[nflug] RHEL 5.1/PostFix Refusing Remote Connections

[Cyber Source]

And on that note, you could use our friend nmap to see what is listening 
on the public IP, "nmap publicip", you could compare this against "nmap 
internalip"

Erek Dyskant wrote:
> Robert,
> 	Your ISP is probably filtering port 25 outside of their network, as
> ISPs have had so many problems with open relays sucking up all their
> bandwidth.  Sadly to run a mail server these days one generally needs to
> have a dedicated server or a business-class connection these days.
> 	Call your ISP to ask what ports they filter, and see if there's any way
> you can convince them you know what you're doing (if your ISP is
> localnet you may be in luck <grin>)
> 	Best of luck.
>
> --Erek
>
> On Wed, 2007-12-26 at 15:07 -0500, Robert Wolfe wrote:
>   
>> Good afternoon everyone.
>>
>> I run RHEL 5.1 at home using Postfix as my MTA.  The problem I am having 
>> is that I can telnet to localhost on port 25 and connect all day long; 
>> however, no other MTA OUTSIDE my network is able to connect to my 
>> Postfix server to receive mail.  Port 25 is opened and forwarded on my 
>> router and firewalling has been turned off on the server itself.
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>
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