Hmm, not always. I've just setup my own mail server, I PASS SPF, DMARC and DKIM according to Gmail headers and yet my email is still classified as spam, as det

Hmm, not always. I've just setup my own mail server, I PASS SPF, DMARC and DKIM according to Gmail headers and yet my email is still classified as spam, as determined by "Gmail magic". I believe this is because the domain is relatively new and Gmail treats you as guilty until you prove your innocence (ie. Enough people mark my emails as not spam)