Trusted Email Services

From Halon, SMTP software for hosting providers
Revision as of 15:12, 14 March 2016 by Erik (talk | contribs) (Mail Submission)
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function tes_check_client_policy()
{
    global 
$saslauthed$tlsstarted$tlsprotocol;
    if (!
$tlsstarted)
        return 
false;
    if (
$tlsprotocol == "SSLv2" or
        
$tlsprotocol == "SSLv3" or
        
$tlsprotocol == "TLSv1")
        return 
false;
    if (!
$saslauthed)
        return 
false;
    return 
true;
}
function 
tes_check_member_server_policy()
{
    global 
$tlsstarted$tlsprotocol$tlsciphers$tlskeysize;
    if (!
$tlsstarted)
        return 
false;
    if (
$tlsprotocol == "SSLv2" or
        
$tlsprotocol == "SSLv3" or
        
$tlsprotocol == "TLSv1" or
        
$tlsprotocol == "TLSv1.1")
        return 
false;
    return 
true;
}
function 
tes_check_nonmember_server_policy()
{
    global 
$tlsstarted$tlsprotocol$tlsciphers$tlskeysize;

Mail Submission

On client submission port (587) use the following script.

if (!tes_check_client_policy())
    
Reject("Client is not TES compliant"); 

And the following configuration:

  • Listener setting
    • A TLS certificate
    • A auth flow
    • Require TLS for AUTH

DKIMSign($selector$senderdomain$rsakey); 

if (tes_is_member($recipientdomain))
{
    
SetTLS([
        
"tls_protocols" => "!SSLv2,!SSLv3,!TLSv1,!TLSv1.1",
        
"tls" => "dane_require"
    
]);

Mail Relay

Use the following script.

if (tes_is_member())
{
    if (!
tes_check_member_server_policy())
        
Reject("Member is not TES compliant");
}
else
{
    if (!
tes_check_nonmember_server_policy())
        
Reject("Server is not TES compliant");

$result DKIMSDID([$senderdomain]);
if (
$result[$senderdomain] != "pass")
 
Reject();
AddHeader("X-TES-Status"tes_is_member()?"member":"non-member");