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


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