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	1,594,604	100.0%
Number of Servers that didn't respond	208,071	13.05%
Server didn't open socket	201,457	12.63%
Server didn't provide banner	6,614	0.41%
Server provided banner	1,386,533	86.95%
Server banner identifies software in use	889,146	55.76%

As indicated by the above table, of the 1,594,604 servers queried, only 889,146 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	312,271	35.12%
Microsoft	178,657	20.09%
Exim	142,879	16.07%
Postfix	105,051	11.81%
IMail	51,201	5.76%
MDaemon	20,585	2.32%
MailEnable	15,965	1.80%
Lotus Domino	9,444	1.06%
Merak	8,482	0.95%
CommuniGate Pro	5,771	0.65%
GroupWise	5,288	0.59%
Trend Micro	4,717	0.53%
Kerio	3,444	0.39%
WinWebMail	3,444	0.39%
ArGoSoft	3,288	0.37%
NetIQ MailMarshal	2,487	0.28%
XMail	2,228	0.25%
Gordano Messaging Suite (GMS)	1,969	0.22%
Interscan	1,902	0.21%
Post.Office	1,566	0.18%
SurgeSMTP	1,541	0.17%
InterScan VirusWall	1,362	0.15%
ModusMail	1,361	0.15%
Qmail Toaster	818	0.09%
VisNetic	775	0.09%
MAILsweeper	627	0.07%
Mercury	474	0.05%
WebSTAR V	427	0.05%
Mirapoint	420	0.05%
MessageWall	215	0.02%
WebSTAR	214	0.02%
Neon Mail Server	148	0.02%
MagicMail	87	0.01%
OpenVMS	38	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Sendmail (312,271 servers)
Version	Number of Servers	Percent
8.13.6	94,072	30.13%
8.11.6	54,491	17.45%
8.12.10	33,582	10.75%
8.12.11.20060308	23,553	7.54%
8.12.11	17,996	5.76%
8.13.1	17,489	5.60%
8.12.8	14,485	4.64%
8.13.4	12,111	3.88%
8.10.2	10,316	3.30%
8.9.3	9,278	2.97%
8.13.3	3,950	1.26%
8.12.9	3,833	1.23%
Other	17,115	5.48%
Microsoft (178,657 servers)
Version	Number of Servers	Percent
6.0.3790.1830	89,621	50.16%
5.0.2195.6713	47,535	26.61%
6.0.3790.211	25,374	14.20%
5.5.2653.13	4,790	2.68%
6.0.3790.0	4,335	2.43%
5.0.2195.5329	1,798	1.01%
Other	5,204	2.91%
Exim (142,879 servers)
Version	Number of Servers	Percent
4.52	103,176	72.21%
4.50	10,473	7.33%
4.60	5,838	4.09%
4.44	3,737	2.62%
4.61	2,837	1.99%
4.43	2,567	1.80%
3.36	2,196	1.54%
3.35	1,871	1.31%
4.42	1,676	1.17%
4.54	1,530	1.07%
Other	6,978	4.88%
Postfix (105,051 servers)
Version	Number of Servers	Percent
Other	105,051	100.00%
IMail (51,201 servers)
Version	Number of Servers	Percent
8.15	14,912	29.12%
8.05	6,338	12.38%
6.06	6,275	12.26%
8.22	4,333	8.46%
8.21	3,846	7.51%
7.15	2,149	4.20%
7.07	2,094	4.09%
8.20	1,266	2.47%
9.03	1,138	2.22%
8.10	871	1.70%
8.14	751	1.47%
8.00	745	1.46%
8.13	595	1.16%
8.12	579	1.13%
8.02	560	1.09%
Other	4,749	9.28%
MDaemon (20,585 servers)
Version	Number of Servers	Percent
8.1.3	3,073	14.93%
9.0.0	2,344	11.39%
