Jonathan Horne wrote:
currently, my email server is just a single box, accepting and sending emails
from and to the internet.  spamassassin and sendmail, and so far, it works
satisfactory.

i would like to change it up, so that i have a pair of servers doing MX from the
internet, which then passes to an internal server for delivery.  if i do that, i
could remove spamassassin from the internal server, and run it on just the 2
external.  all those configurations is really not my issue here... what im
really pondering is how would external servers that are seperate from where the
target mailboxes are, know which addressess are acceptable and which to return a
550?
I did this for our backup MX using qpsmtpd and a plugin I wrote to check against an automatically updated file. qpsmtpd can deliver onwards to any SMTP server after running whatever filtering/fussiness you specify.

I believe there is a milter plugin that can do onward queries before accepting mail, too, although I don't use sendmail, so I couldn't tell you the name of it...
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