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

[James Knott]

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.  It would be nice to set up a system 
that does not block inbound and verify with www.grc.com that it's 
visable and then try running nmap from on the Rogers network.  I'm not 
aware of any unblocked port 25 to test with, but if someone has an 
unblocked SMTP server running on another ISP, I'd be happy to try nmap 
against it.  It doesn't even have to be an SMTP server.  Just an open 
port 25 in your firewall.  Both www.grc.com and nmap will show a closed, 
rather than blocked port in that instance.

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