why does salspasswd2 always append a realm?

[Marten Lehmann]

Hello,

I would like to insert an admin-user without a domain/realm into an 
sasldb2. But saslpasswd2 always appends the hostname to the userid I 
provide.

Example:

echo "test" | saslpasswd2 -c admin
sasldblistusers2
admin at localhost: userPassword

How can I avoid this? I have "virtdomains: userid" in my 
/etc/imapd.conf, but I need an admin-user without realm so that I manage 
all accounts with it, not just accounts within the same realm.

Regards
Marten