In article <C1A5FAAA942E0F363CA177C0@PSB> you write:
(1) Are DSNs implemented broadly enough that it is reasonable to
claim that the spec is good enough to allow interoperability?
(2) Have they been deployed sufficiently to demonstrate that
they are perceived of as useful by at least some of the people
some of the time. ...
It seems quite clear that the parts of RFC 3461 that describe a DSN to
be sent back on non-delivery are widely implemented. The SMTP
extensions aren't, but this is hardly the only RFC where people
implement some parts and not others.
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