Gmail Will Warn If Message Is Not Authenticated/Encrypted
This sounds great but Google has been making it harder and harder to run your own mail server even for personal use.  I think they would be happy of email servers were only run by a few large companies.  They make it sound like they are doing the right thing but really they are bully the industry to do it their way.  So many people have Gmail accounts that you can't run an email server that cannot send email to Google.I've run my own email server for about 15 years.  Every now and then I have to drop everything and implement some new technology that Gmail demands I have.  Granted SPF, DMARC and TLS are all great technologies but I take issue with Google making the decision that everyone is going to switch, now and with out sufficient warning.