Obligatory links:
https://github.com/brong/cyrus-imapd/tree/fastmail http://jmap.io/
Presently it's just Postfix and Dovecot on the physically-owned server and Thunderbird and K9 Mail on desktop and mobile. Quite old-fashioned.
I had seen links to some fastmail support branch for cyrus and some jmap.io, but didn't really get what thase are and all on Fastmail's website suggests it's a service, not software. But maybe I had missed something.
So... is it for me or not?
(I have been my own SMTP server (hosted by OVH) for a few months now. I was blocked exactly once, by custom filtering from a small provider where the delivery status notification said to appeal to abuse@, I emailed them and they fixed it in minutes.)
What will happen? More people will block small providers because fewer exists? The issue is much larger than that. There need to be better ways to deal with email than just dropping it for arbitrary reasons.
> I was blocked exactly once
... that you know of
I've worked for companies where our internal mail servers just couldn't email some people; we presume their ISP black listed us and never published it on a shared list. (We only know this because people would call because they never got the email with the link to their purchased item.)
I do not have the time to worry about if every email I send will get delivered. Many systems don't send you a status notification; they just accept and then drop the message, meaning you may not see an error in the logs. You may not show up on public black lists for days. That's not something I want to be sinking my time into. I'd rather pay someone to run a well-known service that is very unlikely to have delivery issues.
(From my experience, I have never witnessed a situation where an email I had sent to someone had silently been ignored.)
http://serverfault.com/questions/364132/postfix-says-mail-se...
(Also, the mail was sent from www-data, which I think was an acceptable clue to classify the message as spam no matter from which server it came from.)
Unless people want to get syndicalist/cooperative with their email, they'll go with the large free email providers.