On 2023-01-17, Marco Moock <
mo...@posteo.de> wrote:
> Was hat es mit den zwei aufeinanderfolgenden Ausrufezeichen auf sich?
lmgtfy
https://www.rfc-editor.org/rfc/rfc5536#section-3.1.5
The use of the <diag-match>, which appears as "!!", indicates that the
agent to its left verified the identity of the agent to its right before
accepting the article (whereas the <path-delimiter> "!" implies no such
claim).