Little problem with libperditiondb_posix_regex

Hi list, 


While searching the web and perdition-users mailing list archive, I did not found the answer to this case. 

I encounter a little problem with libperditiondb_posix_regex . 

The context is simple : 
Perdition listening to IMAPS connections (from public network), with 3 backend IMAP servers on LAN. 

The configuration is quite simple too ;) : 
(this is running on Debian Wheezy , with Debian provided perdition package : version 1.19~rc5-1+b1) 

/etc/perdition/perdition.imap4s.conf
_____

log_facility local5
timeout 40
imap_capability "IMAP4rev1 UIDPLUS CHILDREN NAMESPACE THREAD=ORDEREDSUBJECT THREAD=REFERENCES IDLE SORT QUOTA ACL ACL2=UNION STARTTLS"
ssl_mode ssl_listen
ssl_cert_file /etc/perdition/mtprx.stux.fr.crt
ssl_key_file /etc/perdition/mtprx.stux.fr.key

# M|map_library FILENAME:
# Library to open that provides functions to look up the server for a
# user.
# M /usr/lib/libperditiondb_gdbm.so.0
#map_library /usr/lib/libperditiondb_gdbm.so.0
map_library /usr/lib/libperditiondb_posix_regex.so.0
# map_library ""

# m|map_library_opt STRING:
# String option for the map_library.
# (default "")
#m ""
map_library_opt "/etc/perdition/transport.re"


bind_address 0.0.0.0,[2a01:xxx:xxx:xxx:xx:xx:feef:6101]
_____


/etc/perdition/transport.re
_____

(.*)@stuxnet.org: mta.stux.fr:143
(.*)@contacts.stux.fr: zimbra.stux.fr:143
(.*)@stux.fr.eu.org: [email protected]:143
____

For the 2 first lines on transport.re, no problem : auth is forwarded without rewriting and works well. 
For the last, I try to extract the first part of e-mail address to forward only this to the "publicmx" host. 

Perdition has been restarted after update of "transport.re" (according to documentation : regex are processed only one, while starting the daemon)

But when auth is made on the backend server, the whole e-mail address is used ... 
(It's useful to say that the dovecot IMAP service works well on this backend).
____

May  1 17:16:41 publicmx dovecot: auth-worker(19430): Error: bsdauth([email protected],172.18.10.61): getpwnam() failed: Operation not permitted
May  1 17:16:43 publicmx dovecot: imap-login: Aborted login (auth failed, 1 attempts in 2 secs): user=<[email protected]>, method=PLAIN, rip=172.18.10.61, lip=172.18.2.25, session=<AxT4Jlj4CwCsEgo9>
____

Did I made a mistake in configuration ? 
My regex seems to match, but is it compliant for this use case ?

Thanks for all your replies ;) . 

Regards,
Christophe.

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