Postfix as Receiving mails for Multiple Domains
 

Hi Guys,
I have configured postfix to send/receive mail from/to for two domains we manage. mail.domainX.com and mail.domainY.com
Most of the cases there is no issue sending out or receiving emails. However, a few users of domainY.com complained that their senders were not able to sent them email. after much investigation, we started thinking that the mailserver failed to send us email may the failing on doing a SMTP Banner issue.

Is there anyone who knows how to deal with this SMTP banner issue with multiple domain. We want different SMTP banner when doing EHLO on different server.
530 mail.domainX.com ESMTP MailEnable Service, Version: 1.981-- denied access at 11/16/10 10:51:21

530 mail.domainY.com ESMTP MailEnable Service, Version: 1.981-- denied access at 11/16/10 10:51:21

Or is there any other solution that addresses similar issue?

Thanks for your time..

Zahir

I would want to know the errors that the remote senders see when their email fails.

Thanks for your reply. here is the delivery failure notice attached below...

-----Original Message-----
From: System Administrator
Sent: Saturday, November 13, 2010 2:46 PM
To: user.name@domainY.com
Subject: Undeliverable: RE: Users's email bouncing
Your message did not reach some or all of the intended recipients.
Subject: RE: Users's email bouncing
Sent: 12/11/2010 2:44 PM
The following recipient(s) could not be reached:
user.name@domainy.com on 13/11/2010 3:08 PM
Could not deliver the message in the time limit specified. Please retry or contact your administrator.
< mx01.chw.edu.au #4.4.7>
________________________________________

This says that the email bounced, but it doesn't say why. For example, did it bounce on a temporary error, such as mailbox is full, or did it bounce on a hard error like unknown user? As you have a date and time associated with a failed attempt, look in your own Postfix logs for entries for this user at that date and time. Your logs will show you why the message was rejected.

Thanks guys...
Looks like a different story altogether. Sender is experiencing DNS issue. Got logs from the sender's mail server. I hope issue will be resolved soon.

Nov 12 13:25:33 mx01 sendmail[29863]: oAC2PWDJ029861: to=<User.Name@domainX.com>, delay=00:00:01, xdelay=00:00:01, mailer=esmtp, pri=125603, relay=mail.domainX.com. [1.2.3.4], dsn=2.0.0, stat=Sent (Ok: queued as 48CE828990)
Nov 12 14:23:13 mx01 sendmail[31421]: oAC3NDJr031417: to=<User.Name@domainY.com>, delay=00:00:00, xdelay=00:00:00, mailer=esmtp, pri=141687, relay=domainY.com., dsn=4.0.0, stat=Deferred: Name server: domainY.com.: host name lookup failure
Nov 12 14:36:53 mx01 sendmail[31858]: oAC3NDJr031417: to=<User.Name@domainY.com>, delay=00:13:40, xdelay=00:00:00, mailer=esmtp, pri=231687, relay=domainY.com., dsn=4.0.0, stat=Deferred: Name server: domainY.com.: host name lookup failure
Nov 12 14:51:53 mx01 sendmail[32341]: oAC3NDJr031417: to=<User.Name@domainY.com>, delay=00:28:40, xdelay=00:00:00, mailer=esmtp, pri=321687, relay=domainY.com., dsn=4.0.0, stat=Deferred: Name server: domainY.com.: host name lookup failure
Nov 12 15:05:55 mx01 sendmail[316]: oAC45sFM000314: to=<User.Name@domainY.com>, delay=00:00:01, xdelay=00:00:00, mailer=esmtp, pri=215580, relay=domainY.com., dsn=4.0.0, stat=Deferred: Name server: domainY.com.: host name lookup failure
Nov 12 15:05:57 mx01 sendmail[316]: oAC45sFM000314: to=<UserjName@yahoo.com.au>, delay=00:00:03, xdelay=00:00:02, mailer=esmtp, pri=215580, relay=g.mx.mail.yahoo.com. [98.137.54.238], dsn=2.0.0, stat=Sent (ok dirdel)
Nov 12 15:06:53 mx01 sendmail[344]: oAC45sFM000314: to=<User.Name@domainY.com>, delay=00:00:59, xdelay=00:00:00, mailer=esmtp, pri=305580, relay=domainY.com., dsn=4.0.0, stat=Deferred: Name server: domainY.com.: host name lookup failure
Nov 12 15:06:53 mx01 sendmail[344]: oAC3NDJr031417: to=<User.Name@domainY.com>, delay=00:43:40, xdelay=00:00:00, mailer=esmtp, pri=411687, relay=domainY.com., dsn=4.0.0, stat=Deferred: Name server: domainY.com.: host name lookup failure

It's all good now. The sender's DNS server required clearing the cache. Mail started receiving just fine.
Regards
Zahir