Dean,
I just had pretty good luck sending to a list with about 1130 addresses.
I did get an error about two-thirds of the way through, but I waited about three minutes or so and resumed.
The error this time was...
Sending Error. Check your mail settings
Server said"
250 2.1.5 ... Recipient Ok
Strange.
Concerning your offer - if I continue to have trouble, I'll let you know. For my next e-mail, maybe I'll give you a shout to pre-plan timing for the send out and for you to log in and check stuff.
Steve