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