Github Action failure notification emails blocked by gmail

We use Github Actions to send an email to dynamorio-devs when there's some CI failure on master merges. We use the dawidd6/action-send-mail@v2 (https://github.com/dawidd6/action-send-mail) action for this.

This is failing frequently recently: last 6/10 CI failures weren't able to send the notification email.

This is because gmail thinks it is a suspicious sign-in attempt and blocks it. Despite marking it as a known login attempt multiple times, it continues to get blocked.

https://github.com/dawidd6/action-send-mail/issues/17 discusses using generated app password + two-step verification for gmail account. Maybe that'll help -- only way would be to try.