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MMS via Email Problem with Sendgrid or Mandrill

I'm trying to use the email service to send MMS messages.

I'm sending the email to {number}​ by attaching a JPEG file.

When I use my email client with my Gmail account it successfully sends the message. But when I use a service like Sendgrid or Mandrill the message is not sent and I receive a bounce message:

Subject:Undeliverable Message

Content-Type: multipart/mixed; boundary="----=ThisIsTheBoundaryStringaaa"


Content-Type: text/plain; charset=US-ASCII

Message could not be delivered to mobile.


Notice that the Error message is also empty!

What could be wrong?

Any help would be appreciated.

Thanks in advance!

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