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	1,854,017	100.0%
Number of Servers that didn't respond	292,657	15.79%
Server didn't open socket	281,214	15.17%
Server didn't provide banner	11,443	0.62%
Server provided banner	1,561,360	84.21%
Server banner identifies software in use	921,540	49.71%

As indicated by the above table, of the 1,854,017 servers queried, only 921,540 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
Sendmail	235,308	25.53%
Exim	210,003	22.79%
Microsoft	203,393	22.07%
Postfix	151,652	16.46%
IMail	24,913	2.70%
MailEnable	23,860	2.59%
MDaemon	22,975	2.49%
Lotus Domino	6,864	0.74%
Merak	5,972	0.65%
Kerio	5,672	0.62%
WinWebMail	4,961	0.54%
CommuniGate Pro	4,896	0.53%
Trend Micro	3,149	0.34%
GroupWise	2,936	0.32%
XMail	2,671	0.29%
ArGoSoft	2,596	0.28%
SurgeSMTP	1,769	0.19%
Qmail Toaster	1,678	0.18%
Gordano Messaging Suite (GMS)	991	0.11%
Post.Office	918	0.10%
NetIQ MailMarshal	663	0.07%
InterScan VirusWall	647	0.07%
Mirapoint	583	0.06%
VisNetic	519	0.06%
Interscan	498	0.05%
MagicMail	400	0.04%
WebSTAR V	212	0.02%
Mercury	194	0.02%
ModusMail	186	0.02%
Neon Mail Server	178	0.02%
MAILsweeper	91	0.01%
WebSTAR	82	0.01%
MessageWall	79	0.01%
OpenVMS	31	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Sendmail (235,308 servers)
Version	Number of Servers	Percent
8.12.11.20060614	34,639	14.72%
8.13.1	34,612	14.71%
8.12.11.20060308	22,847	9.71%
8.13.6	22,317	9.48%
8.11.6	19,135	8.13%
8.13.8	17,113	7.27%
8.12.10	13,999	5.95%
8.13.6.20060614	10,764	4.57%
8.14.1	9,388	3.99%
8.12.11	8,172	3.47%
8.13.4	7,069	3.00%
8.12.8	6,028	2.56%
8.14.2	5,912	2.51%
8.13.7	5,641	2.40%
8.9.3	3,435	1.46%
8.10.2	3,015	1.28%
Other	11,222	4.77%
Exim (210,003 servers)
Version	Number of Servers	Percent
4.68	139,734	66.54%
4.63	28,673	13.65%
4.67	6,271	2.99%
4.60	6,110	2.91%
4.50	5,690	2.71%
4.66	5,358	2.55%
4.69	4,434	2.11%
4.62	4,194	2.00%
Other	9,539	4.54%
Microsoft (203,393 servers)
Version	Number of Servers	Percent
6.0.3790.3959	130,369	64.10%
6.0.3790.1830	43,442	21.36%
5.0.2195.6713	18,296	9.00%
6.0.3790.211	6,807	3.35%
Other	4,479	2.20%
Postfix (151,652 servers)
Version	Number of Servers	Percent
Other	151,652	100.00%
IMail (24,913 servers)
Version	Number of Servers	Percent
8.22	5,240	21.03%
8.15	4,474	17.96%
9.23	2,805	11.26%
8.05	1,475	5.92%
9.10	1,393	5.59%
9.21	1,199	4.81%
7.07	975	3.91%
7.15	918	3.68%
9.22	785	3.15%
6.06	673	2.70%
8.00	590	2.37%
9.20	573	2.30%
8.21	457	1.83%
8.04	358	1.44%
8.10	290	1.16%
8.01	285	1.14%
8.20	279	1.12%
Other	2,144	8.61%
MailEnable (23,860 servers)
Version	Number of Servers	Percent
