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	1,578,195	100.0%
Number of Servers that didn't respond	219,218	13.89%
Server didn't open socket	211,462	13.40%
Server didn't provide banner	7,756	0.49%
Server provided banner	1,358,977	86.11%
Server banner identifies software in use	862,140	54.63%

As indicated by the above table, of the 1,578,195 servers queried, only 862,140 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	283,814	32.92%
Microsoft	178,076	20.66%
Exim	156,856	18.19%
Postfix	109,413	12.69%
IMail	39,861	4.62%
MDaemon	19,872	2.30%
MailEnable	17,838	2.07%
Merak	8,238	0.96%
Lotus Domino	8,028	0.93%
CommuniGate Pro	5,252	0.61%
Trend Micro	4,548	0.53%
GroupWise	4,384	0.51%
WinWebMail	3,820	0.44%
Kerio	3,658	0.42%
ArGoSoft	3,021	0.35%
XMail	2,253	0.26%
Gordano Messaging Suite (GMS)	1,617	0.19%
SurgeSMTP	1,580	0.18%
NetIQ MailMarshal	1,560	0.18%
Interscan	1,211	0.14%
InterScan VirusWall	1,206	0.14%
Post.Office	1,157	0.13%
Qmail Toaster	1,042	0.12%
ModusMail	971	0.11%
VisNetic	709	0.08%
Mirapoint	470	0.05%
Mercury	347	0.04%
MAILsweeper	345	0.04%
WebSTAR V	339	0.04%
MagicMail	181	0.02%
MessageWall	157	0.02%
WebSTAR	147	0.02%
Neon Mail Server	135	0.02%
OpenVMS	34	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Sendmail (283,814 servers)
Version	Number of Servers	Percent
8.12.11.20060614	50,775	17.89%
8.11.6	41,690	14.69%
8.12.11.20060308	29,347	10.34%
8.13.6	28,524	10.05%
8.12.10	23,388	8.24%
8.13.1	20,506	7.23%
8.12.11	14,114	4.97%
8.13.4	11,348	4.00%
8.12.8	10,522	3.71%
8.13.8	8,086	2.85%
8.10.2	7,310	2.58%
8.13.6.20060614	7,238	2.55%
8.9.3	6,573	2.32%
8.13.7	6,390	2.25%
8.13.3	3,137	1.11%
Other	14,866	5.24%
Microsoft (178,076 servers)
Version	Number of Servers	Percent
6.0.3790.1830	112,297	63.06%
5.0.2195.6713	36,236	20.35%
6.0.3790.211	18,817	10.57%
5.5.2653.13	2,950	1.66%
6.0.3790.0	2,869	1.61%
Other	4,907	2.76%
Exim (156,856 servers)
Version	Number of Servers	Percent
4.52	115,209	73.45%
4.50	10,039	6.40%
4.60	6,560	4.18%
4.63	5,542	3.53%
4.62	3,737	2.38%
4.44	3,019	1.92%
3.36	1,828	1.17%
Other	10,922	6.96%
Postfix (109,413 servers)
Version	Number of Servers	Percent
Other	109,413	100.00%
IMail (39,861 servers)
Version	Number of Servers	Percent
8.15	10,602	26.60%
8.22	5,304	13.31%
8.05	4,538	11.38%
6.06	3,257	8.17%
9.10	3,010	7.55%
8.21	1,763	4.42%
7.15	1,693	4.25%
7.07	1,545	3.88%
9.04	921	2.31%
8.20	868	2.18%
8.00	684	1.72%
8.10	646	1.62%
8.14	476	1.19%
8.12	446	1.12%
8.02	432	1.08%
Other	3,676	9.22%
MDaemon (19,872 servers)
Version	Number of Servers	Percent
8.1.3	1,779	8.95%
9.5.2	1,476	7.43%
9.0.4	1,300	6.54%
