autodiscover.xml generation via php - based on github.com/Radiergummi/php-autodiscover

.htaccess

RewriteEngine On
RewriteRule ^autodiscover.xml$ autodiscover.php [NC,L]

autodiscover.php

<?
$valid_mx_host = "w0108377.kasserver.com";

//get raw POST data so we can extract the email address
$data = file_get_contents("php://input");

// retrieve email address from client request
preg_match("/\<EMailAddress\>(.*?)\<\/EMailAddress\>/", $data, $email);
$email = $email[1];

// get domain from email address
$domain = substr(strrchr($email, "@"), 1);
if (empty($domain)) {
	http_response_code(404);
	exit;
}

$mx_hosts = dns_get_record($domain, DNS_MX);
if (empty($mx_hosts) || count($mx_hosts) > 1 || $valid_mx_host !== $mx_hosts[0]["target"]) {
	http_response_code(404);
	exit;
}

// POP settings
$popServer = $valid_mx_host;
$popPort = '995';
$popSSL = 'on';

// IMAP settings
$imapServer = $valid_mx_host;
$imapPort = '993';
$imapSSL = 'on';

// SMTP settings
$smtpServer = $valid_mx_host;
$smtpPort = '587';
$smtpSSL = 'TLS';


//set Content-Type
header("Content-Type: application/xml");
?>
<?php echo '<?xml version="1.0" encoding="utf-8" ?>'; ?>
<Autodiscover xmlns="http://schemas.microsoft.com/exchange/autodiscover/responseschema/2006" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="$
        <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 $imapServer ?></Server>
                                <Port><?php echo $imapPort ?></Port>
                                <DomainRequired>off</DomainRequired>
                                <LoginName><?php echo $email ?></LoginName>
                                <SPA>off</SPA>
                                <SSL><?php echo $imapSSL ?></SSL>
                                <AuthRequired>on</AuthRequired>
                        </Protocol>
                        <Protocol>
                                <Type>POP3</Type>
                                <Server><?php echo $popServer ?></Server>
                                <Port><?php echo $popPort ?></Port>
                                <LoginName><?php echo $email ?></LoginName>
                                <DomainRequired>off</DomainRequired>
                                <SPA>off</SPA>
                                <SSL><?php echo $popSSL ?></SSL>
                        </Protocol>
                        <Protocol>
                                <Type>SMTP</Type>
                                <Server><?php echo $smtpServer ?></Server>
                                <Port><?php echo $smtpPort ?></Port>
                                <DomainRequired>off</DomainRequired>
                                <LoginName><?php echo $email ?></LoginName>
                                <SPA>off</SPA>
                                <AuthRequired>on</AuthRequired>
                                <UsePOPAuth>on</UsePOPAuth>
				<?php echo $smtpSSL == 'TLS' ? '<Encryption>TLS</Encryption>' : '<SSL>' . $smtpSSL . '</SSL>' ?>
                        </Protocol>
                </Account>
        </Response>
</Autodiscover>