cmailapp-webhook.php

<?php
/*
A payload like the following is POSTed to your webhook

{
	"id": "AD38DBD002",
	"domain": "yourdomain.ch",
	"from": "you@yourdomain.ch",
	"to": "some.name@example.com",
	"status": "sent",
	"subject": "Ihre_Anmeldung_zur_Aktion\u00e4rsveranstaltung",
	"time": "2021-04-15 12:32:51",
	"message": "status=sent (250 2.6.0 <YonMDtQuAqcWksZ8IAy3frMj7NF1xhgZ2WRFnHhXQ@example.com> [InternalId=21285857929951, Hostname=AM0PR02MB4034.eurprd02.prod.outlook.com] 38901 bytes in 0.840, 45.187 KB\/sec Queued mail for delivery)"
}
    
*/
    
// Reading that payload in PHP is as simple as that
$inputJSON = file_get_contents('php://input');
$data = json_decode($inputJSON, true);

// Now $data would contain an assoc array of id, domain, from etc.
// Be aware, that "message" contains the answer of the remote MTA. Some MTA tell you what the problem with a bounce is
// it can be, that the mailbox doesn't exist, is full, marked the mail as spam etc.