From: Jens Hoja (newsletterdweb-data.de)
Date: Sat Apr 26 2003 - 06:08:55 CDT

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Hello Carsten,
you can prohibit sending mail of roaming user by pop-before-smtp
(http://www.google.de/search?q=pop+before+smtp+%2B+sendmail&ie=UTF-8&oe=UTF-
8&hl=de&meta=)

Smtp has no authentication mechanism, but pop has. after configured
pop-before-smtp with sendmail only users with authenticated by pop first are
allowed to send email through your mailserver.
Jens

-----Ursprüngliche Nachricht-----
Von: Carsten Becher [mailto:cb-maillist@cbecher.de]
Gesendet: Samstag, 26. April 2003 10:57
An: SuSE Security
Betreff: [suse-security] sendmail, avoiding open relay

Hoi !

I´ve a mailserver running at home (for 2 clients - nothing serious),
SuSE 7.2. I´ve already restrictet access by using the /etc/mail/access
to 192.168 . That´s enough or should i do something more?

Background is, i got me this message by my system :

----- The following addresses had permanent fatal errors -----
<xxxxxx@xx.xx>
     (reason: 550 relaying to <johan@mi.cl> prohibited by administrator)

    ----- Transcript of session follows -----
... while talking to smtp.kundenserver.de:

>>> RCPT To:<xxxxx@xx.xx>

<<< 550 relaying to <xxxxx@xx.xx> prohibited by administrator
550 5.1.1 <xxxxx@xx.xx>... User unknown

Look´s tight to me, or did i miss something important?

cu
Carsten

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--
Check the headers for your unsubscription address
For additional commands, e-mail: suse-security-help@suse.com
Security-related bug reports go to security@suse.de, not here

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