[nflug] RHEL 5.1/PostFix Refusing Remote Connections

[Brad Bartram]

'netstat -planet' would have also shown that there was only a listener on
localhost for port 25.

Glad to hear it all worked out.  Just remember, with open smtp comes great
responsibility.

Brad

On Dec 26, 2007 4:12 PM, Cyber Source <peter at thecybersource.com> wrote:

> incidentally, now that you know what the problem was, the suggestion I
> made would have exposed it as well.
>
> Cyber Source wrote:
> > 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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