I can no longer receive emails

Need some details, in what program? Was anything changed/added/removed? Did you change your password or any other settings?
 
Completely unable to give anything more but random guesses with this lack of information?

Who is the email through (so what is the @...... portion)?
If not a public gmail/hotmail/yahoo/etc then what company actually hosts the email (godaddy, hostgator, etc)
Are you using webmail or a program like outlook/thunderbird?
Can you send emails?