Sieve: adding Date: header when missing

[Jiri Bourek]

On 17.7.2014 16:40, Jochen Bern wrote:
> On -10.01.-28163 20:59, Daniele Nicolodi wrote:
>> 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.
>
> RFC 5322 3.6. (and AFAIK *all* its predecessors) marks the Date: header
> as mandatory. sendmail used to forcibly add one if missing, I'm not sure
> about other MTAs (and MSAs). I'ld recommend to try fixing the problem as
> early and globally as possible, rather than on the last yard into *one
> specific* mailbox.
>
> Regards,
> 								J. Bern
>

Postfix is able to add the header, if you configure it do so. According 
to its documentation "this may break DKIM signatures that cover 
non-existent headers", so it's off by default.

(More in man 5 postconf - always_add_missing_headers.)