Tnreceive and Polling serrvice for a folder

Good Morning all. I am passing XML file as a mail attachment with subject line wm:tn.receive manually .Where will this XML file go after I pass to it? I want to store it in a particular folder on the machine where IS 4.6 is installed and it should be polled and picked up by IS.How do I drop it in a particular folder?Also Is there any built in service in IS 4.6 which can poll a folder every x minute and pick up files of *.xml extension?The data from picked up file will have to be extracted and inserted into target database.Further I want to use TN at Hub end.

thanks for any help

You can use WM Scheduler services for polling mechanism and trigger custom java or flow service to pickup the file.