To my knowledge, I have never created an app in the amazon appstore. (They have an app store?)
@jpsays looks like a phishing attempt.

@jmorris It does! It was actually signed for appstore.amazon.com at least.

DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; d=appstore.amazon.com; b=rQ23flN95M0H8YjGhFyxGgGy1Z+2/s3+rQRj4pNIN0kFEmp8vgcmNNS6ZMgqR/Cr 2fG8mDKbDIOFrZ/rtlHXLPtuIfNekUtvGD9jpFPUK7OOGXu6TwRELdwVyeNhwurRooQ ADqI18qHNECISzCNLG2+um0BfmRRRjulL6r4aUQJTJRxq28sMiarCWvwr8oZMb9hE1d MSOtGrjdrg64H71RVp4e9zysw/Jiu3/zbSLZq36j9HUrvKApaYmrZOs9Hes0TnGzIWX pSJNUosRw2mSoamg2XAnAWExMISbWTIDhUqtfANb1jvC8u284uununxwzWpnPvfhukN fV53O1QEhA==