I have opened a ticket with HTC in regards to MMS over compressing attachments to send and got this initial response:
"We are sorry to hear that you are experiencing issues with the MMS on your HTC One. While we can certainly see what options are available to resolve the issue, we have no known issues with the application supposedly over-compressing pictures and compromising the quality of the image. There are a few steps that we can take to help resolve the issue.
To start, we will need to compare two different pictures sent via MMS. To start, send one picture through MMS that has already been taken and saved to the Gallery. From there, open Messages to send another MMS but this time, tap the attach option and select camera. Take the picture then and send it. Once both images have been received by the same device, see if there is any difference in quality.
In addition, we can clear data from the Messages application itself. From the Home screen, open the application list and tap Settings>Apps>All. Locate and select Messages followed by Clear Data and, if available, Force Stop. Once done, you can then perform a soft reset by pressing and holding the power button for approximately one minute. This will not remove any personal information but will ensure the software is properly rebooted. Then power the phone on and test the MMS again.
Feel free to reply should you have any further questions. If you feel more comfortable discussing issues by phone, you can contact Technical Support at 1-866-449-8358, 8 am to 1 am ET, 7 days a week.
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Sincerely,
Dayton
HTC"
Something about the use of the word "supposedly" has really ticked me off.