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AT&T Midwest/Ameritech FAQ »Does ameritech block any ports? (Update 08/16/2005)) - and this may extend to other areas over time.
If you feel you are being blocked you should first check your own firewalls or routers. You can then try the Telnet test found here: »AT&T Midwest/Ameritech FAQ »The Telnet Test for SMTP Server Connectivity
If you find Port 25 is blocked by SBC you can follow the instructions in this document: »AT&T Midwest/Ameritech FAQ »Here's what to do if port 25 is blocked for you