array $mail_data )
Fires after PHPMailer has successfully sent an email.
The firing of this action does not necessarily mean that the recipient(s) received the email successfully. It only means that the
send method above was able to process the request without any errors.
An array containing the email recipient(s), subject, message, headers, and attachments.
tostringEmail addresses to send message.
attachmentsstringPaths to files to attach.
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do_action( 'wp_mail_succeeded', $mail_data );