jmap-demo-webmail VS smtp-server

Only servers I'm aware of that support JMAP are Cyrus and James. Clients do seem to be thin on the ground right now, with https://github.com/jmapio/jmap-demo-webmail still being the one to use (as far as I know).

Amazing stuff. Is there a JMAP-powered webmail you'd suggest to test everything with? I could only find a demo application from Fastmail.

PEM issues for the TLS certificate or DKIM signature? In any case feel free to describe the problem in the discussions page and I'll check it out.

I am happy to announce Stalwart SMTP, a modern SMTP server developed in Rust with a focus on security, speed, and extensive configurability. It features built-in DMARC, DKIM, SPF and ARC support for message authentication, strong transport security through DANE, MTA-STS and SMTP TLS reporting, and offers great flexibility and customization thanks to its dynamic configuration rules and native support for Sieve scripts. The project has been recently awarded a grant from NLNet and the European Commission's Next Generation Internet program to develop a mail server in Rust. The next step in the roadmap is to refactor the code base of the previously released Stalwart JMAP/IMAP servers and to create an integrated mail server solution that is simple to install and manage. Any comments or suggestions are more than welcome!