When you use any Gmail or Hotmail or any other email for sending email then logically its not sending from actual host that's why receiving server thing its SPAM email .
So if you will use domain email then it will be goes from your server then sure it will goes in inbox.
Please do the following
1- Go to WordPress Dashboard --> Settings --> General --> Admin Email.
Here you need to put [email protected]
2- Then come to Classiera Options --> Contact Page--> Here also put same email with your domain name.
After to done these points if you still seen email in spam then you need to contact with your Hosting support regarding this.