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	2,059,433	100.0%
Number of Servers that didn't respond	332,470	16.14%
Server didn't open socket	319,650	15.52%
Server didn't provide banner	12,820	0.62%
Server provided banner	1,726,963	83.86%
Server banner identifies software in use	958,708	46.55%

As indicated by the above table, of the 2,059,433 servers queried, only 958,708 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	303,873	31.70%
Postfix	193,987	20.23%
Microsoft	182,142	19.00%
Sendmail	172,379	17.98%
MailEnable	29,737	3.10%
MDaemon	23,054	2.40%
IMail	14,272	1.49%
Kerio	7,602	0.79%
Lotus Domino	5,593	0.58%
WinWebMail	5,017	0.52%
CommuniGate Pro	4,043	0.42%
Merak	3,076	0.32%
XMail	2,661	0.28%
Qmail Toaster	1,829	0.19%
ArGoSoft	1,569	0.16%
GroupWise	1,543	0.16%
SurgeSMTP	1,456	0.15%
Trend Micro	1,181	0.12%
Gordano Messaging Suite (GMS)	653	0.07%
Post.Office	595	0.06%
MagicMail	471	0.05%
Mirapoint	426	0.04%
InterScan VirusWall	355	0.04%
VisNetic	355	0.04%
NetIQ MailMarshal	196	0.02%
Interscan	158	0.02%
Mercury	106	0.01%
Neon Mail Server	93	0.01%
WebSTAR V	92	0.01%
ModusMail	54	0.01%
MessageWall	47	0.00%
WebSTAR	34	0.00%
MAILsweeper	29	0.00%
OpenVMS	28	0.00%
OpenSMTPD	2	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (303,873 servers)
Version	Number of Servers	Percent
4.69	254,662	83.81%
4.63	13,882	4.57%
4.67	13,854	4.56%
4.66	4,054	1.33%
4.71	3,460	1.14%
Other	13,961	4.59%
Postfix (193,987 servers)
Version	Number of Servers	Percent
Other	193,987	100.00%
Microsoft (182,142 servers)
Version	Number of Servers	Percent
6.0.3790.3959	157,324	86.37%
6.0.3790.1830	14,132	7.76%
5.0.2195.6713	6,872	3.77%
Other	3,814	2.09%
Sendmail (172,379 servers)
Version	Number of Servers	Percent
8.13.1	33,985	19.72%
8.13.8	24,996	14.50%
8.14.3	15,085	8.75%
8.12.11.20060614	14,742	8.55%
8.12.11.20060308	14,014	8.13%
8.13.6	11,030	6.40%
8.13.6.20060614	10,350	6.00%
8.12.10	6,395	3.71%
8.11.6	5,938	3.44%
8.14.2	5,383	3.12%
8.12.11	4,316	2.50%
8.14.1	4,307	2.50%
8.14.4	4,101	2.38%
8.13.4	3,322	1.93%
8.13.7	3,163	1.83%
8.12.8	2,811	1.63%
8.9.3	1,740	1.01%
Other	6,701	3.89%
MailEnable (29,737 servers)
Version	Number of Servers	Percent
1.986--	8,545	28.74%
1.981--	3,779	12.71%
1.983--	2,446	8.23%
3.62--	1,598	5.37%
1.96--	729	2.45%
0-3.63-	702	2.36%
1.95--	692	2.33%
1.9--	585	1.97%
0-3.61-	481	1.62%
0-3.6-	471	1.58%
0-1.87-	444	1.49%
0-2.53-	425	1.43%
4.0--	418	1.41%
4.17--	397	1.34%
--3.63	383	1.29%
1.8--	377	1.27%
0-3.62-	376	1.26%
0-3.14-	368	1.24%
0-2.37-	326	1.10%
Other	6,195	20.83%
MDaemon (23,054 servers)
Version	Number of Servers	Percent
10.1.2	5,302	23.00%
10.1.1	2,037	8.84%
10.0.0	1,452	6.30%
