Average email open rates grew 18.6% year-over-year to 31% in Q1 2013, according to a new report from Epsilon. Mobile email adoption is helping increase engagement metrics. Click rates were up as well, averaging 5.1% during the quarter. The survey also revealed that triggered messages, which include welcome emails, order confirmations and abandoned shopping cart messages, were up 41.1% year-on-year. In fact, triggered messages now make up 3.3% of total email volume.