Report Description

This report is a comprehensive report involving all mail servers we know of visible on the internet. For each domain in our conventional web server survey, we also determine the list of mail servers that provide inbound mail services (via MX record lookups). Each unique mail server is connected to once each month, where we wait for the server's "220 " message which usually accompanies a banner revealing the server software being used.

Basic Response Statistics

When connecting to an MX server, a number of different responses are possible. The remote server may not be up and running or completely refusing connections, it may not respond back with a "220 " line in the amount of time we wait, nor will it always provide a banner that identifies the type of software running.

Description>	Number of Servers	Percent
Total Number of MX Servers Queried	1,934,409	100.0%
Number of Servers that didn't respond	325,773	16.84%
Server didn't open socket	313,313	16.20%
Server didn't provide banner	12,460	0.64%
Server provided banner	1,608,636	83.16%
Server banner identifies software in use	927,878	47.97%

As indicated by the above table, of the 1,934,409 servers queried, only 927,878 servers responded with a banner that allow us to identify the software being used. All of the remaining information in this report is based on the responses that allowed us to identify the software in use.

Basic Technology Breakdown

Server Type	Number of Servers	Percent
Exim	231,005	24.90%
Sendmail	217,626	23.45%
Microsoft	202,366	21.81%
Postfix	161,249	17.38%
MailEnable	25,949	2.80%
MDaemon	23,183	2.50%
IMail	20,789	2.24%
Lotus Domino	6,320	0.68%
Kerio	6,214	0.67%
WinWebMail	5,112	0.55%
Merak	4,857	0.52%
CommuniGate Pro	4,629	0.50%
XMail	2,673	0.29%
GroupWise	2,521	0.27%
Trend Micro	2,374	0.26%
ArGoSoft	2,252	0.24%
Qmail Toaster	1,773	0.19%
SurgeSMTP	1,649	0.18%
Gordano Messaging Suite (GMS)	901	0.10%
Post.Office	795	0.09%
Mirapoint	566	0.06%
InterScan VirusWall	546	0.06%
VisNetic	483	0.05%
NetIQ MailMarshal	466	0.05%
MagicMail	420	0.05%
Interscan	361	0.04%
WebSTAR V	172	0.02%
Neon Mail Server	167	0.02%
Mercury	153	0.02%
ModusMail	93	0.01%
MessageWall	69	0.01%
WebSTAR	65	0.01%
MAILsweeper	53	0.01%
OpenVMS	27	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (231,005 servers)
Version	Number of Servers	Percent
4.69	156,151	67.60%
4.63	23,927	10.36%
4.68	16,908	7.32%
4.67	8,764	3.79%
4.66	4,845	2.10%
4.60	4,799	2.08%
4.50	4,233	1.83%
4.62	4,232	1.83%
Other	7,146	3.09%
Sendmail (217,626 servers)
Version	Number of Servers	Percent
8.13.1	36,094	16.59%
8.12.11.20060614	24,461	11.24%
8.13.6	21,055	9.67%
8.12.11.20060308	19,501	8.96%
8.13.8	19,190	8.82%
8.11.6	14,578	6.70%
8.12.10	11,164	5.13%
8.13.6.20060614	11,164	5.13%
8.12.11	10,444	4.80%
8.14.1	8,932	4.10%
8.14.2	6,352	2.92%
8.13.4	5,841	2.68%
8.13.7	4,931	2.27%
