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我使用txamqp Python庫連接到AMQP代理（RabbitMQ的），我有以下的回調消費者：如何刪除或AMQP隊列推遲的消息
@defer.inlineCallbacks
def message_callback(self, message, queue, chan):
"""This callback is a queue listener
it is called whenever a message was consumed from queue
c.f. test_amqp.ConsumeTestCase for use cases
"""
# The callback should be redefined here to keep getting further messages from queue
queue.get().addCallback(self.message_callback, queue, chan).addErrback(self.message_errback)
print " [x] Received a valid message: [%r]" % (message.content.body,)
yield self.smpp.sendDataRequest(SubmitSmPDU)
# ACK the message in queue, this will remove it from the queue
chan.basic_ack(message.delivery_tag)
當「ACK」荷蘭國際集團的消息，它將從隊列中刪除（確認？），但是當消息不是「ACK」版，會發生什麼？我需要得到一個「重試」的機制，我可以推遲到再後來就回呼的消息，並隨時跟蹤多少重試它採取。
而且我怎樣才能列出/從隊列中刪除郵件？