Mailgun delivery status messages
posted by dennisn on March 18th, 2020 at 2:38PM

By default, Mailgun's (a cool email service) routing system discards delivery status messages, eg. "Invalid recipient" messages from people who have changed their email addresses. To have such messages actually reach you, you need to setup a custom route, with the following match magic:

match_recipient(".*@mydomain.com", dsn=True)

https://mailgun.com

Link