8.14.3	4,875	2.24%
8.12.8	4,710	2.16%
8.9.3	2,778	1.28%
8.10.2	2,387	1.10%
Other	9,169	4.21%
Microsoft (202,366 servers)
Version	Number of Servers	Percent
6.0.3790.3959	149,703	73.98%
6.0.3790.1830	31,245	15.44%
5.0.2195.6713	13,893	6.87%
6.0.3790.211	4,091	2.02%
Other	3,434	1.70%
Postfix (161,249 servers)
Version	Number of Servers	Percent
Other	161,249	100.00%
MailEnable (25,949 servers)
Version	Number of Servers	Percent
1.981--	5,613	21.63%
1.983--	3,333	12.84%
1.986--	2,964	11.42%
1.96--	1,343	5.18%
1.95--	1,241	4.78%
1.9--	1,009	3.89%
1.8--	782	3.01%
0-3.14-	753	2.90%
0-2.37-	671	2.59%
0-1.85-	560	2.16%
0-3.53-	552	2.13%
0--3.53	458	1.77%
0-2.52-	448	1.73%
0--3.14	340	1.31%
0-2.38-	327	1.26%
0-1.87-	301	1.16%
0-3.52-	292	1.13%
0-2.36-	292	1.13%
0-3.04-	288	1.11%
Other	4,382	16.89%
MDaemon (23,183 servers)
Version	Number of Servers	Percent
10.0.0	3,804	16.41%
9.6.6	2,461	10.62%
9.6.5	1,699	7.33%
9.6.1	1,461	6.30%
9.6.4	1,095	4.72%
9.6.2	911	3.93%
8.1.3	845	3.64%
9.5.6	812	3.50%
9.5.2	807	3.48%
9.0.4	741	3.20%
10.0.1	696	3.00%
9.5.1	659	2.84%
9.6.3	591	2.55%
7.2.3	479	2.07%
6.8.5	454	1.96%
7.2.0	397	1.71%
9.0.1	370	1.60%
9.5.5	327	1.41%
9.0.0	315	1.36%
8.0.2	289	1.25%
8.1.4	282	1.22%
8.1.1	244	1.05%
9.5.4	242	1.04%
9.6.0	235	1.01%
Other	2,967	12.80%
IMail (20,789 servers)
Version	Number of Servers	Percent
8.22	4,405	21.19%
8.15	2,892	13.91%
9.23	1,800	8.66%
10.01	1,737	8.36%
8.05	1,245	5.99%
9.10	1,179	5.67%
7.07	802	3.86%
9.21	716	3.44%
7.15	709	3.41%
10.0	694	3.34%
6.06	518	2.49%
9.22	425	2.04%
8.00	416	2.00%
9.20	363	1.75%
8.21	350	1.68%
8.04	329	1.58%
8.01	252	1.21%
8.10	246	1.18%
8.20	212	1.02%
Other	1,499	7.21%
Lotus Domino (6,320 servers)
Version	Number of Servers	Percent
7.0.2	688	10.89%
8.0.1	625	9.89%
7.0.3	391	6.19%
6.5.4	352	5.57%
7.0.1	341	5.40%
7.0.2FP2	303	4.79%
6.5.1	302	4.78%
8.0.2	296	4.68%
6.5.3	274	4.34%
7.0	235	3.72%
8.0	224	3.54%
6.5.5	223	3.53%
6.5	193	3.05%
7.0.3FP1	179	2.83%
7.0.2FP1	139	2.20%
5.0.11	115	1.82%
6.5.2	111	1.76%
5.0.12	76	1.20%
7.0.2FP3	75	1.19%
6.5.6	75	1.19%
5.0.13a	65	1.03%
Other	1,038	16.42%
Kerio (6,214 servers)
Version	Number of Servers	Percent
6.5.2	2,021	32.52%
6.5.0	749	12.05%
6.5.1	695	11.18%
6.4.1	523	8.42%
6.3.1	456	7.34%
6.4.2	323	5.20%
6.4.0	321	5.17%
6.3.0	183	2.94%
6.6.0	96	1.54%
6.1.0	72	1.16%
6.1.3	71	1.14%
6.2.2	69	1.11%
6.2.0	66	1.06%
Other	569	9.16%
WinWebMail (5,112 servers)
Version	Number of Servers	Percent
3.7.6.1	1,349	26.39%
3.7.3.1	1,231	24.08%
3.7.1.1	707	13.83%
3.7.5.1	404	7.90%
3.6.3.1	371	7.26%
3.7.0.5	301	5.89%
3.7.7.1	230	4.50%
3.7.0.7	201	3.93%
3.7.0.3	179	3.50%
3.7.7.3	87	1.70%
Other	52	1.02%
Merak (4,857 servers)
Version	Number of Servers	Percent
8.0.3	1,874	38.58%
8.9.1	495	10.19%
8.5.0	306	6.30%
7.4.5	249	5.13%
7.6.4	230	4.74%
7.5.2	217	4.47%
8.3.8	209	4.30%
7.4.2	110	2.26%
9.0.0	98	2.02%
7.2.0	76	1.56%
