The Suspicious Email Submitter is a discontinued add-in for Outlook 2016. It is part of a suite of extensions for common web browsers and email clients that enables the user to easily submit a suspicious email with all the information necessary to a pre-configured destination for further analysis, such as a MISP instance or email address.
A list of alternative add-ins that may be of interest is in this ticket.
This project is hosted by the Computer Incident Response Center for Civil Society (CiviCERT), representing the needs of the at-risk communities Rapid Response Network member organizations serve. The extension will be built to be easily configurable for use by other organizations and communities both within and beyond these communities.