From: "Geo" 

When you say "these two addresses" are you talking about
addresses you are sending from or addresses you are sending to? If it's a
TO address, it's possible the server is set to check and see if the TO
domain exists before accepting the outgoing emails. If that's the case just
turn that filter off.

Geo.

"Glenn Meadows"  wrote in message
news:42a8fe03$1{at}w3.nls.net...
> That one I can answer for him.
>
> Clients are in NYC, on a DSL connection, firewalled/nat connected.  Mail
> server is in Texas at Rackspace, hosted on a co-lo machine.  What I don't
> remember, but I think is correct, is that these 2 addresses are part of a
> mail list, and the other ones send correctly.  I could be wrong, and it
> could be just a 2 email address list.
>
> The pop before send could be an issue, but that would go away if you
> re-attempted to send right after the last retrieve of mail, so the timeout
> would have been reset.
>
> --
>
> Glenn M.

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