HEADS-UP: MIME_NO_TEXT matches Sendmail MIME DSNs

[Bill Cole]

This is true for 8.14.7 in FreeBSD 8.4-RELEASE-p27 (a.k.a. "Update your 
damn boxes, Bill!") and I see nothing in later release notes indicating 
a relevant change in Sendmail, which is formally within spec by putting 
no MIME headers in the human-readable first part of a DSN (Seriously, 
all MIME headers are formally optional... text/plain charset=us-ascii is 
default). If, like me, you have a bunch of old machines that 
occasionally generate mail that is required/forced to use local sendmail 
submission, which is configured to send bounces for just about anything 
to some elsewhere that actually gets read, this matters.

Since MIME_NO_TEXT is pegged to its limit in the current ruleset (1.999) 
there's likely a lot of backscatter out of Sendmail feeding the score, 
making it harder for me to form an opinion on the right sort of global 
fix, if one exists.

(I'll probably write a bug on this when my brain has rested adequately 
to do so cogently, can't say when that might be.)