[daneel_w]

In my experience they will mark your e-mails as spam for no sound reason at all. I run my own MX, for myself personally, and my e-mails to friends using Gmail regularly gets classed as spam as soon as it's been "long enough" since my last mail. My MX does everything by the books, ticks all the boxes, never ended up on any DNSBL etc. Their behavior is effectively a form of systemic sabotage.

[igor47]

Yes absolutely this. I've put so much effort into making sure I tick all the boxes and yet I constantly wonder if my email is getting delivered. This feels anti competitive to me. It's Google constantly telling me, give up, you know deep down you should just use Gmail.

[nickff]

I think Gmail doesn’t want you to use their service for sending email; they want you to have to advertise ‘with’ them.

[iririririr]

we switched email providers from our all-EU stack to gmail... just as a last desperate attempt at not being marked as spam for actually sending low volume (crazy, right).

well, now we're stuck with gmail for a year, and no, it haven't improved anything!

[patja]

I've been running my own MX for my business for a couple decades. I've never had trouble with Google. Apple on the other hand...as expected are not accommodating to anyone operating outside of the Apple garden. They don't even do DMARC reports, and just point you at their policy page with no indication of why they reject some mail to icloud addresses but not others. I will say I have received specific feedback from a human at Apple after submitting an email and waiting about a month for a response. But it was shocking in how braindead and years-out-of-date their reason was for blocking some (not all!) emails from our domain.

Actually the absolute worst are the rinky dink "free email" hosting that is bundled with some cheap web hosting services, where they use the UCEPROTECT block lists. UCEPROTECT is basically a protection racket where they expect you to pay to be removed from their blocklists, and they are often the one and only blocklist a domain or IP will appear on (which indicates it is likely a false positive money grab)