You can use the built-in mail () function to send letters, but it is usually very limited. For example, I do not think that you can use other SMTP servers than the one specified in your php.ini file.
Instead, you should take a look at the Mail PEAR package . For instance:
<?php require_once "Mail.php"; $from = "Sandra Sender < sender@example.com >"; $to = "Ramona Recipient < recipient@example.com >"; $subject = "Hi!"; $body = "Hi,\n\nHow are you?"; $host = "mail.example.com"; $username = "smtp_username"; $password = "smtp_password"; $headers = array ('From' => $from, 'To' => $to, 'Subject' => $subject); $smtp = Mail::factory('smtp', array ('host' => $host, 'auth' => true, 'username' => $username, 'password' => $password)); $mail = $smtp->send($to, $headers, $body); if (PEAR::isError($mail)) { echo("<p>" . $mail->getMessage() . "</p>"); } else { echo("<p>Message successfully sent!</p>"); } ?>
(I stole this example from http://email.about.com/od/emailprogrammingtips/qt/PHP_Email_SMTP_Authentication.htm : P)
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