From: Greg A. Woods (woodsweird.com)
Date: Thu Oct 02 2003 - 00:10:45 CDT

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[ On Thursday, October 2, 2003 at 08:26:45 (+0700), Dapid Candra wrote: ]
> Subject: /dev/null for MX
>
> I recently receive so many email addressed to
> 20030805022333.0b3fa10179www.domain.com with username parts looks like
> a Message-Id. It may be some result of a virus.
>
> Is there a way to /dev/null-ing MX records for some address? I only want
> to receive e-mail to usernamedomain.com, not to
> usernamewww.domain.com, so I want to set MX for www.domain.com to a
> null address or something with /dev/null effect.

(let us use one of the official example domains, such as "example.com")

Why do you have any MX for the "www.example.com" name in the first
place? Why does your mailer accept messages for that domain name?

Is the web server that serves "www.example.com" running on the same
host as the mailer for "example.com"? If so are you able to use a
separate IP address on that same host for HTTP vs. SMTP traffic?

If you do not want to use the domain name "www.example.com" for e-mail
then ideally you should not have any MX for "www.example.com" and you
should not have any mailer answering to port 25 connection attempts on
the IP address for that host. I.e. if you don't want to receive any
e-mail for the domain "www.example.com" then do not allow any sender to
ever connect or even try to deliver any e-mail to the host serving that
domain's other services (presumably TCP port 80 for HTTP), and do not
allow any of your other mailers to recognize that domain name as valid.

--
                                                Greg A. Woods

+1 416 218-0098 VE3TCP RoboHack <woodsrobohack.ca>
Planix, Inc. <woodsplanix.com> Secrets of the Weird <woodsweird.com>

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