I get a lot of emails and in practice very rarely reply, which I feel bad about. The more specific your message is and easier to reply to, the more likely I am to do so. If you're writing to pitch me your company, please read my article on how I angel invest first. Similarly, if you're asking for startup advice, please see my article on advice for prospective startup founders before writing. I do especially try to respond to questions from students, but the more specific you can be, the more likely I am to have something for you. You can find my PGP key here (58EC0CD4), but please don't use it unless you know you have a specific reason to do so.
General requests: public@maxhodak.com
Media (for any topic): press@science.xyz