Major open source softwares used in iRedMail

Name	Comment	Command used to check software version
Postfix	Mail Transfer Agent (MTA)	postconf mail_version
Dovecot	POP3, IMAP and Managesieve server	dovecot --version
Apache, Nginx	Web server	apachectl -v nginx -v
OpenLDAP, ldapd(8)	LDAP server, used for storing mail accounts (optional).	slapd -V
MySQL, MariaDB, PostgreSQL	SQL server used to store application data. Could be used to store mail accounts too.	mysql --version psql -V
Amavisd-new	Interface between Postfix and SpamAssassin, ClamAV. it calls SpamAssassin and ClamAV for content-based spam/virus scanning.	amavisd-new -V
SpamAssassin	content-based spam scanner	spamassassin -V
ClamAV	Virus scanner	clamd -V
Cluebringer	A third-party postfix policy server
Roundcube	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 -- too many password failures, seeking for exploits, etc.	fail2ban-server -V
Awstats	Apache and Postfix log analyzer
iRedAPD	A very simple postfix policy server developed by iRedMail team	grep '__version__' /opt/iredapd/libs/__init__.py

The Big Picture