Small addon that will convert PNG images to JPEG if they are larger than the maximum allowed attachment filesize.
Please note that transparency will be lost in this case.
I did implement code to detect transparency and ignore the file if it does contain transparency, but that quite simply does...
Converts all hot linked images to attachments.
The Convert image all add-on will convert hot linked images in messages to attachments. Hot linked images are those images that have been inserted using the Image icon in the editor toolbar.
(Example of hot linked image)