8.1.4	1,876	9.11%
6.8.5	1,425	6.92%
7.2.3	1,210	5.88%
7.2.0	1,099	5.34%
8.1.5	943	4.58%
9.0.1	938	4.56%
8.0.2	789	3.83%
8.1.1	686	3.33%
8.0.3	626	3.04%
7.1.0	517	2.51%
7.1.2	513	2.49%
7.2.2	503	2.44%
6.8.4	464	2.25%
7.2.1	429	2.08%
7.0.1	420	2.04%
8.0.1	407	1.98%
8.1.2	237	1.15%
Other	2,086	10.13%
MailEnable (15,965 servers)
Version	Number of Servers	Percent
1.8--	3,446	21.58%
1.9--	1,924	12.05%
0-1.75-	1,426	8.93%
0-1.54-	1,016	6.36%
1.95--	894	5.60%
0-1.6-	812	5.09%
0-1.72-	570	3.57%
1.73--	512	3.21%
0-1.71-	476	2.98%
1.91--	470	2.94%
1.92--	448	2.81%
1.71--	371	2.32%
0--1.23	356	2.23%
0--1.1	287	1.80%
0-1.7-	189	1.18%
0--1.2	187	1.17%
1.72--	186	1.17%
Other	2,395	15.00%
Lotus Domino (9,444 servers)
Version	Number of Servers	Percent
6.5.4	1,094	11.58%
6.5.1	1,034	10.95%
6.5.3	776	8.22%
6.5	563	5.96%
7.0	539	5.71%
5.0.11	505	5.35%
6.5.2	474	5.02%
7.0.1	472	5.00%
6.5.5	441	4.67%
5.0.12	346	3.66%
6.5.4FP2	298	3.16%
5.0.8	286	3.03%
5.0.10	253	2.68%
6.5.4FP1	227	2.40%
5.0.13a	220	2.33%
6.0.3	211	2.23%
6.0.2CF1	200	2.12%
6.0	152	1.61%
5.0.9	140	1.48%
6.5.3FP1	116	1.23%
5.0.5	113	1.20%
6.0.1	108	1.14%
5.0.6a	103	1.09%
Other	773	8.19%
Merak (8,482 servers)
Version	Number of Servers	Percent
8.3.8	2,095	24.70%
8.0.3	1,821	21.47%
7.4.5	551	6.50%
7.6.4	403	4.75%
8.2.4	395	4.66%
7.5.2	387	4.56%
7.4.2	272	3.21%
8.3.0	236	2.78%
7.2.0	225	2.65%
6.2.1	170	2.00%
4.4.2	137	1.62%
7.4.0	137	1.62%
8.3.6	127	1.50%
7.6.1	108	1.27%
5.9.4	100	1.18%
5.5.7	98	1.16%
5.8.6	90	1.06%
7.0.1	86	1.01%
Other	1,044	12.31%
CommuniGate Pro (5,771 servers)
Version	Number of Servers	Percent
4.1.8	985	17.07%
4.2.10	578	10.02%
5.0.9	334	5.79%
5.0.8	325	5.63%
4.2.4	261	4.52%
4.2.8	227	3.93%
4.2	212	3.67%
4.3.8	209	3.62%
4.2.9	187	3.24%
4.2.7	174	3.02%
4.3.6	154	2.67%
5.0.6	152	2.63%
4.0.6	151	2.62%
3.5.9	121	2.10%
4.0.1	97	1.68%
4.3.7	94	1.63%
4.3.9	90	1.56%
5.0.1	84	1.46%
5.0.7	83	1.44%
4.3.4	83	1.44%
4.2.6	82	1.42%
4.2.5	76	1.32%
4.2.3	74	1.28%
5.0.2	69	1.20%
4.1.3	66	1.14%
4.1.6	63	1.09%
4.0.5	61	1.06%
Other	679	11.77%
GroupWise (5,288 servers)
Version	Number of Servers	Percent
6.5.4	1,192	22.54%
7.0	759	14.35%
6.5.5	566	10.70%
6.0.4	505	9.55%
6.5.1	415	7.85%
6.5.2	268	5.07%
6.5.3	260	4.92%
6.5.6	209	3.95%
6.0.2	189	3.57%
6.0.3	170	3.21%
6.5.0	160	3.03%
5.5.5	153	2.89%
6.0.1	104	1.97%
7.0.1	96	1.82%
5.5.4	57	1.08%
Other	185	3.50%
Trend Micro (4,717 servers)
Version	Number of Servers	Percent
5.5	3,581	75.92%
5.7	604	12.80%
5.18	436	9.24%
5.15	65	1.38%
Other	31	0.66%
Kerio (3,444 servers)
Version	Number of Servers	Percent
6.1.3	1,020	29.62%
6.1.2	514	14.92%
6.1.0	322	9.35%
