Community Knowledge Base

SmarterMail Add-ons

SmarterTools' add-on licensing system allows users to enhance the functionality of SmarterTools products. Information about the add-ons available for your installation, purchasing and/or activating add-ons can be found on the Licensing and Activate page of this online help.

The following add-ons are available for SmarterMail:

  • EAS
  • MAPI / EWS
  • Message Sniffer
  • Cyren Premium Antispam and IP Reputation
  • Cyren Zero-hour Outbreak Detection


EAS is a data synchronization protocol that enables over-the-air access to email, calendars, tasks and notes from most mobile devices. In addition, EAS enables SmarterMail users to have access to their email, calendars, tasks, and notes while working offline. Finally, the default applications installed on Windows 10 and above, which include Windows Mail, People, and Calendar, all support EAS for syncing mail, contacts, and calendars.


MAPI provides users with native Microsoft Outlook synchronization and functionality at the server level. Available for Outlook 2016 and above, MAPI offers standard functionality such as syncing emails, calendars, contacts, tasks and notes, but also additional functionality that is available when connecting Outlook to Microsoft Exchange. This includes advanced features such as delegation, contact groups, etc.

EWS seamlessly syncs SmarterMail messages, contacts, calendars and tasks to third-party email clients, including Apple Mail for MacOS and eM Client for Windows. EWS allows for fast communication between an email client and the mail server and also supports advanced features such as delegation, contact groups, etc.

Message Sniffer

Message Sniffer complements SmarterMail's built-in antispam functionality and accurately captures more spam, viruses, and malware when combined with SmarterMail's "out of the box" protection. It learns about your environment automatically to optimize its performance and accuracy without your intervention; and it can be easily customized to meet your requirements. Because Message Sniffer runs all of its signatures locally, it doesn't need to communicate with any services outside of the mail server, making it quicker and more efficient. Furthermore, the database is regularly and automatically updated to protect against new spam and malware attacks.

Cyren Premium Antispam and IP Reputation

The Cyren Premium Antispam add-on is a service that uses Recurrent Pattern Detection (RPD) technology to protect against spam outbreaks in real time as messages are mass-distributed over the internet. Rather than evaluating the content of messages, the Cyren Detection Center analyzes large volumes of internet traffic in real time, recognizing and protecting against spam outbreaks the moment they emerge.

In addition, the Cyren Premium Antispam add-on includes, at no extra cost, Cyren IP Reputation checks. Cyren IP Reputation builds upon what existing RBLs and URIBLs provide by handling the vast gray area of IPs and IP sources that have little or no information. For example, machines that are hijacked and used by botnets that dynamically use, and abuse, the innocuous IP addresses on those hijacked machines. Cyren analyzes hundreds of millions of messages every day, so they are able to classify (and re-classify), in real-time, the reputation of each IP source.

Cyren Zero-hour Outbreak Detection

The Cyren Zero-hour Outbreak Detection add-on is a service that identifies new, "zero hour" viruses based on their unique distribution patterns and provides a complementary shield to conventional AV technology, protecting in the earliest moments of malware outbreaks and continuing protection as each new variant emerges. It's worth noting that Cyren Zero-hour works best in conjunction with other antivirus products, like the native implementation of ClamAV.