These instructions were written for Outlook 19, but should be similar across most versions.
IMPORTANT: If you didn't see the options to add the incoming and outgoing mail servers, please click here for further instructions.
Incoming Mail Server
Host Name: hosting.opendoorinternet.co.uk
Username: ###USERNAME###
Password: ###PASSWORD###
Encryption Method: SSL/TLS
Port Number: 993
Outgoing Mail Server
Host Name: hosting.opendoorinternet.co.uk
Username: ###USERNAME###
Password: ###PASSWORD###
Encryption Method: SSL/TLS
Port Number: 465