Comment 4 for bug 1547949

Can confirm this is a problem with pantheon-mail 1.0.0+r1977+pkg7~daily~ubuntu0.4.1 from the daily PPA.
Changing the size back to a sane amount does not help at all and the setting gets reset whenever I try to start Mail.
This also makes the Xserver crash, due to the huge window size, so this basically breaks Mail from any usage.