Kostya,
I discovered a "feature" of the this version that is related to the recently introduced change.
At least on my Razr M, once I download the attached images, they show up as large (larger than before) thumbnails: For the vertical orientation, they take the entire width, for the horizontal orientation, they are two in a row. In both cases, there is a fixed ratio.
If the images are in landscape orientation, that seem to be [mostly] fine. But when the image is in portrait orientation, it is essentially converted in that thumbnail to landscape by cutting off the top and the bottom. (and that happens to landscape-oriented images too, if the ratio is different from yours) It looks like you thought of an "optimum" ratio, and then you are cutting all photos to this Procrustes bed.
In many cases, that negates at least one idea of the thumbnails: to be able to see the images inside Aquamail without opening them in an external program.
(One might argue that the idea is only to identify the image. - While that is a valid one, I would claim that if you are trying to make the thumbnail larger than it was before, my use logic is more applicable.)
I'd rather have the image not filling the entire width (or half-width for the landscape phone orientation), but being displayed in full.