On Sat, Apr 09, 2016 at 08:32:10PM -0700, li...@lazygranch.com wrote:
> One interesting take away is that the corporate email servers were less
> likely to have SPF and DKIM in use. On the weekends, more email was sent
> from home users who tended to use Google, Hotmail, etc., which did use
> SPF and DKIM.
I suspect that's not the whole story, if you look at the weekend
peaks and troughs before Gmail started displaying a transport security
indication for delivered mail, you'll see that the gap between the
two was much higher than it is now. You'll also notice that the
mainstream senders of bulk email marketing who are always in the
top 20 senders on the transparency page recently went from 0% TLS
to 100% TLS.
So my take on the numbers is that the commercial mailers make up
a larger proportion of email traffic into Gmail on weekdays than
on weekends. If it was just or predominantly the difference between
corporate and home senders, the size of the weekday dip would not
have changed, just the baseline would have moved up. The corporate
world does not react to changes of Gmail's user interface within
days of those changes. Only the professional email marketers are
that agile.
--
Viktor.
