someone is using my email address to spam, is there a way to stop this ?

[Dave Cramer]

On 11-Aug-08, at 11:20 AM, James Knott wrote:

> Dave Cramer wrote:
> mmm...  I just did a test and inbound port 25 is not blocked on  
> Rogers.
>>>
>>> I just did some testing at work and found Sympatico blocks  
>>> incoming port 25.  Because of this, I cannot test from Rogers to  
>>> see if they block outgoing port 25.  Sympatico also blocks  
>>> outgoing port 25.  I verified this by running nmap against my home  
>>> network and also with the port scan at www.grc.com.  Nmap (on  
>>> Sympatico) can't see port 25, but is can see ssh, though  
>>> www.grc.com can see both.  The only question remaining is does  
>>> Rogers block outgoing port 25.  I don't have the means to test that.
>>>
>> Rogers blocks port 25 to any other smtp server but theirs. In other  
>> words if you want to use your own smtp server you won't get a  
>> connection. I typically just redirect another port on my server to  
>> port 25 using iptables.
>
> Is that actually Rogers blocking that?  Or the other network  
> blocking inbound port 25.  As I mentioned above, they don't block  
> inbound, but Sympatico blocks both directions.

Well the rationale is that a hacked machine will attempt to send email  
directly to the users final smtp server. So blocking any other  
destinations effectively cuts down on spam generation.
It makes sense for the masses, just not the select few who actually  
know what they are doing.

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