Very newbie relaying question

[Carles Xavier Munyoz Baldó]

Hi,
You need to setup SPF in your domain's DNS database.
More info in google ;-D

Greetings.


On Thursday 03 May 2007, Declan Grady wrote:
> Hi folks,
> I've just rebuilt my mailscanner+sendmail box using debian etch, and
> after a lot of head-scratching got it up & running ok.
> (Old box suffered hardware failure, was a redhat 7 with a lot of patches
> & updates, etc, but was handy for upgrading mailscanner from rpms.)
>
> While watching the spam messages, I've noticed quite a few supposedly
> coming from my own domain name.
>
> I'm 99% sure I can restrict it so that if the sender is supposed to be
> in my own domain, it must be from a local IP address, otherwise reject
> it.
>
> I have googled, but get lost in all the authentication stuff.
>
> My mailscanner box is a gateway - just takes incoming mail, scans &
> passes on to a windows exchange box, using a sendmail mailertable.
>
> What do I need to do to my sendmail config to permit mail from my domain
> to be only accepted from internal IP's ?
>
> I'm guessing I need to change my /etc/mail/access file somehow ?
> Currently it has (among other things)
>
> mydomain.com             RELAY
> localhost.mydomain.com   RELAY
> mail.mydomain.com        RELAY
> mailserver.mydomain.com  RELAY
> mydomain.ie              RELAY
> exchange_server_name     RELAY
>
> Obviously some of these are not necessary, and are from my tweaking it
> trying to get it working.
>
> Or, is there some clever way to do it.
>
>
> Thinking out loud, all mail from mydomain will come from the exchange
> server, which has a single fixed IP address - Mabye that is a way to do
> it ?
>
> Thanks for suggestions.



-- 
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Carles Xavier Munyoz Baldó
cmunyoz at unlimitedmail.net
http://www.unlimitedmail.net/
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