MobileMail.app crash

my mail push notifications are work.
my mail app checks incoming mails.
but if i am click the read mail, mail app not work.
it can't open any email.
and mail application gets stuck.

i think after dreamboard installed, mail app crashed.
Maybe Os X Lion theme problem.
i uninstall dreamboard but mail app did not improve.
please help me.

i think, if re install mobilemail.app, it can be repair.
how can i remove and re-install mail application?

i am using i4 ios 5.1.1 with jb.
I'm having this problem after installing the second time dreamboard

 

Does no one knows?