Re:Show HN: A self-hosted email engine
by upofadown on Thursday January 30, 2020 @01:09PM
(#22193645)
My current impression is that Gmail is sort of broken in general. There isn't really anything you can do to insure that an email will get delivered to Gmail with 100% certainty.
Presumably people who actually care would not be on a free email service in the first place...
> DKIM, SPF, DMARC are all properly set up.
Does the IPv6 address have matching forward/reverse DNS?
Re:Show HN: A self-hosted email engine
by sam_lowry_ on Thursday January 30, 2020 @03:25PM
(#22195148)
Yes
I have a mail server for personal use, and I send less than 10 mails per day for many years. DKIM, SPF, DMARC are all properly set up. I am signed up to all possible postmaster tools, including that of Google.
Still, Google started blocking mail sent from my IPv6 address in December. I switched to IPv4, and it fixed the issues for existing gmail recipients, but new recipients usually see my mail in Spam. When I don't get a reply for a few days, I mail them from my backup @gmail.com account and ask to unmark me as spam and add to contacts. So far, this helps.
P.S. I also run a community website on a different domain and IP. It sends tens of thousands of notification emails per month, and it fares better in Google Postmaster Tools. User-reported spam is within 1% and it seems that this is acceptable behaviour for Google.