Webform Email Triggers allows you to modify webform email text depending on the options selected by the user during submission.
For example, if you ask the following question in your webform:
How will you be travelling to the event?
A different set of directions could be added to the email for someone who chose 'By air', 'By car' or 'On foot'.
The module uses tokens so the layout of your email is still fully customisable.