I have added a picture as a signature by using html in the disclaimer transport rule by appending the following
<!DOCTYPE html>
<html>
<head>
<style>
img {
width:100%;
}
</style>
</head>
<body>
<img src="https://picturelink.domain" alt="HTML5 Icon" style="width:60px;height:60px;">
</body>
</html>
I added exception for messages that have the words RE: or FW: to solve duplicate signiture problem, but sometimes users remove these words from the subject and the result is double sign.
Is there any way to add exception if the message already have the html signiture ??