Configuration was pretty easy. Setup SPF, DMARC, DKIM. Chose a reputable provider, checked the IP is not blacklisted anywhere(had to try a few IPs). Verified that all configuration was right.
Then when I started replying to emails, I would never hear back from the recipients. I created a Gmail account and sent an email to myself and lo and behold my reply went straight straight to spam. Despite the mail headers saying everything was checked and was fine.
I’d love to hear ideas of what I did wrong. I tripled checked SPF and DKIM. Verified IP with McToolbox, Spamhaus, etc..
Also my domain is 10+ years old and has been hosted by google and fastmail in the past and only for very low volume private emails.