Can't set up Inbox.com POP3 E-mail account. Keep getting the following error message:

service.FAILURE: system failure: Unable to connect to POP3 server: DataSource: { id=c255b2db-42f2-4ce2-90d1-18564d2418cc, type=pop3, isEnabled=true, name=Inbox, host=my.inbox.com, port=110, connectionType=cleartext, username=logos.mail@inbox.com, folderId=2 }

What to do?