Your method is solid, your logic is flawed. You need to send the info too if $received_about{$nick} isn't set. I think this will work: 
if (!$received_about{$nick} or (time - $received_about{$nick}) > 60) {
    $received_about{$nick} = time;
    &snd_msg("About");
}

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In reply to Re^2: Preventing IRC flood by bart
in thread Preventing IRC flood by D-0

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