Filters the message sent via email after a successful form submission.
contact_form_message
contact_form_message-
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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
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filter pre_comment_author_emailThis filter is already documented in core/wp-includes/comment-functions.php
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filter pre_comment_author_nameThis filter is already documented in core/wp-includes/comment-functions.php
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filter grunion_contact_form_form_actionFilter the contact form action URL.
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filter grunion_contact_form_success_messageFilter the message returned after a successful contact form submission.
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filter contact_form_is_spam_akismetFilter the results returned by Akismet for each submitted contact form.
Jetpack Developer Resources 