9.5.1	1,068	5.37%
6.8.5	1,059	5.33%
9.0.6	999	5.03%
9.0.7	908	4.57%
7.2.3	882	4.44%
7.2.0	788	3.97%
8.1.4	787	3.96%
9.0.1	762	3.83%
9.0.0	602	3.03%
8.0.2	581	2.92%
9.0.5	550	2.77%
8.0.3	470	2.37%
8.1.5	460	2.31%
8.1.1	459	2.31%
7.1.2	401	2.02%
7.1.0	365	1.84%
9.5.3	363	1.83%
7.2.2	349	1.76%
6.8.4	334	1.68%
7.2.1	314	1.58%
9.0.8	310	1.56%
8.0.1	306	1.54%
7.0.1	301	1.51%
Other	1,899	9.56%
MailEnable (17,838 servers)
Version	Number of Servers	Percent
1.8--	2,479	13.90%
1.9--	2,332	13.07%
1.96--	1,956	10.97%
1.95--	1,656	9.28%
0-1.75-	767	4.30%
0-1.54-	657	3.68%
0-1.6-	583	3.27%
0-1.79-	558	3.13%
0-2.32-	543	3.04%
1.73--	392	2.20%
0-2.11-	356	2.00%
0-2.2-	341	1.91%
0--2.2	282	1.58%
0-1.71-	255	1.43%
1.91--	252	1.41%
0-1.72-	240	1.35%
0--2.32	240	1.35%
1.71--	235	1.32%
1.92--	208	1.17%
Other	3,506	19.65%
Merak (8,238 servers)
Version	Number of Servers	Percent
8.5.0	2,260	27.43%
8.0.3	1,782	21.63%
8.3.8	656	7.96%
7.4.5	455	5.52%
7.6.4	344	4.18%
7.5.2	325	3.95%
8.2.4	221	2.68%
7.4.2	212	2.57%
7.2.0	187	2.27%
6.2.1	138	1.68%
8.3.0	119	1.44%
7.4.0	116	1.41%
7.6.1	106	1.29%
4.4.2	93	1.13%
Other	1,224	14.86%
Lotus Domino (8,028 servers)
Version	Number of Servers	Percent
6.5.4	804	10.01%
6.5.1	756	9.42%
7.0.1	730	9.09%
6.5.3	598	7.45%
7.0	489	6.09%
6.5.5	487	6.07%
6.5	365	4.55%
5.0.11	342	4.26%
6.5.2	338	4.21%
7.0.2	278	3.46%
5.0.12	229	2.85%
7.0.1FP1	226	2.82%
5.0.8	182	2.27%
5.0.10	173	2.15%
6.5.4FP2	171	2.13%
5.0.13a	154	1.92%
6.0.2CF1	144	1.79%
6.5.5FP1	137	1.71%
6.5.4FP1	133	1.66%
6.0.3	131	1.63%
6.5.4FP3	117	1.46%
6.0	114	1.42%
5.0.9	96	1.20%
6.5.3FP1	91	1.13%
5.0.5	90	1.12%
Other	653	8.13%
CommuniGate Pro (5,252 servers)
Version	Number of Servers	Percent
4.1.8	796	15.16%
4.2.10	528	10.05%
5.0.9	461	8.78%
4.2.4	246	4.68%
5.0.8	190	3.62%
4.2.8	176	3.35%
5.0.11	170	3.24%
4.2	158	3.01%
5.1.1	145	2.76%
4.2.9	133	2.53%
4.0.6	126	2.40%
4.3.8	122	2.32%
4.2.7	118	2.25%
4.3.6	115	2.19%
5.1	112	2.13%
5.0.10	105	2.00%
5.0.6	90	1.71%
4.0.1	89	1.69%
3.5.9	87	1.66%
4.3.4	62	1.18%
5.1.2	61	1.16%
4.2.3	61	1.16%
5.0.12	59	1.12%
4.2.6	56	1.07%
Other	986	18.77%
Trend Micro (4,548 servers)
Version	Number of Servers	Percent
5.5	2,738	60.20%
5.7	1,376	30.26%
5.18	365	8.03%
Other	69	1.52%
GroupWise (4,384 servers)
Version	Number of Servers	Percent
7.0.1	1,034	23.59%
6.5.4	682	15.56%
7.0	347	7.92%
6.0.4	335	7.64%
6.5.5	323	7.37%
6.5.6	302	6.89%
6.5.1	256	5.84%
6.5.7	195	4.45%
6.5.3	158	3.60%
6.5.2	154	3.51%
6.0.2	114	2.60%
6.0.3	100	2.28%
5.5.5	92	2.10%
6.5.0	92	2.10%
6.0.1	74	1.69%
Other	126	2.87%
WinWebMail (3,820 servers)
Version	Number of Servers	Percent
3.7.1.1	1,358	35.55%
