Allow any passwords from one host

[Ramprasad]

Hi,
  I am trying to design a custom mail archiving system for a cyrus
mailbox. 
My scripts will login to the cyrus mailbox and depending on rulesets
fetch the mails and store them to particular directories on a different
server


Now Is it possible to configure cyrus to allow any password  from a
trusted host. (Security is not an issue at all because imap is not open
from most ips except from webmail and archive server that too in a
trusted network)

Thanks
Ram