POP3 (Post Office Protocol) setup will go out to the mail server and download the emails into your mail client. Once that is done, it'll delete those emails from the server.

---

Click on the "MacMail" icon.

Once MacMail is opened, click on Mail / Preferences.

In the "Accounts" window, click on the Plus sign (+) located near the lower-left-corner.

Full Name:

Type in your name.

Email Address:

Type your email address.

Password:

Type in the password used for your email address.

Click the "Continue" button.

This window may pop-up. Click the Connect button.

Account Type:

POP

Description:

PoundLLC

Incoming Mail Server:

mail.mailconfig.net

Username:

Type in your email address

Password:

Type in the password used for your email address.

Click the Continue button.

After clicking "Continue", this window will appear.
Let it finish checking the information.

Uncheck - Use Secure Sockets Layer (SSL)

Authentication:

Password

Click the Continue button.

Description:

PoundLLC

Outgoing Mail Server:

mail.mailconfig.net
Check - Use only this server

Check - Use Authentication

Username:

Type in your email address

Password:

Type in the password used for your email address.

Click the Continue button.

Verify the account information, if correct, click the Create button.

After clicking "Create", you'll be at this window.
If not selected, select Glis in the left-hand column.

In the Outgoing Mail Server (SMTP).
Drop the list down and select Edit SMTP Server List...

In this window, select the mail.mailconfig.net account.
Click the Advanced button.
Uncheck - Use Secure Sockets Layer (SSL)
Drop the list down on Authentication and select Password. Click the OK button and close out of the Accounts window.
That's it!