3.6.3.1	936	24.50%
3.7.0.5	580	15.18%
3.7.0.7	492	12.88%
3.7.0.3	380	9.95%
Other	74	1.94%
Kerio (3,658 servers)
Version	Number of Servers	Percent
6.2.2	781	21.35%
6.2.0	392	10.72%
6.1.3	272	7.44%
6.1.4	257	7.03%
6.1.2	239	6.53%
6.1.0	205	5.60%
6.3.0	170	4.65%
6.0.10	160	4.37%
6.2.1	136	3.72%
6.1.1	128	3.50%
6.0.3	106	2.90%
6.2.3	102	2.79%
6.0.8	78	2.13%
5.7.10	71	1.94%
6.0.9	60	1.64%
6.0.6	59	1.61%
6.0.7	49	1.34%
5.7.9	40	1.09%
Other	353	9.65%
ArGoSoft (3,021 servers)
Version	Number of Servers	Percent
1.8 (1.8.8.8)	782	25.89%
1.8 (1.8.8.7)	737	24.40%
1.8 (1.8.8.1)	138	4.57%
1.8 (1.8.6.0)	107	3.54%
1.8 (1.8.8.2)	89	2.95%
1.8 (1.8.8.3)	81	2.68%
1.8 (1.8.8.5)	81	2.68%
1.8 (1.8.8.4)	76	2.52%
1.8 (1.8.7.5)	65	2.15%
1.8 (1.8.8.9	63	2.09%
1.8 (1.8.8.6)	56	1.85%
1.8 (1.8.5.9)	53	1.75%
1.8 (1.8.6.6)	45	1.49%
1.8 (1.8.7.3)	38	1.26%
1.8 (1.8.7.6)	35	1.16%
Other	575	19.03%
XMail (2,253 servers)
Version	Number of Servers	Percent
1.22	1,005	44.61%
1.21	480	21.30%
1.20	234	10.39%
1.17	189	8.39%
1.12	76	3.37%
1.18	70	3.11%
1.16	41	1.82%
1.10	36	1.60%
1.11	28	1.24%
1.15	28	1.24%
Other	66	2.93%
Gordano Messaging Suite (GMS) (1,617 servers)
Version	Number of Servers	Percent
Other	1,617	100.00%
SurgeSMTP (1,580 servers)
Version	Number of Servers	Percent
3.7b8-8	626	39.62%
3.6f5-5	179	11.33%
3.8b-1	116	7.34%
3.5b3-3	94	5.95%
3.0c2-2	92	5.82%
3.7b6-6	62	3.92%
3.8a-8	38	2.41%
2.1c7-7	33	2.09%
3.8f-1	25	1.58%
2.0g2-1	25	1.58%
3.6f3-3	21	1.33%
2.2c10-10	18	1.14%
1.6e2	17	1.08%
1.9b-1	16	1.01%
1.8g3	16	1.01%
Other	202	12.78%
NetIQ MailMarshal (1,560 servers)
Version	Number of Servers	Percent
6.0.3.8	1,097	70.32%
5.5.6.7	144	9.23%
6.1.3.15	78	5.00%
5.5.4.16	46	2.95%
5.5.5.9	41	2.63%
5.5.6.6	34	2.18%
5.5.6.5	31	1.99%
5.5.5.6	23	1.47%
5.5.4.17	16	1.03%
Other	50	3.21%
Interscan (1,211 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	289	23.86%
3.81-Build_1022	150	12.39%
3.53 (build 2011)	111	9.17%
3.55 (build 1029)	109	9.00%
3.8-Build_3013	107	8.84%
3.53 (build 2017)	77	6.36%
3.53 (build 2013)	68	5.62%
3.55 (build 1020)	46	3.80%
3.52 (build 1375)	42	3.47%
3.53 (build 1493)	32	2.64%
3.8-Build_1080	21	1.73%
3.81-Build_1084	16	1.32%
3.8-Build_3065	13	1.07%
3.55 (build 1018)	13	1.07%
3.81-Build_1032	13	1.07%
Other	104	8.59%
InterScan VirusWall (1,206 servers)
Version	Number of Servers	Percent
Other	1,206	100.00%
Post.Office (1,157 servers)
Version	Number of Servers	Percent
3.5.3	457	39.50%
3.5.3J	110	9.51%
3.6.3	67	5.79%
3.8.3	60	5.19%
3.6.2	42	3.63%
3.1.2	38	3.28%
3.1.2J	38	3.28%
3.9.1	33	2.85%
4.0.1	28	2.42%
3.5.2	26	2.25%
3.9.2	23	1.99%
3.8.4	22	1.90%
3.9.0	21	1.82%
