Please add the following:
Open Outlook and select File > Add Account
On the next screen, enter your email address, select Advanced, check the box for Let me set up the account manually and select Connect > Choose your account type.
Most of the time when you need to use this option, you can select IMAP and enter the following:
Outgoing server: mail.dmail.sa
IMAP port: 993
POP3 Port: 995
Incoming server: mail.dmail.sa
SMTP port: 465
Enter your password and select Connect
Then make sure to add mail in the app and try sending and receiving messages.