[mew-int 3012] how to reset cached imap and smtp passwords

Hi All - Is there a way to clear the cached IMAP or SMTP passwords in
MEW, for times when you change your password?

C-c-C-m seems to clear the master password, but sometimes that does not
trickle down properly to the IMAP and SMTP passwords.  (I am using an
exchange server.)

I currently turned off password caching and master password use (below
two commands), but would like to turn it back on assuming I can manually
clear the cached info.

(setq mew-use-cached-passwd nil)
(setq mew-use-master-passwd nil)

Any info people have would be greatly appreciated.

Thanks!
Jeff
---
Jeffrey M. Roth, Ph.D ~ Advanced Lasercom Systems and Operations Group ~
MIT Lincoln Laboratory ~ 244 Wood Street ~ Lexington, MA 02420 USA ~
781.981.3468(t)/.0143(f) ~ [email protected] ~ alum.mit.edu/www/roth