On Tue, 14 Oct 2008, Michael Deutschmann wrote:
C/R in the 550 message, as you propose, avoids the backscatter problem
but not the antibiotic problem. It also has the issue that some senders
may not ever see the 550 text.
I have extensive experience putting text in the 4xx and 5xx responses. Almost
all users do see the text - only once was there a mail system so braindead
as to remove it. The problem is, almost nobody reads it. They see something
about "failed delivery", and their eyes glaze over and they never actually read
the details, and then they delete it before calling support so that there is no
evidence left of what really happened other than "my mail isn't getting
through".
I also log the 4xx and 5xx responses, of course, so if I can only extract
an approximate time or email address, I can find it.
Occassionally, maybe a dozen times in last few years out of millions of
messages, someone with half a brain will read the text, act on the
advice, and thank me via email to postmaster for the information.
--
Stuart D. Gathman <stuart(_at_)bmsi(_dot_)com>
Business Management Systems Inc. Phone: 703 591-0911 Fax: 703 591-6154
"Confutatis maledictis, flammis acribus addictis" - background song for
a Microsoft sponsored "Where do you want to go from here?" commercial.
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