To find an answer to this common question Ryan Soslutions looked at 18 post-departure campaigns that ran for the last six months, sending messages to 60,000 guests. After starting low for emails in their sample that were sent the day after departure (37.7%), open rates jumped quickly at 2 days (50.8%) before slowly dropping all the way to 7 days (40.1%). There were no emails sent 6 days after departure in this sample. Get the full story at Ryan Solutions