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From: Alex Musolino <alex@musolino.id.au>
Date: Mon, 31 Aug 2020 10:49:39 +0930
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Subject: Re: [9front] Smtp greylist possible missing feature?
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X-Bullshit: mobile injection hardware-aware generator 

> At least that's what it seems like.

Sounds plausible.  Have a look in qer(8); there's an example cron
job at the bottom for periodically (re-)processing the mail queues.