iMac Lion Mail problem

[fabrizio28]

I have an iMac with Lion. I am able to send emails using Mail but have not received emails since 12/15/14.

 

[Headrush]

What kind of email account is it? (iCloud, POP, Gmail)

Are there any error messages or other notifications? (Mailbox icon with a lighting bolt or top sign)
Can you access this same email through other means? (web access)

 

[fabrizio28]

It is the mail account provided in Lion. There are no error messages. I can access emails with my Yahoo account.