Hi, Davide: I had post a mail about my question about RDNS, now I get more knowlege about it.
Mine is windows platform. I have know now that you using 'gethostbyaddr' to execute RDNS,which maybe return NETBIOS name, I think that is not we hope. Microsoft recommend using "getnameinfo". But even for "getnameinfo",Microsoft said: " The capability to perform reverse lookups using the getnameinfo function is convenient, but such lookups are considered inherently unreliable, and should be used only as a hint. " Then how about RDNS? I using it to anti spam. Best regards, Jhon Wong - To unsubscribe from this list: send the line "unsubscribe xmail" in the body of a message to [EMAIL PROTECTED] For general help: send the line "help" in the body of a message to [EMAIL PROTECTED]