[PERDITION-USERS] authentication failure using username@domain

Hello everybody, after three days messing around with the set up, reading manuals, looking for similar problems in the internet and trying possible solutions, I come here, hopping that somebody has had the same problem or can point me to the right direction. We have an email set up, that uses perdition as the proxy server to our pop3 mailboxes hosted in a big network drive. The authentication is trough ldap. The production servers works ok. We have build few more servers cloning the same configuration. The problem is that if we try to log with just username, it works fine, but if we try to log as username(a)foo.bar we get an authentication failure. The delimiter parameter is set up in perdition.conf (as said is a clone configuration from production server), /etc/authlib/authldaprc is the same in both set ups. We are using same ldap server. The perdition versions are different (1.15-1 production vs 1.17-1 new servers) but haven't found anything relevant to this problem, reading the docs. perdition[17682]: Auth: 127.0.0.1->127.0.0.1 user="blablabla(a)bloblo.com" server="127.0.0.1" port="1110" status="failed: Re-Authentication Failure" perdition[17762]: Fatal Error reading authentication information from client "127.0.0.1->127.0.0.1 ": Exiting child Thank you in advance. Antonio. This email has been scanned for all viruses by the MessageLabs SkyScan service. Please consider the environment before printing this email. The content of this email and any attachment is private and may be privileged. If you are not the intended recipient, any use, disclosure, copying or forwarding of this email and/or its attachments is unauthorised. If you have received this email in error please notify the sender by email and delete this message and any attachments immediately. Nothing in this email shall bind the Company or any of its subsidiaries or businesses in any contract or obligation, unless we have specifically agreed to be bound. KCOM Group PLC is a public limited company incorporated in England and Wales, company number 02150618 and whose registered office is at 37 Carr Lane, Hull, HU1 3RE. 118288 - KCOM UK Directory Enquiries. Calls cost 49p connection + 14p per minute including VAT from a KC or BT landline. Call charges from mobiles and other networks may vary. If you are calling from a mobile you will now receive your requested number via text message. You will not be charged for the text message.