1. Establish a hard deadline. Specifics are always more convincing. Example: Midnight, Monday, November 25, 2013.
2. Put your deadline in the subject line or make it part of your outer envelope teaser; e.g. “3 days ’til Thanksgiving—SAVE 35% NOW!”
3. Don’t be shy about where you place the deadline or how many times you repeat it. You never know where a scanner’s eye will land first.
Source: Pat Friesen, Today@TargetMarketing, 10/17/13