I was setting up Incoming Mails for SharePoint 2013 and like many people on Google, my mails were delivered to the Drop folder and were stuck there. I have solved this and have gained some insights into how Incoming Mails should be configured. This post captures these learnings.


In the end the problem was because of a misconfiguration that was not appropriate for my topology. I will therefore first describe my topology and the original configuration.

I have a 4-servers farm with 2 WFEs and 2 Apps servers. The SharePoint Incoming Mails service is provisioned on both Apps servers. One of the Apps servers runs the Windows SMTP Service.