Bouncing an email sends a message to the email senders' server, which essentially says that your address doesn’t exist. This can be used to prevent your email account getting spammed as spammers will often remove you from an emailing list if your email account doesn’t exist.
To bounce an email, use the following steps:
1. Select the email you’d like to bounce by clicking on it.
2. Click on 'Messages' menu from the Menu Bar and choose ‘Bounce’ as shown below (Shortcut: shift + cmd + B)
3. The bounced email will then be moved to the 'Trash' folder in Airmail.