For operators running email at real scale, WildDuck moves accounts and messages into MongoDB and scales by adding stateless servers behind a load balancer. Any standard mail app connects over IMAP with IDLE push, CONDSTORE sync, compression, quota reporting, and special-use folders, or over POP3 for simple download-and-delete reading. International addresses and folder names work natively, so mailboxes written in Cyrillic, Arabic, or Chinese scripts are first-class citizens rather than encoding errors. Everything an operator touches is an API call: create users, set quotas, edit filters and auto-replies, publish DKIM keys, read audit logs, and move messages between mailboxes without editing a config file. Accounts defend themselves with two-factor authentication by authenticator app or security key, application passwords for older clients, and optional PGP encryption of stored mail. Pair it with Haraka to receive SMTP mail and ZoneMTA to send it, and the three services form a complete mail platform with no single point of failure. Attachments spill into GridFS or S3 storage and Redis keeps sessions and queues moving, so a failed node interrupts nothing that a replica cannot resume. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. EUPL-1.2 licensed.