Hi list, I'm currently looking into future e-mail solutions for our university. We would like to use external authentication databases (LDAP in all probability) for user authentication. To me it seems that PAM is the best way to go to get all software to authenticate via any means you might want to, but none of the two solutions that we are testing so far support it. When I asked them why, one of the manufacturers replied that they had so far not included PAM support because all current PAM implementations were buggy in multi-threaded environments and tended to crash when working with large numbers of users. While I strongly doubt this statement, I have to admit I have yet to test PAM in an environment with as many users as our mailserver will have (~25,000 users). I am wondering if anybody on this list is using PAM on their SuSE boxes (or any other *NIX environment) for authentication (mail/ftp/whatever) with this number of users, or has had any negative experiences with this number of users and PAM. TIA Stefan