202.108.5.0	255.255.255.0	126.com/163.com
220.181.12.0	255.255.252.0	126.com/163.com
202.108.252.129	255.255.255.252	163.net
202.108.255.192	255.255.255.252	163.net
59.36.102.0	255.255.255.0	21cn.com
61.140.60.0	255.255.255.0	21cn.com
202.105.45.0	255.255.255.0	21cn.com
202.123.79.206	-	21cn.com
220.232.167.218	-	21cn.com
221.192.129.19	-	21cn.com
207.171.168.0	255.255.255.0	Amazon.com (common pool)
207.171.180.0	255.255.255.0	Amazon.com (common pool)
207.171.187.0	255.255.255.0	Amazon.com (common pool)
207.171.188.0	255.255.255.0	Amazon.com (common pool)
207.171.190.0	255.255.255.0	Amazon.com (common pool)
204.107.120.10	-	Ameritrade (no retry)
152.163.225.0	255.255.255.0	AOL (common pool)
205.188.139.0	255.255.255.0	AOL (common pool)
205.188.144.0	255.255.255.0	AOL (common pool)
205.188.156.0	255.255.254.0	AOL (common pool)
205.188.159.0	255.255.255.0	AOL (common pool)
64.12.136.0	255.255.254.0	AOL (common pool) - http://postmaster.aol.com/servers/imo.html
64.12.138.0	255.255.255.0	AOL (common pool) - http://postmaster.aol.com/servers/imo.html
217.158.50.178	-	AXKit mailing list (unique sender per attempt)
64.125.132.254	-	collab.net (unique sender per attempt)
66.135.197.0	255.255.255.0	Ebay (common pool)
66.135.209.0	255.255.255.0	Ebay (for time critical alerts)
64.233.160.0	255.255.224.0	Gmail.com pool
66.249.80.0	255.255.240.0	Gmail.com pool
216.239.56.0	255.255.254.0	Gmail.com pool
66.100.210.82	-	Groupwise?
66.162.216.166	-	Groupwise?
65.52.0.0	255.252.0.0	hotmail.com a
131.107.0.0	255.255.0.0	hotmail.com a
157.54.0.0	255.254.0.0	hotmail.com a
157.60.0.0	255.255.0.0	hotmail.com a
167.220.0.0	255.255.0.0	hotmail.com a
199.2.137.0	255.255.255.0	hotmail.com a
204.79.135.0	255.255.255.0	hotmail.com a
204.79.188.0	255.255.255.0	hotmail.com a
204.79.252.0	255.255.255.0	hotmail.com a
207.46.0.0	255.255.0.0	hotmail.com a
209.140.192.0	255.255.224.0	hotmail.com a
64.4.0.0	255.255.192.0	hotmail.com b
65.54.128.0	255.255.128.0	hotmail.com b
199.103.90.0	255.255.254.0	hotmail.com b
204.182.144.0	255.255.255.0	hotmail.com b
204.255.244.0	255.255.254.0	hotmail.com b
206.138.168.0	255.255.248.0	hotmail.com b
207.68.128.0	255.255.192.0	hotmail.com b
207.68.192.0	255.255.248.0	hotmail.com b
207.82.250.0	255.255.254.0	hotmail.com b
207.82.252.0	255.255.254.0	hotmail.com b
209.1.112.0	255.255.254.0	hotmail.com b
204.95.96.0	255.255.240.0	hotmail.com c
209.185.128.0	255.255.254.0	hotmail.com c
209.185.130.0	255.255.254.0	hotmail.com c
209.185.240.0	255.255.252.0	hotmail.com c
216.32.180.0	255.255.252.0	hotmail.com c
216.32.240.0	255.255.252.0	hotmail.com c
216.33.148.0	255.255.252.0	hotmail.com c
216.33.236.0	255.255.252.0	hotmail.com c
216.33.240.0	255.255.252.0	hotmail.com c
216.200.206.0	255.255.255.0	hotmail.com c
64.41.193.0	255.255.255.0	hotmail.com d
