Configurer Autodiscover et Autoconfig

_autodiscover._tcp.yourdomain.com. 3600 IN SRV  10 10 443 mail.yourmx.com.

autodiscover.php

<?php
$postData = file_get_contents('php://input'); //Autodiscover requests are HTTP posts with XML content
$xml = simplexml_load_string($postData);
$user = $xml->Request->EMailAddress; //copy the email address from the request into a variable
 
//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">
<Response xmlns="http://schemas.microsoft.com/exchange/autodiscover/outlook/responseschema/2006a">
<Account>
<AccountType>email</AccountType>
<Action>settings</Action>
<Protocol>
<Type>POP3</Type>
<Server>mail.yourmx.com</Server>
<Port>995</Port>
<LoginName><?php echo $user; ?></LoginName>
<DomainRequired>off</DomainRequired>
<SPA>off</SPA>
<SSL>on</SSL>
<AuthRequired>on</AuthRequired>
<DomainRequired>on</DomainRequired>
</Protocol>
<Protocol>
<Type>IMAP</Type>
<Server>mail.yourmx.com</Server>
<Port>993</Port>
<DomainRequired>on</DomainRequired>
<LoginName><?php echo $user; ?></LoginName>
<SPA>off</SPA>
<SSL>on</SSL>
<Encryption>Auto</Encryption>
<AuthRequired>on</AuthRequired>
</Protocol>
<Protocol>
<Type>SMTP</Type>
<Server>mail.yourmx.com</Server>
<Port>587</Port>
<DomainRequired>on</DomainRequired>
<LoginName><?php echo $user; ?></LoginName>
<SPA>off</SPA>
<Encryption>Auto</Encryption> <!-- if your server requires encrypotion other than SSL -->
<AuthRequired>on</AuthRequired>
<UsePOPAuth>on</UsePOPAuth>
<SMTPLast>off</SMTPLast>
</Protocol>
</Account>
</Response>
</Autodiscover>

ServerAlias autoconfig.*
RewriteEngine On
RewriteCond %{HTTPS} !on [OR]
RewriteCond %{HTTP_HOST} !^discover\.my-service\.com$
RewriteRule ^(.*)$ https://discover.my-service.com$1 [R=301]

Remember to get a SIGNED SSL Cert.

config-v1.1.xml

<?xml version="1.0" encoding="UTF-8"?>
 
<clientConfig version="1.1">
    <emailProvider id="domain.tld">
        <domain>domain.tld</domain>
        <displayName>Mail</displayName>
        <displayShortName>Mail</displayShortName>
        <incomingServer type="pop3">
            <hostname>mailserver.domain.tld</hostname>
            <port>995</port>
            <socketType>SSL</socketType>
            <authentication>password-cleartext</authentication>
            <username>%EMAILADDRESS%</username>
            <pop3>
                <leaveMessagesOnServer>true</leaveMessagesOnServer>
                <downloadOnBiff>true</downloadOnBiff>
                <daysToLeaveMessagesOnServer>10</daysToLeaveMessagesOnServer>
            </pop3>
        </incomingServer>
        <incomingServer type="imap">
            <hostname>mailserver.domain.tld</hostname>
            <port>993</port>
            <socketType>SSL</socketType>
            <authentication>password-cleartext</authentication>
            <username>%EMAILADDRESS%</username>
        </incomingServer>
        <outgoingServer type="smtp">
            <hostname>mailserver.domain.tld</hostname>
            <port>587</port>
            <socketType>STARTTLS</socketType>
            <authentication>password-cleartext</authentication>
            <username>%EMAILADDRESS%</username>
        </outgoingServer>
    </emailProvider>
</clientConfig>