why cant I receive mails

[AC Question]

I cannot receive up to.date emails

 

[mhinc]

I cannot receive up to.date emails

Your question is very vague. You are going to need to provide a lot more info if you are looking to get a reply.
Device? Mail app ( Stock, 3rd party )
If I had to guess just from what you have provided, it sounds like you have accidentally turned off your SYNC