I have no idea about this bl but - quite a few data points you might use in 
your decision making process.

Did they reach out first to your postmaster mailbox and did they then get a 
reply?  If not then how long did they not get a reply before they did this?

Did they hit trap(s) on your server or was the block due to this swinog or some 
other bl?

What does their traffic to you normally look like wrt bounce rates, delivery to 
trap addresses, spam complaints etc?

--srs

> On 30-May-2016, at 8:02 PM, Benoit Panizzon <[email protected]> wrote:
> 
> As an ISP we operate email services under various domain names for our
> end-customers.
> 
> We also operate the community based SWINOG DNS Anti-Spam Blacklist
> services.

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