this post was submitted on 26 Apr 2025
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@[email protected] This doesn't involve security. This is just about a protocol that says a server must let you know, via one email for each rejection, that an email with your from address couldn't be delivered, regardless of whether you sent it.
It's a procedural problem.
If a spammer sends 5 million emails with your email address in the FROM: then you can expect hundreds of thousands of messages from your email provider telling you that it couldn't deliver an email, for whatever reason.
Here. Let Google explain it: https://support.google.com/mail/thread/209018675/my-sent-email-box-is-filling-up-with-bounce-emails-and-emails-i-did-not-send-my-inbox-is-fine?hl=en