The company 'Laboratory MBK' is developing the Tegu mail server, which combines the functions of both SMTP and IMAP servers. To simplify the management of settings, users, storage, and queues, a web interface is provided. The server is written in Go and is distributed under the GPLv3 license. Completed binary builds and extended versions (LDAP/Active Directory authentication, XMPP messenger, CalDav, CardDav, centralized storage in PostgresSQL, fault-tolerant clusters, a set of web clients) are commercially available.
Main Features:
- Proprietary implementation of servers for SMTP and IMAP protocols.
- Delivery of emails to an external server via the LMTP protocol (for example, Dovecot) or to its own maildir storage.
- WEB administration panel.
- Local database of users, groups, and redirects.
- Support for mailbox aliases, redirect lists (mailing lists), mailing groups (groups with an email address that allow sending an email to all members), and nested mailing groups.
- Contents of an unlimited number of mailboxes. domainsFor each domain, one or more user and group databases can be connected.
- Mail master users (those who have access to all mailboxes) are defined by group membership.
- Support for setting quotas on IMAP mailbox sizes.
- Support for whitelists and blacklists of senders for incoming emails.
- Support for SPF for domain verification of the sender.
- Support for GreyList technology (temporary denial to unknown senders).
- Support for DNSBL (allows refusal of service to senders based on known compromised address databases).
- Ability to check for viruses and spam using the Milter protocol to interface with external antivirus and anti-spam systems.
- Adding DKIM signatures to outgoing messages.
- Protection against password brute force with IP bans (SMTP, IMAP, WEB).
- Modular architecture for user and group databases, mail storage, and message queue handler.
- The project is registered in the registry of domestic software of the Ministry of Digital Development of Russia.
Source: opennet.ru
