ISP customers e-mails being rejected by other providers...

[turbomike]

I work for a small ISP, and it appears as though some of our users e-mail are being blocked by other providers. This blocking is not being caused by RBL's or domain/IP-based blocking as far as I can tell. Below is a copy of the error message our customers are receiving from other providers:

----- Original Message -----
From: &quot;Mail Delivery Subsystem&quot; <mailer-daemon@our.isp.net>
To: <someone@somewhere.net>
Sent: Monday, December 08, 2003 8:36 PM
Subject: Returned mail: delivery problems encountered


> A message (from <someone@somewhere.net>) was received at 9 Dec 2003 3:36:25
+0000.
>
> The following addresses had delivery problems:
>
> <someone.else@another.isp.com>
> Permanent Failure: Other address status
> Delivery last attempted at Tue, 9 Dec 2003 03:36:27 -0000
>

Any thoughts?

 

[RhythmAce]

It's hard to say without more information. You may get more details from your mail log. Try looking in /var/log/maillog.