testing PEAR::Mail with and without recipient

output of 'php testmail.php "joe@example.com"

Recipient = joe@example.com
DEBUG: Recv: 220 omta07.emeryville.ca.mail.comcast.net comcast ESMTP server ready
DEBUG: Send: EHLO localhost

DEBUG: Recv: 250-omta07.emeryville.ca.mail.comcast.net hello [71.63.215.130], pleased to meet you
DEBUG: Recv: 250-HELP
DEBUG: Recv: 250-AUTH LOGIN PLAIN
DEBUG: Recv: 250-SIZE 36700160
DEBUG: Recv: 250-ENHANCEDSTATUSCODES
DEBUG: Recv: 250-8BITMIME
DEBUG: Recv: 250-STARTTLS
DEBUG: Recv: 250 OK
DEBUG: Send: STARTTLS

DEBUG: Recv: 220 2.0.0 Ready to start TLS
DEBUG: Send: EHLO localhost

DEBUG: Recv: 250-omta07.emeryville.ca.mail.comcast.net hello [71.63.215.130], pleased to meet you
DEBUG: Recv: 250-HELP
DEBUG: Recv: 250-AUTH LOGIN PLAIN
DEBUG: Recv: 250-SIZE 36700160
DEBUG: Recv: 250-ENHANCEDSTATUSCODES
DEBUG: Recv: 250-8BITMIME
DEBUG: Recv: 250 OK
DEBUG: Send: AUTH LOGIN

DEBUG: Recv: 334 VXNlcm5hbWU6
DEBUG: Send: dGFtb3VzZQ==

DEBUG: Recv: 334 UGFzc3dvcmQ6
DEBUG: Send: TjF0d29vZEA5

DEBUG: Recv: 235 2.7.0 ... Authentication succeeded
DEBUG: Send: MAIL FROM:<tamara@tamaratemple.com>

DEBUG: Recv: 250 2.1.0 <tamara@tamaratemple.com> sender ok
DEBUG: Send: RCPT TO:<joe@example.com>

DEBUG: Recv: 250 2.1.5 <joe@example.com> recipient ok
DEBUG: Send: DATA

DEBUG: Recv: 354 enter mail, end with "." on a line by itself
DEBUG: Send: From: tamara@tamaratemple.com
To: joe@example.com
Subject: Test message

Test message
DEBUG: Send: 
.

DEBUG: Recv: 250 2.0.0 Q8Dx1k00A2pNiMz8U8DyzJ mail accepted for delivery
DEBUG: Send: QUIT

DEBUG: Recv: 221 2.0.0 omta07.emeryville.ca.mail.comcast.net comcast closing connection

output of testmail.php ""

Recipient = 
DEBUG: Recv: 220 omta16.emeryville.ca.mail.comcast.net comcast ESMTP server ready
DEBUG: Send: EHLO localhost

DEBUG: Recv: 250-omta16.emeryville.ca.mail.comcast.net hello [71.63.215.130], pleased to meet you
DEBUG: Recv: 250-HELP
DEBUG: Recv: 250-AUTH LOGIN PLAIN
DEBUG: Recv: 250-SIZE 36700160
DEBUG: Recv: 250-ENHANCEDSTATUSCODES
DEBUG: Recv: 250-8BITMIME
DEBUG: Recv: 250-STARTTLS
DEBUG: Recv: 250 OK
DEBUG: Send: STARTTLS

DEBUG: Recv: 220 2.0.0 Ready to start TLS
DEBUG: Send: EHLO localhost

DEBUG: Recv: 250-omta16.emeryville.ca.mail.comcast.net hello [71.63.215.130], pleased to meet you
DEBUG: Recv: 250-HELP
DEBUG: Recv: 250-AUTH LOGIN PLAIN
DEBUG: Recv: 250-SIZE 36700160
DEBUG: Recv: 250-ENHANCEDSTATUSCODES
DEBUG: Recv: 250-8BITMIME
DEBUG: Recv: 250 OK
DEBUG: Send: AUTH LOGIN

DEBUG: Recv: 334 VXNlcm5hbWU6
DEBUG: Send: dGFtb3VzZQ==

DEBUG: Recv: 334 UGFzc3dvcmQ6
DEBUG: Send: TjF0d29vZEA5

DEBUG: Recv: 235 2.7.0 ... Authentication succeeded
DEBUG: Send: MAIL FROM:<tamara@tamaratemple.com>

DEBUG: Recv: 250 2.1.0 <tamara@tamaratemple.com> sender ok
DEBUG: Send: RCPT TO:<@localhost>

DEBUG: Recv: 550 5.5.0 <@localhost> invalid address
DEBUG: Send: RSET

DEBUG: Recv: 250 2.0.0 OK
PEAR SMTP Send error: Failed to add recipient: @localhost [SMTP: Invalid response code received from server (code: 550, response: 5.5.0 <@localhost> invalid address)]
Mail object: [pear_error: message="Failed to add recipient: @localhost [SMTP: Invalid response code received from server (code: 550, response: 5.5.0 <@localhost> invalid address)]" code=10005 mode=return level=notice prefix="" info=""]
Mail debug info: 

	testmail.php failed

DEBUG: Send: QUIT

DEBUG: Recv: 221 2.0.0 omta16.emeryville.ca.mail.comcast.net comcast closing connection

testmail.php

<?php  // -*- mode: php; time-stamp-start: "version [\"<]"; time-stamp-format: "%Y-%3b-%02d %02H:%02M"; -*- 
/**
 *
 * testmail
 *
 * @author Tamara Temple <tamara@tamaratemple.com>
 * @since 2012-11-14
 * @version <2012-Nov-16 02:07>
 * @copyright (c) 2012 Tamara Temple Web Development
 * @license GPLv3
 *
 */

require_once 'Mail.php';

header('Content-type: text/plain;');

$recipient = $argv[1]; // first argument is email address of recipient
printf("Recipient = %s\n", $recipient);


$headers['From']    = 'tamara@tamaratemple.com';
$headers['To']      = $recipient;
$headers['Subject'] = 'Test message';

$body = 'Test message';

$creds = yaml_parse_file(".smtpcreds.yaml");

$smtp = Mail::factory('smtp',
                      array ('host' => $creds['host'],
                             'auth' => true,
                             'port' => $creds['port'],
                             'debug' => true,
                             'username' => $creds['username'],
                             'password' => $creds['password'])); 

if (PEAR::isError($smtp)) {
    printf("PEAR Mail Factory error: %s\n", $smtp->getMessage());
    printf("SMTP Object: %s\n", $smtp->toString());
    printf("SMTP Debug info: %s\n", $smtp->getDebugInfo());
    die("\n\ttestmail.php failed\n\n");
}

$mail = $smtp->send($recipient, $headers, $body);

if (PEAR::isError($mail)) {
    printf("PEAR SMTP Send error: %s\n", $mail->getMessage());
    printf("Mail object: %s\n", $mail->toString());
    printf("Mail debug info: %s\n", $mail->getDebugInfo());
    die("\n\ttestmail.php failed\n\n");

}