I have a home mail server and GMail accepts mail from it no problem. Outlook tends to drop my mail in the recipient's Junk folder but I haven't encountered any

I have a home mail server and GMail accepts mail from it no problem. Outlook tends to drop my mail in the recipient's Junk folder but I haven't encountered any outright rejection. I do have SPF, DKIM, DMARC, and rDNS setup.