Why can I use my ISPs (i.e. Sympatico, Rogers, etc) SMTP server when I travel?
ISPs) make SMTP servers available to their customers. Unfortunately, they restrict use of those servers to computers that are on their networks. So, if you have configured your laptop to use your ISP’s SMTP server when you are at home, you will not be able to send e-mail using that server when you travel, since you will be accessing it from a different network (a dial-up account, a hotel, a network at work, a wireless network etc.).
