Re: sendmail SPAM

From: Jose Luis Hime (jhime@synchro.com.br)
Date: Fri Jan 14 2000 - 08:06:18 EST


I have a RedHat 6.1 server, and it does not relay anything that is not
included in /etc/mail/relay-domains.

It checks the ip address of the sender, tries to "reverse resolving" this
address and if it does not belong to my domain the mail is not relayed.

Regards,
Hime

At 08:21 12/01/00 +1100, Kendall Lister wrote:
>On Mon, 10 Jan 2000, George Laiacona III wrote:
>
>> >Which version of Sendmail are you using? It should not be forwarding mail
>> >with a fake domain.
>>
>> How about verifiable doamins? As far as I understood, the latest
>> Sendmail should refuse any relaying, yet through conducting a test on
>> a Red Hat 6 server, I can send a note through that server from another
>> domain. The user is valid, but we didn't "log on" to the server, just
>> sent SMTP mail through it. How does it know if the user was valid
>> then?
>
>Checking user names doesn't have anything to do with relaying. If your
>Sendmail is allowing relaying then you should reconfigure it - I have no
>idea how Redhat have set up their Sendmail package, but I would be
>surprised (and disappointed) if it was an open relay out of the box.
>
>--
> Kendall Lister, Systems Operator for Charon I.S. - kendall@charon.net.au
> Charon Information Services - Friendly, Cheap Melbourne ISP: 9589 7781
>
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