MTA-STS is Stupid

from blog Kevin Cox's Blog, | ↗ original
SMTP MTA Strict Transport Security has to be one of the most confused RFCs ever published. The goal is to allow SMTP receivers to inform senders that fully validated TLS should be used. I implemented it for my domain years ago but didn’t think too much of it. But now I am going to implement it for FeedMail and am realizing how poorly designed it...