Mail not going beyond my domain - intermitent

I am getting a severe number of bounced on a known good list (opt in, etc).

The headers of the mail do not contain any receipt information from the domain the email is supposed to go to... That is, there are no receipts by servers other than my own.

Example:

From: Mailer-Daemon@serrano.chilihosting.com
Subject: Mail delivery failed: returning message to sender
Date: July 30, 2004 7:51:56 PM PDT
To: phouse@serrano.chilihosting.com
Return-Path: <>
Envelope-To: phouse@serrano.chilihosting.com
Delivery-Date: Fri, 30 Jul 2004 20:16:34 -0700
Received: from mailnull by serrano.chilihosting.com with local (Exim 4.34) id 1BqjyW-0006Li-Dt for phouse@serrano.chilihosting.com; Fri, 30 Jul 2004 19:51:56 -0700
X-Failed-Recipients: USER_NAME@bellsouth.net
Auto-Submitted: auto-generated
Message-Id: <E1BqjyW-0006Li-Dt@serrano.chilihosting.com>
Status: O
X-Status:
X-Keywords:
X-Uid: 12
Notice there is only one 'Received' Header... there should be at least 2 if the mail is not being delivered to an account on my server.

My initial guess was that if a clients domain sends out a mailing list of say 5000 names and the limit of emails per domain is 1000 per hour, what happens to the remaining 4k?

Do they just collect in the queue or are they abandoned?

It seems to simple a an answer...so I am posting here to at least give my Ded. Co. a lead on the possible problem.

If anyone has any ideas that would be great!

Best,

Toby

 

 

 

 

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