Sieve: adding Date: header when missing

[Daniele Nicolodi]

Hello,

there is a way with a sieve rule to add a Date: header when it is
missing?  Adding one with the time of reception of the message or using
the date from the the first Received: header would be good options.

Unfortunately I'm receiving some useful automated messages that lack a
Date header and this screws up the sorting in my imap clients.  I have a
script to fix those acting on the Maildir storage, but I would prefer to
have the thing solved more radically.

Thanks. Cheers,
Daniele