Use these settings:
- Account type: IMAP
- Incoming mail server: imap.stackmail.com.
- Outgoing mail server: smtp.stackmail.com.
- Incoming server port (IMAP): 993
- Use the following type of encrypted connection: SSL
- Outgoing server port (SMTP): 465
- Use the following type of encrypted connection: SSL/TLS
When setting up your account, please choose More Settings > Outgoing Server and check the box for ‘My outgoing server (SMTP) requires authentication’.