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filter

grunion_should_send_email

Filter to choose whether an email should be sent after each successful contact form submission. This filter takes precedence over the emailNotifications attribute.

Parameters

$should_send
(bool | null)

Should an email be sent after a form submission. – true: Send email regardless of emailNotifications setting – false: Don't send email regardless of emailNotifications setting – null: Use emailNotifications attribute to determine (default behavior)

$post_id
int

Post ID.

Changelog

How to use this hook

See “How to use actions and filters to customize Jetpack”.

Notes

You can use this filter to disable all emails that may be sent when a form is submitted on your site, like so: 
add_filter( 'grunion_should_send_email', '__return_false' );