Re: Relaying in MDAEMON.

[Alun Jones <alun () texis com>]

At 02:19 AM 8/17/2001, buggzy wrote:
> As an addition to previous posting: one ISP administrator complains that
> MERAK 2.10.240 SMTP server is also vulnerable to such unauthorized relay. I
> don't test it myself.

Many mail servers are vulnerable to unauthorised relay from people who 
specify a "MAIL FROM" address at the ISP hosting the mail server.  This is 
a frequent source of spam, and can usually be addressed by changing options 
in the mail server, and using such things as SMTP AUTH, and 
POP-before-send, on those connections that are not sourced on the ISP's 
networks.

Alun.
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