To save an email message for later swipe the message to the right and release on the ribbon icon.
Then set when you would like Cloze to remind you.
In a message you can tap on the bookmark icon to save any item for later. You'll find these items on your Agenda based on the reminder time you set. We'll remind you based on your settings.
Note: if you tap on "Someday" list you'll see these in the "Someday" section on the Agenda.