I can't send email from Outlook

Steps

1. 1

   Sign in to webmail: open yourdomain/webmail and try sending.

2. 2

   If webmail works, the problem is Outlook's setup; if it fails, open a ticket with the error text.

3. 3

   In Outlook check the outgoing server: port 465 with SSL/TLS or 587 with STARTTLS.

4. 4

   Enable “My outgoing server requires authentication” using the same credentials as incoming.

5. 5

   Make sure the mailbox is not full, then try again.

Source: مكتبة شروحات مازن هوست / MazinHost knowledge base · cPanel Docs - Set Up Mail Client