Filter whether the submitted feedback is considered as spam.
jetpack_contact_form_is_spam
jetpack_contact_form_is_spam-
filter -
filter contact_form_subjectFilters the subject of the email sent after a contact form submission.
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filter grunion_contact_form_success_messageFilter the message returned after a successful contact form submission.
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filter grunion_optimize_tableFilter if the module run OPTIMIZE TABLE on the core WP tables.
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filter jetpack_auto_fill_logged_in_userAllow third-party tools to prefill the contact form with the user’s details when they’re logged in.
Jetpack Developer Resources 