If a mailer wants to send advance notice to a recipient that a mailpiece has been sent to the recipient, the mailer can choose this option automatically and use {TAIL ~ a unique mailpiece ID} as an identifier of {HEAD ~ the upcoming mailpiece}.  
If a mailer wants to send advance notice to a recipient that a mailpiece has been sent to the recipient , the mailer can choose this option automatically and use { TAIL ~ a unique mailpiece ID } as an identifier of { HEAD ~ the upcoming mailpiece } .
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH