Excel charts sent via email do not show on mobile devices

Hi all,

First post, apologies in advance if this has been answered elsewhere but I could not find a solution to my specific issue.

So I have an Excel 2010 file, on a single sheet I have five charts which get updated and sent to a distribution list every morning. Process in code is to export each of the charts to a temporary directory as .png format, build a html body (referencing the files in cid format) and display the email to check over and send. When the email is viewed in Outlook, the images are displayed correctly, however when viewed form a mobile the user gets empty boxes with "cid:chartname.png" in the top left corner of each box.

Everywhere else I have looked, people seem to be having trouble getting the files attached, which is not the case here, it seems to be compatibility issues with mobile devices (although I'd gladly admit I'm wrong if someone could point me in the right direction).

Code is as follows:

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Any help would be greatly appreciated

Well,

Took me a while but I found the solution. In case anyone needs it for future use:

The trick was to add a mime type and content ID tag to each attachment, without these the email basically doesn't know what to do with them:

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