[exim] Using ${sg} to remove part of a string

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Author: Stian Jordet
Date:  
To: exim-users
Subject: [exim] Using ${sg} to remove part of a string
Hi,

I'm looking for a way go use $recipients in an acl, without the optional
local part suffix. So, if $recipients = liste+test@??? I only
want liste@???. Is this possible with ${sg}?

Best regards,
Stian