During this call, Paul and Scott may reference non-GAAP financial measures. A reconciliation of differences between GAAP and non-GAAP financial measures is provided in the appendix of the earnings release, which is posted on the Investor Relations website. Also, during this call, various remarks we make about future expectations, plans and prospects for the company constitute forward-looking statements for the purposes of the Safe Harbor provisions under the Private Securities Litigation Reform Act of 1995. Actual results may differ materially from expectations, plans and prospects contemplated in these forward-looking statements as a result of various factors, including those discussed in our latest 10-K and subsequent 10-Q filings with the SEC.
And now I'll turn the call over to Paul.
Paul D. Davis
Thanks, Rosemary, and I'd like to thank each of you for joining us today. We're pleased with our performance in Q2. We had revenue growth of 22%, 26% growth from Redbox. With Redbox, we had nearly 180 million rentals and we now have 38,500 Redbox kiosks in over 31,100 locations. We're particularly excited about the growth that we experienced at the market share. We -- for the quarter, we are on a unit basis at 42.5%, which is up a full 8 percentage points year-over-year. We lead our online by mail [ph] competitor now by over 15 percentage points.We had 38 million unique credit cards used in the quarter, which was up 13% from Q2 of last year, and we track email addresses into the quarter at 43.5 million unique email addresses, which was up 3.5 million in the quarter and up 42% from a year ago. We're in a great position to increase our Redbox footprint and gain additional share with the closing of the NCR transaction. We're particularly excited about the new retailers that we are now working with, including Publix and Safeway, allowing us to fill out markets that where we didn't have presence before and allow us to bring Redbox value and convenience to additional consumers.