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Apache James
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<p>Apache James (Java Apache Mail Enterprise Server) is an <a href="/facts/Open-source_software/HzTaB8E9">open-source</a>, enterprise-grade <a href="/facts/Mail_server/9SJG5sbb">mail server</a> written entirely in <a href="/facts/Java_(programming_language)/9ScgFyAL">Java</a>. It provides a complete email solution supporting <a href="/facts/Simple_Mail_Transfer_Protocol/TeCRKDpJ">SMTP</a>, <a href="/facts/Post_Office_Protocol/QCp6qJQm">POP3</a>, <a href="/facts/Internet_Message_Access_Protocol/QMnyvUwk">IMAP</a>, and <a href="/facts/JMAP/RpwsjyuA">JMAP</a> protocols, along with advanced features such as custom mail processing, distributed deployments, and cloud-native architectures. The server is maintained by the <a href="/facts/Apache_Software_Foundation/Xl9Tt9lE">Apache Software Foundation</a> and is used in production environments ranging from small businesses to government-scale deployments serving millions of users. </p>