6.1.1	228	6.62%
6.0.10	214	6.21%
6.0.3	133	3.86%
6.0.8	107	3.11%
5.7.10	94	2.73%
6.0.6	81	2.35%
6.0.9	79	2.29%
6.0.7	67	1.95%
6.1.4	59	1.71%
6.0.1	46	1.34%
5.7.9	46	1.34%
5.7.4	46	1.34%
6.0.4	42	1.22%
6.0.5	40	1.16%
6.0.0	35	1.02%
Other	271	7.87%
WinWebMail (3,444 servers)
Version	Number of Servers	Percent
3.6.3.1	1,313	38.12%
3.7.0.5	744	21.60%
3.7.0.7	731	21.23%
3.7.0.3	473	13.73%
3.7.1.1	123	3.57%
3.7.0.1	46	1.34%
Other	14	0.41%
ArGoSoft (3,288 servers)
Version	Number of Servers	Percent
1.8 (1.8.8.7)	858	26.09%
1.8 (1.8.8.1)	246	7.48%
1.8 (1.8.8.5)	184	5.60%
1.8 (1.8.8.3)	179	5.44%
1.8 (1.8.6.0)	166	5.05%
1.8 (1.8.8.2)	148	4.50%
1.8 (1.8.8.4)	145	4.41%
1.8 (1.8.8.6)	144	4.38%
1.8 (1.8.7.5)	109	3.32%
1.8 (1.8.5.9)	75	2.28%
1.8 (1.8.7.6)	64	1.95%
1.8 (1.8.6.6)	59	1.79%
1.8 (1.8.7.3)	58	1.76%
1.8 (1.8.7.7)	48	1.46%
1.8 (1.8.8.0)	44	1.34%
1.8 (1.8.3.6)	36	1.09%
1.8 (1.8.7.1)	36	1.09%
1.8 (1.8.4.7)	34	1.03%
Other	655	19.92%
NetIQ MailMarshal (2,487 servers)
Version	Number of Servers	Percent
6.0.3.8	1,740	69.96%
5.5.6.7	224	9.01%
6.1.3.15	131	5.27%
5.5.5.9	74	2.98%
5.5.4.16	69	2.77%
5.5.6.6	58	2.33%
5.5.6.5	49	1.97%
5.5.5.6	33	1.33%
5.5.4.17	32	1.29%
Other	77	3.10%
XMail (2,228 servers)
Version	Number of Servers	Percent
1.22	649	29.13%
1.21	609	27.33%
1.20	330	14.81%
1.17	241	10.82%
1.18	96	4.31%
1.12	69	3.10%
1.16	50	2.24%
1.10	46	2.06%
1.11	37	1.66%
1.15	33	1.48%
Other	68	3.05%
Gordano Messaging Suite (GMS) (1,969 servers)
Version	Number of Servers	Percent
Other	1,969	100.00%
Interscan (1,902 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	486	25.55%
3.81-Build_1022	210	11.04%
3.53 (build 2011)	197	10.36%
3.55 (build 1029)	153	8.04%
3.8-Build_3013	144	7.57%
3.53 (build 2017)	137	7.20%
3.53 (build 2013)	103	5.42%
3.52 (build 1375)	77	4.05%
3.55 (build 1020)	55	2.89%
3.53 (build 1493)	52	2.73%
3.8-Build_1080	41	2.16%
3.81-Build_1055	22	1.16%
3.55 (build 1018)	22	1.16%
3.81-Build_1032	20	1.05%
Other	183	9.62%
Post.Office (1,566 servers)
Version	Number of Servers	Percent
3.5.3	641	40.93%
3.5.3J	152	9.71%
3.8.3	80	5.11%
3.6.3	67	4.28%
3.6.2	67	4.28%
3.1.2J	57	3.64%
3.1.2	55	3.51%
3.9.1	46	2.94%
3.5.2	44	2.81%
3.8.4	40	2.55%
3.9.2	32	2.04%
3.9.0	30	1.92%
3.6.0	29	1.85%
3.6	27	1.72%
4.0.0.2	24	1.53%
3.9.1.3	16	1.02%
4.0.0.1	16	1.02%
Other	143	9.13%
SurgeSMTP (1,541 servers)
Version	Number of Servers	Percent
3.6f5-5	590	38.29%
3.0c2-2	158	10.25%
3.5b3-3	155	10.06%
3.7b3-3	107	6.94%
2.1c7-7	49	3.18%
3.7c-3	35	2.27%
3.7b5-5	31	2.01%
2.2c10-10	29	1.88%
3.7a-15	27	1.75%
1.6e2	27	1.75%
2.0g2-1	25	1.62%
3.7b-2	25	1.62%
3.6f3-3	24	1.56%
