[mortehu]

"Mark as unread" just makes it look like an unread message. I want to read every message as it comes in, in case it's urgent. "Mark as unread" would either obscure new incoming messages from the same sender, or cause me to unnecessarily triage the same message several times.

"Remind me" is time based, which is too arbitrary. I want to instantly see everything unanswered, not have it trickle in at random intervals. Using the "Save" button as "Move to inbox" as nthj suggested makes more sense. It's also easier to click.

[felideon]

Yeah, I either had never really noticed the Save functionality, or never thought to use it as a pseudo-todo list. Will definitely give it a try.