[vishaldpatel]

Remember folks, every single piece of correspondence we send should be valuable to the receiver.

Welcome email? Great - tell them something that will help them to get setup.

Referral email? Great - tell them how they can win by referring you, and I mean really win.

Promotional email? Make sure that promo is worth their while.

And never take your audience's time for granted. You're trying to build a relationship.

[tabio]

I notice that your examples don't include the "'begging for re-engagement from someone who doesn't need to use your app' email"

[robwormald]

I call these the "reminder to actually cancel/close my account" emails.

[mrmch]

This is the PERFECT attitude to email. Companies that do this really well (AirBnb for ex), their emails look and feel just like their website, and always focus on highlighting the relevant information.