One of the first mail hosting solution i first encountered the first time i was assigned to find a self hosting mail solution many years ago. As there slogan says "Mail hosting made simple" it is surely very simple to host mail with modoboa it takes between 2-10 minutes to deploy modoboa and start using it to handle mails for you.

Modoboa intergrates very well with known software solutions such as Postfix and Dovecot infact during installation Modoboa will automatically do the installation and configurations of the above mention mail handling backend services. In it's core Modoboa running behind with

Mysql
PostgresSQL
Sqlite3

This are the core points of communication between all modoboa components. One of the known beauty of modoboa is it's easy of extending it, because all it's current features are just extentions built by other folks. If you are a Python and Django User then it's should be far easier to handle the development of modoboa. As modoboa is written by the following webtechnologies.

Python + Django
JQuery
Bootstrap

Modoboa's Boostrap style page.

Modoboa's Main Features

Administration panel
Reputation protection: DNSBL checks, DMARC reports and more
Amavis frontend
Webmail
Calendar
Address book
Per-user Sieve filters
Autoreply messages for Postfix
Graphical statistics about email traffic

Is Modoboa Suitable for Large Organizations?

Perfectly Modoboa is suitable for Small, Medium to Large organization, and the reason is that modoboa builds on top of other large mail servers, Postfix and Dovecot So modoboa will be as large as themself, because it builds just a frontend to work well with them. Modoboa also supports multiple domains, so any organization that has multiple domains can host emails for them of them in the same installlation of modoboa.
Modoboa's Add new domain.