Chapter . Learn about Email Protocols
Read this section to learn more about mail protocols and make sure you are using protocols in a smart, trouble-free way.
Counterintuitively, receiving and sending email generally have nothing to do with each other in terms of the protocols (and often the servers) used behind the scenes. I mention this because you may find that you can receive email perfectly well but not send any—or vice versa. If you understand how Mail handles sending and receiving, solving problems becomes much easier.
Although you may not be aware of it, to send and receive email, you actually have two email accounts: one for sending and another for receiving. Your two accounts may share the same user name and password, but that is typically ...