What should my incoming and outgoing mail server be?

Here are some examples of the most common free email servers and the format for their mail server addresses:

1. Gmail incoming mail server: pop.gmail.com.
2. Gmail outgoing mail server: smtp.gmail.com.
3. Yahoo! …
4. Yahoo! …
5. AOL incoming mail server: imap.aol.com.
6. AOL outgoing mail server: smtp.aol.com.