Good point.
However, things change, and this norm should evolve with the involved 
technologies; also, maybe this data quality process, if abusing third-parties 
resources (like RCPT TO: for nothing), is not an acceptable process.
Offline acquisition of online-related data (an email address, for instance) 
definitely is odd by definition. I don't know, just from the top of my head, 
print a QR code printed on the paper so users could register online, from their 

Also, if I'm not mistaking, list-validation services are mainly targeting 
online businesses, so even if the there might be legit cases, I doubt the 
biggest part of their revenues is.


Benjamin Billon

-----Original Message-----
From: mailop [] On Behalf Of Ken O'Driscoll via 
Sent: Wednesday, 7 March, 2018 20:20
Subject: Re: [mailop] Hat color of list washers / validators

On Wed, 2018-03-07 at 11:21 +0000, Benjamin BILLON wrote:
> To me the list-validators are dark grey hats. Their real-time service 
> can be legit. The rest, I don't see how.

There are some industries where offline data acquisition is the norm and 
validation is seen as part of the data quality process.

Insurance claim forms or change of contact details for $LEGACY_PROVIDER spring 
to mind.


Ken O'Driscoll / We Monitor Email
t: +353 1 254 9400 | w:

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