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	1,660,131	100.0%
Number of Servers that didn't respond	233,216	14.05%
Server didn't open socket	225,154	13.56%
Server didn't provide banner	8,062	0.49%
Server provided banner	1,426,915	85.95%
Server banner identifies software in use	905,784	54.56%

As indicated by the above table, of the 1,660,131 servers queried, only 905,784 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	297,343	32.83%
Microsoft	187,955	20.75%
Exim	158,381	17.49%
Postfix	115,219	12.72%
IMail	46,791	5.17%
MDaemon	21,071	2.33%
MailEnable	18,169	2.01%
Lotus Domino	8,870	0.98%
Merak	8,612	0.95%
CommuniGate Pro	5,574	0.62%
Trend Micro	4,813	0.53%
GroupWise	4,741	0.52%
WinWebMail	4,032	0.45%
Kerio	3,858	0.43%
ArGoSoft	3,205	0.35%
XMail	2,383	0.26%
Gordano Messaging Suite (GMS)	1,794	0.20%
NetIQ MailMarshal	1,746	0.19%
SurgeSMTP	1,681	0.19%
Interscan	1,461	0.16%
Post.Office	1,377	0.15%
InterScan VirusWall	1,326	0.15%
ModusMail	1,280	0.14%
Qmail Toaster	1,028	0.11%
VisNetic	755	0.08%
Mirapoint	488	0.05%
MAILsweeper	416	0.05%
Mercury	387	0.04%
WebSTAR V	360	0.04%
WebSTAR	173	0.02%
MessageWall	170	0.02%
Neon Mail Server	158	0.02%
MagicMail	132	0.01%
OpenVMS	35	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Sendmail (297,343 servers)
Version	Number of Servers	Percent
8.12.11.20060614	52,336	17.60%
8.11.6	44,424	14.94%
8.12.11.20060308	29,951	10.07%
8.13.6	28,917	9.73%
8.12.10	24,788	8.34%
8.13.1	19,404	6.53%
8.12.11	15,045	5.06%
8.13.4	12,172	4.09%
8.12.8	11,693	3.93%
8.13.6.20060614	9,069	3.05%
8.10.2	8,287	2.79%
8.9.3	7,503	2.52%
8.13.7	7,087	2.38%
8.13.8	6,520	2.19%
8.13.3	3,431	1.15%
8.12.9	3,134	1.05%
Other	13,582	4.57%
Microsoft (187,955 servers)
Version	Number of Servers	Percent
6.0.3790.1830	114,795	61.08%
5.0.2195.6713	40,134	21.35%
6.0.3790.211	20,856	11.10%
5.5.2653.13	3,403	1.81%
6.0.3790.0	3,279	1.74%
Other	5,488	2.92%
Exim (158,381 servers)
Version	Number of Servers	Percent
4.52	116,105	73.31%
4.50	10,408	6.57%
4.60	6,664	4.21%
4.63	4,802	3.03%
4.62	3,604	2.28%
4.44	3,112	1.96%
3.36	1,993	1.26%
Other	11,693	7.38%
Postfix (115,219 servers)
Version	Number of Servers	Percent
Other	115,219	100.00%
IMail (46,791 servers)
Version	Number of Servers	Percent
8.15	12,895	27.56%
8.22	5,736	12.26%
6.06	5,643	12.06%
8.05	5,086	10.87%
9.10	2,176	4.65%
8.21	1,997	4.27%
7.15	1,935	4.14%
7.07	1,712	3.66%
9.04	1,324	2.83%
8.20	996	2.13%
8.00	728	1.56%
8.10	705	1.51%
8.14	605	1.29%
8.12	559	1.19%
Other	4,694	10.03%
MDaemon (21,071 servers)
Version	Number of Servers	Percent
9.0.7	2,204	10.46%
