Fires after PHPMailer has successfully sent an email.
Description
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.
Parameters
$mail_dataarray
{ An array containing the email recipient(s), subject, message, headers, attachments, and embeds. @type string[] $to Email addresses to send message. @type string $subject Email subject. @type string $message Message contents. @type string[] $headers Additional headers. @type string[] $attachments Paths to files to attach. @type string[] $embeds Paths to files to embed.}