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Add base64-econded images ad attachment

Hi,

We're trying to add an image as an attachment that will be embedded in the email using base64 encoding. This will be used in a transactional email sent by the message center; the service calling MC will provide all the information needed:
- file name

- cid

- encoded data

We tried to add an additional SMTP Header with the option provided by default in the delivery. The additional header was looking like this:

Content-Type: image/png; name="sig.png"
Content-Disposition: inline; filename="sig.png"
Content-Transfer-Encoding: base64
Content-ID: <0123456789>
Content-Location: sig.png 

base64 data

but it doesn't work (also this completely broke the delivery body).

How can we achive our goal, considering that this is the only way the image can be provided to the Message Center?

Thank you.

Guglielmo

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