On 9/14/22 10:57, Alessandro Vesely via mailop wrote:
     * Stop blackholing.

That one is the absolute worst of the worst of the worst. Blackholing is something that _MUST NOT_ be done, ever, for whatever reason. There is never and has never been a good reason for blackholing. If you don't like a mail, give it a 5XX error, never accept it. When you have accepted a mail you MUST deliver it.

Even "spam folder" is a bad idea. If it's spam, reject it with 5XX. You can never be sure people will look in the spam folder. And if they do check it, why should it be there in the first place, email could as well land in inbox, that's one less action to take to see your mails.

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