Over the last 6-12 months, one of our employees Bron Gondwana has put a lot of effort into improving our IMAP/POP server, which is the open source cyrus IMAP server. Most of the improvements were rolled out to FastMail customers a few months ago and documented in this blog post.

Today however marks the official release of cyrus
2.4, which includes all of Bron’s changes and numerous other improvements from other contributors. Congratulations everyone involved with the cyrus project!