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    After changing the DMARC policy from “none” to “quarantine”, I learned the hard way that Gmail makes it fail when you use it to send emails through SMTP over TLS (Settings -> Accounts and Imports -> Send mail as, “Treat as an alias” enabled by default), then it puts it in the spam folder on the receiver’s side.

    Turns out that the “alias” setting is actually Gmail changing the Return-Path from the selected email to the Gmail account’s default email, which makes DMARC fail validation.

    One of the main advantages of email is that itʼs a truly open messaging system. Anyone in the world can set up an email system and communicate with any other email system in the world. Itʼs not a walled garden controlled by a single company or website.

    Sure, you just need to jump through more and more hoops to get your mail server to be accepted by the email oligopoly. Then they throttle you for having forwarding set up to your own account on one of their systems. Apparently, forwarded spam marks the forwarder as a spammer. POP3 fetching from inside the walled garden still works.