On Wed, Jul 14, 2021 at 02:51:25PM +1000, raf <post...@raf.org> wrote:
> On Tue, Jul 13, 2021 at 10:35:15PM -0400, Bill Cole > <postfixlists-070...@billmail.scconsult.com> wrote: > > > On 2021-07-13 at 21:18:46 UTC-0400 (Wed, 14 Jul 2021 11:18:46 +1000) > > raf <post...@raf.org> > > is rumored to have said: > > > > > I'm beginning to think that DKIM headers might be > > > getting added just to improve spam detection scores. > > > Perhaps I'm getting too cynical. :-) > > > > That would not be very effective. > > > > For example: in Apache SpamAssassin, the presence of a valid DKIM signature > > has a net zero score. If it is valid and aligns with both the envelope > > sender and the From header address, it can net only -0.2 in a scoring system > > with a standard spam threshold of 5.0. That's not quite a meaningless > > benefit, but it is not substantial. It seems that there are corporate mail services that operate differently (well, at least one). According to this: https://postmarkapp.com/blog/proof-dkim-and-senderid-improve-delivery DKIM can mean the difference between mail being put in the Junk folder or the Inbox (when there's a PDF attachment). It might be to help services like mailchimp. I've received mail From: gmail.com with a mailchimpapp.net DKIM signing domain (so really sent by mailchimp). cheers, raf
