[imp] [patch] Configurable Received: header behavior

[Brian Keifer]

Hi, All.

I've been seeing some people mentioning that they have issues with spam filters
seeing their dial-up or otherwise dynamic IP in the Received headers and
thinking the messages are originating from a mail server in dynamic space.
I've been bitten by this as well recently, so I wanted to do something about
it, if only for my own server.

The attached file is a diff against imp-h3-4.0.2-rc1.  It adds an admin-level
config option (on by default) to enable or disable adding the first received
header.  I wanted to toss this out as a suggestion, mainly to see if the core
folks had any strong feelings either way on it.

I've checked out a couple of webmail services (Yahoo!, Hotmail, Gmail, and a
couple of local ISPs) and so far, Gmail's the only one that doesn't include the
sending workstation's IP address in a Received: header.

If it's dubbed fit for inclusion, I'll be happy to re-roll a patch against HEAD,
but as you can see, it's a fairly simple one. =)

-Brian

-- 
"What exactly is 'viewer discretion'?  If viewers had discretion, most
television shows would not be on the air."
--George Carlin
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