I need some help to change the SMTP port which is blocked by Comcast. I was using port number 25. It is not blocked and the mail service is not working. I cannot send any mail from SBS 2003. I am not able to find any information on how modify the port for smtp. I am trying to look some settings and the ISP is not helping me out. I am trying to do that manually but it looks that the issue lies on the isp end also. What are the ways available that can provide me information on what all ports are open.
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