Hostgator SMTP Problem

If I use VPS instead of Shared Hosting, will my sent emails go to spam ?

shared hosting only allows you to send out 500 emails per hour. but being that it is shared hosting, you wouldn't want to do that. You will end up getting your account banned or taken by your hosting company, unfortunately HG. I would say, if you are going to send out more than 500 emails per hour, I would go with a VPS. and I would go with one that you find here on bhw. There are sales threads for it out there.

I'm trying to send only 450 emails per hour.

I've never sent more than 450 emails par hour. My main problem is that the emails don't go the inbox but to the spam folder instead :/