1.981--	5,950	24.94%
1.983--	2,596	10.88%
1.96--	1,604	6.72%
1.95--	1,478	6.19%
1.9--	1,240	5.20%
1.8--	1,006	4.22%
0-1.85-	886	3.71%
0-2.37-	863	3.62%
0-2.38-	481	2.02%
0-3.14-	474	1.99%
0-3.04-	465	1.95%
0-2.36-	434	1.82%
1.986--	344	1.44%
0--2.37	324	1.36%
0--2.38	246	1.03%
0-2.40-	241	1.01%
Other	5,228	21.91%
MDaemon (22,975 servers)
Version	Number of Servers	Percent
9.6.5	3,971	17.28%
9.6.4	2,684	11.68%
9.6.2	1,407	6.12%
9.6.1	1,339	5.83%
9.6.3	1,045	4.55%
9.5.6	1,025	4.46%
8.1.3	1,018	4.43%
9.0.4	927	4.03%
9.5.2	774	3.37%
9.5.1	681	2.96%
6.8.5	588	2.56%
7.2.3	539	2.35%
7.2.0	462	2.01%
9.0.1	457	1.99%
9.5.5	373	1.62%
8.0.2	353	1.54%
9.0.0	345	1.50%
8.1.4	344	1.50%
9.5.4	313	1.36%
8.1.1	301	1.31%
9.6.0	292	1.27%
8.1.5	251	1.09%
8.0.3	247	1.08%
7.1.2	243	1.06%
9.5.3	239	1.04%
Other	2,757	12.00%
Lotus Domino (6,864 servers)
Version	Number of Servers	Percent
7.0.2	870	12.67%
7.0.1	438	6.38%
6.5.4	436	6.35%
7.0.2FP2	433	6.31%
6.5.1	374	5.45%
7.0.3	369	5.38%
6.5.3	334	4.87%
8.0	291	4.24%
7.0	289	4.21%
8.0.1	285	4.15%
6.5.5	284	4.14%
6.5	234	3.41%
7.0.2FP1	226	3.29%
5.0.11	160	2.33%
6.5.2	152	2.21%
5.0.12	102	1.49%
6.5.6	95	1.38%
5.0.8	90	1.31%
5.0.13a	86	1.25%
6.5.5FP2	84	1.22%
5.0.10	82	1.19%
6.5.4FP3	71	1.03%
7.0.1FP1	70	1.02%
Other	1,009	14.70%
Merak (5,972 servers)
Version	Number of Servers	Percent
8.0.3	2,085	34.91%
8.9.1	716	11.99%
8.5.0	433	7.25%
7.4.5	291	4.87%
8.3.8	275	4.60%
7.5.2	264	4.42%
7.6.4	260	4.35%
9.0.0	158	2.65%
7.4.2	144	2.41%
7.2.0	104	1.74%
8.2.4	91	1.52%
6.2.1	89	1.49%
7.6.1	77	1.29%
8.9.0	72	1.21%
8.3.0	69	1.16%
Other	844	14.13%
Kerio (5,672 servers)
Version	Number of Servers	Percent
6.5.0	1,341	23.64%
6.4.1	873	15.39%
6.4.2	849	14.97%
6.3.1	719	12.68%
6.4.0	489	8.62%
6.3.0	243	4.28%
6.2.2	109	1.92%
6.1.3	100	1.76%
6.1.0	89	1.57%
6.2.0	89	1.57%
6.0.10	83	1.46%
6.1.2	77	1.36%
6.1.4	74	1.30%
6.0.3	62	1.09%
Other	475	8.37%
WinWebMail (4,961 servers)
Version	Number of Servers	Percent
3.7.3.1	1,533	30.90%
3.7.1.1	875	17.64%
3.7.6.1	564	11.37%
3.7.5.1	558	11.25%
3.6.3.1	471	9.49%
3.7.0.5	403	8.12%
3.7.0.7	257	5.18%
3.7.0.3	242	4.88%
Other	58	1.17%
CommuniGate Pro (4,896 servers)
Version	Number of Servers	Percent
4.1.8	499	10.19%
4.2.10	312	6.37%
5.1.13	300	6.13%
5.1.12	272	5.56%
5.2.0	218	4.45%
5.1.14	214	4.37%
5.1.10	185	3.78%
5.0.9	159	3.25%
5.2.1	156	3.19%
5.0.13	156	3.19%
5.1.9	116	2.37%
5.1.7	112	2.29%
5.1.8	109	2.23%
5.1.11	107	2.19%
4.2.8	84	1.72%
4.2.7	79	1.61%
4.3.12	76	1.55%
4.2	74	1.51%
4.2.9	72	1.47%
5.1.5	70	1.43%
5.0.11	69	1.41%
5.0.14	66	1.35%
4.0.6	64	1.31%
5.2	61	1.25%
