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> I am looking for a webpage script or programme to let users to delete
> their own account. Do anyone have any idea about that? Thank you very
Do you really want a web interface for solely letting users delete their
account? Why should they do so? Or are you looking for a function to
integrate into an existing web environment?
In either case, simply let the user log in (= check his password), then
issue "vdeluser <user>@domain.tld", e.g. with a system() command or
using the vpopmail API, and done. Don't forget to kick the user out of
the web interface immediately, as he doesn't have any more privileges.