shared mailboxes - all so present on the web - no light yet

[Martin Marcher]

Hello,

I just created a shared mailbox where users can subscribe and post to  
by addressing +shared at example.com mail gets delivered correctly. But  
I'm trying to achieve that user+shared at example.com gets delivered to  
this shared mailbox.

I just googled a few hours but couldn't find any pointers on how to  
do that. It also seems that sieve isn't an option since from what I  
found on the web shared mailboxes and sieve work together from  
 >=cyrus-2.3

Any pointers on how to do that would be helpfull.

I attached to log sessions, one where I successfully post to  
+shared at example.com and one where I post (unsuccessfully) to user 
+shared at example.com (the message is delivered to the users inbox).

\martin

Log excerpts (mailto:+shared at example.com):
Dec 13 04:14:34 localhost postfix/smtpd[10519]: C1B56152F8A9:  
client=demo.example.com[192.168.0.1], sasl_method=PLAIN,  
sasl_username=user at example.com
Dec 13 04:14:34 localhost postfix/cleanup[10581]: C1B56152F8A9:  
message-id=<21A63CE6-6F32-4562-BB84-0701CCEE6514 at example.com>
Dec 13 04:14:34 localhost postfix/qmgr[8829]: C1B56152F8A9:  
from=<user at example.com>, size=601, nrcpt=1 (queue active)
Dec 13 04:14:34 localhost cyrus/imap[10572]: open: user  
user at example.com opened INBOX/Sent
Dec 13 04:14:35 localhost postfix/smtpd[10589]: connect from  
localhost.openforce.lan[127.0.0.1]
Dec 13 04:14:36 localhost postfix/smtpd[10589]: 0660B152F8AD:  
client=localhost.openforce.lan[127.0.0.1]
Dec 13 04:14:36 localhost postfix/cleanup[10581]: 0660B152F8AD:  
message-id=<21A63CE6-6F32-4562-BB84-0701CCEE6514 at example.com>
Dec 13 04:14:36 localhost postfix/qmgr[8829]: 0660B152F8AD:  
from=<user at example.com>, size=988, nrcpt=1 (queue active)
Dec 13 04:14:36 localhost cyrus/master[10592]: about to exec /usr/lib/ 
cyrus/bin/lmtpd
Dec 13 04:14:36 localhost cyrus/lmtp[9685]: accepted connection
Dec 13 04:14:36 localhost cyrus/lmtp[9685]: connection from  
localhost.openforce.lan [127.0.0.1] preauth'd as postman
Dec 13 04:14:36 localhost cyrus/lmtp[10592]: executed
Dec 13 04:14:36 localhost cyrus/lmtp[9685]: duplicate_check:  
<21A63CE6-6F32-4562-BB84-0701CCEE6514 at example.com> example.com!shared  0
Dec 13 04:14:36 localhost cyrus/lmtp[9685]: duplicate_check:  
<21A63CE6-6F32-4562-BB84-0701CCEE6514 at example.com> example.com!shared  0
Dec 13 04:14:36 localhost cyrus/lmtp[9685]: mystore: starting txn  
2147483758
Dec 13 04:14:36 localhost cyrus/lmtp[9685]: mystore: committing txn  
2147483758
Dec 13 04:14:36 localhost cyrus/lmtp[9685]: duplicate_mark:  
<21A63CE6-6F32-4562-BB84-0701CCEE6514 at example.com> example.com! 
shared  1165979676 140737486810112
Dec 13 04:14:36 localhost cyrus/lmtp[9685]: Delivered:  
<21A63CE6-6F32-4562-BB84-0701CCEE6514 at example.com> to mailbox:  
example.com!shared
Dec 13 04:14:36 localhost postfix/lmtp[10591]: 0660B152F8AD: to=< 
+shared at example.com>, relay=127.0.0.1[127.0.0.1]:24, delay=0.16,  
delays=0.12/0.01/0.02/0, dsn=2.1.5, status=sent (250 2.1.5 Ok)
Dec 13 04:14:36 localhost postfix/qmgr[8829]: 0660B152F8AD: removed
Dec 13 04:14:36 localhost postfix/smtpd[10589]: disconnect from  
localhost.example.com[127.0.0.1]
Dec 13 04:14:36 localhost postfix/lmtp[10582]: C1B56152F8A9: to=< 
+shared at example.com>, orig_to=<+shared at example.com>, relay=127.0.0.1 
[127.0.0.1]:10024, delay=1.4, delays=0.05/0/0.04/1.3, dsn=2.6.0,  
status=sent (250 2.6.0 <+shared at example.com> Message accepted for  
delivery)
Dec 13 04:14:36 localhost postfix/qmgr[8829]: C1B56152F8A9: removed

