[exim] server_condition syntax help?

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Lähettäjä: Joe Kocsis
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Vastaanottaja: exim-users
Aihe: [exim] server_condition syntax help?
Can someone help me understad the syntax of the server_condition?

server_condition = ${if eq{$1}{${lookup mysql{SELECT Account FROM
UserSession WHERE Account='$1' and Password='$2'}{$value}fail}}{1}{0}}

I've been searching for hours and can't find an explanation..

Thanks..

Joe