If a recipient of the email selects one of the product images presented in the email, an identifier of the selected image and {HEAD ~ information} about {TAIL ~ the email recipient} are forwarded to the product vendor 
If a recipient of the email selects one of the product images presented in the email , an identifier of the selected image and { HEAD ~ information } about { TAIL ~ the email recipient } are forwarded to the product vendor
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH