This is all you really need to know in order to make Action Mailbox work in development.
- Fire up
ngrok http 3000
and make note of your subdomain for steps 3 and 8. - Create a Mailgun account because they offer sandbox addresses; grab your domain from the Dashboard.
- Go into Receiving and create a catch-all route pointing to:
https://XXX.ngrok.io/rails/action_mailbox/mailgun/inbound_emails/mime
- Add your Mailgun API key to your credentials:
action_mailbox:
mailgun_api_key: API KEY HERE