I run my own mail server that has been running fine, but recently emails are getting caught up on SPAM and the only thing I can find is dkim=fail (no key for signature)
. The mail server is based on a Virtualmin platform installed.
But when I send a test to mail-tester.com I get a 10/10 success and it reports DKIM is OK.
I have checked the IP address in blacklists and there's nothing there, I only use the mail server for my own applications so I know it's not used maliciously.
Not sure where to look other than to contact Microsoft about it?
Any ideas other than to contact Microsoft?
Thanks.