No not at all. However if you exchanged e-mails for school purposes then he may expect you to contact him that way for school, but you can start your way from school to other topics and work your way up.
Theres nothing wrong with talking to people no matter how you do it
I'm a Canadian currently studying electronic engineering at Humber college and I'm wondering how well are college students paid and the chances are for finding a job in the field. Should I continue my studies to universities after I graduate or will a college diploma be enough.