Earlier quoted context omitted.
In my experience struggling to deliver email from my self-hosted server, Gmail's by far the worst. Not that I haven't had the occasional issue with Yahoo, Outlook and AOL. But here's the key difference: Yahoo, Outlook and AOL actually offer tools to resolve the issue! For small senders like me who fall below Gmail's postmaster tools limits, we have no recourse other than trying to find some sympathetic Google employe…
If you actually are looking for advice, then in descending importance order: * Enforce a DMARC policy instead of explicitly disabling it. * Enforce a strict SPF policy instead of ~all. * Send over IPv6. Usually stricter rules are applied and not-up-to-snuff emails are rejected at the SMTP level. * Your provider hosts lots of spammers for their size. Consider switching. * Enable MTA-STS. The first two I'd consider obv…
No arguments about my provider. Any tips on how to select a better one? I'm thinking someone who adds some friction to unblocking outbound port 25, e.g. Vultr, might be better.