Could I just attach @delta to my existing Postfix+Dovecot server and get the same features as the chatmail servers (aside from push notifications, I guess)? 
#Deltachat
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in reply to Doughnut Lollipop 【記録係】 • • •You can just use @delta with your existing Postfix+Dovecot server by clicking "Create new profile" -> "Use other server" -> "Classic E-Mail login" and logging into your server there.
There are not that many features offered by chatmail on top of Postfix+Dovecot:
- Patch removing half a second delay from Dovecot: github.com/dovecot/core/pull/2…
- Strict DKIM signature checking
- The ability to create an account via QR code
- Filter to prevent sending unencrypted messages
- push notifications
storage: remove 500 ms debounce on IMAP IDLE notifications by link2xt · Pull Request #216 · dovecot/core
GitHub