At work my Wifi can get internet & all else but no e-mail, any ideas?

[WBFAir]

Hello all.

On my Wifi connection at work with my TP2 it works like this.

It shows a unlocked possible Wifi connection that I am able to connect to, then if I try to bring up the browser and surf is takes me to a webpage that asks for a user name an password which I have and input and after, I can surf and use the weather update and even the QuickGPS with no problems. (although I haven't had a chance to check those last two before the PW thing yet).

Also for at least the rest of the day if I go out of this connection for a relativity short period of time such as lunch, I don't have to redo the password thing basically at least as far as I have seen till the next day.

But when at any time I am connected when I try to get or send any e-mail via the Pop3 connection, which btw works just fine for all other Wireless LAN's I have, it won't connect.

I know there are a huge amount of variable here but if anyone has any ideas they can throw at me to try, I would be very grateful

Thanks all.