How to block emails that FROM doesn't belongs to server domain list

Rob Verduijn rob.verduijn at gmail.com
Thu Aug 16 09:17:28 IST 2012


Oops ... need to wake up here.

replace ptr with spf
I meant spf records (sender policy framework) duh....

http://www.openspf.org/SPF_Record_Syntax

Rob


2012/8/16 Rob Verduijn <rob.verduijn at gmail.com>:
> Hello,
>
> If you mean mails that fake sending from your domain to your domain
> (or anywhere else) you might wanna look into dns ptr records.
> It's a simple trick that allows the receiver to perform a dns lookup
> on the sending mail server to verify if it's one of the valid mail
> servers for that domain.
>
> It's not foolproof since the receiving end has to do this, but if the
> receiving end is you it works like a charm :)
>
> With ptr dns records you will no longer receive mails from a sender
> that claims to be from your domain, and a lot of other mail servers
> who have their ptr record defined as well.
>
> I know google uses it since I forgot a mailserver in the dns ptr
> record once, and it started rejecting all the mail from that specific
> mail server.
>
> Rob
>
>
>
>
> 2012/8/16 Sergio <secmas at gmail.com>:
>> Hi all,
>> how may I can block and delete any email that is trying to be delivered from
>> the server that the FROM is none of the domains that belongs to the server?
>>
>> Could this be done?
>>
>> Best Regards,
>>
>> Sergio Cabrera
>>
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