Hi,
So I am setting up a dev environment with SMTP and incoming email for SP2013.
After some extra hours of work I finally was able to send mail to the address and the email (eml file) lands in the famous drop folder and seems to be taken care of since it nicely disappears after the email timer job is ran.
HOWEVER, the document library is still empty! Why??
I have granted all the access needed to the wss_admin_wpg and wss_wpg users  for the drop folder.
SharePoint OOB functionality for you. Right.Â
ULS log? It only says 1 item was processed. That’s all.
Magnus
If I now just copy an eml file to the drop folder I am getting the:
07/23/2014 14:05:37.22 OWSTIMER.EXE (0x0B74) 0x0B94 SharePoint Foundation E-Mail 6872 Critical A critical error occurred while processing the incoming e-mail file c:\inetpub\mailroot\drop\emailTest.eml. The error was: Bad senders or recipients.. 9a54a79c-6234-e0d8-0000-098a51090f58
Sending an email from a standard email account, the mail file is just processed as before, and no element in the SP library.