There are several steps steps:
- Go to the Settings
- In the Forwarding and POP/IMAP, click on Add forwarding address (make sure you select to keep a copy in your inbox)
- Go back to your inbox to get the verification code sent to you via email
- In the Settings > Forwarding and POP/IMAP, confirm the transfer thanks to the code
- In the Filters and Blocked addresses tab, click on Create a new filter
From @airbnb.com, and click on Create filter
Forward to and select the forwarding email address added before.