If you are trying to connect to a mailbox hosted on your domain using a mailclient, you will need to use the following settings:
Secure SSL/TLS Settings(Recommended)
Username: username@yourdomain.com.au
Password: Use the email account’s password.
Incoming Server: mail.yourdomain.com
IMAP Port: 993
POP3 Port: 995
Outgoing Server: mail.yourdomain.com
SMTP Port: 465
Authentication is required for IMAP, POP3, and SMTP.
Non-SSL Settings (This is NOT recommended.)
Username: username@yourdomain.com
Password: Use the email account’s password.
Incoming Server: mail.yourdomain.com
IMAP Port: 143
POP3 Port: 110
Outgoing Server: mail.yourdomain.com
SMTP Port: 25
Authentication is required for IMAP, POP3, and SMTP.