Hi Paul,
At 11:33 07-12-2012, Paul Smith wrote:
Do people really send messages with a return path of
'noreply@example'? Or, do you mean that people use a return path of
'noreply@<their own domain>'?
I used "example" as an example. I misunderstood what you meant by
reply. I was referring to what's used as the author address.
I don't recall whether noreply@example is used in the envelope for
delivery failures (assuming valid messages). There are valid
messages with an invalid Return-Path. This may due to some
assumptions about how email works.
With the former, I'd expect a large number of those messages to be
blocked/discarded (it's common to do call back verification, or just
simply check that the sender domain
Call-back verification can be used to trigger a Denial of Service.
Regards,
-sm
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