Over the past few days my daily forum update emails have been going into my Spam folder instead of inbox. I tried testing the forum emails by attempting to sign up for a new PJRC forum account using mail-tester.com and got these results, with a few things that could be improved:

https://www.mail-tester.com/test-gxnwr805p&reloaded=1

Your message is not signed with DKIM
You do not have a DMARC record

Maybe adding this to the mail server would help? In the meantime I'll just keep pulling PJRC messages out of the spam box.

I'm using the paid Google mail service (whatever they're calling it now) and MailMate on the Mac for my client. I'm honestly not sure who's deciding what is spam.