On Fri, Jan 26, 2018 at 6:32 PM, Michal Suchánek <msuchanek@xxxxxxx> wrote: > This is wrong because the message will most likely not get delivered > when the author date differs from current time. Others have covered other bases here, but I just wanted to ask about this. Are there really mail setups that refuse to deliver or accept messages whose Date headers don't match what the expect? I would think that such issues wouldn't be present in the wild since SMTP daemons need to deal with messages that are e.g. held locally somewhere, or the only make it to your server days afterwards due to your own downtime + client retries. Now if by "not get delivered" you mean they'll show up on the Nth page of your mailer because it sorts by the Date header, sure. That's a problem and quite common, tricky to solve due to the issues others have noted though.