1.8g3	22	1.43%
3.7c-14	20	1.30%
Other	217	14.08%
InterScan VirusWall (1,362 servers)
Version	Number of Servers	Percent
Other	1,362	100.00%
ModusMail (1,361 servers)
Version	Number of Servers	Percent
4.3.459.0	583	42.84%
4.2.425.22	173	12.71%
4.1.361.21	153	11.24%
4.2.425.4	96	7.05%
4.2.425.16	75	5.51%
3.2.315.0	58	4.26%
4.2.407.0	32	2.35%
4.1.361.0	29	2.13%
3.1.302.0	27	1.98%
4.0.340.0	18	1.32%
3.1.297.0	17	1.25%
4.2.420.0	14	1.03%
Other	86	6.32%
Qmail Toaster (818 servers)
Version	Number of Servers	Percent
1.2	645	78.85%
1.0	171	20.90%
Other	2	0.24%
VisNetic (775 servers)
Version	Number of Servers	Percent
8.3.5.0	99	12.77%
8.0.3.0	70	9.03%
7.2.4.1	68	8.77%
5.8.6.6	62	8.00%
7.6.1.0	59	7.61%
5.0.2.3	50	6.45%
8.0.3.1	49	6.32%
6.2.2.0	47	6.06%
8.3.6	34	4.39%
5.5.8.3	27	3.48%
8.0.3	25	3.23%
7.5.3.0	25	3.23%
5.4.5.4	24	3.10%
8.3.0.1	20	2.58%
5.8.6.4	18	2.32%
5.3.5.0	16	2.06%
5.0.1	12	1.55%
6.0.9.0	12	1.55%
5.0.2.1	10	1.29%
7.2.4.0	9	1.16%
Other	39	5.03%
MAILsweeper (627 servers)
Version	Number of Servers	Percent
4.3.19.0	120	19.14%
4.3.12.0	117	18.66%
4.3.14.0	112	17.86%
4.3.17.0	102	16.27%
4.2.10.0	40	6.38%
4.3.1.0	35	5.58%
4.2.5.0	26	4.15%
4.3.10.0	25	3.99%
4.3.6.0	21	3.35%
4.2.1.0	18	2.87%
Other	11	1.75%
Mercury (474 servers)
Version	Number of Servers	Percent
1.48	210	44.30%
3.32	162	34.18%
3.21c	38	8.02%
3.31	23	4.85%
1.44	15	3.16%
1.47	10	2.11%
3.01a	8	1.69%
Other	8	1.69%
WebSTAR V (427 servers)
Version	Number of Servers	Percent
5.4.0	129	30.21%
5.4.1	114	26.70%
5.3.4	94	22.01%
5.3.3	38	8.90%
5.3.2	29	6.79%
5.3.0	11	2.58%
5.2.4	6	1.41%
5.3.1	5	1.17%
Other	1	0.23%
Mirapoint (420 servers)
Version	Number of Servers	Percent
3.7.3a-GA	62	14.76%
3.7.4b-GA	45	10.71%
3.7.2-GA	43	10.24%
3.7.1-GA	40	9.52%
3.7.5-GA	36	8.57%
3.5.8-GR	36	8.57%
3.5.9-GR	17	4.05%
3.7.0-GA	17	4.05%
3.7.3-GA	16	3.81%
3.6.5-GR	13	3.10%
3.6.4-CR	12	2.86%
1.1.0	10	2.38%
3.6.6-GR	9	2.14%
3.5.7-GR	7	1.67%
3.5.3-GR	6	1.43%
3.4.6-GR	5	1.19%
3.5.6-GR	5	1.19%
Other	41	9.76%
MessageWall (215 servers)
Version	Number of Servers	Percent
1.0.8	180	83.72%
1.0.9	14	6.51%
1.1.23	7	3.26%
1.1.0	6	2.79%
1.0.6	5	2.33%
Other	3	1.40%
WebSTAR (214 servers)
Version	Number of Servers	Percent
Other	214	100.00%
Neon Mail Server (148 servers)
Version	Number of Servers	Percent
3.0.7	88	59.46%
3.0.9	24	16.22%
3.0.8	19	12.84%
3.0.6	11	7.43%
3.0.4	3	2.03%
3.0.5	3	2.03%
Other	0	0.00%
MagicMail (87 servers)
Version	Number of Servers	Percent
Other	87	100.00%
OpenVMS (38 servers)
Version	Number of Servers	Percent
7.3	15	39.47%
8.2	10	26.32%
7.2	9	23.68%
6.1	2	5.26%
7.1	2	5.26%
Other	0	0.00%