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	1,701,203	100.0%
Number of Servers that didn't respond	244,655	14.38%
Server didn't open socket	235,838	13.86%
Server didn't provide banner	8,817	0.52%
Server provided banner	1,456,548	85.62%
Server banner identifies software in use	904,407	53.16%

As indicated by the above table, of the 1,701,203 servers queried, only 904,407 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	281,497	31.13%
Microsoft	193,319	21.38%
Exim	170,543	18.86%
Postfix	125,311	13.86%
IMail	34,339	3.80%
MDaemon	21,766	2.41%
MailEnable	19,866	2.20%
Merak	8,645	0.96%
Lotus Domino	8,096	0.90%
CommuniGate Pro	5,180	0.57%
Trend Micro	4,842	0.54%
WinWebMail	4,368	0.48%
Kerio	4,324	0.48%
GroupWise	4,054	0.45%
ArGoSoft	3,099	0.34%
XMail	2,501	0.28%
SurgeSMTP	1,748	0.19%
Gordano Messaging Suite (GMS)	1,521	0.17%
Qmail Toaster	1,278	0.14%
NetIQ MailMarshal	1,271	0.14%
Post.Office	1,221	0.14%
InterScan VirusWall	1,199	0.13%
Interscan	1,041	0.12%
VisNetic	649	0.07%
ModusMail	598	0.07%
Mirapoint	546	0.06%
WebSTAR V	307	0.03%
Mercury	307	0.03%
MagicMail	265	0.03%
MAILsweeper	249	0.03%
Neon Mail Server	167	0.02%
WebSTAR	143	0.02%
MessageWall	114	0.01%
OpenVMS	33	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Sendmail (281,497 servers)
Version	Number of Servers	Percent
8.12.11.20060614	48,596	17.26%
8.12.11.20060308	35,673	12.67%
8.11.6	31,888	11.33%
8.13.6	28,324	10.06%
8.13.1	22,128	7.86%
8.12.10	21,444	7.62%
8.13.8	13,864	4.93%
8.12.11	12,936	4.60%
8.13.4	10,558	3.75%
8.13.6.20060614	9,708	3.45%
8.12.8	9,570	3.40%
8.10.2	6,203	2.20%
8.13.7	6,165	2.19%
8.9.3	6,146	2.18%
8.13.3	2,939	1.04%
Other	15,355	5.45%
Microsoft (193,319 servers)
Version	Number of Servers	Percent
6.0.3790.1830	134,926	69.79%
5.0.2195.6713	32,718	16.92%
6.0.3790.211	16,545	8.56%
6.0.3790.0	2,377	1.23%
5.5.2653.13	2,301	1.19%
Other	4,452	2.30%
Exim (170,543 servers)
Version	Number of Servers	Percent
4.63	114,937	67.39%
4.52	15,232	8.93%
4.50	10,639	6.24%
4.60	7,521	4.41%
4.62	3,949	2.32%
4.66	3,302	1.94%
4.44	2,878	1.69%
3.36	1,810	1.06%
Other	10,275	6.02%
Postfix (125,311 servers)
Version	Number of Servers	Percent
Other	125,311	100.00%
IMail (34,339 servers)
Version	Number of Servers	Percent
8.15	6,932	20.19%
8.22	5,947	17.32%
9.10	4,485	13.06%
8.05	4,483	13.06%
7.07	1,503	4.38%
7.15	1,412	4.11%
6.06	1,308	3.81%
8.21	1,291	3.76%
9.04	692	2.02%
8.00	644	1.88%
8.20	586	1.71%
8.02	415	1.21%
8.10	398	1.16%
8.12	386	1.12%
8.13	367	1.07%
8.01	351	1.02%
Other	3,139	9.14%
MDaemon (21,766 servers)
