singletons

[Matthias Andree]

David Relson <relson at osagesoftware.com> writes:

> I've noticed that one big source of singletons is message IDs. 

The simple way to get rid of them is to drop (Resent-)?Message-ID:,
In-Reply-To: and References: headers. We're only discarding Message-ID:
ATM.

OTOH, looking at my data base, the header name itself appears to be
indicative of non-spam, so we might want to discard the value, but still
emit the header name.

-- 
Matthias Andree

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