singletons

[David Relson]

On Mon, 08 Sep 2003 21:01:45 +0200
Matthias Andree <matthias.andree at gmx.de> wrote:

> 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.

The lexer presently rules include the following:

<INITIAL>^Message-ID:.*				;
<INITIAL>^(Delivery-)?Date:.*			;			
<INITIAL>(ESMTP|SMTP)+[ \t\n]+id\ {ID}		;
<INITIAL>[:blank:]*id\ {ID}			;

The second to last has been changed (fixed) recently and the last is
new.