Roberto C. Sánchez a écrit :
On Thu, Oct 04, 2007 at 04:31:06PM +0200, Tristan DEFERT wrote:
hi all,
since wanadoo/orange blocks any outgoing smtp traffic other than to
their SMTP server/relay, my customers who have such xDSL accounts cannot
reach directly the smtp service we provide anymore.
I'd like to trick that by allowing them to reach my smtp server of port
26 instead of 25, without perturbing the other customers.
I got a firewall that bridges a WAN zone to my DMZ zone.
In DMZ zone is the SMTP server that answers on port 25, as usual.
I'd like that any incoming connection to my smtp server on port 26 to be
redirect to this smtp server on port 25.
But i'm a bit confused: what should i do? DNAT or REDIRECT? on the mail
server itself :-( or on the firewall :-) ?
You are going about this the wrong way. The "correct" way for them to
connect would be to use the submission port (587), which is defined as
the entry point for new mail into the SMTP system. Then you can have
your mail server listen on 587 and 25 and then you don't have to worry
about redirecting using shorewall.
Regards,
-Roberto
In mail clients, we just have to change 25 with 587 ??? It seems too easy !
Else, you can try to activate SMTPS... (tcp/465)
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