Outlook not connecting to mail
Good Day.

I have a client for whom I am designing a website. Now I moved his domain from one ISP/host provider to another.
He deleted his email account in Outlook and tried to add it again, but it keeps failing. I tried both pop3 and imap, but none works:

Here's the tricky part: I used the EXACT same settings in Outlook on MY PC, and it connects fine, everytime. Why wouldn't his Outlook connect to the mail server, but mine does? I don't suppose it is a firewall since he has 2 other mail accounts on Outlook that works fine(the 2 other accounts are on a different domain.) As I said, I tried deleting the account and added it again, but nothing (I do NOT use SSL and I also made sure the settings was not for secure mail.

Any ideas?

Thank you!