Email stopped working

About an hour ago (9:00 PDT) I started getting error messages on all of my Cox accounts saying that the "Login to server imap.cox.net with user name xxxx failed".  I reentered my password with no success.  I was able to login to webmail.cox.net with the same password but couldn't send any messages (no error message).  I recycled the modem and router and restarted my PC to no avail.  About 15 minutes before the problem showed up all was well and I was sending emails.