Seeking Comcast User

Getting close to nailing down an alternate SMTP port for traveling Birdhouse users. Have confirmed that it works with SBC/Yahoo!, and want to make sure it works with Comcast Cable Internet as well. If you use Comcast (or another cable provider for that matter) and would be willing to help me with a quick test, please contact me. You don’t need to be a Birdhouse customer to do this. Thanks in advance!