4.0.0.2	17	1.47%
4.0.0.1	16	1.38%
3.6.0	15	1.30%
3.8.7.4	13	1.12%
3.5.1	13	1.12%
3.5	13	1.12%
3.9.1.3	12	1.04%
3.1	12	1.04%
3.6	12	1.04%
Other	69	5.96%
Qmail Toaster (1,042 servers)
Version	Number of Servers	Percent
1.2	569	54.61%
1.3	345	33.11%
1.0	126	12.09%
Other	2	0.19%
ModusMail (971 servers)
Version	Number of Servers	Percent
4.35.480.0	681	70.13%
4.35.477.0	34	3.50%
4.1.361.21	30	3.09%
3.2.315.0	29	2.99%
4.2.425.16	27	2.78%
3.1.302.0	27	2.78%
4.35.480.11	24	2.47%
4.2.425.22	24	2.47%
4.1.361.0	15	1.54%
4.3.459.0	14	1.44%
3.1.297.0	12	1.24%
4.2.425.4	10	1.03%
Other	44	4.53%
VisNetic (709 servers)
Version	Number of Servers	Percent
7.2.4.1	71	10.01%
8.5.0.8	60	8.46%
8.0.3.0	58	8.18%
8.3.5.0	55	7.76%
5.0.2.3	45	6.35%
6.2.2.0	44	6.21%
5.8.6.6	42	5.92%
8.5.0.5	42	5.92%
7.6.1.0	40	5.64%
8.3.6	38	5.36%
8.0.3.1	35	4.94%
5.5.8.3	29	4.09%
7.5.3.0	20	2.82%
5.4.5.4	19	2.68%
5.3.5.0	18	2.54%
8.0.3	16	2.26%
8.3.0.1	12	1.69%
5.8.6.4	8	1.13%
6.0.9.0	8	1.13%
7.2.4.0	8	1.13%
Other	41	5.78%
Mirapoint (470 servers)
Version	Number of Servers	Percent
3.7.5a-GA	82	17.45%
3.7.3a-GA	60	12.77%
3.8.2-GA	55	11.70%
3.7.4b-GA	47	10.00%
3.7.5-GA	34	7.23%
3.7.2-GA	24	5.11%
3.5.8-GR	20	4.26%
3.7.1-GA	19	4.04%
3.8.0-FCS	15	3.19%
3.8.1-FCS	13	2.77%
1.1.0	11	2.34%
3.7.0-GA	11	2.34%
3.7.3-GA	8	1.70%
3.5.9-GR	7	1.49%
3.6.4-CR	7	1.49%
3.6.6-GR	7	1.49%
3.6.5-GR	7	1.49%
3.4.5-GR	5	1.06%
Other	38	8.09%
Mercury (347 servers)
Version	Number of Servers	Percent
1.48	151	43.52%
3.32	123	35.45%
3.21c	27	7.78%
3.31	19	5.48%
1.44	9	2.59%
1.47	8	2.31%
3.01a	5	1.44%
Other	5	1.44%
MAILsweeper (345 servers)
Version	Number of Servers	Percent
4.3.17.0	57	16.52%
4.3.12.0	55	15.94%
4.3.19.0	53	15.36%
4.3.14.0	50	14.49%
4.3.20.0	39	11.30%
4.2.10.0	20	5.80%
4.3.1.0	17	4.93%
4.3.10.0	16	4.64%
4.2.5.0	13	3.77%
4.2.1.0	12	3.48%
4.3.6.0	10	2.90%
Other	3	0.87%
WebSTAR V (339 servers)
Version	Number of Servers	Percent
5.4.0	99	29.20%
5.4.1	96	28.32%
5.3.4	76	22.42%
5.3.3	31	9.14%
5.3.2	20	5.90%
5.3.0	10	2.95%
5.3.1	5	1.47%
Other	2	0.59%
MagicMail (181 servers)
Version	Number of Servers	Percent
Other	181	100.00%
MessageWall (157 servers)
Version	Number of Servers	Percent
1.0.8	123	78.34%
1.0.11	17	10.83%
1.1.23	7	4.46%
1.0.6	4	2.55%
1.1.0	3	1.91%
Other	3	1.91%
WebSTAR (147 servers)
Version	Number of Servers	Percent
Other	147	100.00%
Neon Mail Server (135 servers)
Version	Number of Servers	Percent
3.0.7	59	43.70%
3.0.9	57	42.22%
3.0.8	8	5.93%
3.0.6	7	5.19%
3.0.4	2	1.48%
Other	2	1.48%
OpenVMS (34 servers)
Version	Number of Servers	Percent
7.3	13	38.24%
8.2	10	29.41%
7.2	8	23.53%
6.1	2	5.88%
8.3	1	2.94%
Other	0	0.00%