Re: Requiring reverse DNS lookup

From: Ralf Hildebrandt (no email)
Date: Wed May 01 2002 - 16:33:06 EDT


On Wed, May 01, 2002 at 07:19:56PM +0100, Peter Barnwell wrote:
> Hi,
>
> Currently I have my server configured to require that any sending host
> has a valid reverse DNS lookup, which has cut down the amount of UCE we
> receive a lot. However we have one client who has no reverse lookup, and
> insist they have no intention of fixing it.

So make an exception for them

> smtpd_recipient_restrictions = permit_mynetworks,
> reject_unauth_destination
> check_sender_access hash:/etc/postfix/sender

insert:
    check_client_access hash:/etc/postfix/bloody_ips

> reject_unknown_client
> permit

and in hash:/etc/postfix/bloody_ips you have:
1.2.3.4 OK

-- 
Ralf Hildebrandt (Im Auftrag des Referat V A)   
Charite Campus Virchow-Klinikum                 Tel.  +49 (0)30-450 570-155
Referat V A - Kommunikationsnetze -             Fax.  +49 (0)30-450 570-916
If we can dispel the delusion that learning about computers should be
an activity of fiddling with array indexes and worrying whether X is
an integer or a real number, we can begin to focus on programming as a
source of ideas.
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