Is there a way to check emails at work because I can't check it maybe a firewall?

go to a command prompt (in win2k/xp go to start, run, type in cmd and hit enter). At the command prompt, type:
<font color="red">telnet [mailhost] 110</font>
Note: be sure to replace [mailhost] with the real dns name of your mail server.

For example, my pop3 mailhost is mail.so.centurytel.net...so I would type:
<font color="red">telnet mail.so.centurytel.net 110</font>

and the response I get looks like:
<font color="red">Trying 209.142.136.96...
Connected to mail.so.centurytel.net.
Escape character is '^]'.
+OK &lt;12373.1086964098@mailmx.centurytel.net&gt;</font>

If you get a similar response, then you should be able to check your email. Check your email client settings and try again. If you get:
<font color="red">Trying 209.142.136.96...
telnet: connect to address 209.142.136.96: Connection refused</font>
then there's something blocking you from that address and/or port.