Bare bones description w/o reasons: Provide an additional email command, similar to those for changing email delivery, to give email only members the ability to have a specific, by number, message emailed direct to them.
e.g. xyzgroup+call@groups.io (with a subject of )14587
would cause that numbered message to be transmitted to that member's email address.
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I'm not sure I'm understanding the idea. Is this so a member can have a message re-sent to them by the system rather than having to go to the web page to read it?