From: Marcus Reid (marcusblazingdot.com)
Date: Tue Jul 01 2003 - 17:42:38 CDT

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Hello,

I'm finding recipient address verification very useful.
However, there's a couple of things that I would like to
do a little differently when setting this up for a larger
site.

If the destination mail server is down, the incoming message
will be deferred with a 450. This defeats the point of being
a backup MX for domains. I'd like to be able to reject email
to invalid recipients, but if the verification times out
(after 9 seconds or whatever,) I would like to accept the mail
into the queue instead of deferring it.

Also, it seems bad to cache failed verifications. If an account
is added to the destination server, the MX will still reject
mail with a 550. Caching positives is good, because if the
account is deleted later all that happens is a bounce is
generated down the line.

Marcus

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