I host my own email and never get marked as spam. One fantastic tool is: https://www.mail-tester.com/ https://www.mail-tester.com/ And another is Gmail. When

I host my own email and never get marked as spam. One fantastic tool is: https://www.mail-tester.com/ https://www.mail-tester.com/ And another is Gmail. When you send an email to Gmail you can see some spam info in the headers which you can use to fix problems. I just hope I never get blacklisted. Sometimes you can fix this by sending the blacklist a message but this is not always possible.