<?php

$from = 'admin@example.com'; // от кого
$to = 'to@example.com'; // кому
$subj = 'тема'; // тема письма
$text = 'текст'; // текст письма
$filename = 'test.txt'; // файл для отправки

function FileToMail($from, $to, $subj, $text, $filename) {
$f         = fopen($filename,"rb");
$un        = strtoupper(uniqid(time()));
$head      = "From: $from\n";
$head     .= "To: $to\n";
$head     .= "Subject: $subj\n";
$head     .= "X-Mailer: PHPMail Tool\n";
$head     .= "Reply-To: $from\n";
$head     .= "Mime-Version: 1.0\n";
$head     .= "Content-Type:multipart/mixed;";
$head     .= "boundary=\"----------".$un."\"\n\n";
$msg       = "------------".$un."\nContent-Type:text/html;\n";
$msg      .= "Content-Transfer-Encoding: 8bit\n\n$text\n\n";
$msg      .= "------------".$un."\n";
$msg      .= "Content-Type: application/octet-stream;";
$msg      .= "name=\"".basename($filename)."\"\n";
$msg      .= "Content-Transfer-Encoding:base64\n";
$msg      .= "Content-Disposition:attachment;";
$msg      .= "filename=\"".basename($filename)."\"\n\n";
if (filesize($filename) > 0) $msg      .= chunk_split(base64_encode(fread($f,filesize($filename))))."\n";
else return 0;

if (!@mail("$to", "$subj", $msg, $head)) return 0;
else return 1;
}

if (FileToMail($from, $to, $subj, $text, $filename)) echo 'Выполнено успешно';
else echo 'Произошла ошибка';
?>