I generally prefer email for everything. You may not like it, but just about everyone on earth has an email address and there's no central authority dictating who can have one or what they can send or receive with it. I stick to RFC 2142 suggested mailbox names when feasible.

If you know how to use PGP, I make my GPG public key available. If not, don't worry too much.
If you need help with my software or services, don't hesitate to reach out. I can't promise I can fix it, but I'll see what I can do.
For any complaint about the behaviour of my software or services. This includes legal complaints including copyright claims like American DMCA Takedown Notices.
For security issues found. More details on things like bug bounties and my hall of fame for findings are in the security page.
For privacy concerns or questions. You can always learn how little I want to be a creep by reading my rather short privacy policy.
For matters related to the website itself including content, accessibility, functionality, bugs, or to explain why I'm wrong about something.
For matters relating to my email server and the email it sends. If you think I'm spamming you, that's better handled through
For any matter related to my DNS hosting and records.
For any matter related to my network infrastructure, servers, or any other technical matter not covered by the above mailboxes.
Send email here to automatically get banned to my spam folder.
For information about purchasing.
For marketing materials or inquiries from the press.
For work related matters including to reach out about potential job offers.
If you really want to send me money for some reason.