Version	Number of Servers	Percent
9.5.5	2,496	11.47%
9.5.6	1,694	7.78%
8.1.3	1,562	7.18%
9.5.4	1,525	7.01%
9.0.4	1,275	5.86%
6.8.5	971	4.46%
9.5.3	792	3.64%
7.2.3	791	3.63%
7.2.0	715	3.28%
9.0.1	673	3.09%
9.5.1	627	2.88%
8.1.4	617	2.83%
9.5.2	555	2.55%
9.0.0	546	2.51%
8.0.2	538	2.47%
9.0.6	529	2.43%
8.0.3	438	2.01%
8.1.1	434	1.99%
9.0.7	417	1.92%
7.1.2	385	1.77%
8.1.5	381	1.75%
7.1.0	322	1.48%
7.2.2	320	1.47%
6.8.4	283	1.30%
7.0.1	282	1.30%
7.2.1	281	1.29%
8.0.1	277	1.27%
9.0.5	275	1.26%
Other	1,765	8.11%
MailEnable (19,866 servers)
Version	Number of Servers	Percent
1.981--	2,873	14.46%
1.8--	1,909	9.61%
1.96--	1,905	9.59%
1.9--	1,873	9.43%
1.95--	1,664	8.38%
0-2.37-	1,006	5.06%
0-2.36-	984	4.95%
0-1.85-	914	4.60%
0--2.37	535	2.69%
0-1.841-	479	2.41%
0-1.6-	414	2.08%
0--2.36	405	2.04%
0-1.75-	331	1.67%
0-1.54-	312	1.57%
0-2.32-	269	1.35%
1.73--	254	1.28%
0-1.79-	203	1.02%
Other	3,536	17.80%
Merak (8,645 servers)
Version	Number of Servers	Percent
8.0.3	1,930	22.33%
8.9.1	1,776	20.54%
8.5.0	1,008	11.66%
8.3.8	445	5.15%
7.4.5	403	4.66%
7.5.2	327	3.78%
7.6.4	312	3.61%
8.9.0	245	2.83%
7.4.2	195	2.26%
8.2.4	178	2.06%
7.2.0	173	2.00%
6.2.1	126	1.46%
8.3.0	110	1.27%
7.4.0	102	1.18%
7.6.1	94	1.09%
Other	1,221	14.12%
Lotus Domino (8,096 servers)
Version	Number of Servers	Percent
7.0.2	809	9.99%
6.5.4	734	9.07%
7.0.1	687	8.49%
6.5.1	654	8.08%
6.5.3	534	6.60%
6.5.5	477	5.89%
7.0	419	5.18%
6.5	365	4.51%
5.0.11	291	3.59%
6.5.2	276	3.41%
7.0.2FP1	233	2.88%
5.0.12	215	2.66%
7.0.1FP1	181	2.24%
6.5.5FP2	168	2.08%
5.0.8	166	2.05%
5.0.10	146	1.80%
5.0.13a	137	1.69%
6.5.4FP2	128	1.58%
6.0.2CF1	124	1.53%
6.5.4FP3	114	1.41%
6.0.3	110	1.36%
6.0	108	1.33%
6.5.4FP1	97	1.20%
6.5.5FP1	96	1.19%
5.0.9	90	1.11%
Other	737	9.10%
CommuniGate Pro (5,180 servers)
Version	Number of Servers	Percent
4.1.8	719	13.88%
4.2.10	517	9.98%
5.0.9	331	6.39%
5.1.7	194	3.75%
5.1.5	179	3.46%
5.1.3	152	2.93%
5.0.8	147	2.84%
4.2.8	133	2.57%
5.1.6	125	2.41%
4.2	124	2.39%
4.2.7	120	2.32%
5.0.11	120	2.32%
5.0.13	117	2.26%
4.2.9	115	2.22%
4.0.6	113	2.18%
4.3.8	110	2.12%
5.1.4	107	2.07%
4.3.6	102	1.97%
4.0.1	96	1.85%
5.1.2	95	1.83%
4.3.12	88	1.70%
3.5.9	82	1.58%
5.0.10	75	1.45%
5.1.1	69	1.33%
5.0.6	65	1.25%
4.2.4	56	1.08%
4.2.6	53	1.02%
Other	976	18.84%
Trend Micro (4,842 servers)
Version	Number of Servers	Percent
5.5	2,448	50.56%
5.7	1,838	37.96%
5.18	489	10.10%
Other	67	1.38%
WinWebMail (4,368 servers)
Version	Number of Servers	Percent
3.7.1.1	1,209	27.68%
3.7.3.1	887	20.31%
3.6.3.1	865	19.80%
3.7.0.5	551	12.61%
3.7.0.7	438	10.03%
3.7.0.3	369	8.45%
