qmail队列里堆积信件，无法发送出去，急！

yaya76

qmail进程都正常，可以给本地的用户发信，但是给外面发信，信件都堆积在队列里，无法发送出去。
看到LOG里记录了很多都是给aol.com这里的地址发信，于是删除了内容里含有aol.com的信件，现在的LOG很乱，好象有很多问题，请大家帮我看看，是哪里的问题，谢谢！
LOG里的部分内容：
Sep 13 23:18:41 ns1 qmail: 1095088721.004957 new msg 3222129
Sep 13 23:18:41 ns1 qmail: 1095088721.005057 info msg 3222129: bytes 1578 from <>; qp 26312 uid 506
Sep 13 23:18:41 ns1 qmail: 1095088721.015145 starting delivery 6750: msg 3230695 to remote kink_71@yahoo.com
Sep 13 23:18:41 ns1 qmail: 1095088721.015226 status: local 0/50 remote 20/20
Sep 13 23:18:43 ns1 qmail: 1095088723.010988 warning: trouble injecting bounce message, will try later
Sep 13 23:18:43 ns1 qmail: 1095088723.013606 warning: trouble injecting bounce message, will try later
Sep 13 23:18:43 ns1 qmail: 1095088723.015971 warning: trouble injecting bounce message, will try later
Sep 13 23:18:45 ns1 qmail: 1095088725.553712 delivery 6750: deferral: 64.156.215.18_failed_after_I_sent_the_message./Remote_host_said:_421_mta320.mail.scd.yahoo.com_Resources_temporarily_unavailable._Please_try_again_later_[#4.16.3]./
Sep 13 23:18:45 ns1 qmail: 1095088725.553763 status: local 0/50 remote 19/20
Sep 13 23:18:45 ns1 qmail: 1095088725.568283 starting delivery 6751: msg 3226463 to remote bsonn24174@aol.com
Sep 13 23:18:45 ns1 qmail: 1095088725.568316 status: local 0/50 remote 20/20
Sep 13 23:18:45 ns1 qmail: 1095088725.568518 delivery 6751: deferral: qmail-spawn_unable_to_open_message._(#4.3.0)/
Sep 13 23:18:45 ns1 qmail: 1095088725.568535 status: local 0/50 remote 19/20
Sep 13 23:18:45 ns1 qmail: 1095088725.576292 starting delivery 6752: msg 3230697 to remote kinka@zipmail.com.br
Sep 13 23:18:45 ns1 qmail: 1095088725.576313 status: local 0/50 remote 20/20
Sep 13 23:18:47 ns1 qmail: 1095088727.578658 warning: trouble injecting bounce message, will try later
Sep 13 23:18:47 ns1 qmail: 1095088727.581197 warning: trouble injecting bounce message, will try later