Fair point. The web UI and (iirc) imap/pop daemons are Java based. The smtpd is postfix. It also uses MySQL for some of its storage, and OpenLDAP for authentica

Fair point. The web UI and (iirc) imap/pop daemons are Java based. The smtpd is postfix. It also uses MySQL for some of its storage, and OpenLDAP for authentication. On the other hand, it scales well.