Re: trying to restrict postfix use of port

[Camaleón <noelamac@gmail.com>]

On Fri, 22 Jan 2010 00:44:34 +0000, Adam Hardy wrote:

> Camaleón on 21/01/10 20:04, wrote:
>> A mail server has to listen at least in "loopback:25" so it can receive
>> and process e-mails internally, coming from the host itself.
> 
> Aha. Now we get to the crux of the matter.
> 
> Is it a feature of SMTP itself, that it cannot send an email without
> port 25 because it has to receive the email it is going to send first,
> even if only locally as in my case, but nevertheless on port 25?

I'm not sure you can change that (at least for the loopback interface), 
but you can try it. Here is the doc to instruct Postfix to listen in 
another port:

***
16. How can I get Postfix to listen on a port other than 25? 
http://www.seaglass.com/postfix/faq.html#chprt
***

But remember that "obfuscation" is not, my any means, a synonym of 
"security" :-)

Greetings,

-- 
Camaleón