This does suck, but you can actually use From: aliases if you set them up first in the Gmail interface. You also have to enable two factor auth. Hard to be too mad about spam fighting measures.
Sounds like I need to update my article. Thanks for this information.
But note that they are still violating the RFPs, if they rewrite headers for people who fail to jump through these hoops. They can implement their spam protections (if that's the purpose) while remaining compliant by rejecting the emails in question.
Nothing. The standard allows you to put anything you want in the From: header. Sometimes I send emails from Santa Claus or God. The envelope information is still there.
But note that they are still violating the RFPs, if they rewrite headers for people who fail to jump through these hoops. They can implement their spam protections (if that's the purpose) while remaining compliant by rejecting the emails in question.