Send an Email to the Form Submitter
The Mailer Adapter normally will send email only to a predefined set of email addresses. However, if you want the person submitting the form to receive an email, you must dynamically override the default behavior of the Mailer Adapter.
Provided that you have a field for capturing an email address in your form, you can use the address that someone enters to mail that person a customizable message. By default, when you create a new Form Folder, PloneFormGen generates an email field for you with the short name replyto. If you have deleted this field, or want to rename the field, be sure to take note of what the short name is for your email address field. You will need this information to complete the override.
Setting the Override
Go to your Form Folder, and Edit the Mailer Adapter. Then click on
the Overrides tab. You should see a screen that looks like this: 
Notice the Recipient Expression field. Paste the following string into that field:
request/form/replyto
Where "replyto" is the short name of your email address field. You have just entered a TALES expresssion that will automatically retrieve the address someone enters in your email address field after submitting the form and use that address to direct the Mailer template to.
Note that you can use multiple Mailer Adapters in a single form.
This way you can have one adapter for sending the form submitter a
message AND have another for sending a message to yourself.
Customize the Email Message and Template
Now that you have configured the recipient expression override you may wish to customize the body and/or template of the email that will be sent to the form submitter. This can be done via the Message and Template tabs of the Mailer Adapter.
The Message tab allows you to enter plain-text content before and after the email template. By default, the email template simply sends a listing of form data in a Fieldname-Value format. The HTML used to render this listing is called a Definition List, which uses the HTML tags <dl>, <dt>, and <dd>.
Additionally, the template uses Plone templating language TALES. If you are not familiar with HTML or TALES you should leave the template alone and just make use of the Message tab for including your content. For some pointers on how to customize the mailer template, read the last section of this tutorial.
