We've got an annoying insurance carrier that staff uses who sends emails
with a valid reply-to and from in the header along with a completely blank,
but there, SENDER header.

TO: u...@charity.org
FROM: membersupp...@insurancecarrier.com
SENDER:
SUBJECT: Claim documents

This triggers invalid from and does some high scoring.  There's no way the
insurance carrier can get me to their IT, so I've got to live with this.  I
really like the high scoring for invalid from, that's usually scammers, but
with this one, it's just catching their lousy claims emailing system.

I've seen this happen before, as one offs, but this is dozens of messages a
month like this from the insurer.

Might it make sense in general to change ASSP to only evaluate header
fields that contain something other than spaces after the colon? I assume
that the RFC makes sender: (followed by nothing) invalid syntax, but it
appears that some automated systems are doing just that that.

FROM empty  + SENDER empty would still be cause for scoring, but an empty
header line (with only the field name: but nothing else after it), could
simply be ignored.

What do you think?

Thanks
ken
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