STEPS :
1) Firs Go To Here
2) Enter Victim Profile id And Get Numeric Code.
3) Login To Your Email Account Or You Can Also Use disposable Mail.
4) Compose New Email
To : victim's Numeric fb id@facebook.com
Message : Type Your Content
5) Victim Receives Your message on their email inbox (by your email id).
6) When He/She Reply You can view their Email Address.