hardquata problem

[hari_bhr]

hi all   i was running qmail+mysql+vpopmail+sqwebmail+qmailadmin on linux 6.2 its working fine, with out any problem past 4 months i got virtual hosts lot of. each mail box default 5MB   what i have required is. in one of the virtual host user required more than 5 mb how do i allocate for the specific user. how do i specify for the hole domain is x MB, it share all the users.   any help will appriciate