On Fri, Dec 11, 2015 at 09:57:05AM +0000, Paul Smith wrote:
On whether IP addresses are useful in Received headers...
I don't think anyone has said that IP addresses in general can't be
useful in Received headers. Nor has anyone suggested to remove the
addresses of public facing mail servers from the headers.
Actually, draft-josefsson-email-received-privacy-01 suggests just that. It
says:
There may be other situations where adding Received headers would
leak unintended information to an observing party. For example, an
organization may use different SMTP relays depending on the category
of a customer. By knowing the mapping between SMTP relay and
customer category, an observing party would learn the customer
category for the organization.
It then goes on to say that IP address information MUST NOT be added
by "SMTP entities concerned with the privacy of their clients".
Ned
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