[CentOS] Strange Postfix problem

Wed Apr 10 01:28:43 UTC 2013
TE Dukes <tdukes at palmettoshopper.com>


> -----Original Message-----
> From: centos-bounces at centos.org 
> [mailto:centos-bounces at centos.org] On Behalf Of Rob Kampen
> Sent: Tuesday, April 09, 2013 7:35 PM
> To: CentOS mailing list
> Subject: Re: [CentOS] Strange Postfix problem
> On 04/10/2013 03:58 AM, tdukes at palmettoshopper.com wrote:
> > Hello,
> >
> > Was trying to setup postfix on my home PC. Running Centos 
> 6.4. I don't 
> > have a static IP and use zoneedit and ddclient to keep my 
> installation 
> > of zoneminder current.
> >
> > So I decided I wanted to get zoneminder to send me email 
> alerts. Sent 
> > some test messages but none were sent.
> >
> > I went to webdnstools website thinking maybe there is a dns 
> or network 
> > problem.
> >
> > When it checks my dns setup, everything is fine except the 
> mail server 
> > is has the wrong IP address. The A record and the www A record have 
> > the correct IP. The IP address its reporting is one that 
> belongs to my ISP.
> sounds like your ISP only allows certain services through and 
> intercepts the rest as you do not have a fixed IP.
> may want to talk to them as they control the DNS and reverse 
> DNS, both of which should be correct for email servers to 
> function correctly. 
> Basically, to do an email server you need a fixed IP.

I kind of suspected that. However, if I go to yougetsignal, port forwarding
tester and check ports 25 and 110 for my domain, the ports are open. If I do
mail.domain.com, the port is closed.

It sounds as though they are intercepting requests on those ports.