[horde] How do i Raise the attachment size to >2mb

[jasonlee]

i use redhat, and i have sendmail installed...
i configured /etc/mail/sendmail.mc so that it will accept files greated than 
10mb..
however when i used imp, and tried to attach a file that is 4 mb in size, it 
gave me an error saying that it exceeds the maximum mail size of 2 mb...
i am gussing that somewhere in the imp configuration file there is an option i 
can set it ..
I tried to find it, but i cant.. 
help plz! :)
-- 
God Bless~