Hi Carlos,

Please take a look at the following KB article:

http://service1.symantec.com/SUPPORT/ent-gate.nsf/...

Regards,

Adnan

Hi Carlos,

As per your post you are saying that you tryed telneting your brightmail appliance from outside your corporate network and send a mail.

Solution.....

So it looks like that mail server or brightmail is an open relay. To block this please contact your firewall vendor to configure the same.

Hi Carlos,

You can also take a help of mxtoolbox.com to check your domain for Open relay..

   Hi folks,

   Thanks for all the help already... but just to make this point clear: my server is not an open-relay.

   Outsiders cannot send e-mail trough my server to other domains.

   This problem is just an INTERNAL open-relay, wich means that outsiders can send e-mail pretending to be a third domain to my internal users.

   Anyway, i am still searching, i am working on the page AdnanH informed, i will post results later.

   Thanks to all !
   Carlos Oliveira

You are welcome, Carlos.

I hope that KB article helps to resolve the issue.

Regards,

Adnan