I\'m using PHP to send out a multipart/mixed message (plain text, html and attachments). However, whilst it works for most accounts, Yahoo, GMail and Sky seem to show blank
Please verify whether your code is look like the following because the following code is working fine for me.
$headers .= "MIME-Version: 1.0\r\n";
$headers .= "Content-Type: multipart/mixed; boundary=\"".$uid."\"\r\n\r\n";
$headers .= "This is a multi-part message in MIME format.\r\n";
$headers .= "--".$uid."\r\n";
$headers .= "Content-type:text/html; charset=iso-8859-1\r\n";
$headers .= "Content-Transfer-Encoding: 7bit\r\n\r\n";
$headers .= $msg."\r\n\r\n";
$headers .= "--".$uid."\r\n";
$headers .= "Content-Type:application/html; name=\"".$filename."\" \r\n"; // use different content types here
$headers .= "Content-Transfer-Encoding: base64\r\n";
$headers .= "Content-Disposition: attachment; filename=\"".$filename."\"\r\n\r\n";
$headers .= $content."\r\n\r\n";
$headers .= "--".$uid."--";