Olivier Sannier wrote:
> I would like to confirm a few things:
>
> 1. AFAIK, it won't be an open relay for anyone but only for 
> authenticated STMP users. This behaviour is the default one and nothing 
> needs to be configured.
>   

Yep.

> 2. I can use something like SpamHaus to filter by IPs, I've seen the 
> option in the webadmin interface so I should be able to turn that on if 
> needed
>   

Yep.

> 3. I've heard about greylisting where the default answer is to say "come 
> back later". Initial testing suggests that courier is handling that well 
> when connecting to a remote server. However, can it be configured to 
> behave like this when receiving SMTP connections?
>   

You can get third-party software to do that.  Once such solution is 
pythonfilter, which I wrote:
http://phantom.dragonsdawn.net/~gordon/courier-pythonfilter/

> 4. I've seen servers that refuse mails from mine saying that the domain 
> is not routeable. I've looked around and it seems that's because they 
> try to contact the MX server for my domain as a way to verify the 
> originating server and address exist. As my server is not "live" on the 
> Internet, that does not work yet. Can this kind of behaviour be 
> configured in Courier? And is it desirable?
>   

You can get that, also, from third-party software, such as pythonfilter.


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