Step 1
Once you have opened Mac Mail, click on Mail > Add Account

Step 2
Next select the option for Other Mail Account, and click Continue.

Step 3
Enter a Display Name, your Email Address and your Email Password, and click Sign in.

Step 4
You will now need to enter the following server information, and click Sign in.

Step 5
You can now click Done to complete the setup.

Additional Notes:
There are various methods of connecting to mailboxes on our platform. We always recommend IMAP as that helps keep messages in sync between various devices and our webmail system.
This is our recommended configuration for Mac Mail.
Incoming Server
Server Name: imap.stackmail.com
Username: Your e-mail address
Port: 993
Connection security: SSL/TLS
Authentication method: ‘Normal password’
Outgoing Server (SMTP)
Server Name: smtp.stackmail.com
Username: Your e-mail address
Port: 587
Connection Security: STARTTLS
Authentication method: ‘Normal password’
If you choose to use domain-branded server names, such as mail.your-domain or imap.your-domain, the secure connection may throw a certificate warning due to a common name mismatch. This can be safely trusted and your connection will remain secure.