greylisting 4xx patterns

451 Greylisting enabled, try again in 1 minutes                                                                                                                  
451 4.7.1 Greylisting in action, please come back in 00:09:00                                                                                                     
451 4.7.1 Greylisting in action, please come back later                                                                                                   
450 <xxx@xxx.com>: Recipient address rejected: Greylisted for 181 seconds
450 4.7.1 <xxx@xxx.com>: Recipient address rejected: Greylisted for 300 seconds (see http://isg.ee.ethz.ch/tools/postgrey/help/xxxxxx.html)
450 <livejournal.com[204.9.177.18]>: Client host rejected: Policy Rejection- GreyList learning. Please try later.
450 <xxx@xxx.com>: Recipient address rejected: Policy Rejection- Hotkey Greylisting in progress ... Please try again after 2 minutes
451 sender/recip/ip triad greylisted; retry AFTER A DECENT INTERVAL will succeed
450 <xxx@xxx.com>: Recipient address rejected: Greylisting in action. Please try delivery again in 240 seconds.
451 4.3.0 Temporarily greylisted as anti-spam measure.  Please try again.
451 <xxx@xxx.com>: Recipient address rejected: Service is greylisted.  Waiting for retransmit.