If the domain or subdomain involved has enduser (at all) accounts then
it is likely a poor candidate for ADSP "DISCARDABLE". ADSP "DISCARDABLE"
should be used for domains that are subject to high levels of abuse and
are used primarily for transactional or marketing email and where the
mail flows are strictly controlled.
I entirely agree. (So there!)
The question remains how to reliably identify such domains.
R's,
John
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