1-800-882-8880 is the contact number for AAdvantage Customer Service (not the usual reservations numbers). This is who you should call for a missing miles request like this.

That email ([email protected]) is definitely the address that AAdvantage Customer Service will email you from, however YMMV on whether they will respond to an unsolicited request without first contacting them either via phone or the Contact AA section at aa.com.