Re: sendmail SPAM

From: Jose Luis Hime (
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.


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. -
> Charon Information Services - Friendly, Cheap Melbourne ISP: 9589 7781
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This archive was generated by hypermail 2b29 : Sat Jan 15 2000 - 21:00:30 EST