You can use the following as a guide to get it working with exim and baruwa2 (https://github.com/Exim/exim/wiki/SimpleGreylisting) or it can be implemented via postfix in baruwa 1.
Hey Guys, I m curious to know since greylisting can be extremely effective against SPAM, does baruwa 2 offer greylisting plugin or may be 1.x branch.
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