8.1.3	2,047	9.71%
9.0.6	1,834	8.70%
9.0.4	1,539	7.30%
6.8.5	1,210	5.74%
8.1.4	993	4.71%
7.2.3	974	4.62%
9.0.1	928	4.40%
7.2.0	883	4.19%
9.0.5	772	3.66%
9.0.0	704	3.34%
8.0.2	663	3.15%
8.0.3	532	2.52%
8.1.1	532	2.52%
8.1.5	518	2.46%
7.1.2	449	2.13%
7.1.0	421	2.00%
7.2.2	414	1.96%
6.8.4	375	1.78%
7.2.1	352	1.67%
8.0.1	346	1.64%
7.0.1	337	1.60%
Other	2,044	9.70%
MailEnable (18,169 servers)
Version	Number of Servers	Percent
1.8--	2,807	15.45%
1.9--	2,391	13.16%
1.96--	1,648	9.07%
1.95--	1,596	8.78%
0-1.75-	889	4.89%
0-1.79-	745	4.10%
0-1.54-	715	3.94%
0-1.6-	608	3.35%
0-2.2-	539	2.97%
0-2.11-	445	2.45%
1.73--	431	2.37%
0--2.2	407	2.24%
0-1.71-	320	1.76%
0-1.72-	295	1.62%
1.91--	293	1.61%
1.71--	288	1.59%
1.92--	256	1.41%
0--2.11	187	1.03%
Other	3,309	18.21%
Lotus Domino (8,870 servers)
Version	Number of Servers	Percent
6.5.4	926	10.44%
6.5.1	853	9.62%
7.0.1	782	8.82%
6.5.3	652	7.35%
7.0	571	6.44%
6.5.5	521	5.87%
6.5	435	4.90%
6.5.2	396	4.46%
5.0.11	393	4.43%
5.0.12	281	3.17%
7.0.1FP1	261	2.94%
5.0.8	222	2.50%
6.5.4FP2	205	2.31%
5.0.10	198	2.23%
5.0.13a	168	1.89%
6.0.2CF1	161	1.82%
6.5.4FP1	160	1.80%
6.5.5FP1	149	1.68%
6.0.3	147	1.66%
6.0	136	1.53%
6.5.4FP3	119	1.34%
7.0.2	116	1.31%
5.0.9	113	1.27%
6.5.3FP1	96	1.08%
5.0.5	94	1.06%
Other	715	8.06%
Merak (8,612 servers)
Version	Number of Servers	Percent
8.5.0	2,143	24.88%
8.0.3	1,890	21.95%
8.3.8	748	8.69%
7.4.5	473	5.49%
7.6.4	371	4.31%
7.5.2	354	4.11%
8.2.4	256	2.97%
7.4.2	235	2.73%
7.2.0	201	2.33%
6.2.1	155	1.80%
8.3.0	137	1.59%
7.4.0	120	1.39%
4.4.2	111	1.29%
7.6.1	107	1.24%
5.5.7	87	1.01%
Other	1,224	14.21%
CommuniGate Pro (5,574 servers)
Version	Number of Servers	Percent
4.1.8	880	15.79%
5.0.9	594	10.66%
4.2.10	571	10.24%
4.2.4	231	4.14%
5.0.8	222	3.98%
4.2.8	189	3.39%
5.1	188	3.37%
5.0.11	186	3.34%
4.2	166	2.98%
4.3.8	152	2.73%
4.2.9	142	2.55%
4.0.6	139	2.49%
5.0.10	127	2.28%
4.2.7	127	2.28%
4.3.6	126	2.26%
3.5.9	101	1.81%
4.0.1	96	1.72%
5.0.6	95	1.70%
4.2.3	66	1.18%
4.3.4	65	1.17%
5.0.1	64	1.15%
5.0.7	62	1.11%
4.2.6	61	1.09%
Other	924	16.58%
Trend Micro (4,813 servers)
Version	Number of Servers	Percent
5.5	2,970	61.71%
5.7	1,294	26.89%
5.18	472	9.81%
5.15	52	1.08%
Other	25	0.52%
GroupWise (4,741 servers)
Version	Number of Servers	Percent
7.0.1	989	20.86%
6.5.4	779	16.43%
7.0	386	8.14%
6.0.4	384	8.10%
6.5.5	378	7.97%
6.5.6	319	6.73%
6.5.1	283	5.97%
6.5.7	188	3.97%
6.5.3	174	3.67%
6.5.2	171	3.61%
6.0.2	132	2.78%
6.0.3	113	2.38%
5.5.5	106	2.24%
6.5.0	104	2.19%
6.0.1	83	1.75%
Other	152	3.21%
WinWebMail (4,032 servers)
Version	Number of Servers	Percent
