At 11:05 AM 02/01/01, you wrote:
>Thanks  !
>But let me ask again... :-)
>I'm not providing access to my customer only some hosting service, so I
>can't filter IP address.
>The only way to close relay to the world is to force SMTP AUTH ?
>If yes, exist some mailer that not support this feature ?

Yes, there are some email programs that do not support SMTP AUTH.  You need 
to discourage your users from using such software.
Most of the popular ones do support SMTP AUTH. Outlook, Eudora, etc.



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