Relatedly, for the benefit of the team here, I'm a ghostwriter for some of the content at HostingAdvice.com. I've nominated Cloudron as a potential future feature article, and the staff there added y'all to the list of companies to research for future interviews. (And if they conduct one, I'll end up doing the write-up.) HA gets pretty decent traffic from a CIO perspective, so here's hoping that Cloudron comes up on the list sometime soon.
Gaah, sorry for the long-delayed follow up. I blame the ... oh, look, a squirrel. 
After server and Cloudron restarts, the problem persists. Email works just fine, and the email service is active and well within memory limits. I even tried a DNS resync, and a quick scan of the email logs does not suggest that anything is amiss. But when I access the Email option from the control panel menu -- regardless of the domain -- all I see is a spinning ring.
Step 1: Click the wrench of any domain:
Step 2: Get the spinny donut:
The grey- and red-dotted domains are doing what they should; one is expired and will eventually be deleted, and the other has no email service through the Cloudron instance. Everything else is green, and works -- no problems with sending and receiving. I just can't enable/disable email for a new domain or configure email on a per-domain basis.
Any insight?
Many thanks for the prompt assist -- all is now well in the world.
@nebulon
Here's what I see with devtools active:
The domain jegillikin.com does NOT have mail configured, by design -- I use Microsoft 365 for email services. It's focused on that domain even when I click the pencil icon for a different domain.
I'm currently on 6.3.4 on Ubuntu 18.04.4 LTS, and my subscription is active.
@girish Come to think of it, I didn't try to delete it, but one of the domains is no longer active in DNS and I removed it entirely from Digital Ocean, but I never bothered to remove it from Cloudron. So I suppose the API is calling nothing. Would that make a difference?
Many thanks for the prompt assist -- all is now well in the world.
@nebulon Sure -- enabled, and email sent. Thanks!
@scooke Thanks for the thoughts!
I'm wondering, based on those 404s, whether I need to re-provision the API key into Digital Ocean for one of those domains. Hmm.
@nebulon
Here's what I see with devtools active:
The domain jegillikin.com does NOT have mail configured, by design -- I use Microsoft 365 for email services. It's focused on that domain even when I click the pencil icon for a different domain.
I'm currently on 6.3.4 on Ubuntu 18.04.4 LTS, and my subscription is active.
@d19dotca Neither Edge nor Chrome nor Firefox nor Opera ...
It simply isn't working, and nothing in the logs explains why.
Gaah, sorry for the long-delayed follow up. I blame the ... oh, look, a squirrel.
After server and Cloudron restarts, the problem persists. Email works just fine, and the email service is active and well within memory limits. I even tried a DNS resync, and a quick scan of the email logs does not suggest that anything is amiss. But when I access the Email option from the control panel menu -- regardless of the domain -- all I see is a spinning ring.
Step 1: Click the wrench of any domain:
Step 2: Get the spinny donut:
The grey- and red-dotted domains are doing what they should; one is expired and will eventually be deleted, and the other has no email service through the Cloudron instance. Everything else is green, and works -- no problems with sending and receiving. I just can't enable/disable email for a new domain or configure email on a per-domain basis.
Any insight?
I've been trying to add an email address, but from the control panel, when I go to the Email menu, I can't edit any of the email settings for any of my associated domains. I can see all eight domains, and I can send a test message from any of them, but clicking the pencil icon to edit them just sends me to a page with a spinning ring that never resolves.
Anyone have advice on how to fix this problem?
(Yes, I've already tried rebooting the Cloudron server.)