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# Major open source softwares used in iRedMail
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[TOC]
## Used Components
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Name | Comment
--- |---
[Postfix ](http://www.postfix.org ) | Mail Transfer Agent (MTA)
[Dovecot ](http://www.dovecot.org ) | POP3, IMAP and Managesieve server
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[Nginx ](http://www.nginx.org ), [Nginx ](http://nginx.org ) | Web server
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[OpenLDAP ](http://www.openldap.org ), [ldapd(8) ](http://www.openbsd.org/cgi-bin/man.cgi/OpenBSD-current/man8/ldapd.8?query=ldapd&arch=i386 ) | LDAP server, used for storing mail accounts (optional)
[MySQL ](http://www.mysql.com ), [MariaDB ](https://mariadb.org ), [PostgreSQL ](http://www.postgresql.org ) | SQL server used to store application data. Could be used to store mail accounts too.
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[mlmmj ](http://mlmmj.org ) | Mailing list manager. Shipped in iRedMail-0.9.8 and later releases.
[Amavisd-new ](http://www.amavis.org ) | Interface between Postfix and SpamAssassin, ClamAV.
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[SpamAssassin ](http://spamassassin.apache.org ) | Content-based spam scanner
[ClamAV ](http://www.clamav.net/ ) | Virus scanner
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[Roundcube webmail ](http://roundcube.net ) | Webmail (PHP)
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[SOGo Groupware ](http://sogo.nu ) | A groupware which provides calendar (CalDAV), contact (CardDAV), tasks and ActiveSync services
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[Fail2ban ](http://www.fail2ban.org ) | Scans log files and bans IPs that show the malicious signs
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[iRedAPD ](https://github.com/iredmail/iRedAPD/ ) | A simple postfix policy server developed by iRedMail team, with SRS (Sender Rewrite Scheme) support.
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## The Big Picture
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![](./images/big.picture.png)
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## Mail Flow of Inbound Emails
![](./images/flow.inbound.png)
## Mail Flow of Outbound Emails
![](./images/flow.outbound.png)
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## See also
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* [Locations of configuration and log files of major components ](./file.locations.html )
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* [Which network ports are open by iRedMail ](./network.ports.html )