feature request: caching message arrival time

[Örjan Ekeberg]

Daniel Kahn Gillmor <dkg at fifthhorseman.net> writes:

> So Autocrypt defines the "effective date" of a message as the *earliest*
> of two dates: the date that the message is first seen, and the Date:
> header itself.  So we want our augmented Autocrypt header ingestion
> routine to search for all other messages we know about from the sender
> that have both a later firstseen= property *and* a later Date: header.

Would it be possible to use the earliest date seen in any of the
Received: headers as a safeguard against future-dated messages?

/Örjan