Dkim (my blog) is not perfect but makes stiff harder to emulate. Its implementation by others is sad and while yes it is valid and works it is nominal.
Dmarc reports (my blog) are great,its remote reporting so i know what your doing with our domain name.
Tls support in email is another thing on the up. Oh well we have it (my blog). However if your a spammer (my blog) then it shows that your still an idiot enveloping spam in tls still means its not going to be seen by a human who will only know x spams where deleted when the server script was last run at the beginning of the month.