"Member must earn at least 1,000 Tier Credits by March 31, 2015 to be eligible for the promotion. 50% Tier Credit Bonus will be awarded on up to the first 50,000 Tier Credits earned from January 1, 2015 through March 31, 2015, for a maximum total bonus of 25,000 Tier Credits. Daily Tier Credit Bonuses will count toward the 50,000 Tier Credits maximum. Loyalty bonuses are not earned Tier Credits and thus, are not eligible for this promotion. Tier Credit Bonuses, including this promotion, do not count toward Reward Credit balance, promotional Tier Credit earnings, or qualifying for another daily bonus. Total Tier Credit Bonus amount awarded through this promotion will be calculated after March 31st, 2015 and will be posted to the Total Rewards account on April 15, 2015. "

The email says nothing about being exclusive to the recipient.