You can customize notification emails, such as the task notification or daily task summary emails. You need to provide mail standard processes within an Axon Ivy project to do so.
You can see how you can do that in the following demo:
https://market.axonivy.com/custom-mail-demo
If you would like to test this feature directly on an actual Axon Ivy Engine, have a quick look at this new docker sample:
https://github.com/axonivy/docker-samples/tree/master/ivy-mail