notify_no.c: check for empty mailbox

[Christoph R]

Hello everyone!

Im currently trying to customize the notify_no.c file.
But I only want to trigger some action if the mailbox
the current mail is being delivered to, is empty.
I guess there should be some function to call for this
info.
What I'm looking for is a "inhouse" way to check for
the status of a mailbox. I don't want to store
user password in plaintext just to let some stupid
script log into their mailbox to see if it's empty.

Any help is really appreciated.

Best regards, 
Christoph Riedl