Because I have to wait for their approval and any functions or I want to have custom email templates, cut down fees...etcIs there any reason why you wouldn't use any service?
How to send emails from VPS? how to contact them to allow that and which script can I use for sending emails from VPS to inbox box without redirecting to spam box?Have you thought of getting a VPS? If you do, I would highly recommend contacting the provider prior as they may require you to let you know what kind of e-mails there are due to spam and ensure that their TOS is followed.