Ports blocked

I need to find out why port 25 (and only that port) seems to be blocked.

Background:

We have had a server for about 6 Mo's with this provider.
We our-selfs have 2 scripts that check ports.
1 is self made script and the other is within ModernBill.
We have clients with other well know scripts that do not work either.

Anyway all these scripts worked prior to the last month or so.
Around the time they stopped was when our provider suffered a DOS attack. To fight this DOS attack they did something to firewall to block pinging servers etc etc.

Anyway our provider says that the firewall has nothing blocked on it and it's the problem with our "3rd party scripts".
They refuse to acknowledge all these "3rd party scripts" worked perfectly fine up until the time of DOS attacks.

So in order to prove to them that the scripts worked and are valid.
Besides the fact they all check other ports and work fine, just port 25 is not working.
I changed Exim to work on port 26 and changed the scripts to reflect that.. BAM they all work again! I think that proves the scripts are not at fault.

So instead of acknowledging that fact, they want to turn it around and say basically 'If your running Exim on port 26,of course the scripts will fail' and close ticket (NOT EXACT QUOTE).
This angers me greatly because I never ran Exim on port 26 prior to troubleshooting this issue and stated that to them prior in the ticket.

Another thing is that we all can telnet to port 25 and get a proper response.
Also email has properly worked this whole time (just in case that helps anything).

I don't get it.. what else can cause these problems if not the script or a firewall ??

 

 

 

 

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