Remindness is a complete and free server-side email filtering solution. It can be installed on practically any virtualization system and act as an SMTP gateway.
Remindness needs to be installed between the internet and your final email server, either by obtaining the new MX record to your domains or by getting an email from the frontend gateways. Once filtered, the messages will be forwarded to a destination email server or subsequent gateway.
You don’t need to configure all mailboxes, Remindness will filter automatically all valid messages to you, the moment you establish a domain.
The value of Remindness is that using those tools is almost transparent for the users and administrators as configuration and settings are done via a unified and intuitive web-interface.
Users can check with their quarantine in real-time, and put their own tastes, address by address. The interface ensures harmonious and customizable access to all details of the machine, both preventing intrusion on user’s habits and allowing the administrators to focus on other interesting tasks.
Remindness is totally compatible with Active Directory, LDAP, Zimbra, Domino, and Exchange. You might even use it with Microsoft Office 365 or Gmail — G Suite.