Send email with URL of same page as the email link?
insert a Drupal token of the current page url into the WYSIWYG. This token is provided by drupal 7 core I believe.

See the Token Insert module.


  This module allows you to insert tokens into a textarea. It supports
  both plain text and wysiwyg textareas. The format used for the insert
  is compatible with Token Filter.
  
  This module contains three modules:
  
  
  Token Insert UI: Allows you to select which tokens are available for
  the insert, by default all tokens are shown. This module doesn't have
  to be enabled to use the others.
  Token Insert (text): Add a fieldset
  under each textarea, works for both plain text fields and wysiwyg
  fields.
  Token Insert (wysiwyg): Adds an extra button to wysiwyg
  editors and opens a popup to select the token to insert.