Thank you, I was reading https://github.com/monal-im/Monal/wiki/Considerations-for-XM... and misread the requirements, 0.13 is required for SASL2, not for cloud_notify.

I really like Prosody because it was trivial to reuse the same user store I use for Postfix/Dovecot so every email account gets an XMPP account automatically.