Open Source Alternatives to MailStore Server

An email archiving software for small and medium-sized businesses that creates central copies of emails to ensure data availability and security. The product provides tools for regulatory compliance and GDPR adherence through retention policies, legal hold, and auditing functions. It supports archiving from mailboxes, public folders, email clients, and PST files, and integrates with Microsoft 365 and Google Workspace. Users access archived data via a web interface or a Microsoft Outlook integration, utilizing a full-text search function for retrieval. The software is deployed as a server installation that manages storage without requiring an external database. It includes features such as SHA hash values and AES256 encryption to protect archived data from manipulation and ensures long-term software independence by allowing data exports in standard formats.

Whether you want to cut software costs or escape vendor lock-in, these open source alternatives to MailStore Server give you an option you fully own. You can self-host them, so your data stays on infrastructure you control. This page lists 1 open source alternative to MailStore Server. The most popular is Open Archiver. It uses the AGPL-3.0 license and ships an official Docker image.