Building a List Subscription Segment
List Subscription expressions can be used to identify Members who are currently subscribed (or not subscribed) to a List, or who subscribed to (or unsubscribed from) a List during a specified period of time. That period of time can be entered as an absolute date range (e.g., "between 1/1/2015 and 1/31/2015"), as a relative date range (e.g., "in the past 3 months"), or as a combination of the two (e.g., "since 6/1/2015").
For example, if you'd like to send a mailing to Members who subscribed to the Main Street Club eclub list in the past month but who are not subscribed to the "Live Music", suggesting that perhaps they should subscribe to "Live Music" as well, you could create a segment that reads "Subscribed to 'Main Street Grill eclub' in the past 1 months and 0 days AND is not currently subscribed to 'Live Music". This segment would consist of two List Subscription Expressions joined by an "AND" conjunction, as shown in the following screenshot: