A server that sends, receives, and stores email messages using SMTP, POP3, or IMAP protocols. Mail servers are the infrastructure backbone of email — they handle routing, authentication, and delivery across the internet. Your domain's MX record points to your mail server, telling the world where to deliver mail for your address. Common setups: self-hosted (full control, full responsibility), third-party providers like ProtonMail or Tutanota (convenience, their jurisdiction), or managed hosting (middle ground). For bulletproof domains, mail server choice matters more than domain registration itself. A .onion domain is worthless if your mail provider logs traffic or cooperates with authorities. Similarly, registering anonymously at bunkerdomains means nothing if your mail sits on a US-based server. Offshore hosting providers and privacy-first mail services (Posteo, Migadu) pair better with offshore TLDs. Self-hosted mail requires technical chops: SPF/DKIM/DMARC records prevent spoofing, but one misconfiguration or IP blacklist destroys deliverability. Bulletproof operators often use mail servers in jurisdictions with weak disclosure laws and pair them with .ch, .is, or .md domains.
hosting
mail server
Server that routes and stores email using DNS MX records; your mail provider matters more than your registrar.