Email Issues

I am unable to send or receive emails on any of my devices (Ipad, Android Phone, Computer through Outlook as well as logging into the Cox Web App.) They all come up with no error messages, seem to send and receive just fine, but have not given me a new email message in 3 days. I even try and send them to myself and it appears to go out...but even that is not showing up since my Friday test. Now they just appear to be sent but never show up in my sent folder. Please help.