If you’re looking for a simple, inexpensive email solution that includes your domain name in your email address, POP3/SMTP accounts are for you. They’re inexpensive as a stand-alone plan, and included free in most Web hosting plans. Basically these accounts connect you to a POP3 and SMTP server for receiving and sending email messages.
POP stands for post office protocol. And 3 refers to the generation of the protocol. In the simplest terms, it is a method for downloading mail from a server to your email client.
SMTP stands for simple mail transfer protocol. It is a protocol for sending mail from your email client.
When you receive an email message from a POP3 account, here’s what happens:
When you send a message using SMTP, here’s what happens:
Because messages are deleted from the POP3 server after they’re downloaded, email can be accessed once from the server. They can only be read on the machine where you downloaded the message—you cannot access your already read email messages remotely. That’s the disadvantage of using a POP3/SMTP accounts.