Hey Ray!
I had a look at our current code base and the action url is:

<?php echo JRoute::_('index.php?option=com_cmc&format=raw&task=subscription.save'); ?>

Joomla then decides how it should look in the html of the page and if it should have the http or https in front of that.
I don't remember what we had in version 1.3, but this is what we have in verslon 1.5, so maybe update to it? Your other option would be to create a template override and to hardcode the url in the module.

Regards,
Daniel

Hi Daniel ,
That looks like the same code I found in 1.3.1 in the default.php file
<form action="<?php echo JRoute::_('index.php?option=com_cmc&format=raw&task=subscription.save');?>"
but SSL is enabled in Joomla's Global Configuration settings, why would Joomla use a http url? The url before the index.php?option is not a site url it is like this;
<form id="mc-embedded-subscribe-form" class="validate" novalidate="" target="_blank" name="mc-embedded-subscribe-form" method="post" action="http://ourdomain.us4.list-manage.com/subscribe/post?u=***********************************">
So it is a "manage.com" domain url. I don't know where CMC is getting that domain but the one it has in its Webhooks field is a https url.
Thanks for looking at this,
Ray

the code that you've pasted doesn't come from cmc. you've added another module to your site for subscriptions.

Hi Daniel,
I am very sorry to have taken up your time, the site has CMC 1.3.1 installed but the newsletter sigin-up is in a custom module I have now found.
Thank you
Ray