As you did not state if you were wifi and/or cell connecting it is hard to help....basically, if you can connect (web) it is your mail settings that needs to be looked at.
1. How do you have it setup on your workstation....
2. Is the error both inbound and outbound.....
3. The list could go on and on....depending on your settings/account

As I do not nor know of anyone using the listed servers that is all I can do to help...

Good Luck...