[turkeywelder]

We send a "weekly summary" email of who is absent in your company in the next week.

At 9am on a Monday we send roughly 100k emails via Sendgrid and have very very low spam report rates. Transactional email for even relatively small SaaS companies can get high very quickly.

As much as us in the dev world rely on Slack and try to avoid notification overload, my experience is most people want things as an email.