How can I configure Email notification in Enterprise Manager CA APM SaaS version?
See Create Notifications for Alerts - CA Digital Experience Insights Application Performance Management - CA Technologies Do…
It talks about using PagerDuty to do what you want.
There's a plan to provide their own smtp email gateway or service to send emails without use 3 party companies?
That is a product management question. But not that I am aware of at this time.