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Actually it is the SMTP portion that you cant access from another ISP.
POP3 (Post Office Protocol v3) = Email server where you get your new email from. Generally POP is authentication based. For SBC and Earthlink it is. You use a username and password. You can generally access your POP email from any ISP as long as you have the correct username / password combination. For Earthlink and SBC you can access their POP servers from any ISP that will allow it. You generally cannot access ISP's SMTP servers from outside their network.
SMTP (Simple Mail Transfer Protocol) = Email server that sends email for you. In the past you could use any SMTP server to send your email. They were all open and didnt require a username / password. Spammers loved this
so people started locking down both their SMTP servers (if they were companies) and their networks (if they were ISPs). The end result has been a big mess for users with laptops that need to send email from anywhere on the planet.
Now, the specific problem with Earthlink is that in order to reduce spam they wont allow you to use port 25 (which is used for SMTP) to any server except their servers. This is fine if you use an Earthlink email address, and an Earthlink dial-up always. I have recent reports that Comcast may be doing this as well. I prefer to have my email require a password for SMTP and NOT have my email address associated with my ISP. That way I can change my ISP but keep my email address
I can pay a third party to have
mweitz@mycompany.com and use whomever (SBC, Covad, etc) to supply the bandwidth. Try to keep away from having an @yourISPname.com email address. Locks you into the ISP to a certain degree IMO.
If you have specific questions on how to do any of this, feel free to PM me.
Mark