3.7.1.1	1,356	33.63%
3.6.3.1	1,021	25.32%
3.7.0.5	620	15.38%
3.7.0.7	563	13.96%
3.7.0.3	417	10.34%
Other	55	1.36%
Kerio (3,858 servers)
Version	Number of Servers	Percent
6.2.2	752	19.49%
6.2.0	492	12.75%
6.1.4	340	8.81%
6.1.3	333	8.63%
6.1.2	286	7.41%
6.1.0	229	5.94%
6.2.1	187	4.85%
6.0.10	178	4.61%
6.1.1	152	3.94%
6.0.3	117	3.03%
6.0.8	86	2.23%
6.0.6	71	1.84%
5.7.10	68	1.76%
6.0.9	65	1.68%
6.0.7	55	1.43%
5.7.9	41	1.06%
Other	406	10.52%
ArGoSoft (3,205 servers)
Version	Number of Servers	Percent
1.8 (1.8.8.7)	896	27.96%
1.8 (1.8.8.8)	658	20.53%
1.8 (1.8.8.1)	147	4.59%
1.8 (1.8.6.0)	123	3.84%
1.8 (1.8.8.3)	97	3.03%
1.8 (1.8.8.2)	97	3.03%
1.8 (1.8.8.5)	92	2.87%
1.8 (1.8.8.4)	83	2.59%
1.8 (1.8.7.5)	73	2.28%
1.8 (1.8.8.6)	66	2.06%
1.8 (1.8.5.9)	60	1.87%
1.8 (1.8.6.6)	49	1.53%
1.8 (1.8.8.9	46	1.44%
1.8 (1.8.7.3)	41	1.28%
1.8 (1.8.7.6)	41	1.28%
Other	636	19.84%
XMail (2,383 servers)
Version	Number of Servers	Percent
1.22	1,015	42.59%
1.21	542	22.74%
1.20	256	10.74%
1.17	217	9.11%
1.18	78	3.27%
1.12	71	2.98%
1.16	43	1.80%
1.10	38	1.59%
1.15	29	1.22%
1.11	27	1.13%
Other	67	2.81%
Gordano Messaging Suite (GMS) (1,794 servers)
Version	Number of Servers	Percent
Other	1,794	100.00%
NetIQ MailMarshal (1,746 servers)
Version	Number of Servers	Percent
6.0.3.8	1,219	69.82%
5.5.6.7	172	9.85%
6.1.3.15	88	5.04%
5.5.5.9	51	2.92%
5.5.4.16	49	2.81%
5.5.6.6	38	2.18%
5.5.6.5	33	1.89%
5.5.5.6	26	1.49%
5.5.4.17	18	1.03%
Other	52	2.98%
SurgeSMTP (1,681 servers)
Version	Number of Servers	Percent
3.7b8-8	631	37.54%
3.6f5-5	196	11.66%
3.8b-1	114	6.78%
3.5b3-3	109	6.48%
3.7b6-6	107	6.37%
3.0c2-2	98	5.83%
3.8a-8	40	2.38%
2.1c7-7	34	2.02%
2.0g2-1	24	1.43%
1.8g3	23	1.37%
1.6e2	23	1.37%
3.6f3-3	23	1.37%
2.2c10-10	19	1.13%
Other	240	14.28%
Interscan (1,461 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	348	23.82%
3.81-Build_1022	186	12.73%
3.53 (build 2011)	140	9.58%
3.55 (build 1029)	130	8.90%
3.8-Build_3013	123	8.42%
3.53 (build 2017)	110	7.53%
3.53 (build 2013)	76	5.20%
3.55 (build 1020)	57	3.90%
3.52 (build 1375)	52	3.56%
3.53 (build 1493)	36	2.46%
3.8-Build_1080	25	1.71%
3.8-Build_3065	15	1.03%
3.55 (build 1018)	15	1.03%
3.81-Build_1084	15	1.03%
Other	133	9.10%
Post.Office (1,377 servers)
Version	Number of Servers	Percent
3.5.3	506	36.75%
3.5.3J	142	10.31%
3.6.3	74	5.37%
3.8.3	73	5.30%
3.6.2	55	3.99%
3.1.2J	47	3.41%
3.9.1	42	3.05%
3.1.2	40	2.90%
3.8.4	35	2.54%
4.0.1	34	2.47%
3.5.2	31	2.25%
3.9.0	29	2.11%
3.9.2	29	2.11%
3.6.0	24	1.74%
4.0.0.2	20	1.45%
3.8.7.4	17	1.23%
4.0.0.1	17	1.23%
3.8.5	14	1.02%
3.9.1.3	14	1.02%
3.6	14	1.02%
