Filter the HTML of the Contact Form.
grunion_contact_form_field_html
grunion_contact_form_field_html-
filter -
filter grunion_contact_form_redirect_urlFilter the URL where the reader is redirected after submitting a form.
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filter grunion_should_send_emailFilter to choose whether an email should be sent after each successful contact form submission. This filter takes precedence over the emailNotifications attribute.
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filter grunion_still_email_spamChoose whether an email should be sent for each spam contact form submission.
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action grunion_pre_message_sentFires right before the contact form message is sent via email to the recipient specified in the contact form.
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filter contact_form_messageFilters the message sent via email after a successful form submission.
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filter contact_form_subjectFilters the subject of the email sent after a contact form submission.
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filter contact_form_toFilter the email where a submitted feedback is sent.
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filter jetpack_contact_form_is_spamFilter whether the submitted feedback is considered as spam.
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filter pre_comment_author_urlThis filter is already documented in core/wp-includes/comment-functions.php
Jetpack Developer Resources 