Your address "$user_email" has been invited to join the $short_listname
mailing list at $domain by the $short_listname mailing list owner.
You may accept the invitation by simply replying to this message.

Or you should include the following line -- and only the following
line -- in a message to $request_email:

    confirm $token

Note that simply sending a `reply' to this message should work from
most mail readers.

If you want to decline this invitation, please simply disregard this
message.  If you have any questions, please send them to
$owner_email.