what to do in oreder to send email automaticully on a particular time?

hi friend's
I feel sad because my college ranking is published today and it's vary bad.
looks like no one is intrested in voting our college.
well we learn from every moment.
I want to do such thing that vote for my college also when i am offline.
so tell me what i do that my gmail send vote for my college on every 5 minute while i am offline.