________________________________
From: centos-bounces@xxxxxxxxxx
[mailto:centos-bounces@xxxxxxxxxx] On Behalf Of Don Knott
Sent: Sunday, January 14, 2007 8:09 AM
To: CentOS mailing list
Subject: Re: Firewalling SMTP
On 1/14/07, Denis Croombs <denis@xxxxxxxxxxx> wrote:
I have a Centos server and I want to only accept mail
for the local users
from 3 mail servers, but I still want the users to be
able to send emails
through this server, If I firewall the SMTP port to my 3
mail servers is
there any way users will be able to still send via the
main POP server ?
(currently using Sendmails SMTP-Auth)
Thanks
Denis
____________________________
I would setup SMTP-Auth and have sendmail ALSO listen on port 587 for
users' to relay their mail. An external mail server would not attempt
to deliver mail to a port other than 25. I'd use iptables to drop all
connections to port 25 except for the 3 external hosts you
want...problem solved.
Mike
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