cyradm mailbox creation behaving differently if using CRAM-MD5 or DIGEST-MD5 auth

[OpenMacNews]

hi all,

after building:

	cyrus-sasl-2.1.20
	cyrus-imapd-2.2.10
		w/ patches from http://email.uoa.gr/projects/cyrus/
			cyrus-imapd-2.2.10-autocreate-0.1.diff
			cyrus-imapd-2.2.10-rmquota-0.1.diff
			cyrus-imapd-2.2.10-deletemailbox-0.1.diff
			cyrus-imapd-2.2.10-autosieve-0.1.diff

on OSX 10.3.7, i'm finding cyradm behaves differently when using CRAM-MD5 vs 
DIGEST-MD5 authentication.

i've created in sasldb2 an admin user (my.admin) for my canonical domain 
(devbox.internal.testdomain.com):

% echo blahblah | saslpasswd2 -p -c -u devbox.internal.testdomain.com my.admin

veifying:

% sasldblistusers2
		my.admin at devbox.internal.testdomain.com: userPassword



now, if i use cyradm with DIGEST-MD5 auth:

% cyradm --auth DIGEST-MD5 --user my.admin at devbox.internal.testdomain.com 
--server devbox.internal.testdomain.com --port 143

and attempt to create a new virutal user at domain

	devbox.internal.testdomain.com> cm userA at testdomainA.com

all is OK.

	devbox.internal.testdomain.com> lm
		userA at testdomainA.com (\HasNoChildren)



however, if i start over, and do the same with CRAM-MD5

% cyradm --auth CRAM-MD5 --user my.admin at devbox.internal.testdomain.com 
--server devbox.internal.testdomain.com --port 143

	devbox.internal.testdomain.com> cm userB at testdomainB.com

i get an ERROR:

		createmailbox: Invalid mailbox name

but, if i add the canonical domain (realm?) ...

	devbox.internal.testdomain.com> cm 
userB at testdomainB.com@devbox.internal.testdomain.com

it now works as expected:

	devbox.internal.testdomain.com> lm
		userB at testdomainB.com (\HasNoChildren)

############
## QUESTION
#

why the different behavior -- DIGEST-MD5 requiring the additional domain/realm? 
is this expected behavior, or a BUG?

thx!

richard
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