If you test your email redirection by sending an email from your Gmail account to your domain that forwards back to your Gmail account, Gmail will detect the loop and delete the email without warning you.
For example, if you send an email from you@gmail.com toward contact@your-domain.com that is managed by ImprovMX, and contact@your-domain.com redirects back to you@gmail.com, Gmail will drop the email without notice.
If you’ve tested your email that way and haven’t received the email back, this is normal. If you want to test your forwarding, we recommend using https://sendtestemail.com/.