It depends, I mean my domains are behind a lot of obfuscations and stuff but. Main thing is however security and email privacy not anonymity. For that I use other solutions. Email should be avoided as much as possible all together if anonymity is the goal. Email for me when I want people to know who I am. Also nice to use yourstupidnewsletter@mydomain.ml and if there is an issue just block that one. And I know where the leak is if I get spam.