7.6.1	73	1.50%
6.2.1	71	1.46%
8.2.4	68	1.40%
8.2.13	53	1.09%
8.9.0	49	1.01%
Other	679	13.98%
CommuniGate Pro (4,629 servers)
Version	Number of Servers	Percent
4.1.8	380	8.21%
5.2.8	308	6.65%
5.1.13	253	5.47%
4.2.10	252	5.44%
5.1.12	192	4.15%
5.1.16	174	3.76%
5.2.6	156	3.37%
5.2.3	153	3.31%
5.1.14	146	3.15%
5.2.5	128	2.77%
5.0.13	126	2.72%
5.2.0	123	2.66%
5.0.9	113	2.44%
5.1.10	98	2.12%
5.0.14	91	1.97%
5.1.8	90	1.94%
5.1.9	86	1.86%
5.1.7	82	1.77%
5.2.7	76	1.64%
5.1.11	66	1.43%
5.2.1	66	1.43%
4.2.8	62	1.34%
4.2	60	1.30%
4.3.12	57	1.23%
4.2.9	57	1.23%
4.2.7	56	1.21%
5.0.8	55	1.19%
5.0.11	52	1.12%
5.1.5	48	1.04%
Other	1,023	22.10%
XMail (2,673 servers)
Version	Number of Servers	Percent
1.22	799	29.89%
1.25	581	21.74%
1.24	515	19.27%
1.21	246	9.20%
1.17	121	4.53%
1.20	116	4.34%
1.23	107	4.00%
1.12	62	2.32%
1.16	35	1.31%
Other	91	3.40%
GroupWise (2,521 servers)
Version	Number of Servers	Percent
7.0.3	713	28.28%
7.0.2	524	20.79%
6.5.7	289	11.46%
7.0.1	231	9.16%
6.5.4	164	6.51%
6.5.6	117	4.64%
6.0.4	99	3.93%
7.0	70	2.78%
6.5.5	67	2.66%
6.5.1	67	2.66%
6.5.2	29	1.15%
6.5.3	26	1.03%
Other	125	4.96%
Trend Micro (2,374 servers)
Version	Number of Servers	Percent
5.7	1,125	47.39%
5.5	769	32.39%
5.18	342	14.41%
7.0	95	4.00%
Other	43	1.81%
ArGoSoft (2,252 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.5)	487	21.63%
1.8 (1.8.9.3)	365	16.21%
1.8 (1.8.9.1)	278	12.34%
1.8 (1.8.8.7)	181	8.04%
1.8 (1.8.8.8)	175	7.77%
1.8 (1.8.9.2)	124	5.51%
1.8 (1.8.9.4)	61	2.71%
1.8 (1.8.8.9)	61	2.71%
1.8 (1.8.8.1)	46	2.04%
1.8 (1.8.9.0)	38	1.69%
1.8 (1.8.6.0)	37	1.64%
1.8 (1.8.8.2)	32	1.42%
1.8 (1.8.5.9)	28	1.24%
Other	339	15.05%
Qmail Toaster (1,773 servers)
Version	Number of Servers	Percent
1.3	1,434	80.88%
1.2	264	14.89%
1.0	55	3.10%
1.5	18	1.02%
Other	2	0.11%
SurgeSMTP (1,649 servers)
Version	Number of Servers	Percent
3.9e-1	499	30.26%
3.8k4-4	182	11.04%
3.9c-1	177	10.73%
3.9g2-2	165	10.01%
3.8f3-3	80	4.85%
3.7b8-8	67	4.06%
3.8i3-3	58	3.52%
3.6f5-5	50	3.03%
3.5b3-3	49	2.97%
3.8f2-2	35	2.12%
3.0c2-2	29	1.76%
3.8k2-2	19	1.15%
Other	239	14.49%
Gordano Messaging Suite (GMS) (901 servers)
Version	Number of Servers	Percent
Other	901	100.00%
Post.Office (795 servers)
Version	Number of Servers	Percent
3.5.3	193	24.28%
4.0.1	73	9.18%
3.5.3J	54	6.79%
4.1.0.2	48	6.04%
3.8.3	42	5.28%
3.6.3	31	3.90%
3.9.2.3	27	3.40%
3.1.2J	27	3.40%
3.9.1	26	3.27%
3.6.2	26	3.27%
3.9.0	22	2.77%
3.9.2	22	2.77%
3.8.7.4	21	2.64%
3.1.2	19	2.39%
3.8.4	17	2.14%
4.1	14	1.76%
3.9.1.3	13	1.64%
3.5.2	13	1.64%
3.9.2.1	11	1.38%
4.0.0.1	10	1.26%
3.8.2	9	1.13%
4.0.0.2	9	1.13%
Other	68	8.55%
Mirapoint (566 servers)
Version	Number of Servers	Percent
3.8.4-GA	105	18.55%
3.8.3-GA	85	15.02%
3.8.6-GA	69	12.19%
3.8.7a	50	8.83%
3.8.5-GA	42	7.42%
3.7.5a-GA	42	7.42%
3.10.2-GA	32	5.65%
3.8.2-GA	25	4.42%
3.7.3a-GA	24	4.24%
3.7.4b-GA	20	3.53%
4.0.5a	15	2.65%
3.7.5-GA	9	1.59%
