>Please remember that Blat or IMail1 would execute 50K times.

Yes, hardly anyway to run a mailer.  But 50K isn't very much at all, 
compared to the mailing output of a Pentium 200.  So I don't think it 
will be a pb.  And if you're careful how you build the app, you can 
isolate the sending section so that it could be replaced with another 
SMTP client.

Commercail ASPmail and ASPQmail from serverobjects.com and free Jmail 
from dimac.net alternatives if you can develop COM apps.

>a mid-scale server (say a 500 MHz Pentium with 256 MB
>RAM?) will handle the job within 1 to 2 hours.

yes, overkill.  You would go faster by upping to 512 megs, not by 
faster CPU or dual CPU.

One issue is the envelope header "mail from: 
sender@senderdomain".  The sender mailbox will receive the inevitable 
bounces, maybe 100's from a list of 50K.  Who's going to handle them?

And the @senderdomain needs A and MX records in DNS to avoid rejection by
by picky remote servers like ..... IMGate.

Len

http://BIND8NT.MEIway.com : Binary for ISC BIND 8.2.3 for NT4 & W2K
http://IMGate.MEIway.com  : Build free, hi-perf, anti-spam mail gateways


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