Can't authorize as different user in cyradm and sieveshell

[Michael Ulitskiy]

Hello,

I'm playing with cyrus-imap 2.5.10 and cyrus-sasl 2.1.26.
i'm trying to use sieveshell to setup users sieve scripts, but since 
i don't know users passwords i want to use a special user for authentication
and authorize as the target user.
Here's what I have.

imapd.conf:
admins: mailadmin
proxyservers: proxyadmin
sasl_pwcheck_method: saslauthd
#sasl_pwcheck_method: alwaystrue
sasl_mech_list: PLAIN
allowplaintext: yes

here's what i do:

root at rway-imap-vm:~# sieveshell -a proxyadmin -u t4 at virtualcrap.com localhost
connecting to localhost
Please enter your password: 
unable to connect to server at /usr/bin/sieveshell line 191, <STDIN> line 1.

here's the log:
Nov 17 18:24:44 rway-imap-vm sieve[2256]: TLS is available.
Nov 17 18:24:46 rway-imap-vm saslauthd[1169]: pam_userdb(sieve:auth): user 'proxyadmin' granted access
Nov 17 18:24:46 rway-imap-vm sieve[2256]: badlogin: localhost [127.0.0.1] PLAIN no mechanism available
Nov 17 18:24:46 rway-imap-vm sieve[2256]: Lost connection to client -- exiting

as you can see user proxyadmin authenticated successfully, but then something (authorization?) went wrong 
and it says "PLAIN no mechanism available". 
this only happens if i try to authorize as different user. if i don't everything works fine:

root at rway-imap-vm:~# sieveshell -a t4 at virtualcrap.com -u t4 at virtualcrap.com localhost
connecting to localhost
Please enter your password: 
> 

log:
Nov 17 18:24:11 rway-imap-vm sieve[2247]: TLS is available.
Nov 17 18:24:15 rway-imap-vm saslauthd[1167]: pam_userdb(sieve:auth): user 't4 at virtualcrap.com' granted access
Nov 17 18:24:15 rway-imap-vm sieve[2247]: login: localhost [127.0.0.1] t4 at virtualcrap.com PLAIN User logged in

the same happends to cyradm:
root at rway-imap-vm:~# cyradm --user=proxyadmin --authz=t4 at virtualcrap.com --auth=plain localhost
Password: 
IMAP Password: 

log:
Nov 17 18:26:27 rway-imap-vm saslauthd[1166]: pam_userdb(imap:auth): user 'proxyadmin' granted access
Nov 17 18:26:27 rway-imap-vm imap[2277]: badlogin: localhost [127.0.0.1] PLAIN [SASL(-4): no mechanism available: Unable to find a callback: 32773]

but ok without trying to authorize as different user:
root at rway-imap-vm:~# cyradm --user=t4 at virtualcrap.com --auth=plain localhost
Password: 
localhost> 
Nov 17 18:27:31 rway-imap-vm saslauthd[1167]: pam_userdb(imap:auth): user 't4 at virtualcrap.com' granted access
Nov 17 18:27:31 rway-imap-vm imap[2276]: login: localhost [127.0.0.1] t4 at virtualcrap.com PLAIN User logged in SESSIONID=<rway-imap.aceinnovative.com-2276-1479425249-1-16233364852996823733>

Can somebody tell me what I am doing wrong?
Thanks a lot,

Michael
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