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    Did you ever get anywhere with this?
I just created a simple block to allow my members to subscribe to two GNU Mailman mailing lists by clicking on a submit button.
I would be very interested to know if you got any more integration.
Here is my very simple block for subscribing:
 global $xoopsUser; 
 
if (is_object($xoopsUser)) { 
    $email = $xoopsUser->getVar('email'); 
} 
 
echo "Click to subscribe"; 
echo '; 
echo '; 
echo $email; 
echo '">'; 
echo ''; 
echo '';  
This brings up a minor bug with the XOOPS 2.2.x custom php block method - you cannot use \ to escape things! When you submit the page it comes back without the \ . eg. using \" doesn't work.