Ryan C. Gordon e15d11df18 Added an API to ask if an incoming email should be dropped at the SMTP level.
This lets an SMTP server optionally decide if it should reject a mail without
passing it on to Discourse at all, possibly before even reading the
email's payload, to prevent spam-induced backscatter and save resources.

This just does the bare minimum sanity checking that could prevent obvious
backscatter. For legit errors from legit users, Discourse will still send a
much more pleasant reply email.
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