I can’t send or receive email since Oct 18, 2013

  I'm using a Mac and my normal browser is safari. I've also tried to sign into my outlook account (outlook.com) via Chrome and It has the same result. I've also tried computers that aren't Mac's. Just to be clear, regardless of the computer or browser I can't send or receive emails but all past emails/info, regardless of the folder or location are completely accessible. This is only a new in coming/out going  email issue that has been noticed since Oct. 18, 2013.  How can i fix this!