Thanks, Ben.  I'll take a look at it.
________________________________________
From: LISTSERV site administrators' forum [[log in to unmask]] on behalf of Ben Parker [[log in to unmask]]
Sent: Friday, February 15, 2013 11:38 AM
To: [log in to unmask]
Subject: Re: Strange Delivery Delays

On Thu, 14 Feb 2013 13:19:50 -0500, [log in to unmask] wrote:

>Is there any chance you could build a small Linux/FreeBSD box running
>sendmail or Postfix for a mail relay?  It sounds like you're relaying
>through your production Exchange server, which is fine for low volumes.
>Maybe not so good for the load you've described.

Since this is Windows, I would first consider installing/using the IIS SMTPSVC
mailer that is part of Windows on the LISTSERV machine and use that for
outgoing mail, completly bypassing the issues with your Exchange server. There
is a paper on how to do this:

 Using the Microsoft IIS SMTP Service for LISTSERV Deliveries
 http://www.lsoft.com/resources/whitepaper-download.asp?id=209

You may need to make some firewall and/or DNS changes (any machine used as a
sending mail server needs proper A and PTR records) for this to work properly
but it may be the fastest/easiest solution.

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