Support Topics: Email: How To: Setup Apple Mail Application (IMAP)
Double Click the Mail App
icon to open the Mail App. Once open, go to Mail > Preferences...
in the menu bar.

Once in the preferences, click on Accounts icon
at the top of the preferences pane. On the bottom of the left
hand side, click on the + icon to add a new mail account. On the
right side, you will see a place to enter your settings. Start
by selecting IMAP from the Account Type pulldown menu.

In the Description field, you can type anything.
This is so that you can identify which email account you're working
on (since the Mail App allows you to check and send from multiple
accounts). In this example, we've just called the account My MacHighway
IMAP account.
In the full name field, type your name.
The email address field is where you type the
IMAP email account you setup in the MacHighway Mail Control Panel.
Click Continue.
In the Incoming Mail Server field, type mail.machighway.com
In the User Name field, type your username (this
is the same as your email address, except you'll use a % instead
of an @)
Type in the password you originally assigned to this email account in the password field.
Click Continue.

In the Outgoing Mail Server field type mail.machighway.com
Check the Use Authentication checkbox.
In the User Name field, type your username (this
is the same as your email address, except you'll use a % instead
of an @)
Type in the password you originally assigned to this email account in the password field.
Click Continue.
You've now set your Apple Mail application to check your IMAP account, but a problem unique to the Mail app is it's inability to recognize the Sent folder as being the Sent folder. So, we've got to tell the mail program the function of the sent folder.
But even before that, we have to get the Apple Mail app to see the folders on the server. Go under the Mail folder, select Preferences > Accounts and highlight the IMAP account you've just created.
Now, click the "Advanced" tab at the top of that window.
Near the middle of the window you'll want to put a check next to "Automaticall synchronize changed mailboxes". Once that's checked you can close the window and save the changes.

You should now see a triangle pointing to the right next to the Inbox for that email account. If you don't see this triangle, you may need to restart the mail application and then click "Get Mail". Once you see the triangle, click it so that it exposes your "Drafts", "Sent" and "Trash" folder (along with any other folders you may have created).
Click on the "Sent" folder below your inbox to highlight it.

With the "Sent" folder highlighted, go to the "Mailbox" menu item, select "Use this Mailbox For" and then select "Sent".

You've now completed the setup.
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