I can't retrieve new mail on my macbook

Dear all,

My name is Levina.. I am new user of Macbook Air..
I have already set the mail account for my office mail, it worked for 2 days, i can send and receive all emails..

After 2 days, it seems that i can't retrieve some new emails.. Do you know how to solve it? the progress bar is moving like incoming 1 from 246 mails but nothing happens..

Could you help me?

Thank you

Are you using an ISP or does your office have its own mail server? You mentioned 246 messages; is that what's waiting to be downloaded? Because it sounds like the bottle neck is with your office mail not the Apple mail program.