9.6.1	1,067	4.63%
9.6.6	924	4.01%
10.0.5	900	3.90%
10.1.0	865	3.75%
9.6.5	728	3.16%
10.0.4	675	2.93%
9.5.2	658	2.85%
10.0.2	568	2.46%
9.6.4	552	2.39%
9.5.1	528	2.29%
8.1.3	521	2.26%
9.5.6	495	2.15%
9.6.2	491	2.13%
9.0.4	452	1.96%
9.6.3	312	1.35%
7.2.3	296	1.28%
6.8.5	284	1.23%
9.5.5	269	1.17%
9.0.1	263	1.14%
10.0.1	247	1.07%
7.2.0	236	1.02%
Other	2,932	12.72%
IMail (14,272 servers)
Version	Number of Servers	Percent
8.22	2,602	18.23%
8.15	1,398	9.80%
9.23	1,119	7.84%
11.0	1,078	7.55%
11.01	997	6.99%
10.02	926	6.49%
8.05	755	5.29%
9.10	556	3.90%
9.20	541	3.79%
7.07	503	3.52%
10.01	476	3.34%
9.21	408	2.86%
7.15	372	2.61%
6.06	309	2.17%
8.00	262	1.84%
8.04	187	1.31%
8.21	181	1.27%
8.10	174	1.22%
10.0	173	1.21%
9.22	155	1.09%
8.01	147	1.03%
Other	953	6.68%
Kerio (7,602 servers)
Version	Number of Servers	Percent
6.7.3	1,937	25.48%
6.7.2	1,127	14.83%
6.7.0	775	10.19%
6.6.2	758	9.97%
6.7.1	480	6.31%
6.5.2	338	4.45%
6.5.0	324	4.26%
6.4.1	248	3.26%
6.3.1	235	3.09%
6.6.0	178	2.34%
6.5.1	168	2.21%
6.4.0	160	2.10%
6.6.1	133	1.75%
6.4.2	126	1.66%
6.3.0	102	1.34%
Other	513	6.75%
Lotus Domino (5,593 servers)
Version	Number of Servers	Percent
8.5.1	659	11.78%
8.5	544	9.73%
7.0.2	418	7.47%
8.0.2	302	5.40%
8.0.1	264	4.72%
7.0.3	263	4.70%
7.0.1	235	4.20%
6.5.4	209	3.74%
6.5.1	197	3.52%
6.5.3	167	2.99%
7.0.2FP2	165	2.95%
7.0.3FP1	161	2.88%
8.5FP1	151	2.70%
6.5.5	141	2.52%
7.0	134	2.40%
8.0	133	2.38%
6.5	127	2.27%
5.0.11	76	1.36%
8.5.1FP1	69	1.23%
7.0.2FP3	64	1.14%
6.5.2	59	1.05%
6.5.6	58	1.04%
Other	997	17.83%
WinWebMail (5,017 servers)
Version	Number of Servers	Percent
3.8.0.1	1,307	26.05%
3.7.6.1	922	18.38%
3.7.3.1	694	13.83%
3.7.7.3	691	13.77%
3.7.1.1	379	7.55%
3.7.5.1	238	4.74%
3.6.3.1	182	3.63%
3.7.7.1	171	3.41%
3.7.0.5	166	3.31%
3.7.0.7	117	2.33%
3.7.0.3	113	2.25%
Other	37	0.74%
CommuniGate Pro (4,043 servers)
Version	Number of Servers	Percent
5.2.16	273	6.75%
4.1.8	251	6.21%
5.1.13	179	4.43%
4.2.10	165	4.08%
5.2.14	149	3.69%
5.1.16	144	3.56%
5.2.12	135	3.34%
5.2.13	113	2.79%
5.3.2	112	2.77%
5.2.18	111	2.75%
5.1.12	104	2.57%
5.2.3	102	2.52%
5.2.17	98	2.42%
5.3.1	97	2.40%
5.2.8	96	2.37%
5.2.19	96	2.37%
5.2.10	83	2.05%
5.0.14	77	1.90%
5.2.11	67	1.66%
5.1.14	63	1.56%
5.2.9	60	1.48%
5.2.6	58	1.43%
5.0.9	58	1.43%
5.2.15	55	1.36%
5.1.9	51	1.26%
5.2.0	46	1.14%
4.2.8	44	1.09%
Other	1,156	28.59%
Merak (3,076 servers)
Version	Number of Servers	Percent
8.0.3	1,277	41.51%
8.9.1	297	9.66%
8.5.0	186	6.05%
7.4.5	179	5.82%
7.5.2	135	4.39%
7.6.4	128	4.16%
8.3.8	117	3.80%
7.4.2	55	1.79%
7.2.0	47	1.53%
8.2.13	46	1.50%
9.0.0	45	1.46%
7.6.1	41	1.33%
8.3.15	33	1.07%
6.2.1	32	1.04%
8.2.4	32	1.04%
7.0.1	31	1.01%
