I have a custom notification function for our comments editor, who prefers to have all comments from one article threaded together in her email client. To achieve this, I'm creating a custom message-ID for the first comment on an article, then setting that as the In-Reply-To for future comment notifications.
This is working to some extent - I can see the additional headers in the mail client - however, the first message is being created with TWO Message-IDs. In other words, the one I passed into the headers is NOT overriding the one Wordpress is autogenerating. Therefore, the threading doesn't work.
Is this a bug with Wordpress? I don't want to resort to hunting down the actual WP_mail function and editing core code; and I'm not sure that would even work. Is this something more fundamental with PHP Mail function that I can't change perhaps?
$messageIDtoCreate = $post->ID.".".time(); // post ID, and current timestamp
add_post_meta( $post->ID, 'messageID', $messageIDtoCreate);
// add to the email headers
$message_headers .= "Message-ID: <".$messageIDtoCreate."@test>\n";
Thanks in advance.
I have a custom notification function for our comments editor, who prefers to have all comments from one article threaded together in her email client. To achieve this, I'm creating a custom message-ID for the first comment on an article, then setting that as the In-Reply-To for future comment notifications.
This is working to some extent - I can see the additional headers in the mail client - however, the first message is being created with TWO Message-IDs. In other words, the one I passed into the headers is NOT overriding the one Wordpress is autogenerating. Therefore, the threading doesn't work.
Is this a bug with Wordpress? I don't want to resort to hunting down the actual WP_mail function and editing core code; and I'm not sure that would even work. Is this something more fundamental with PHP Mail function that I can't change perhaps?
$messageIDtoCreate = $post->ID.".".time(); // post ID, and current timestamp
add_post_meta( $post->ID, 'messageID', $messageIDtoCreate);
// add to the email headers
$message_headers .= "Message-ID: <".$messageIDtoCreate."@test>\n";
Thanks in advance.
Share Improve this question asked May 18, 2012 at 9:37 James BruceJames Bruce 2593 silver badges7 bronze badges3 Answers
Reset to default 6You can filter the $phpmailer object. Something like this should do the trick (not tested):
add_action( 'phpmailer_init', 'wpse_52555_msg_id' );
function wpse_52555_msg_id( &$phpmailer )
{
$msg_id = get_post_meta( get_the_ID(), 'messageID', TRUE );
'' !== $msg_id and $phpmailer->MessageID = $msg_id . '@test';
}
Anyone looking to just update the hostname inside the messageID, which may be needed for Nginx setup. Wordpress documentation.
add_action('phpmailer_init', 'sender_message_id');
function sender_message_id(&$phpmailer) {
$phpmailer->Hostname = 'domain';
}
I think I found the solution to the initial problem.
You must, of course, use the phpmailer_init action to change the message-ID property of object phpmailer (used by wp_mail function). Thanks to Fuxia for the answer.
It is also necessary to respect message-ID format in accordance with the rfc5322 section-3.6.4 otherwise your new message-ID will be rejected (consult here the source file of phpmailer where the message-ID is setted).
Here is the correct format of a message-ID : <leftpart@rightpart> including brackets
Here is the code tested that works:
add_action('phpmailer_init', 'set_message_id');
function set_message_id(&$phpmailer) {
$leftpart = 'mycustominfo-'.uniqid();
$domain = 'mydomain';
$messageID = '<'.$leftpart.'@'.$domain.'>';
$phpmailer->MessageID = $messageID;
}
I hope it will help