Re: block spam mail from lan
- On 5/11/2013 7:34 AM, Pol Hallen wrote:
>> And the most effective countermeasure to spam originating from devicesIt would probably be best at this point for you to describe your
>> on the LAN has nothing to do with Postfix. As most spamware in the wild
>> today still attempts to send direct-to-MX, simply creating a TCP 25
>> egress filter at your edge router/firewall will give the best bang for
>> the buck. This simply means creating a rule to drop all outbound TCP 25
>> connections except those originating from the IP of your Postfix MTA.
> I don't understand.
> Situation: A real user using browser connect to squirrelmail and send a
> mail. It's ok.
> But if this user create a mail bomb using squirrelmail how way to spam I
> can have this problem.
> If a drop port 25, user can send any mail.
> Or tell me what I don't understand.
network, your mail usage scenario, so we can give you targeted
responses. I.e. is this a
1. typical office environment mail server
2. SOHO or personal server
3. university mail server
4. ISP mail server