Other	395	12.84%
XMail (2,661 servers)
Version	Number of Servers	Percent
1.25	719	27.02%
1.22	652	24.50%
1.24	394	14.81%
1.26	327	12.29%
1.21	161	6.05%
1.23	83	3.12%
1.20	75	2.82%
1.17	64	2.41%
1.12	57	2.14%
Other	129	4.85%
Qmail Toaster (1,829 servers)
Version	Number of Servers	Percent
1.3	1,635	89.39%
1.2	148	8.09%
1.0	31	1.69%
Other	15	0.82%
ArGoSoft (1,569 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.5)	286	18.23%
1.8 (1.8.9.6)	238	15.17%
1.8 (1.8.9.3)	230	14.66%
1.8 (1.8.9.1)	146	9.31%
1.8 (1.8.8.8)	121	7.71%
1.8 (1.8.8.7)	101	6.44%
1.8 (1.8.9.2)	67	4.27%
1.8 (1.8.9.4)	42	2.68%
1.8 (1.8.8.9)	36	2.29%
1.8 (1.8.8.1)	34	2.17%
1.8 (1.8.6.0)	27	1.72%
1.8 (1.8.9.0)	26	1.66%
1.8 (1.8.8.2)	16	1.02%
Other	199	12.68%
GroupWise (1,543 servers)
Version	Number of Servers	Percent
7.0.3	479	31.04%
7.0.2	189	12.25%
6.5.7	179	11.60%
8.0.1	150	9.72%
7.0.1	101	6.55%
6.5.4	90	5.83%
8.0.0	78	5.06%
6.5.6	61	3.95%
6.0.4	54	3.50%
6.5.1	41	2.66%
6.5.5	26	1.69%
7.0	20	1.30%
Other	75	4.86%
SurgeSMTP (1,456 servers)
Version	Number of Servers	Percent
4.2d2-2	279	19.16%
3.9e-1	238	16.35%
4.2a3-3	215	14.77%
4.0u4-4	115	7.90%
3.8k4-4	92	6.32%
3.8i3-3	39	2.68%
3.7b8-8	36	2.47%
3.9c-1	36	2.47%
3.8f3-3	33	2.27%
3.6f5-5	29	1.99%
3.9h-65	28	1.92%
3.9g2-2	24	1.65%
3.5b3-3	21	1.44%
3.8f2-2	20	1.37%
Other	251	17.24%
Trend Micro (1,181 servers)
Version	Number of Servers	Percent
5.7	542	45.89%
5.5	347	29.38%
5.18	178	15.07%
7.0	87	7.37%
7	12	1.02%
Other	15	1.27%
Gordano Messaging Suite (GMS) (653 servers)
Version	Number of Servers	Percent
Other	653	100.00%
Post.Office (595 servers)
Version	Number of Servers	Percent
3.5.3	103	17.31%
4.1.0.2	68	11.43%
4.0.1	52	8.74%
3.5.3J	43	7.23%
3.8.3	29	4.87%
4.1.0.4	20	3.36%
3.9.2.3	19	3.19%
3.1.2J	18	3.03%
4.1.1	17	2.86%
3.6.3	16	2.69%
3.9.1	16	2.69%
3.9.2	14	2.35%
3.6.2	14	2.35%
3.8.7.4	13	2.18%
4.1	12	2.02%
3.1.2	11	1.85%
4.0.0.2	11	1.85%
4.0.0.1	10	1.68%
3.8.4	10	1.68%
4.1.0.3	9	1.51%
3.9.0	9	1.51%
3.9.1.3	8	1.34%
3.9.2.1	8	1.34%
3.9.1.2	7	1.18%
4.0.1.1	7	1.18%
3.5.2	6	1.01%
Other	45	7.56%
MagicMail (471 servers)
Version	Number of Servers	Percent
Other	471	100.00%
Mirapoint (426 servers)
Version	Number of Servers	Percent
3.8.4-GA	50	11.74%
3.10.8-GA	50	11.74%
3.8.3-GA	44	10.33%
3.10.7-GA	39	9.15%
3.10.5-GA	38	8.92%
3.10.4-GA	23	5.40%
4.1.8-GA	18	4.23%
3.10.3-GA	16	3.76%
3.10.6-GA	15	3.52%
4.1.3-GA	14	3.29%
3.8.6-GA	13	3.05%
3.8.7a	12	2.82%
3.8.5-GA	10	2.35%
3.8.2-GA	10	2.35%
4.1.4-GA	10	2.35%
3.7.5a-GA	9	2.11%
4.1.5-GA	8	1.88%
4.0.5a	7	1.64%
3.10.2-GA	6	1.41%
4.1.7a-GA	6	1.41%
4.1.6-GA	6	1.41%
3.7.4b-GA	5	1.17%
Other	17	3.99%
InterScan VirusWall (355 servers)
