Just to let you know. I've found out that the cause of the weird behavior was a bad addition of a new mailing list (the new system manager duplicated the aliases of my mailing list and then tried to change them). I have no clue why the result was as it was, but once we deleted the changes he has made and rebooted the server, it was solved. Thanks for your help, Hagai >>>>>>>>>>>>>>>>>> ================================ <<<<<<<<<<<<<<<<< Hagai Agmon-Snir Tel: (02) 533-7980 Surface mail: Intl.: 972-2-533-7980 P.O.Box 84917 Mevaseret-Jerusalem 90805 Israel E-mail: [log in to unmask] WWW: http://mrb.niddk.nih.gov/hagai/ <<<<<<<<<<<<<<<<< ================================ >>>>>>>>>>>>>>>>>>