Please explain what this code does

[Andrey Demenev]

This is code from Mail::DeliveryStatus::BounceParser
@error_lines = (grep { /\S/ }
                grep { ! /error detail/i }
                grep { /message.*not delivered to the following/i .. 

                       /error detail/i } split /\n/, $error_part);
Could someone please explain what thi code does? I am absolutely new to 
perl, and these several greps confuse me :(

Thank you
--
Andrey Demenev
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