The actual E-Mail addresses of the recipients have been x'd out in the examples below. This is only a small example of the logs. Note the refused by and operation timed out. The server tries for 5 days, then it deletes the mail as un-deliverable. You never get un-subscribed. The appear as ligit lists but they make it impossible to un-subscribe.
g1J5lYX02526     8413 Tue Feb 19 00:47 MAILER-DAEMON
      8BITMIME   (Deferred: Connection refused by listserv6.networkpromotion.c)
                                       <owner-nolist-1111_1*xxxxxxx**COMTECK*
g1J5WkX99960     8425 Tue Feb 19 00:32 MAILER-DAEMON
      8BITMIME   (Deferred: Connection refused by listserv6.networkpromotion.c)
                                       <owner-nolist-1111_1*xxxxxxx**COMTECK*
g1J0r0X27228     9129 Mon Feb 18 19:53 MAILER-DAEMON
                 (Deferred: Operation timed out with a.mx.kooldeals.net.)
                                       <offers@kooldeals.net>
g1IMCeX80084    14209 Mon Feb 18 17:12 MAILER-DAEMON
      8BITMIME   (Deferred: Connection reset by listserv6.networkpromotion.com)
                                       <owner-nolist-1111_1*XXXXX**COMTECK*-COM
g1I3Z6X36589    10652 Sun Feb 17 22:35 MAILER-DAEMON
      8BITMIME   (Deferred: Operation timed out with a.mx.wowdeals.net.)
                                       <offers@wowdeals.net>
      8BITMIME   (Deferred: Operation timed out with mail.offermail.net.)
                                       <bi-bouce@offermail.net>
      8BITMIME   (Deferred: Operation timed out with opt21.edirectnetwork.net.)
                                       <opt-in@opt21.edirectnetwork.net>
      8BITMIME   (Deferred: Operation timed out with opt25.edirectnetwork.net.)
                                       <opt-in@opt25.edirectnetwork.net>
      8BITMIME   (... reply: read error from )
                                       <opt-in@opt36.edirectnetwork.net>
      8BITMIME   (Deferred: Operation timed out with opt24.edirectnetwork.net.)
                                       <opt-in@opt24.edirectnetwork.net>
     8BITMIME   (Deferred: Operation timed out with inbound1.em5000.com.)
                 (Deferred: Operation timed out with inbound2.em5000.com.)
                 (Deferred: Operation timed out with inbound1.em5000.com.)
                 (Deferred: Connection refused by exploder6-old.em5000.com.)
                 (Deferred: Operation timed out with inbound2.em5000.com.)
                 (Deferred: Connection refused by exploder6-old.em5000.com.)
                 (Deferred: Operation timed out with inbound1.em5000.com.)
                 (Deferred: Connection refused by exploder6-old.em5000.com.)
                 (Deferred: Operation timed out with inbound1.em5000.com.)