Awesome

piler is an open source email archival application. Please visit https://www.mailpiler.org/ for more.

Features:

• built-in smtp server
• archival rules
• retention rules
• legal hold
• message and attachment deduplication
• message compression
• message encryption
• digital fingerprinting and verification
• full text search
• simple and expert search
• save search criteria
• tagging emails
• view, export, restore emails
• bulk import/export messages
• access control
• AD / LDAP authentication
• IMAP, POP3 authentication
• single sign-on (SSO)
• Google Apps support
• Office 365 support
• STARTTLS support
• Google Authenticator support for 2-factor authentication
• i18n
• customisable theme
• audit logs
• search in audit logs
• online status info
• accounting
• recognised formats: PST, EML, Maildir, mailbox