[Exim] server_condition = ${if pwcheck{$1:$3}{1}{0}}

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Author: java
Date:  
To: exim-users
Subject: [Exim] server_condition = ${if pwcheck{$1:$3}{1}{0}}
Can someone, please, tell me what this line does ?
server_condition = ${if pwcheck{$1:$3}{1}{0}}

I have it under fixed_login authenticator, but have no clue of what it is
doing?
Please help.
Thank you.