Basecamp co-founder and CTO David Heinemeier launched a new email service Hey.com earlier this week that allows one to have a two-letter email address for $999/year or a three-letter one for $375/year. A four-letter or slightly longer email address will cost users $99/year. The service has run into early troubles as Apple has threatened to remove the Hey.com app from the App Store if the company does not add IAP to it. This will ensure that Apple gets a slice of the revenue generated by the app through IAPs.