Gmail keeps putting email notifications from here in the spam folder even after marking them "not spam" several times. Gmail provides this link for more info: https://support.google.com/mail/answer/81126?hl=en#authentication Looks like DNS entries need to be cleaned up a bit -- there are no reverse PTR records for either IPv4 or IPv6 addresses shown in the headers, and server.arkadiastudios.com does not resolve either. P.S. I setup my first mail server over 20 years ago, so I can help fix it if you need. I accept good UL items in payment.