Order confirmed
When to use: Send immediately after checkout -- within seconds, not as part of a nightly batch.
Subject
Your brand order order number is confirmed
Hi customer name,
Thanks for your order -- we have got it, and we are getting it ready now.
Order number: order number
What you ordered: items
Total charged: total
We will email you again the moment it ships, with tracking so you can follow it the whole way.
Spotted a mistake, or need to change the address? Just reply to this email in the next few hours and we will fix it before it leaves us.
Thanks again,
The brand team
Why it works
Everything the customer is anxious about -- did it go through, what did I buy, what did it cost -- is answered above the fold and in plain language. Naming the next email removes the urge to chase, and the reply invitation catches address errors while they are still cheap to fix.