Request: Please sign this list's messages via DKIM or SPF

lst_hoe02 at lst_hoe02 at
Tue Apr 5 03:42:21 EDT 2016

Zitat von Binarus via Info-cyrus <info-cyrus at>:

> Combine SPF / DKIM with domain blacklisting, and then you *have* an  
> efficient spam fighting tool.

As stated the spam actually reaching our inboxes after around 90%  
cutoff is valid DKIM/SPF signed as it is mostly from the big free  
providers like, Google and Yahoo. Some other big share is  
from professional spam farms with always alternating IP and Domains  
ranges from all over the world with also valid DKIM/SPF. Next big  
share is from educational servers also mostly valid DKIM/SPF. The tiny  
rest with around 10% is in fact not DKIM/SPF signed.
 From the valid e-mail around 20% looks like having a valid SPF/DKIM,  
mostly professional newsletters not personal mail from customers.

So No, SPF/DKIM is no useful spam fighting tool at least not in our  
corner of the world.



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