5.0.8	61	1.25%
5.1.3	59	1.21%
Other	1,146	23.41%
Trend Micro (3,149 servers)
Version	Number of Servers	Percent
5.7	1,467	46.59%
5.5	1,142	36.27%
5.18	411	13.05%
7.0	78	2.48%
Other	51	1.62%
GroupWise (2,936 servers)
Version	Number of Servers	Percent
7.0.2	928	31.61%
7.0.1	374	12.74%
6.5.7	360	12.26%
6.5.4	218	7.43%
7.0.3	215	7.32%
6.5.6	152	5.18%
6.0.4	139	4.73%
7.0	105	3.58%
6.5.5	100	3.41%
6.5.1	91	3.10%
6.5.2	39	1.33%
6.0.2	35	1.19%
6.0.3	32	1.09%
6.5.3	31	1.06%
Other	117	3.99%
XMail (2,671 servers)
Version	Number of Servers	Percent
1.22	852	31.90%
1.24	590	22.09%
1.21	305	11.42%
1.25	288	10.78%
1.20	142	5.32%
1.17	128	4.79%
1.23	125	4.68%
1.12	80	3.00%
1.16	44	1.65%
1.18	30	1.12%
Other	87	3.26%
ArGoSoft (2,596 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.3)	628	24.19%
1.8 (1.8.9.1)	393	15.14%
1.8 (1.8.8.8)	274	10.55%
1.8 (1.8.8.7)	232	8.94%
1.8 (1.8.9.2)	195	7.51%
1.8 (1.8.8.9)	96	3.70%
1.8 (1.8.9.4)	87	3.35%
1.8 (1.8.9.0)	55	2.12%
1.8 (1.8.8.1)	53	2.04%
1.8 (1.8.8.2)	48	1.85%
1.8 (1.8.6.0)	45	1.73%
1.8 (1.8.5.9)	32	1.23%
1.8 (1.8.7.5)	30	1.16%
1.8 (1.8.8.3)	28	1.08%
1.8 (1.8.8.4)	26	1.00%
Other	374	14.41%
SurgeSMTP (1,769 servers)
Version	Number of Servers	Percent
3.9c-1	455	25.72%
3.8k4-4	356	20.12%
3.8i3-3	156	8.82%
3.7b8-8	94	5.31%
3.8f3-3	93	5.26%
3.6f5-5	66	3.73%
3.9a-1	64	3.62%
3.5b3-3	61	3.45%
3.8f2-2	52	2.94%
3.9d-7	44	2.49%
3.0c2-2	41	2.32%
3.7b6-6	31	1.75%
3.8k2-2	26	1.47%
3.8i-1	19	1.07%
Other	211	11.93%
Qmail Toaster (1,678 servers)
Version	Number of Servers	Percent
1.3	1,266	75.45%
1.2	328	19.55%
1.0	68	4.05%
Other	16	0.95%
Gordano Messaging Suite (GMS) (991 servers)
Version	Number of Servers	Percent
Other	991	100.00%
Post.Office (918 servers)
Version	Number of Servers	Percent
3.5.3	236	25.71%
4.0.1	88	9.59%
3.5.3J	67	7.30%
3.6.3	54	5.88%
3.8.3	52	5.66%
3.6.2	38	4.14%
3.9.1	35	3.81%
3.9.2.3	34	3.70%
3.1.2J	27	2.94%
3.9.2	23	2.51%
3.8.7.4	23	2.51%
3.1.2	22	2.40%
3.9.0	22	2.40%
3.8.4	20	2.18%
3.5.2	15	1.63%
4.1	14	1.53%
4.0.0.2	14	1.53%
3.9.1.3	12	1.31%
4.0.0.1	12	1.31%
4.1.0.2	11	1.20%
3.6.0	11	1.20%
3.8.2	10	1.09%
3.9.2.1	10	1.09%
Other	68	7.41%
NetIQ MailMarshal (663 servers)
Version	Number of Servers	Percent
6.0.3.8	512	77.22%
5.5.6.7	38	5.73%
6.1.3.15	34	5.13%
5.5.4.16	17	2.56%
5.5.6.6	14	2.11%
5.5.5.9	13	1.96%
5.5.6.5	9	1.36%
5.5.5.6	7	1.06%
Other	19	2.87%
InterScan VirusWall (647 servers)
Version	Number of Servers	Percent
Other	647	100.00%
Mirapoint (583 servers)
Version	Number of Servers	Percent
3.8.4-GA	118	20.24%
3.8.3-GA	96	16.47%
3.8.6-GA	79	13.55%
3.8.5-GA	74	12.69%
3.7.5a-GA	53	9.09%
