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From Dianne Skoll <...@roaringpenguin.com>
Subject Re: Test for empty EnvelopeFrom
Date Thu, 24 Sep 2015 14:02:02 GMT
On Thu, 24 Sep 2015 12:21:33 +0000
David Jones <djones@ena.com> wrote:

> I agree with Reindl.  You can't block null senders or you break a lot
> of legit emails.

Well, if you run your own mail server, you can do whatever you like so
long as you accept the consequences.

I would say: A null sender is not necessarily the sign of spam, but it's
also not necessarily the sign of ham.  We see a continuous background
chatter of spam messages that have a null envelope sender.  And these
are new messages, not backscatter in response to anything.

What *is* a very reliable spam indicator (and is a SpamAssassin rule
DSN_NO_MIMEVERSION) is mail from a null sender that lacks a
MIME-Version: header.  Almost all auto-generated responses have that
header; a fair bit of null-sender spam does not.

Regards,

Dianne.

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