Log excerpts (mailto:user+shared at example.com):
Dec 13 04:21:38 localhost postfix/smtpd[10630]: connect from  
demo.example.com[192.168.0.1]
Dec 13 04:21:38 localhost postfix/smtpd[10630]: 6C35F152F8A9:  
client=demo.example.com[192.168.0.1], sasl_method=PLAIN,  
sasl_username=user at example.com
Dec 13 04:21:38 localhost postfix/cleanup[10646]: 6C35F152F8A9:  
resent-message-id=<7B20542C-21EF-4ECF-96A6-007970F19640 at example.com>
Dec 13 04:21:38 localhost postfix/cleanup[10646]: 6C35F152F8A9:  
message-id=<92AFD72F-5C46-45BB-9667-2A69910990BC at example.com>
Dec 13 04:21:38 localhost postfix/qmgr[8829]: 6C35F152F8A9:  
from=<user at example.com>, size=858, nrcpt=1 (queue active)
Dec 13 04:21:38 localhost cyrus/imap[10605]: open: user  
user at example.com opened INBOX/Sent
Dec 13 04:21:39 localhost postfix/smtpd[10649]: connect from  
localhost.example.com[127.0.0.1]
Dec 13 04:21:39 localhost postfix/smtpd[10649]: 23A93152F8AD:  
client=localhost.example.com[127.0.0.1]
Dec 13 04:21:39 localhost postfix/cleanup[10646]: 23A93152F8AD:  
resent-message-id=<7B20542C-21EF-4ECF-96A6-007970F19640 at example.com>
Dec 13 04:21:39 localhost postfix/cleanup[10646]: 23A93152F8AD:  
message-id=<92AFD72F-5C46-45BB-9667-2A69910990BC at example.com>
Dec 13 04:21:39 localhost postfix/qmgr[8829]: 23A93152F8AD:  
from=<user at example.com>, size=1259, nrcpt=1 (queue active)
Dec 13 04:21:39 localhost cyrus/lmtp[10600]: accepted connection
Dec 13 04:21:39 localhost cyrus/lmtp[10600]: connection from  
localhost.example.com [127.0.0.1] preauth'd as postman
Dec 13 04:21:39 localhost cyrus/master[10652]: about to exec /usr/lib/ 
cyrus/bin/lmtpd
Dec 13 04:21:39 localhost cyrus/lmtp[10652]: executed
Dec 13 04:21:39 localhost cyrus/lmtp[10600]: duplicate_check:  
<7B20542C-21EF-4ECF-96A6-007970F19640 at example.com> example.com! 
user.user.shared 0
Dec 13 04:21:39 localhost cyrus/lmtp[10600]: duplicate_check:  
<7B20542C-21EF-4ECF-96A6-007970F19640 at example.com> example.com! 
user.user 1165979990
Dec 13 04:21:39 localhost cyrus/lmtp[10600]: dupelim: eliminated  
duplicate message to example.com!user.user id  
<7B20542C-21EF-4ECF-96A6-007970F19640 at example.com> (delivery)
Dec 13 04:21:39 localhost cyrus/lmtp[10600]: mystore: starting txn  
2147483771
Dec 13 04:21:39 localhost cyrus/lmtp[10600]: mystore: committing txn  
2147483771
Dec 13 04:21:39 localhost cyrus/lmtp[10600]: duplicate_mark:  
<7B20542C-21EF-4ECF-96A6-007970F19640 at example.com> .user 
+shared at example.com.sieve. 1165980099 0
Dec 13 04:21:39 localhost postfix/lmtp[10651]: 23A93152F8AD: to=<user 
+shared at example.com>, relay=127.0.0.1[127.0.0.1]:24, delay=0.14,  
delays=0.12/0.01/0.01/0, dsn=2.1.5, status=sent (250 2.1.5 Ok)
Dec 13 04:21:39 localhost postfix/qmgr[8829]: 23A93152F8AD: removed
Dec 13 04:21:39 localhost postfix/smtpd[10649]: disconnect from  
localhost.example.com[127.0.0.1]
Dec 13 04:21:39 localhost postfix/lmtp[10647]: 6C35F152F8A9: to=<user 
+shared at example.com>, relay=127.0.0.1[127.0.0.1]:10024, delay=0.84,  
delays=0.03/0.01/0.03/0.77, dsn=2.6.0, status=sent (250 2.6.0 <user 
+shared at example.com> Message accepted for delivery)
Dec 13 04:21:39 localhost postfix/qmgr[8829]: 6C35F152F8A9: removed