how to avoid spam mail from external network

[Paul Howarth]

On Thu, 2006-07-06 at 11:15 +0530, yogesh at banasdairy.coop wrote:
> hi frieds
> i have mail server on linux
> my mail server generate spam mail
> how to avoid this spamming
> 
> the spam mail will come from external globval network
> i thaught that my server any port is opren
> how to secure my mail server

You will need to tell people:

* which mail server software you are running
* which configuration options you have changed from the defaults
* what the spam looks like (with full headers)

Paul.