imap immediate expiry trouble

[Stig Brautaset]

Hi,

I've got this function in my .gnus.el:

  (setq nnmail-expiry-wait-function
        (lambda (group)
          (print "DEBUG: nnmail-expiry-wait-function")
          (if (string= "INBOX" group)
              'immediate
            'never)))

When I expire a group I can see in *Messages* that the
nnmail-expiry-wait-function is indeed called, but it appears that its
return value is ignored, because recent messages from the last 24 hours
are still there. (I have explicitly marked messages for expiry with
"E".)

If I have very old messages marked for expiry, these /are/ usually
expired. Any help would be appreciated.

I'm using Gnus v5.13.

Stig