Quite a few ISPs block outgoing connections to TCP ports 25 and 465 (to anything other than their own mail server). In a few extreme cases, outgoing connections to TCP 587 are also blocked.
It would be a support nightmare for Hubitat to offer "smtp in the box" when that function can be compromised by factors outside of Hubitat's control.
In any event, if the capacity to send email is essential for your use, use @erktrek's sendmail integration. I've been using it for ~6 months now. Works flawlessly, and I use it for all sorts of things including:
- SMS notifications (via my mobile providers email-to-sms gateway)
- Email notifications
- Logging sensor values (and other things) to google sheets ....
