WordPress at a glance
function is not described

PHPMailer\PHPMailer

SMTP::sendAndMail() public WP 1.0

Send an SMTP SAML command. Starts a mail transaction from the email address specified in $from. Returns true if successful or false otherwise. If True the mail transaction is started and then one or more recipient commands may be called followed by a data command. This command will send the message to the users terminal if they are logged in and send them an email. Implements RFC 821: SAML <SP> FROM:<reverse-path> <CRLF>.

{} It's a method of the class: SMTP{}

No Hooks.

Return

true|false.

Usage

$SMTP = new SMTP();
$SMTP->sendAndMail( $from );
$from(string) (required)
The address the message is from

Code of SMTP::sendAndMail() WP 5.7.2

<?php
public function sendAndMail($from)
{
    return $this->sendCommand('SAML', "SAML FROM:$from", 250);
}