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Hey there! We actually just had a visitor from our engineering team go into some fantastic detail about why this happens - you can take a look at the whole thread here: Text Message via Email.
The main takeaway for a workaround is to try to force the message to come through as MMS - there are some suggestions as to how to accomplish this on that thread as well. Do you have the option to add a subject line to the email, include a picture, or ensure that the email body is longer than 160 characters?