Sometimes whatever emails you send is reaching on spam folder of the receiver.
If you are sending any Bulk Emails or email to unknown users that all are being tracked by Google and other Spam Filter sites.
Once they got that your domain is doing spam or sending unwanted email to known /unknown users then it marks your domain or server IP in the spam.
In a Shared Server, it is possible that you are getting issues because of others. Our Team continuously monitor such users and Remove there account from our server.
It is recommended to use Professional Email Hosting Services if you don't want to face such an issue with your company email ids.
