2 years ago

Category: Docker

There is a couple of email addresses one should have configured from day 0 for any internet domain to ensure it complies with the best practices. As per RFC 5321, any errors during the processing of email should be directed to the postmaster@ email address, and as per RFC 2142, any abusive actions, such as spamming, should be reported to the abuse@ email address. I often configure those administrative role accounts simply as a Postfix redirects to some service mailbox e.g. in GMail, using the following configuration script (along with my Postfix Docker image): However, if GMail does not accept an incoming email message, Postfix will respond to the sender with the bounce message in the following format: As you can see, Postfix has expanded and disclosed the mailbox behind the administrative role account.

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