You are missing the point. I believe you that some unknown person illegally accessed your gmail account and deleted messages sent to and received from AirBnB. T

You are missing the point. I believe you that some unknown person illegally accessed your gmail account and deleted messages sent to and received from AirBnB. The thing to realize is AirBnB would not hack your account, instead they would simply not send you a message in the first place. The person who has motivation to hack your gmail account, delete messages to/from AirBnB, and most likely forge messages from "you" to AirBnB is the host you are disputing.