Thanks for your reply, but my question Location DB only contain Usename in the format of User(a)mydomain.com, how do I lookup the numerical number that is assigned to user(a)mydomain.com Let say User@mydoamin is assigned 747122 to him, location DB does not contain these alias at all. Please reply with solution? -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.296 / Virus Database: 265.6.6 - Release Date: 28/12/04