Physbot help for subscribe
--------------------------------------------------

Subscribe to Physbot.

The subject of your email message must contain the keyword subscribe.
I.e.

Subject: subscribe

Physbot will respond as to the success/failure of your subscribe
command.

Note that it is not possible to retrieve the list of Physbot
subscribers. The only way to send messages to the list of Physbot
subscribers is via the submit command. This is intentional.

Use the unsubscribe command to unsubscribe from Physbot.

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