[untog]

At a very high level, email is primarily used for discussions.

I guess it depends on what you mean by "primarily" but my inbox is overwhelmingly notifications and announcements, not discussions. There's remarkably little of my inbox dedicated to actually talking to people.

[tmail21]

You are right. There is a mix of notifications and discussions with the mix varying between the two based on the nature of user's communication. In more collaborative scenarios, it may be 80%-20% discussion-notification. In other scenarios the ratio may be reversed.

On the pure notification front, we have friendly tracking numbers (so that notifications can be referred to from other places like spreadsheets, chat, apps, voice etc.). These tracking numbers look something like 124-1234-1234. We also support Certified Mail, Certified Forwards, Certified Read Acks etc.

Having said this, we currently support outbound notifications (from TMail to TMail/EMail). On the inbound side we support TMail to TMail. We do not currently support EMail to TMail notifications although we may add this if we see sufficient demand.