Why would My Mac quit recognizing my gmail and iCloud accounts
Spontaneously my Mac quit recognizing my two gmail accounts, my iCloud account, and my email through a local cable company. They still appear in my preferences, and show up when I go to my favorite boxes; but, the icon in the Dock will not close, and no mail is sent or received. I uninstalled all four accounts and reinstalled them to no avail.
iMac (27-inch, Late 2013), OS X Yosemite (10.10.2)