Configure Mail for Mac
Access the Mail menu item
Select [Add Account ...]
Select Add Other Mail Account ...
Press [Continue]
Complete the details matching your own mailbox details
Press [Create]
You will be prompted to manually configure further details
Select [IMAP]
Complete the rest as per the above image
Press [Next]
Complete as above.
Alternatively, use user+sent@example.com modified as per your mailbox, to speed up sending of messages.
The password is the same.
Be sure to disable copying to the Sent folder, as the SMTP server will do so for you, with the user+sent@example.com setting.
Press [Create]
Once Mail has connected to your mailbox ...
Open the Mail menu item.
Select Preferences...
Access the [Accounts] tab
Select the applicable account in the left-hand column.
The following information will be shown to the right of the above.
Correct Your Name if you would like recipients to see another name, when they receive your email.
If you DID NOT use the user+sent@example.com settings in the initial SMTP configuration window, you may wish to fine-tune the SMTP settings to both speed up the sending process and save bandwidth. This is VERY USEFUL if your Mac is on a mobile network with restricted Internet bandwidth and where data is costly.
To continue with the fine-tuning of SMTP, access the Outgoing Mail Server drop-down menu and select Edit SMTP Server List...
Change the Port to 465
Ensure that Use SSL is selected
Change User Name to user+sent@example.com (replacing the user and example.com parts with your own address' equivalents)
Enter your mailbox's password
Press [OK]
When returning to the [Account Information] tab ...
Select the [Mailbox Behaviors] tab
ONLY if you have configured the user+sent@example.com setting for SMTP, do the following.
Remove the tick next to Sent
Ensure that the other ticks are selected, as per the above.
Then, access the [Advanced] tab
Complete the form, as per the details above.
Access the [Junk Mail] tab in the main Accounts window.
Remove the tick next to Enable junk mail filtering
The server has its own built-in spam/junk filter.
It is now time to test your settings.
Compose a new message to yourself.
Send it!
You may be prompted again, to enter your password, particularly if you chose to use the faster SMTP settings.
Enter your password and press [OK]
Access your Inboxes folder to check for your test message.
Access your Sent folder to check that your sent message was saved.
Congratulations, your new mailbox is configured!