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Information about CBL blacklisted, spamer

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Information about CBL blacklisted, spamer - 20.Jan.2012 6:30:38 AM

vbovbo

Posts: 5
Joined: 11.Jan.2012
Status: offline

Dear friends,

I share my experience with you about concidered Spamer, CBL Blacklisted, ...

We have 1 public adress. Us Mail server is behind a NAT firewall.

One day (8 month after installed and already used us Exchange Server), us public IP adress are concidered as a spamer. CBL blacklist, etc.

I remove manually us public ip.

I search why. Us IP are same. rDNS ok. FQDN ok. I don't understand where is the problem.

2-3 day after, same problem.

I read somes information "Tips : block all outgoing trafic on port 25 exept your Mail server", "sometimes that's happend with a infected host".

YES !!!!!!

I put Firewall rules for authorize only us mail server to us SMTP port(25). And 1 second after i see blocked trafic on this rule.

A computer are infected by a trojan and this is the Spam source.

I clean it. ok.

Now i am looking for having a Fixed public IP for Mail/DNS, ...
and a non fixed IP for all other trafic for the user's.