First of all: smtp auth is _the_ answer indeed :)

But if it gets to a new feature, I think this is how it could work:

The actual check would be: check all fqdn-s in the dyndns_whitelist and 
get their IP. If any of them matches the source IP, it gets whitelisted.

The problem is that this would be very resource consuming. Spamdyke 
already does a nice amount of DNS requests and even with a few items on 
this list, this can double, triple, etc. the number of requests. The 
only way that this could work would be a centralized solution similar to 
the recipient system due to come in 5.0.0. At least this is my 2c :)

Regards
Bgs

Sam Clippinger wrote:
> SMTP AUTH is definitely the best option, if you can configure postfix to 
> perform it for outbound email.
> 
> I don't use DynDNS myself -- what would be required to support it?  
> Would spamdyke need to find the IP address(es) of a (list of) DynDNS 
> name(s), then add those IP address(es) to the whitelist?  If that's all 
> it would take, I don't think that would be very hard.
> 
> -- Sam Clippinger
> 
> Christian Aust wrote:
>> Hi all,
>>
>> I'm using the latest release of spamdyke, and it's working great -  
>> thanks a lot.
>>
>> Now I'd like to have my home server relay it's mail through the main  
>> mail system. Spamdyke blocks the connecton with DENIED_IP_IN_CC_RDNS,  
>> because the home system certainly connects using a non-static IP which  
>> happens to have the ip in it's RDNS name. spamdyke is working  
>> perfectly and is doing what it has been told.
>>
>> But how could I allow my satellite server to actually send mail  
>> through this relay? If I could instruct spamdyke to check the IP  
>> against some given dyndns name (and allow if the IPs match) it would  
>> be all right, but AFAIK spamdyke doesn't offer such option. Or, does it?
>>
>> Any other ideas? BTW: I'm running postfix on the satellite and  
>> (obviously) qmail on the main server. Best regards,
>>
>> Christian
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>> spamdyke-users@spamdyke.org
>> http://www.spamdyke.org/mailman/listinfo/spamdyke-users
>>   
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