Re: Sender header?

[Stainless Steel Rat <ratinox@peorth.gweep.net>]

* Harry Putnam <reader@newsguy.com>  on Thu, 24 May 2001
| From what I'm seeing on this thread, the router which has my static IP
| address is what the sender would be derived from, however it cannot
| recieve mail for that address, only for either my IP domain or newsguy

Somewhere in this you should have your MTA (or plural) masqerade outgoing
headers so that anyone on the outside of your firewall sees nothing that
points to anything inside your firewall.  This is easiest to manage if you
have one mail gate and everything behind the firewall uses it as the smart
host.

| I'd be interested to hear Rats or others views of what I should be doing
| regarding From and sender.  (Message-ID would be a bonus).

>From should be reader@newsguy.com.  Sender should start out being something
appropriate for the sending machine inside your firewall, and be masqeraded
(and possibly rewritten entirely) by your mail gate with your One True FQDN
associated with your single IP address.

Message-ID strings can be simpler or harder, depending on how militant one
is.  The one absolute requirement is that any given message's Message-ID be
unique.  Usually the easiest way to accomplish this is to hash/mash login,
FQDN and time stamp.  You might be better off telling Gnus not to generate
Message-ID strings either, and let your mail gate handle it.
-- 
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