Mass Mailing Spam Problem

Hi Everybody,

I'm using Hostgator Shared Hosting for mass mailing, but the issue is that all my messages go to spam folder.
At First, I sent one email to my gmail adress and it didn't go to spam, but when I sent a lot of emails (including one of my gmails account) I realized that it went to spam. Can someone help me please ?

Can be many causes, try to send 500/h from the same ip/domain , if you trying to send more than 500/h the webmails mark you like a spammer.

That's what I did , I only send 450 emails per hour no more than 900 per day

there are many reasons why the mails get marked as spam.
some include:
1. many of your people marking your email as spam
2. blacklisted ips
3. no spf dkim and other config.
4. email body with a very high spam score


these are just a few , if you need help feel free to get in touch with me.