Other	48	8.48%
InterScan VirusWall (546 servers)
Version	Number of Servers	Percent
Other	546	100.00%
VisNetic (483 servers)
Version	Number of Servers	Percent
9.1.4.1	153	31.68%
8.5.0.8	28	5.80%
5.8.6.6	27	5.59%
9.1.4.0	27	5.59%
7.2.4.1	25	5.18%
5.0.2.3	23	4.76%
8.3.5.0	23	4.76%
6.2.2.0	18	3.73%
8.0.3.1	15	3.11%
5.5.8.3	15	3.11%
8.0.3.0	15	3.11%
7.6.1.0	13	2.69%
8.0.3	12	2.48%
8.3.6	11	2.28%
5.3.5.0	11	2.28%
5.4.5.4	9	1.86%
7.5.3.0	8	1.66%
5.8.6.4	7	1.45%
8.5.0.5	5	1.04%
7.2.4.0	5	1.04%
6.0.9.0	5	1.04%
Other	28	5.80%
NetIQ MailMarshal (466 servers)
Version	Number of Servers	Percent
6.0.3.8	367	78.76%
5.5.6.7	25	5.36%
6.1.3.15	23	4.94%
5.5.6.6	12	2.58%
5.5.5.9	7	1.50%
5.5.6.5	7	1.50%
5.5.4.16	7	1.50%
5.5.5.6	5	1.07%
5.5.4.17	5	1.07%
Other	8	1.72%
MagicMail (420 servers)
Version	Number of Servers	Percent
Other	420	100.00%
Interscan (361 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	62	17.17%
3.8-Build_3013	57	15.79%
3.81-Build_1022	48	13.30%
3.55 (build 1029)	36	9.97%
3.53 (build 2017)	31	8.59%
3.53 (build 2011)	19	5.26%
3.53 (build 1493)	16	4.43%
3.81-Build_1084	13	3.60%
3.55 (build 1020)	13	3.60%
3.53 (build 2013)	13	3.60%
3.52 (build 1375)	9	2.49%
3.8-Build_1080	8	2.22%
3.8-Build_3045	4	1.11%
Other	32	8.86%
WebSTAR V (172 servers)
Version	Number of Servers	Percent
5.4.1	56	32.56%
5.3.4	40	23.26%
5.4.0	40	23.26%
5.3.3	17	9.88%
5.3.2	15	8.72%
5.3.1	2	1.16%
5.3.0	2	1.16%
Other	0	0.00%
Neon Mail Server (167 servers)
Version	Number of Servers	Percent
3.1.3	56	33.53%
3.0.7	31	18.56%
3.0.9	28	16.77%
3.1.2	18	10.78%
3.1.0	17	10.18%
3.1.4	7	4.19%
3.0.8	3	1.80%
3.1.1	3	1.80%
3.0.5	2	1.20%
3.0.6	2	1.20%
Other	0	0.00%
Mercury (153 servers)
Version	Number of Servers	Percent
1.48	71	46.41%
3.32	48	31.37%
3.21c	11	7.19%
3.31	7	4.58%
1.47	5	3.27%
1.44	3	1.96%
3.21	3	1.96%
1.49	2	1.31%
Other	3	1.96%
ModusMail (93 servers)
Version	Number of Servers	Percent
4.35.480.0	21	22.58%
3.2.315.0	16	17.20%
4.35.477.0	12	12.90%
4.3.459.0	9	9.68%
4.35.480.11	8	8.60%
3.1.302.0	6	6.45%
4.2.420.0	4	4.30%
4.1.361.21	3	3.23%
4.1.361.0	3	3.23%
4.2.425.4	2	2.15%
3.1.293.1	2	2.15%
4.2.425.22	1	1.08%
4.35.480	1	1.08%
4.2.420.1	1	1.08%
4.0.340.3	1	1.08%
4.0.330.8	1	1.08%
1.4.232.0	1	1.08%
4.35.477.8	1	1.08%
Other	0	0.00%
MessageWall (69 servers)
Version	Number of Servers	Percent
1.0.8	51	73.91%
1.0.11	15	21.74%
1.1.0	2	2.90%
1.0.6	1	1.45%
Other	0	0.00%
WebSTAR (65 servers)
Version	Number of Servers	Percent
Other	65	100.00%
MAILsweeper (53 servers)
Version	Number of Servers	Percent
4.3.20.0	15	28.30%
4.3.14.0	8	15.09%
4.3.17.0	8	15.09%
4.3.1.0	5	9.43%
4.3.19.0	4	7.55%
4.2.10.0	4	7.55%
4.3.10.0	2	3.77%
4.3.12.0	2	3.77%
4.3.6.0	2	3.77%
4.2.1.0	1	1.89%
4.2.5.0	1	1.89%
4.1.5.0	1	1.89%
Other	0	0.00%
OpenVMS (27 servers)
Version	Number of Servers	Percent
8.3	16	59.26%
7.3	6	22.22%
8.2	3	11.11%
6.1	1	3.70%
7.2	1	3.70%
Other	0	0.00%