On 5/5/2010 12:40 PM, Appliantologist wrote:
>> It seems pretty straight forward to me.
>>
>> If you dont have any non-local users sending mail using this server you
>> could just shut down port 25. For those virtual-file id users use port
>> 587 with smtp authentication.Forwarding for those users is not relevant
>> here.
>>     
> I can't shut down port 25, since we accept mail for sites and forward
> it offsite.
> I don't have any users sending mail via our SMTP, they all use gmail
> boxes and their servers.
> I only want to accept mail that is to an address listed in some file
> somewhere, like /etc/postfix/virtual OR is sent by the local host.
>   

This is the default of Postfix.

> I have to figure who ever is doing this crap obviously is targeting
> postfix and probably reads these same lists.
>
> Anyway, thanks for the suggestions, I tried them ...
>   

You still have neglected to share a log of a spam message.
If you include the transaction from beginning to end, people here are
more likely to point you in the right direction.
You may hide usernames to protect your users.

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