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

[Lance A. Brown]

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]

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