doneWebs is providing email services through a hosting service by One.com. They have developed the following setup guide:

Step 1 - Click Mail > Add Account

Step 2 - Select an account type

Step 3 - Enter your account details

Step 4 - Enter mail server settings

Step 5 - Select only Mail app

Step 6 - Go to Mail > Preferences

Step 7 - Change incoming server port

Step 8 - Set correct sent and trash folders

Step 9 - Check Mailbox Behaviors


Step 1 - Click Mail > Add Account

  1. Open the Mail application on your Mac.

  2. Click Mail in the top left corner and select Add Account...

Click Mail and then Add account

Step 2 - Select an account type

Select Other Mail Account... and click Continue.

Select Other Mail account and continue

Step 3 - Enter your account details

  1. Type in your name, it will be visible as the sender.

  2. Enter the email address you want to set up.

  3. Enter the password, you also use it for Webmail.

  4. Click Sign in.

Enter your name, email and the password the belongs with the account

Step 4 - Enter mail server settings

You will now see a red error message, just ignore this.

Enter the following server settings:

  • Account type: IMAP

  • Incoming Mail Server: imap.one.com

  • Outgoing Mail Server: send.one.com

Click Sign in.

Enter the settings for the incoming and outgoing server

Step 5 - Select only Mail app

Uncheck the box for Notes, so only the Mail app is selected, and click Done.

Uncheck the Notes app

Step 6 - Go to Mail > Preferences

Click Mail in the top left corner and select Preferences....

Click Mail and then preferences

Step 7 - Change incoming server port

  1. Click Accounts in the top menu.

  2. Go the the tab Server Settings.

  3. Under Incoming Mail server, uncheck the box for Automatically manage connection settings.

  4. Change the portnumber to 993.

  5. Click Save.

Go to the tab server settings

Step 8 - Set correct sent and trash folders

By default, Mail selects the wrong folder to save your sent and deleted emails, so you need to manually change it to the correct folders.

  1. Go to the tab Mailbox Behaviors.

  2. Click the Sent mailbox and change the folder to Sent, @ your email account.

  3. Click the Trash mailbox and change this folder to Trash, @ your email account.

Note: Mail OS X may not be able to detect IMAP folders that are empty. If the correct folder is not available, log in to Webmail and place an email in the folder. Then try again.

Click Sent Mailbox and select the correct folder

Step 9 - Check Mailbox Behaviors

In the end your settings in the Mailbox Behaviors tab should look like in the screenshot below.
The INBOX prefixes will be added automatically.

Go to the tab Mailbox behaviors
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