POP account stopped sending and receiving-can't figure it out!

I've wasted a few hours already trying to figure out what went wrong. As far as I can tell, my server (optimum) is working fine. I'm getting the message "mail could not log into the account b/c the server is down". I don't believe that to be the case. What else can I check?

A easy way to test and see if a server is up is by using the ping function of Network Utility(found at /Applications/Utilities/Network Utility). Just send one or two to the address listed in your account info, and see if it responds.
Keep in mind though, you want to keep the number of pings pretty low, as servers admins don't normally appreciate getting ping flooded And also, some servers(generally private ones) wont respond to ping requests, but in my experience pretty much all public servers will, as long as they are online.

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