An SMTP gateway for Apprise notifications - works in tandem with Apprise so that now your applications do not even have to know about apprise in any way.

Simply point them to the mailrise gateway and send an email (which is often natively supported, especially by legacy apps). Mailrise receives it, translates it into something apprise understands and forwards it to Apprise which then does its usual thing and puts it into one of the dozens of programs it supports. Neat!