Other	49	1.12%
Kerio (4,324 servers)
Version	Number of Servers	Percent
6.3.1	1,416	32.75%
6.3.0	621	14.36%
6.2.2	291	6.73%
6.1.3	205	4.74%
6.1.2	201	4.65%
6.2.0	186	4.30%
6.1.0	177	4.09%
6.1.4	173	4.00%
6.0.10	143	3.31%
6.1.1	98	2.27%
6.0.3	91	2.10%
6.2.1	76	1.76%
6.0.8	67	1.55%
5.7.10	60	1.39%
6.0.9	59	1.36%
6.0.6	45	1.04%
Other	415	9.60%
GroupWise (4,054 servers)
Version	Number of Servers	Percent
7.0.1	1,293	31.89%
6.5.4	493	12.16%
6.5.7	332	8.19%
6.0.4	300	7.40%
7.0	280	6.91%
6.5.6	263	6.49%
6.5.5	230	5.67%
6.5.1	191	4.71%
6.5.3	104	2.57%
6.5.2	100	2.47%
6.0.2	91	2.24%
6.0.3	84	2.07%
5.5.5	73	1.80%
6.5.0	55	1.36%
6.0.1	53	1.31%
Other	112	2.76%
ArGoSoft (3,099 servers)
Version	Number of Servers	Percent
1.8 (1.8.8.8)	990	31.95%
1.8 (1.8.8.7)	548	17.68%
1.8 (1.8.8.9)	322	10.39%
1.8 (1.8.8.1)	105	3.39%
1.8 (1.8.6.0)	91	2.94%
1.8 (1.8.8.3)	73	2.36%
1.8 (1.8.8.5)	69	2.23%
1.8 (1.8.8.2)	69	2.23%
1.8 (1.8.8.9	64	2.07%
1.8 (1.8.8.4)	54	1.74%
1.8 (1.8.5.9)	48	1.55%
1.8 (1.8.7.5)	47	1.52%
1.8 (1.8.6.6)	39	1.26%
1.8 (1.8.8.6)	36	1.16%
Other	544	17.55%
XMail (2,501 servers)
Version	Number of Servers	Percent
1.22	961	38.42%
1.21	462	18.47%
1.20	219	8.76%
1.24	212	8.48%
1.17	190	7.60%
1.23	133	5.32%
1.12	76	3.04%
1.18	65	2.60%
1.16	42	1.68%
1.10	35	1.40%
1.15	27	1.08%
Other	79	3.16%
SurgeSMTP (1,748 servers)
Version	Number of Servers	Percent
3.8f3-3	381	21.80%
3.8f2-2	371	21.22%
3.7b8-8	275	15.73%
3.6f5-5	139	7.95%
3.5b3-3	84	4.81%
3.0c2-2	78	4.46%
3.7b6-6	50	2.86%
3.8g-7	48	2.75%
3.8g-21	45	2.57%
2.1c7-7	28	1.60%
2.0g2-1	24	1.37%
1.8g3	20	1.14%
Other	205	11.73%
Gordano Messaging Suite (GMS) (1,521 servers)
Version	Number of Servers	Percent
Other	1,521	100.00%
Qmail Toaster (1,278 servers)
Version	Number of Servers	Percent
1.3	637	49.84%
1.2	517	40.45%
1.0	123	9.62%
Other	1	0.08%
NetIQ MailMarshal (1,271 servers)
Version	Number of Servers	Percent
6.0.3.8	929	73.09%
5.5.6.7	91	7.16%
6.1.3.15	62	4.88%
5.5.5.9	36	2.83%
5.5.4.16	32	2.52%
5.5.6.6	30	2.36%
5.5.6.5	24	1.89%
5.5.4.17	14	1.10%
5.5.5.6	13	1.02%
Other	40	3.15%
Post.Office (1,221 servers)
Version	Number of Servers	Percent
3.5.3	398	32.60%
3.5.3J	109	8.93%
3.8.3	74	6.06%
3.6.3	71	5.81%
4.0.1	56	4.59%
3.6.2	51	4.18%
3.1.2J	44	3.60%
3.9.1	39	3.19%
3.1.2	35	2.87%
3.9.2	30	2.46%
3.8.4	28	2.29%
3.9.0	26	2.13%
3.5.2	26	2.13%
3.6.0	25	2.05%
3.8.7.4	22	1.80%
4.0.0.2	22	1.80%
4.0.0.1	17	1.39%
3.9.2.3	16	1.31%
3.9.1.3	14	1.15%
Other	118	9.66%
InterScan VirusWall (1,199 servers)
Version	Number of Servers	Percent
Other	1,199	100.00%
