[TriLUG] Re: Postfix, Relay and nc.rr.com

[Brian Blater (BBList)]

>>> On Wed, Sep 20, 2006 at 12:20 PM, in message
<45116A5F.8020801 at bearcircle.net>,
lance at bearcircle.net wrote: 
> jason at monsterjam.org wrote:
>> well, dunno if this is your problem, but this is something that I
ran into 
>> and you need to be aware of as well if youre doing this..
>> 
>> if your server/domain have been up for a while, youll start to
notice 
>> emails coming to people that dont even exist on your domain.
>> i.e.  fred at yourdomain.com, fred2 at yourdomain.com,
frank at yourdomain.com, 
>> filly at yourdomain.com, etc..
>> 
>> Its the winblows spambots spewing their crap trying to guess names
on your 
>> domain. Well, your smtp server will probably respond (like it
usually 
>> should) saying 
>> "user xxxx not valid" back to whoever sent it, which goes through to

>> roadrunners server. now after a while, roadrunner will see a
buttload of 
>> emails coming from your device being relayed through their server,
and 
>> they will think,  "hey YOU are spamming people!", even though all
you are 
>> doing is replying to all those emails with the no such user reply.
> 
> You are doing something wrong if your SMTP server is accepting these
> messages and *then* sending back the 'user xxxx not valid' error
> messages.  That check should be happening at the 'RCPT TO:' phase of
the
> SMTP transaction and not after the message is accepted and sitting
in
> your mail queue.
> 
> -- [Lance]

Which is what my server does. All "invalid user" errors are handled
during the smtp connection process and never delivered to an account. I
don't think the problem is caused by this.

Brian