I got a message with two (message x of 20) entries in the subject line. There were two identical messages. The second one had the subject line:
Become an AARP Member and Get All the Great Benefits (freegift: message 2 of 20) (freegift: message 3 of 20)
The first one hat the following subject line:
Become an AARP Member and Get All the Great Benefits (freegift: message 2 of 20)