Right, we are actually fixing notification for the next release (6.3). In the meantime, Domains -> Renew all certs and then check the logs (button on the same page) if it fails. Usually, Let's Encrypt errors are temporary and currently Cloudron is a bit overzealous reporting those errors.
For reference, Haraka has a greylisting function built in: http://haraka.github.io/plugins/greylist/ - and it works with the DNSWL / whitelist which we should enable too. That way if an IP is on the DNSWL, it automatically skips any greylisting attributes.
@girish I think the issue with MySQL Workbench is I can't use the latest version as they don't support macOS 10.14 past a certain version, and a colleague on a later macOS can get it working on a later MySQL Workbench version but I can't update my OS at the moment until some other software I use is updated to work with the later OS. Classic catch-22 on that one.
I think the solution to this should just be to use DBeaver, it's free on all platforms, and seems to work on all OS versions. too.
Maybe better to save your time for the odd additional /phpmyadmin/ that might be useful on certain apps.
Certainly appreciate the help and looking, but I don't want to distract you too much given it's a software version compatibility issue and not a Cloudron issue really. Thank you all the same though!!
@bestknownhost for a start to clarify, are you using an external backup storage or just the local disk for now? Using the local disk may cause disk usage to go up quickly depending on how much data you've put into the server.