3.8.2-GA	40	6.86%
3.7.3a-GA	24	4.12%
3.7.4b-GA	24	4.12%
3.7.5-GA	13	2.23%
3.5.8-GR	11	1.89%
1.1.0	8	1.37%
3.7.2-GA	6	1.03%
3.7.1-GA	6	1.03%
Other	31	5.32%
VisNetic (519 servers)
Version	Number of Servers	Percent
9.1.4.1	97	18.69%
9.1.4.0	50	9.63%
8.5.0.8	38	7.32%
5.8.6.6	31	5.97%
7.2.4.1	29	5.59%
5.0.2.3	28	5.39%
8.3.5.0	25	4.82%
8.0.3.0	25	4.82%
5.5.8.3	22	4.24%
6.2.2.0	19	3.66%
8.0.3.1	17	3.28%
8.0.3	15	2.89%
7.6.1.0	14	2.70%
5.3.5.0	13	2.50%
8.3.6	11	2.12%
7.5.3.0	11	2.12%
5.4.5.4	10	1.93%
8.5.0.5	9	1.73%
7.2.4.0	8	1.54%
5.8.6.4	7	1.35%
Other	40	7.71%
Interscan (498 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	88	17.67%
3.8-Build_3013	65	13.05%
3.81-Build_1022	57	11.45%
3.55 (build 1029)	51	10.24%
3.53 (build 2017)	42	8.43%
3.53 (build 2011)	40	8.03%
3.81-Build_1084	27	5.42%
3.53 (build 2013)	22	4.42%
3.53 (build 1493)	21	4.22%
3.55 (build 1020)	13	2.61%
3.52 (build 1375)	12	2.41%
3.8-Build_1080	9	1.81%
3.55 (build 1018)	6	1.20%
3.8-Build_3065	5	1.00%
Other	40	8.03%
MagicMail (400 servers)
Version	Number of Servers	Percent
Other	400	100.00%
WebSTAR V (212 servers)
Version	Number of Servers	Percent
5.4.1	62	29.25%
5.4.0	56	26.42%
5.3.4	47	22.17%
5.3.3	22	10.38%
5.3.2	17	8.02%
5.3.0	6	2.83%
Other	2	0.94%
Mercury (194 servers)
Version	Number of Servers	Percent
1.48	88	45.36%
3.32	63	32.47%
3.21c	19	9.79%
3.31	7	3.61%
1.44	5	2.58%
1.47	5	2.58%
1.49	2	1.03%
3.21	2	1.03%
Other	3	1.55%
ModusMail (186 servers)
Version	Number of Servers	Percent
4.35.480.0	78	41.94%
4.1.361.21	23	12.37%
3.2.315.0	17	9.14%
4.35.477.0	13	6.99%
3.1.302.0	8	4.30%
4.3.459.0	8	4.30%
4.35.480.11	7	3.76%
4.2.425.22	7	3.76%
4.2.420.0	5	2.69%
3.1.293.1	3	1.61%
4.1.361.0	3	1.61%
4.0.340.0	3	1.61%
4.2.420.1	2	1.08%
4.4.568.0	2	1.08%
Other	7	3.76%
Neon Mail Server (178 servers)
Version	Number of Servers	Percent
3.0.7	42	23.60%
3.0.9	36	20.22%
3.1.3	34	19.10%
3.1.2	28	15.73%
3.1.0	23	12.92%
3.0.8	5	2.81%
3.0.6	4	2.25%
3.1.1	3	1.69%
3.0.5	2	1.12%
Other	1	0.56%
MAILsweeper (91 servers)
Version	Number of Servers	Percent
4.3.20.0	22	24.18%
4.3.17.0	14	15.38%
4.3.14.0	13	14.29%
4.3.19.0	9	9.89%
4.3.1.0	8	8.79%
4.3.12.0	7	7.69%
4.2.10.0	7	7.69%
4.3.6.0	4	4.40%
4.3.10.0	3	3.30%
4.2.5.0	2	2.20%
4.2.1.0	1	1.10%
4.1.5.0	1	1.10%
Other	0	0.00%
WebSTAR (82 servers)
Version	Number of Servers	Percent
Other	82	100.00%
MessageWall (79 servers)
Version	Number of Servers	Percent
1.0.8	60	75.95%
1.0.11	17	21.52%
1.1.0	2	2.53%
Other	0	0.00%
OpenVMS (31 servers)
Version	Number of Servers	Percent
8.3	12	38.71%
7.3	8	25.81%
8.2	7	22.58%
7.2	4	12.90%
Other	0	0.00%