DFS wrote on 01/18/2006 10:41:06 AM:

> It depends on the MTA.  I believe Sendmail is smart enough to notice 
that
> both MX hosts have the same IP address, and send the mail over one SMTP
> session.

I sort of expected that to be the case.  That's why I asked the follow up 
question.

> Well, the downsides are you'd use up 50 or more IP addresses (which
> may or may not be a concern for you), and you'd use more bandwidth.
> If you're a very large site, you'd probably annoy people who send mail
> to lots of your domains (though most of those people are spammers
> anyway.)

I'll have to see if I can get away with that.  I'm not that concerned with 
the bandwidth.  Much of the spam comes in over night when our BFPs (Big 
Fat Pipes) are idle.
 
> As a means of avoiding stream_by_domain, it's a good idea.

That's what I want to do.  I hate the idea of accepting mail and then 
remailing it and creating the bounce if it is spam.  I'd much rather issue 
the tempfail to someone else's server.

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