[brongondwana]

IMAP is an evolving standard still! We've had a handful of new RFCs extending IMAP just this year.

(your FastMail subscription also goes towards paying for work on improving the standards and developing open source software to support them)

[nadont8]

It's cool you spend your time and money doing things you like (regardless of whether those RFCs will be implemented by email servers and clients) but don't make your customers pay for it. Set up donations or something.