Spam in local domains

[LeandroV]

Hello. I have a problem with smtp auth. I have a huge queue email. I have been investingating and my conclusion is that I have an open relay for local domains. I mean, if I make a smtp auth I can send emails to everywhere, but if a don't make that smtp auth I can't send emails outside my server but I can send them to the domains that are in my server. Nowadays all spammers are trying to send emails to all my accounts. I receive about 20000 emails from them... I need help! how can I force to make a smtp auth for local domains?

Regards

 

[JONEBARKER]

Did you ever get help on this?