# Major open source softwares used in iRedMail

## Used Components

Name | Comment
--- | ---
Postfix | Mail Transfer Agent (MTA)
Dovecot | POP3, IMAP and Managesieve server
Nginx, Nginx | Web server
OpenLDAP, ldapd(8) | LDAP server, used for storing mail accounts (optional)
MySQL, MariaDB, PostgreSQL | SQL server used to store application data. Could be used to store mail accounts too.
mlmmj | Mailing list manager. Shipped in iRedMail-0.9.8 and later releases.
Amavisd-new | Interface between Postfix and SpamAssassin, ClamAV.
SpamAssassin | Content-based spam scanner
ClamAV | Virus scanner
Roundcube webmail | Webmail (PHP)
SOGo Groupware | A groupware which provides calendar (CalDAV), contact (CardDAV), tasks and ActiveSync services
Fail2ban | Scans log files and bans IPs that show the malicious signs
iRedAPD | A simple postfix policy server developed by iRedMail team, with SRS (Sender Rewrite Scheme) support.

## The Big Picture

## Mail Flow of Inbound Emails

## Mail Flow of Outbound Emails

## See also

- Locations of configuration and log files of major components
- Which network ports are open by iRedMail