Microsoft SharePoint Foundation checks periodically for incoming e-mail messages from the SMTP service. This setting specifies ...

Microsoft SharePoint Foundation checks periodically for incoming e-mail messages from the SMTP service. This setting specifies the folder in which to look for e-mail messages. When incoming e-mail settings are set to automatic mode, the e-mail drop folder is set automatically to the folder specified by the SMTP service.

Note: When incoming e-mail settings are set to advanced mode you need to ensure that the log on account for the Windows service 'WSS_LONG_NAME Timer' has modify permissions on the e-mail drop folder.