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Re: Problems sending e-mail



On Sat, Nov 11, 2000 at 01:52:01PM +0000, Ekkehard Kraemer wrote:

> It seems like you're connecting via T-Online, but want to use your
> university SMTP server to send mails. The SMTP server sees that your
> machine is pD4B9F445.dip.t-dialin.net, but your "From:" is something
> other (whatever mail address you're using). So it assumes that you're a
> spammer or something like that and doesn't accept the mail.

While your suggested solution is correct this explanation is bogus.
Relay controls are generally implemented by looking at the IP address of
the connecting system rather than the headers or the names specified in
SMTP (although it is common to check that the sender domain actually
exists).  Anything else is too simple to forge.

Where relaying from variable IP addresses is used some kind of
authentication (such as POP before SMTP) is needed.

-- 
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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