Other	120	8.71%
InterScan VirusWall (1,326 servers)
Version	Number of Servers	Percent
Other	1,326	100.00%
ModusMail (1,280 servers)
Version	Number of Servers	Percent
4.35.480.0	925	72.27%
4.35.477.0	52	4.06%
4.1.361.21	39	3.05%
3.2.315.0	32	2.50%
4.2.425.16	31	2.42%
4.3.459.0	28	2.19%
3.1.302.0	26	2.03%
4.2.425.22	25	1.95%
4.35.480.11	20	1.56%
3.1.297.0	17	1.33%
4.1.361.0	16	1.25%
Other	69	5.39%
Qmail Toaster (1,028 servers)
Version	Number of Servers	Percent
1.2	590	57.39%
1.3	289	28.11%
1.0	147	14.30%
Other	2	0.19%
VisNetic (755 servers)
Version	Number of Servers	Percent
7.2.4.1	81	10.73%
8.0.3.0	60	7.95%
8.3.5.0	59	7.81%
8.5.0.8	56	7.42%
8.5.0.5	50	6.62%
5.8.6.6	46	6.09%
7.6.1.0	45	5.96%
5.0.2.3	45	5.96%
8.3.6	44	5.83%
6.2.2.0	43	5.70%
8.0.3.1	36	4.77%
5.5.8.3	32	4.24%
5.4.5.4	22	2.91%
7.5.3.0	21	2.78%
5.3.5.0	16	2.12%
8.0.3	15	1.99%
5.8.6.4	12	1.59%
8.3.0.1	12	1.59%
6.0.9.0	9	1.19%
7.2.4.0	8	1.06%
Other	43	5.70%
Mirapoint (488 servers)
Version	Number of Servers	Percent
3.7.5a-GA	77	15.78%
3.7.3a-GA	69	14.14%
3.7.4b-GA	48	9.84%
3.7.5-GA	42	8.61%
3.7.2-GA	27	5.53%
3.8.2-GA	27	5.53%
3.5.8-GR	23	4.71%
3.8.1-FCS	22	4.51%
3.8.0-FCS	20	4.10%
3.7.1-GA	19	3.89%
3.7.0-GA	12	2.46%
1.1.0	11	2.25%
3.7.3-GA	9	1.84%
3.6.4-CR	9	1.84%
3.6.6-GR	9	1.84%
3.5.9-GR	9	1.84%
3.6.5-GR	8	1.64%
3.4.6-GR	5	1.02%
3.4.5-GR	5	1.02%
Other	37	7.58%
MAILsweeper (416 servers)
Version	Number of Servers	Percent
4.3.17.0	72	17.31%
4.3.12.0	71	17.07%
4.3.19.0	65	15.62%
4.3.14.0	64	15.38%
4.3.20.0	41	9.86%
4.2.10.0	22	5.29%
4.3.1.0	18	4.33%
4.3.10.0	16	3.85%
4.2.5.0	15	3.61%
4.3.6.0	14	3.37%
4.2.1.0	14	3.37%
Other	4	0.96%
Mercury (387 servers)
Version	Number of Servers	Percent
1.48	168	43.41%
3.32	133	34.37%
3.21c	28	7.24%
3.31	20	5.17%
1.44	15	3.88%
1.47	8	2.07%
3.01a	6	1.55%
Other	9	2.33%
WebSTAR V (360 servers)
Version	Number of Servers	Percent
5.4.1	103	28.61%
5.4.0	103	28.61%
5.3.4	84	23.33%
5.3.3	33	9.17%
5.3.2	19	5.28%
5.3.0	9	2.50%
5.3.1	6	1.67%
Other	3	0.83%
WebSTAR (173 servers)
Version	Number of Servers	Percent
Other	173	100.00%
MessageWall (170 servers)
Version	Number of Servers	Percent
1.0.8	133	78.24%
1.0.11	19	11.18%
1.1.23	7	4.12%
1.1.0	4	2.35%
1.0.6	3	1.76%
Other	4	2.35%
Neon Mail Server (158 servers)
Version	Number of Servers	Percent
3.0.7	74	46.84%
3.0.9	59	37.34%
3.0.8	11	6.96%
3.0.6	9	5.70%
3.0.4	2	1.27%
3.0.5	2	1.27%
Other	1	0.63%
MagicMail (132 servers)
Version	Number of Servers	Percent
Other	132	100.00%
OpenVMS (35 servers)
Version	Number of Servers	Percent
7.3	18	51.43%
8.2	10	28.57%
7.2	5	14.29%
6.1	2	5.71%
Other	0	0.00%