Display signature Image in email

Hi,
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I wanted to put a signature field in my form and have the image output in an email. So I place html like this in my email:
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<p><strong>Pilot Signature</strong></p>
<img src={data:pilotsig} 
       width="400" 
       height="150" alt="Pilot Signature" />

The field {data:pilotsig} contains the base64 encoded image data.
​
The signature image is displayed in the debugger email body section but the actual email displays only the alt= caption.
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I then tried copying the actual data from the signature field into the <img> src and got the same result - the debugger displays the image correctly but the actual email has a blank field.
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Can you see what I am doing wrong please?
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Thanks
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Tim

Base 64 encoded images do not work in many email clients, including GMail. You need to save the signature as an image and attach it to the email. I sell a sig-to-image plugin on my site.

So you are saying that I cannot actually have the image embedded in an email using a html <img > tag? It can only be an attachment?

You can
embed it with an img tag, you can't embedd it with an img tag where the src is a base64 string