Hello again.

I will try to be more specific about the problem we have with ListServ 
14.5 on a Windows 2000 server machine. I hope I can make my self clear 
this time.

Everything was working just fine:
-Windows 2000 Server IP 200.56.226.202
-ListServ 14.5
-Mirapoint from Razor Gate as the SMTP IP 200.56.226.203
-site.cfg
   NODE=DIDAGE.ORG.MX
   SMTP_FORWARD=200.56.226.203
   SMTP_FORWARD_1=4*200.56.226.203
   MYDOMAIN=DIDAGE.ORG.MX

Then my ISP asked us to change the IP because they had to change their 
IP's blocks.
So we proceeded to do the changes:
-We changed the Windows Server IP. (148.244.85.212)
-We changed the Mirapoint IP. (148.244.85.213)
-We changed the site.cfg file:
   NODE=DIDAGE.ORG.MX
   SMTP_FORWARD=148.244.85.213
   SMTP_FORWARD_1=4*148.244.85.213
   MYDOMAIN=DIDAGE.ORG.MX
-We also changed the DNS records (A and MX too).

Now we can't send any email throghout the ListServ.
The log file says that the ListServ is receiving emails.

Thanks to all of you, who had responded to us we have did some tests to 
see what's wrong, but none of this was usefull:
-Disabling and enabling the Firewall (OfficeScan, by the way).
-We have the Group Mail software and it worked fine, we can send emails 
through it.
-We tried with less SMTP workers.
-A log file (SMTPS#1-20070124.LOG) example line: 24 Jan 2007 00:00:12 
Receive error: Unknown error [10060]

So please let me know if I have missed something in the configuration or 
what.

Best regards,