It may be me, or Reddit could be flaking out, but it appears that everyone except you and I have deleted their comments. I also cannot reply to your comment about N8N, so I am commenting again. Weird…
I recommended Pushover in my previous comment. To address your initial question, I’m running Docker containers for Mailrise, which provides an SMTP gateway that embeds Apprise code, and also Apprise standalone. I use Mailrise for services that support only SMTP notifications (e.g. Proxmox). Mailrise translates an email message and, using Apprise code, submits it to Pushover. I use Apprise standalone for receiving notifications from Healthchecks, which monitors cron jobs. Healthchecks supports a number of notification services, but standalone Apprise was the best fit for me.
As I understand, Apprise has its own light-weight HTML API for creating and configuring notification endpoints. It can create a webhook endpoint, but I don’t believe it receives messages as webhooks.
Like me, you probably will need multiple services. I tossed up an N8N container out of curiosity. It can accept a webhook and then act on it. It also supports Pushover. So, it looks like a webhook to N8N can be translated to a Pushover notification. Using Mailrise (for SMTP messages) along with N8N (for webhook and other messages) should provide the extensibility you’re looking for.
Again, I highly recommend Pushover. Receiving notifications from many different sources, that are organized into “applications” with their own icons, in one mobile app is a tremendous benefit… to me anyway.
I use Homepage. There are plenty of other options, but I prefer Homepage because of it’s speed and simplicity. Many landing page apps allow for customizing on the page itself. Homepage is configured using YAML files, and therefore static, so family members will not be able to make changes, or accidentally break it, once you have it set up.
Here is a screenshot of my… Homepage.
I use custom images and icons uploaded to Dropbox in… icons-72x72-png.zip
These are kept in volumes for persistence…