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body: the content for the confirmation email.
template: the template for the confirmation email.
subject: the subject for the confirmation email. (Required)
to: the receiver for the admin confirmation mail. (Required)
Note: In the form tag, to: contact_form.email
has to be included as fallback.
Note: Only 1 of the arguments ‘body’ and ‘template’ is allowed at the same time.
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