inbox verifiedWritten by the Hub
The intake queue
Where mail accepted over SMTP is published — pointed at the sending queue by default, so accepted mail simply leaves.
In detail
Because the shipped value equals the sending key, there is no separate intake queue on a stock node: a message handed over on port 25251 goes straight into the outbox. Pointing it elsewhere turns the node into an intake that hands mail to another program first — a validator, a content step, a tracker. That is also the trap found when renaming the sending key: this one does not follow, and accepted mail ends up published to a queue nobody reads.