65.59.232.0	255.255.254.0	hotmail.com d
65.59.234.0	255.255.255.0	hotmail.com d
209.1.15.0	255.255.255.0	hotmail.com d
216.34.51.0	255.255.255.0	hotmail.com d
194.245.101.88	-	Joker.com (email forwarding server)
12.107.209.244	-	kernel.org mailing lists (high traffic, unique sender per mail)
66.27.51.218	-	ljbtc.com (Groupwise)
64.124.204.39	-	moveon.org (unique sender per attempt)
213.136.52.31	-	Mysql.com (unique sender)
211.29.132.0	255.255.255.0	optusnet.com.au (wierd retry pattern and more than 48hrs)
66.206.22.82	-	PLEXOR
66.206.22.83	-	PLEXOR
66.206.22.84	-	PLEXOR
66.206.22.85	-	PLEXOR
207.115.63.0	255.255.255.0	Prodigy (broken software that retries continually with no delay)
219.133.40.0	255.255.255.0	qq.com
219.133.49.0	255.255.255.0	qq.com
58.60.13.0	255.255.255.0	qq.com
58.60.15.0	255.255.255.0	qq.com
219.133.60.0	255.255.255.0	qq.com
216.33.151.0	255.255.255.0	savvis
205.206.231.0	255.255.255.0	SecurityFocus.com (unique sender per attempt)
64.7.153.18	-	sentex.ca (common pool)
205.211.164.50	-	sentex.ca (common pool)
202.106.182.124	255.255.255.128	sina.com
202.106.187.128	255.255.255.192	sina.com
202.108.3.0	255.255.255.0	sina.com
202.108.35.128	255.255.255.128	sina.com
202.108.43.230	-	sina.com
202.108.182.160	-	sina.com
195.238.2.0	255.255.255.0	skynet.be (wierd retry pattern, common pool)
195.238.3.0	255.255.255.0	skynet.be (wierd retry pattern, common pool)
63.82.37.110	-	SLmail
61.135.128.0	255.255.248.0	sohu.com
61.135.144.0	255.255.254.0	sohu.com
61.135.150.0	255.255.254.0	sohu.com
61.152.234.0	255.255.255.0	sohu.com
203.184.141.0	255.255.255.0	sohu.com
218.206.87.0	255.255.255.128	sohu.com
220.181.26.0	255.255.255.0	sohu.com
221.236.12.128	-	sohu.com
222.28.152.128	255.255.255.128	sohu.com
12.107.209.250	-	sourceware.org mailing lists (high traffic, unique sender per mail)
12.5.136.141	-	Southwest Airlines (unique sender, no retry)
12.5.136.142	-	Southwest Airlines (unique sender, no retry)
12.5.136.143	-	Southwest Airlines (unique sender, no retry)
12.5.136.144	-	Southwest Airlines (unique sender, no retry)
63.169.44.143	-	Southwest Airlines (unique sender, no retry)
63.169.44.144	-	Southwest Airlines (unique sender, no retry)
195.235.39.19	-	Tid InfoMail Exchanger v2.20
61.135.158.0	255.255.255.0	tom.com
202.108.29.0	255.255.255.128	tom.com
202.108.252.129	255.255.255.192	tom.com
202.108.255.192	255.255.255.192	tom.com
203.209.230.0	255.255.255.0	Yachoo CN
68.142.192.0	255.255.192.0	Yahoo
206.190.0.0	206.190.128.0	Yahoo
202.165.96.0	255.255.248.0	Yahoo China
66.94.237.0	255.255.255.0	Yahoo Groups servers (common pool, no retry)
66.218.66.0	255.255.255.0	Yahoo Groups servers (common pool, no retry)
66.218.67.0	255.255.255.0	Yahoo Groups servers (common pool, no retry)
66.218.69.0	255.255.255.0	Yahoo Groups servers (common pool, no retry)