I just started using Jmap because of ThunderMail (not Thunderbird), but I really like that server.
@andreasdueren I think having an additional mail server app would be great, but the actual mail server is perfectly integrated into Cloudron itself. Nice find!
If this server becomes more stable (see the breaking changes when updating: https://github.com/stalwartlabs/stalwart/blob/main/UPGRADING/v0_15.md), it could be a very nice drop-in replacement for the internal mail server as long as the licence (https://github.com/stalwartlabs/stalwart?tab=readme-ov-file#license) fits. However, reading the 'Enterprise' options (https://stalw.art/enterprise/), it may not be suitable because 'Multi-Tenant' is an 'Enterprise' feature.
If I find some time, I can do some tests and post the results here, but that's low priority.
I think it's complicated to document what the hacks are but it's all inside 




