Re: [Exim] only accept local users (for seval networks)

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Autor: Philip Hazel
Datum:  
To: Oliver Egginger
CC: exim-users
Betreff: Re: [Exim] only accept local users (for seval networks)
On Wed, 7 Nov 2001, Oliver Egginger wrote:

> I wanna configure exim (3.33) (for serval networks) to only accept
> SMTP-conections if the sender is a local one, without having
> a SMTP-Auth(!).


If by "sender" you mean "envelope sender" you have two problems:

1. Senders are trivially forged.

2. You are required always to accept the sender "<>" because that's what
bounce messages have.

Basically, trying to control input by envelope sender is a bad idea.
That's why AUTH was invented.

-- 
Philip Hazel            University of Cambridge Computing Service,
ph10@???      Cambridge, England. Phone: +44 1223 334714.