Shutbox

What Shutbox is

Shutbox is a private email service currently in beta, with a web inbox that includes folders, labels, conversations, and search. Users can bring a custom domain or start with an @shutbox.im address and use aliases. For messages between Shutbox accounts, bodies and attachments are encrypted on the sending device for each recipient. When sending to other providers, a delivery bridge decrypts mail in memory for transmission; sender, recipient, and timestamp metadata remain unencrypted. Account security options include OPAQUE authentication, optional TOTP two-factor authentication, and WebAuthn passkeys. An API using JSON over HTTPS is available, with API-key creation on paid plans. Shutbox supplies MX, SPF, DKIM, and DMARC records for DNS setup. If storage exceeds the account quota, outbound sending is suspended, while inbound mail continues through a 30-day grace period. The free plan is $0 forever and includes 512 MB storage, one custom domain, two aliases, and 50 outbound emails per day. Pro costs $1.99 a month and Business costs $4.99 a month. Mail and account data are stored in Nuremberg, Germany, with encrypted database backups in Germany.