Re: Some email bounces = misconfigured exim?
On Fri, Apr 16, 1999 at 08:48:01PM -0500, John Hasler wrote:
> Same here. Bizarre, isn't it? What the hell is the point in verifying the
> domain if they are going to believe whatever you tell them?
A reasonable number of mail clients will manage to set the Return-Path:
for users, and quite a few systems can be set up to rewrite it. In
either case, the Return-Path: won't match the originating host. Users
may do this for perfectly legitimate reasons (eg, their laptop mail
client is set up with the office e-mail address even when they take it
home and use an ISP).
You can also find that mail will be queued by a server that doesn't come
from the same domain as the message sender (eg, an ISP providing an
outgoing mail relay for leased line customers or an off-site MX for your
system).
In contrast, a large proportion of the bogus domains used by spammers
don't exist at all. Rejecting nonexistant domains will catch them, but
not interfere with any of the above cases.
--
Mark Brown mailto:broonie@tardis.ed.ac.uk (Trying to avoid grumpiness)
http://www.tardis.ed.ac.uk/~broonie/
EUFS http://www.eusa.ed.ac.uk/societies/filmsoc/
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