Cyrus IMAP 2.2 - other user not allowed to proxy

[John/SML]

Hi,

I am using Cyrus IMAP 2.2.13 binary built from Ubuntu 8.04 with SASL 
GSSAPI / Kerberos authentication (SASL 2.1.22). When I set authorization 
(SAM) to allow another user to access one's mailbox, he failed and the 
system log read "user is not allowed to proxy...". The original user could 
access without any problem, and both users are of the same domain. 

I hope someone could advise what when wrong.

Thanks a lot.

John Mok

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