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* @return boolean 1 - is part of sent_subfolders, 0 - is not part of sent_subfolders
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function sent_subfolders_special_mailbox($mb) {
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$use_sent_subfolders = getPref
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($data_dir, $username, 'use_sent_subfolders', SMPREF_OFF);
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$sent_subfolders_base = getPref($data_dir, $username, 'sent_subfolders_base', 'na');
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if ($use_sent_subfolders == SMPREF_ON &&