sender <nobody@server2.hosthat.com>

Is this happen because there is no real host name (server2.hosthat.com) ?

Regards,

Yujin

[sexy_guy]

Join the club!

[flashweb]

Thanks

-----
SMTP error from remote mailer after MAIL FROM:<root@server2.hosthat.com> SIZE=1668:
host ekm.asianetonline.net [202.88.231.5]: 550 5.1.8 invalid/host-not-in-DNS return address not allowed

[howard]

Originally posted by flashweb
Is this happen because there is no real host name (server2.hosthat.com) ?

Yes you *NEED* to have a vaild hostname in whatever you send in MAIL FROM: (which may or may not maybe the same as in the From: field as those are completly seperate things) or else your mail will be rejected by alot of servers

If you have your servers hostname in the MAIL FROM: field (like you have) then ideally you should also have your reverse dns properly setup to point back to that hostname or else some pedantic servers might reject you for not having proper forward/reverse dns mapping (doing this is debatable though since it can cut out a large amount of otherwise legitmate mail)

[flashweb]

Thanks howard for the reply.

I changed host name with one with A record and it start working.

Hope adding an "A" Record to server2.hosthat.com will be ok.

Regards,

Yujin

[howard]

yep that would be fine (most mail servers do it really just to catch common typos / and to prevent people frm randomly making up addresses such as a dhusdhusd@xjnushux to evade blocks etc )