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filter

wp_sharing_email_send_post_subject

Filter the Sharing Email Send Post Subject.

Parameters

$var
string

Sharing Email Send Post Subject. Default is "Shared Post".

Changelog

How to use this hook

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

Notes

You can use this filter to customize the subject line of the emails that are sent via the Email sharing button. Here is an example: 
function jeherve_email_sharing_customize_subject() {
	return 'Check this great post I just found!';
}
add_filter( 'wp_sharing_email_send_post_subject', 'jeherve_email_sharing_customize_subject' );