iPads have an e-mail application that is essentially the same as any computer e-mail software. In fact on the Rock Legends cruise while I was sitting in the Cafe Promenade each morning with my iPad, I'd download my e-mails and disconnect, and then read them.
Paul, we did 8 cruises for the year. We live in Texas. Wife retired and we rewarded oursleves with the cruises. Got emails through my yahoo account. Composed and/or read offline, went online to send or receive. Will do less this year as she is getting a hip replacement. Back again by mid year.