First Excuse my Outlook 2000, corp standard.
The only files you need to be concerned with for virtual hosts using
vpopmail:
/var/qmail/control/rcthosts
metta.lk
/var/qmail/control/virtualdomains
metta.lk:metta.lk
/var/qmail/users/assign
+metta.lk-:metta.lk:512:5002:/home/vpopmail/domains/metta.lk:-::
/home/vpopmail/domains/metta.lk/vpasswd
relevant password entries
All of these changes would have been made if you added the domain with
~vpopmail/bin/vadddomain metta.lk
I would suggest deleting the domain ~vpopmail/bin/vdeldomain metta.lk
and readding it, something is severely screwed up.