Arpa.dev has now been updated to the latest stable version!
There are some great fixes and additions in this release, so check out the changelogs[1][2] for all the juicy details. Additionally, now that lemmy.ml is no longer on 0.17.4, federation is greatly improved with their instance.
Outgoing email is also now fixed after a brief post-upgrade outage. There was an issue with the postfix-relay config which has now been resolved, and I also configured a new SPF record for the domain.
For those interested, we're currently using SendGrid as a relayhost instead of opening port 25 for SMTP directly on the VPS.
If anybody attempted to sign up during the brief email outage, you may need to try again. Feel free to contact me on matrix if you're having any issues.