Hello

After 11th of May update read receipts won't available for new users.

In the idea it is against equality principle. If you bought the app before 11th of May you have a very good feature, but after that day if you bought you won't use this feature. Both users pay same amount for the app but old users have a very good feature which free email apps don't provide.

Also there are tons of email apps in the store and very few of them are not free. If an user purchase an app that app must provide some features which free apps don't provide. And for airmail one of these features were read receipts. But now on if I purchased Airmail app, i will give 5$ and wouldn't use read receipts feature?