The incoming e-mail drop folder is not configured.

Hi,

"Event ID 6872: The incoming e-mail drop folder is not configured. If automatic settings are being used, confirm that the SMTP service is running."

We get drop folder errors on front end servers in SharePoint 2013. All servers are up to date with Windows and SharePoint latest patches. SMTP service is set to Automatic and running. Farm account has full access to C:\inetpub\mailroot.

Is any way to fix this?

Thanks