Update integration.md#111
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In the modern full exim milter header configuration example, two $s in `set acl_m_milter_add` and `set acl_m_milter_del` respectively need to be escaped otherwise you get an error with the config: `Failed: $ not followed by letter, digit, or {`.
exim’s string expansion sees $ and tries to interpret it as the start of a variable like $variable or ${...}. When it hits $} it complains because } is not a valid variable-name character.
To fix it, escape the regex end-of-line anchor so exim passes a literal $ through to the PCRE engine
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In the modern full exim milter header configuration example, two $s in
set acl_m_milter_addandset acl_m_milter_delrespectively need to be escaped otherwise you get an error with the config:Failed: $ not followed by letter, digit, or {.exim’s string expansion sees $ and tries to interpret it as the start of a variable like
$variableor${...}. When it hits$}it complains because}is not a valid variable-name character.To fix it, escape the regex end-of-line anchor so exim passes a literal
$through to the PCRE engine.