mailcow/data/web/autodiscover.php

<?php
header("Content-Type: application/xml");
require_once "inc/vars.inc.php";
$config = array(
     'useEASforOutlook' => 'yes',
     'autodiscoverType' => 'activesync',
     'imap' => array(
       'server' => $mailcow_hostname,
       'port' => '993',
       'ssl' => 'on',
     ),
     'smtp' => array(
       'server' => $mailcow_hostname,
       'port' => '465',
       'ssl' => 'on'
     ),
     'activesync' => array(
       'url' => 'https://' . $mailcow_hostname . '/Microsoft-Server-ActiveSync'
     )
);
// If useEASforOutlook == no, the autodiscoverType option will be replaced to imap.
if ($config['useEASforOutlook'] == 'no') {
	if (strpos($_SERVER['HTTP_USER_AGENT'], 'Outlook')) {
		$config['autodiscoverType'] = 'imap';
	}
}
// Workaround for short open tags
echo '<?xml version="1.0" encoding="utf-8" ?>';
?>
<Autodiscover xmlns="http://schemas.microsoft.com/exchange/autodiscover/responseschema/2006">
<?php
$data = trim(file_get_contents("php://input"));
if(!$data) {
        list($usec, $sec) = explode(' ', microtime());
        echo '<Response>';
        echo '<Error Time="' . date('H:i:s', $sec) . substr($usec, 0, strlen($usec) - 2) . '" Id="2477272013">';
        echo '<ErrorCode>600</ErrorCode><Message>Invalid Request</Message><DebugData /></Error>';
        echo '</Response>';
        echo '</Autodiscover>';
        exit(0);
}

$discover = new SimpleXMLElement($data);
$email = $discover->Request->EMailAddress;

if ($config['autodiscoverType'] == 'imap') {
?>
<Response xmlns="http://schemas.microsoft.com/exchange/autodiscover/outlook/responseschema/2006a">
    <Account>
        <AccountType>email</AccountType>
        <Action>settings</Action>
        <Protocol>
            <Type>IMAP</Type>
            <Server><?php echo $config['imap']['server']; ?></Server>
            <Port><?php echo $config['imap']['port']; ?></Port>
            <DomainRequired>off</DomainRequired>
            <LoginName><?php echo $email; ?></LoginName>
            <SPA>off</SPA>
            <SSL><?php echo $config['imap']['ssl']; ?></SSL>
            <AuthRequired>on</AuthRequired>
        </Protocol>
        <Protocol>
            <Type>SMTP</Type>
            <Server><?php echo $config['smtp']['server']; ?></Server>
            <Port><?php echo $config['smtp']['port']; ?></Port>
            <DomainRequired>off</DomainRequired>
            <LoginName><?php echo $email; ?></LoginName>
            <SPA>off</SPA>
            <SSL><?php echo $config['smtp']['ssl']; ?></SSL>
            <AuthRequired>on</AuthRequired>
            <UsePOPAuth>on</UsePOPAuth>
            <SMTPLast>off</SMTPLast>
        </Protocol>
    </Account>
</Response>
<?php
}
else if ($config['autodiscoverType'] == 'activesync') {
	$dsn = "$database_type:host=$database_host;dbname=$database_name";
	$opt = [
	    PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,
	    PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
	    PDO::ATTR_EMULATE_PREPARES   => false,
	];
	$pdo = new PDO($dsn, $database_user, $database_pass, $opt);
	$username = trim($email);
	try {
		$stmt = $pdo->prepare("SELECT `name` FROM `mailbox` WHERE `username`= :username");
		$stmt->execute(array(':username' => $username));
		$MailboxData = $stmt->fetch(PDO::FETCH_ASSOC);
	}
	catch(PDOException $e) {
		die("Failed to determine name from SQL");
	}
	if (!empty($MailboxData['name'])) {
		$displayname = utf8_encode($MailboxData['name']);
	}
	else {
		$displayname = $email;
	}
?>
<Response xmlns="http://schemas.microsoft.com/exchange/autodiscover/mobilesync/responseschema/2006">
    <Culture>en:en</Culture>
    <User>
        <DisplayName><?php echo $displayname; ?></DisplayName>
        <EMailAddress><?php echo $email; ?></EMailAddress>
    </User>
    <Action>
        <Settings>
            <Server>
                <Type>MobileSync</Type>
                <Url><?php echo $config['activesync']['url']; ?></Url>
                <Name><?php echo $config['activesync']['url']; ?></Name>
            </Server>
        </Settings>
    </Action>
</Response>
<?php
}
?>
</Autodiscover>