Version	Number of Servers	Percent
Other	355	100.00%
VisNetic (355 servers)
Version	Number of Servers	Percent
9.3.2.0	138	38.87%
9.1.4.1	44	12.39%
5.8.6.6	20	5.63%
8.5.0.8	14	3.94%
6.2.2.0	12	3.38%
5.5.8.3	12	3.38%
9.1.4.0	10	2.82%
5.0.2.3	9	2.54%
8.3.5.0	8	2.25%
5.4.5.4	8	2.25%
8.0.3.0	7	1.97%
7.6.1.0	7	1.97%
8.0.3.1	7	1.97%
8.3.6	6	1.69%
5.3.5.0	6	1.69%
8.0.3	6	1.69%
7.2.4.1	6	1.69%
7.2.4.0	4	1.13%
Other	31	8.73%
NetIQ MailMarshal (196 servers)
Version	Number of Servers	Percent
6.0.3.8	148	75.51%
5.5.6.7	14	7.14%
6.1.3.15	13	6.63%
5.5.6.6	4	2.04%
5.5.6.5	4	2.04%
5.5.4.16	4	2.04%
5.5.3.17	2	1.02%
5.5.5.6	2	1.02%
Other	5	2.55%
Interscan (158 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	29	18.35%
3.55 (build 1029)	19	12.03%
3.81-Build_1022	18	11.39%
3.53 (build 2017)	17	10.76%
3.81-Build_1084	12	7.59%
3.8-Build_3013	11	6.96%
3.53 (build 1493)	9	5.70%
3.53 (build 2011)	7	4.43%
3.55 (build 1020)	7	4.43%
3.53 (build 2013)	6	3.80%
3.52 (build 1375)	3	1.90%
3.53 (build 1494)	2	1.27%
3.81-Build_1055	2	1.27%
3.8-Build_1080	2	1.27%
Other	14	8.86%
Mercury (106 servers)
Version	Number of Servers	Percent
1.48	52	49.06%
3.32	29	27.36%
3.21c	10	9.43%
3.21	3	2.83%
1.47	3	2.83%
1.44	2	1.89%
3.01a	2	1.89%
1.49	2	1.89%
Other	3	2.83%
Neon Mail Server (93 servers)
Version	Number of Servers	Percent
3.1.3	23	24.73%
3.0.7	18	19.35%
3.1.4	11	11.83%
3.0.9	11	11.83%
3.1.2	10	10.75%
3.1.0	8	8.60%
3.1.5	7	7.53%
3.1.1	2	2.15%
3.0.8	1	1.08%
3.0.6	1	1.08%
3.0.5	1	1.08%
Other	0	0.00%
WebSTAR V (92 servers)
Version	Number of Servers	Percent
5.4.1	30	32.61%
5.3.4	23	25.00%
5.4.0	23	25.00%
5.3.2	7	7.61%
5.3.3	6	6.52%
5.3.0	1	1.09%
5.2.3	1	1.09%
5.3.1	1	1.09%
Other	0	0.00%
ModusMail (54 servers)
Version	Number of Servers	Percent
3.2.315.0	16	29.63%
4.35.477.0	10	18.52%
3.1.302.0	6	11.11%
4.35.480.0	6	11.11%
4.2.420.0	5	9.26%
4.1.361.21	2	3.70%
3.1.293.1	2	3.70%
4.35.480.11	2	3.70%
4.2.425.22	1	1.85%
4.1.361.0	1	1.85%
4.0.340.3	1	1.85%
4.3.459.0	1	1.85%
4.35.477.8	1	1.85%
Other	0	0.00%
MessageWall (47 servers)
Version	Number of Servers	Percent
1.0.8	30	63.83%
1.0.11	15	31.91%
1.0.6	1	2.13%
1.1.0	1	2.13%
Other	0	0.00%
WebSTAR (34 servers)
Version	Number of Servers	Percent
Other	34	100.00%
MAILsweeper (29 servers)
Version	Number of Servers	Percent
4.3.20.0	7	24.14%
4.3.17.0	5	17.24%
4.3.14.0	5	17.24%
4.3.1.0	4	13.79%
4.2.10.0	2	6.90%
4.3.6.0	2	6.90%
4.3.19.0	1	3.45%
4.3.10.0	1	3.45%
4.3.12.0	1	3.45%
4.2.5.0	1	3.45%
Other	0	0.00%
OpenVMS (28 servers)
Version	Number of Servers	Percent
8.3	18	64.29%
7.3	6	21.43%
8.2	2	7.14%
6.1	1	3.57%
7.2	1	3.57%
Other	0	0.00%
OpenSMTPD (2 servers)
Version	Number of Servers	Percent
Other	2	100.00%