With the update to 11.48 with paper_lantern, the webmail interface is basically unusable. First, there is a hard-set iframe size. This causes a lot of scrolling outer/inner windows to get to top/bottom depending on the size of the window, or on larger windows, wasted space.
Also, much of the window is taken up by the fact that there is the paper_lantern header as well as the email reader header, then the email, then a footer and a paper_lantern footer.
If this header and footer are going to be there, they should be in place of the header/footer that's part of the email reader or they should be removed in favor of the email reader's header and footer. It would be easy enough to have a hamburger menu with the menu options offered by paper_lantern.
I have had several users that are webmail users asked to be taken back to X3 after the 11.48 release because of this - I don't really want to take their entire account back to X3, but I'm not aware of an alternative.