Although [EMAIL PROTECTED] doesn't exist, the milter is still passed it, and it is NOT told by Sendmail that delivery will fail. Normally, this isn't a big deal, but if you're streaming by recipient, it is a big deal.
Ah. Got it.
We only use stream_by_recipient in limited cases, which explains why I haven't seen the problem.
The only workaround is to (also) validate recipients in filter_recipient, because if *that* function rejects a recipient, then MIMEDefang is smart enough not to add it to @Recipients by the time filter_begin is invoked.
Must file this away for future reference....
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