email not getting send from Lan

actually everythin is fine at home.. emails are getting send from the
rails application to gmail account through which we send our
emails..but wen we use the same code in college computer connected to
Lan the emails where not getting send from the rails application to
our gmail account and hence the mails where not getting delivered ...
does any one have the idea for this problem..all the firewalls in
college computer has been removed even the anivirus also

I'd use wireshark to make sure the packets are getting sent to gmail.

If you load the development environment from the console and call a method that sends an email you'll be able to see the entire conversation with the server.

so guys wat actually should i do now..

were you able to follow the previous suggestions? What was their output?