Marking a recurring item done via email link marks the whole series done.

Marking a recurring item done via email marks the whole series as done silently. While it is nice to get a email reminder on a recurring item, having to go to the website to mark just the one recurrence done is an annoyance. It would be much better if the email for recurring items had two links:
"Mark this one done"
"Mark all of these done"

Somewhat better would be changing the "mark done" link in the email to only mark the current recurrence done and not the whole series.