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Drupal 7 Webform Cookbook by Douglas Vernon Denny

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Adding e-mail components

To assist with communication between form users and our conference organizers we will capture the e-mail address of registering speakers. The field will be a mandatory input and we will add a validation rule to ensure that no two speakers submit the same e-mail address.

It is quite possible that registering speakers are already registered users of our website, so we're going to default the Drupal user's e-mail address into this field. Many people have several e-mail addresses that they use for different purposes and it is possible that the registered user's e-mail address is not necessarily the preferred address that the registering speaker would like correspondence being addressed to. For this reason we will leave this ...

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