We got mails (in this case, always spam) with a From: header line of
the strange form
"some name" <user@domain>{SET:debug=11}
Sendmail does not preserve the form of this header but changes it into
"\"some name\" <user@domain>{set:"user@domain
I could not see from sendmail.cf where this happens and could not
reproduce this using /usr/lib/sendmail -bt by any rule. But I could
reproduce the behaviour by sending myself mails with faked From: header
lines of this form.
Is such a From: line meaningful in any way? If yes, what does it mean?
Why is it corrupted by sendmail (version 8.11.7+Sun)?

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Hans Werner Strube strube(@)physik3(.)gwdg(.)de
Drittes Physikalisches Institut, Univ. Goettingen
Friedrich-Hund-Platz 1, 37077 Goettingen, Germany