Double Precision is a software development company known for creating the Courier Mail Server, an integrated mail/groupware server based on open standards such as ESMTP, IMAP, POP3, LDAP, SSL, and HTTP. The Courier Mail Server is designed to be fast, efficient, and secure, supporting enterprise-level email system functionalities. Double Precision provides comprehensive documentation and resources on the official website, http://courier-mta.org, to assist users in deploying and managing their Courier servers.