Help me argue against AT&T blocking my outbound SMTP traffic

[Torolol]

most ISP block these connections though, unless you forks more $$$ for these 'extra':

 

[Shadrack]

Can't you just use a different port number?  A lot of  ISPs block the default set of ports but almost all servers will work just fine on a port that you specify and most client software can be configured to connect to a port you specify. 

[Roger H. Veteran]

Changing port to another port does you no good if other servers don't know to send it to you on another port. That's what standards are for.

 

You can listen on any port you want but if my server is sending on 25 to your 25 and gets no answer it will fail.

 

There are obviously workarounds as mentioned by BudMan but honestly it's prolly easier/cheaper to get a static IP which then allows you to open whatever port you need.