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Subscription Hyperlink Insertion 
This function allows you to include a hyperlink from the text of your mail form. You use this function when you want recipients of your newsletter to subscribe to or unsubscribe from your newsletter.
· You have created the text node in which the hyperlink is to be included.
· You have maintained the hyperlink to your newsletter subscription page in Customizing. For more information, see Newsletter Management.
Choose Insert ® Subscribe/Unsubscribe to insert the subscription link in the text of the mail form.