Configuring maximum email message size
Maximum email message size can be configured on your system to provide visibility to contact center agents and supervisors when they attempt to send oversized emails. Size restriction settings are applied globally to all of your mail servers so must be set to meet the requirements of the mail server with the lowest supported message size. When set accurately, and an agent attempts to send an oversized email, an error message displays and they are given the option of editing the email size and resending.
For configuration setting details, see the following Mitel Knowledge Base article: https://mitel.custhelp.com/app/answers/answer_view/a_id/1000649/loc/en_US.
You must use SSL to send emails in order to fully support maximum email message size setting associated behavior.