Hello everyone! I'm experiencing some outlook problems and I need some help.

I've started last week to use outlook for my yahoomail account:

Incoming server: imap.mail.yahoo.com port 993

Outgoing server: smtp.mail.yahoo.com port 465 

But I cannot receive any email and I cannot send any emails. It says: Outlook cannot connect to the server. Verify that your computer is connected to the network. 

I am connected to the network so I don't understand where the issue could be!! 

Please somebody help me. I've googled but I didn't find something that could help me solving this issue. 

Thank you in advance,

Gianina