不使用PHPMailer, Swiftmailer, PEAR, Zend_mail，或任何其他库，我想发送电子邮件与图像附件内联。
这里重要的部分是内联的:我已经能够做其他的事情了。
内联意味着它可以被HTML在电子邮件中的图像标签所使用。
我真的不想使用PHPMailer或类似的东西——我不是唯一一个试图弄清楚如何在stackoverflow上做到这一点的人，到目前为止，我所看到的所有问题都只是关于为什么他们应该使用PEAR或Zend_mail或其他东西的争论。我不想那样做，我也不想为此争论。
这是你要找的吗??
<?php
//define the receiver of the email
$to = 'youraddress@example.com';
//define the subject of the email
$subject = 'Test email with attachment';
//create a boundary string. It must be unique
//so we use the MD5 algorithm to generate a random hash
$random_hash = md5(date('r', time()));
//define the headers we want passed. Note that they are separated with 'r'n
$headers = "From: webmaster@example.com'r'nReply-To: webmaster@example.com";
//add boundary string and mime type specification
$headers .= "'r'nContent-Type: multipart/mixed; boundary='"PHP-mixed-".$random_hash."'"";
//read the atachment file contents into a string,
//encode it with MIME base64,
//and split it into smaller chunks
$attachment = chunk_split(base64_encode(file_get_contents('attachment.zip')));
//define the body of the message.
ob_start(); //Turn on output buffering
?>
--PHP-mixed-<?php echo $random_hash; ?>
Content-Type: multipart/alternative; boundary="PHP-alt-<?php echo $random_hash; ?>"
--PHP-alt-<?php echo $random_hash; ?>
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
Hello World!!!
This is simple text email message.
--PHP-alt-<?php echo $random_hash; ?>
Content-Type: text/html; charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
<h2>Hello World!</h2>
<p>This is something with <b>HTML</b> formatting.</p>
--PHP-alt-<?php echo $random_hash; ?>--
--PHP-mixed-<?php echo $random_hash; ?>
Content-Type: application/zip; name="attachment.zip"
Content-Transfer-Encoding: base64
Content-Disposition: attachment
<?php echo $attachment; ?>
--PHP-mixed-<?php echo $random_hash; ?>--
<?php
//copy current buffer contents into $message variable and delete current output buffer
$message = ob_get_clean();
//send the email
$mail_sent = @mail( $to, $subject, $message, $headers );
//if the message is sent successfully print "Mail sent". Otherwise print "Mail failed"
echo $mail_sent ? "Mail sent" : "Mail failed";
?>
我不知道这是不是你想要的，但是很容易在PHP中用mail()函数发送电子邮件，在HTML格式:
http://php.net/manual/en/function.mail.php在示例中，有一个HTML