include($INCLUDE_FOLDER.'lib/Mail.php');       

include($INCLUDE_FOLDER.'lib/Mail/mime.php');  



// создание письма:

$headers["To"]           = ...

$headers["From"]         = ...

$headers["Subject"]      = ...

$headers["content-type"] = 'multipart/mixed; charset=koi8-r';



$crlf = "n";

$mime = new Mail_mime($crlf);

$mime->settxtbody("текст для отправки");



$body = $mime->get(array('text_encoding' => '8bit',

                         'html_encoding' => '8bit',

                         'head_charset' => 'koi8-r',

                         'text_charset' => 'koi8-r',

                         'html_charset' => 'koi8-r' ));



$headers = $mime->headers($headers);





// работа с SMTP

$params["host"]     = ...

$params["auth"]     = // одно из: 'DIGEST-MD5', 'CRAM-MD5', 'LOGIN', 'PLAIN'

$params["username"] = ...

$params["password"] = ...



$smtp = mail::factory('smtp',$params);

if (pear::iserror($smtp)) die($smtp->getmessage());

$smtp->send($to, $headers, $body);