Christopher Bort wrote:
> In all of the relay attempts I'm seeing on this mail server, the
> recipient addresses are in domains for which the server is an NS.

They are looking for any connection possible.  A nameserver is an
association.  They will hope that perhaps it allows mail.  Unlikely to
the extreme but not inconceivable.

> I think, that they do care that it's an NS. It seems like they're
> looking for hosts that will deliver|relay messages for specific
> domains, so why don't they just use the existing MX rather than
> trying an NS host with which there's no reasonable expectation that
> it will relay for the target domain?

You are trying to apply logic to a situation to which no reason can be
applied.  Spammers do not operate with a sanity of reason and logic.
There is intelligence.  But bludgeoning others for their own gain only
makes sense to them and not to members of society.

> I suppose they could be looking for back doors, but that seems like
> it would be a very low probability undertaking.

Spammers base their existence upon extremely low probabilities
multiplied by very large numbers of messages.

Bob

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