The 'Modify Details' form needs to be authenticated to make sure the owner of the email address is the only one who can modify his or her details so they will only be able to visit the Modify Details form by following a link that was included in an email sent directly to them.
The 'Send to a friend' form needs to be included in the email campaign as the form needs to know what email to forward and who it is being forwarded from.

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