You have several options for adding email to your phone or tablet.
Connect your email to Google and then just add google to your phone (easiest)
Convert your email over to Zoho and use their app (easy and awesome)
Setup your email on each phone and tablet independently (only if you are good with technology)
If you choose to setup email on your phone and tablets independently, you should know that if you do not have all of the settings correct, you will get locked out of email after your phone checks email 4 times (which will take about 5 min) and then you will have to request that your IP address get unblocked from the server. If this happens more than once, we will no longer provide support to unblock you and you will have to move to Zoho (which takes your email off of our servers).
Here is a screenshot of all of the settings needed to connect your email onto a phone or tablet.