Hello! What should I do for scenario:
SharePoint 2013 and Exchange 2013 are located in my production environment.
ExchORG have maximum message size limit to 50 MB. I want to create warning (look like MailTips) for my internal users - if attachment more 3 MB, then warn user about it: "If you want transfer files try to use sharepoint poral https://portal.company.com/FileSync". I think it can help me reduce mailbox size and push users to use internal portal.
How create warning? I tried MailTips and DLP but cannot create rule or template for my scenario.
Truly, Valery Tyurin