This filter allows a site owner to customize the response to be emailed, by adding their own HTML around it for example.
jetpack_forms_response_email
jetpack_forms_response_email-
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filter jetpack_forms_response_email_titleFilter the title used in the response email.
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filter grunion_max_new_fieldsFilter to modify the limit of 5 additional contact form fields.
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filter jetpack_forms_dashboard_enableEnable the new Jetpack Forms dashboard.
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filter jetpack_contact_form_htmlFilter the contact form, allowing plugins to modify the HTML.
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filter jetpack_contact_form_email_headersAllow customizing the email headers. Warning: DO NOT add headers or header data from the form submission without proper escaping and validation, or you’re liable to allow abusers to use your site to send spam. Especially DO NOT take email addresses from the form data to add as CC or BCC headers without strictly validating each address against a list of allowed addresses.
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filter jetpack_contact_form_akismet_valuesFilter the values that are sent to Akismet for the spam check.
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filter jetpack_contact_form_in_comment_disallowed_listFilter whether a submitted contact form is in the comment disallowed list.
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filter jetpack_delete_spam_feedbacks_limitFilter the amount of Spam feedback one can delete at once.
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action grunion_after_feedback_post_insertedFires after the feedback post for the contact form submission has been inserted.
Jetpack Developer Resources 