POP3 Setup not Responding

I am trying to setup a pop3 connection between my work email and zoho mail. Unfortunately I keep getting this error: " Could not connect to the mail server. Kindly check if the mail server name and port settings are correct.". I have used these exact setting for importing to my Gmail account and they worked fine. Is there any reason why the POP3 might not be working? Is there any known issues currently with the system right now? I am using: port 110 unsecured