Double opt-in requires traditional bounce handling to be enabled
Overview
The default double opt-in email says:
You have a pending subscription to the {subscribe.group} mailing list. To confirm this subscription, reply to this email or click here.
However, "reply to this email" requires traditional bounce handling (with a bounce mailbox) to be set up. In this day and age that's less common compared to using a third party mailer that sends bounce notifications via API (to Airmail or one of its many cousins).
Moreover, it's a usability issue to put "here" as the clickable text. It should be more like: "Please click here to confirm your subscription..
I want to get concept approval - and also guidance on whether we should update existing templates or just new installs. Personally I think we should update any non-customized template.