Interscan (1,041 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	237	22.77%
3.81-Build_1022	129	12.39%
3.8-Build_3013	109	10.47%
3.53 (build 2011)	91	8.74%
3.55 (build 1029)	88	8.45%
3.53 (build 2017)	84	8.07%
3.53 (build 2013)	48	4.61%
3.55 (build 1020)	37	3.55%
3.53 (build 1493)	34	3.27%
3.52 (build 1375)	26	2.50%
3.8-Build_1080	22	2.11%
3.8-Build_3065	15	1.44%
3.81-Build_1084	15	1.44%
Other	106	10.18%
VisNetic (649 servers)
Version	Number of Servers	Percent
8.5.0.8	116	17.87%
7.2.4.1	51	7.86%
5.8.6.6	46	7.09%
8.0.3.0	45	6.93%
5.0.2.3	39	6.01%
8.3.5.0	38	5.86%
6.2.2.0	37	5.70%
8.0.3.1	33	5.08%
5.5.8.3	32	4.93%
7.6.1.0	31	4.78%
8.3.6	26	4.01%
8.5.0.5	21	3.24%
5.3.5.0	16	2.47%
8.0.3	16	2.47%
7.5.3.0	14	2.16%
5.4.5.4	14	2.16%
8.3.0.1	12	1.85%
5.8.6.4	9	1.39%
7.2.4.0	9	1.39%
5.0.1	7	1.08%
Other	37	5.70%
ModusMail (598 servers)
Version	Number of Servers	Percent
4.35.480.0	358	59.87%
3.2.315.0	37	6.19%
4.1.361.21	30	5.02%
4.2.425.22	27	4.52%
3.1.302.0	25	4.18%
3.1.297.0	19	3.18%
4.35.477.0	18	3.01%
4.3.459.0	15	2.51%
4.35.480.11	13	2.17%
4.1.361.0	9	1.51%
4.2.425.4	8	1.34%
4.2.425.16	6	1.00%
Other	33	5.52%
Mirapoint (546 servers)
Version	Number of Servers	Percent
3.8.3-GA	108	19.78%
3.7.5a-GA	99	18.13%
3.8.2-GA	80	14.65%
3.7.3a-GA	48	8.79%
3.7.4b-GA	41	7.51%
3.7.5-GA	29	5.31%
3.7.2-GA	18	3.30%
3.7.1-GA	17	3.11%
3.5.8-GR	15	2.75%
1.1.0	10	1.83%
3.7.0-GA	10	1.83%
3.6.6-GR	8	1.47%
3.8.0-FCS	8	1.47%
3.7.3-GA	7	1.28%
3.6.4-CR	6	1.10%
Other	42	7.69%
WebSTAR V (307 servers)
Version	Number of Servers	Percent
5.4.0	94	30.62%
5.4.1	86	28.01%
5.3.4	65	21.17%
5.3.3	27	8.79%
5.3.2	20	6.51%
5.3.0	10	3.26%
Other	5	1.63%
Mercury (307 servers)
Version	Number of Servers	Percent
1.48	129	42.02%
3.32	111	36.16%
3.21c	26	8.47%
3.31	16	5.21%
1.44	12	3.91%
1.47	6	1.95%
Other	7	2.28%
MagicMail (265 servers)
Version	Number of Servers	Percent
Other	265	100.00%
MAILsweeper (249 servers)
Version	Number of Servers	Percent
4.3.12.0	44	17.67%
4.3.20.0	39	15.66%
4.3.17.0	38	15.26%
4.3.19.0	35	14.06%
4.3.14.0	33	13.25%
4.2.10.0	15	6.02%
4.2.1.0	11	4.42%
4.3.10.0	11	4.42%
4.3.1.0	8	3.21%
4.3.6.0	7	2.81%
4.2.5.0	5	2.01%
Other	3	1.20%
Neon Mail Server (167 servers)
Version	Number of Servers	Percent
3.0.9	76	45.51%
3.0.7	64	38.32%
3.0.8	10	5.99%
3.0.6	7	4.19%
3.1.0	7	4.19%
3.0.4	2	1.20%
Other	1	0.60%
WebSTAR (143 servers)
Version	Number of Servers	Percent
Other	143	100.00%
MessageWall (114 servers)
Version	Number of Servers	Percent
1.0.8	81	71.05%
1.0.11	16	14.04%
1.1.23	7	6.14%
1.0.6	3	2.63%
1.1.0	3	2.63%
1.0.10	2	1.75%
Other	2	1.75%
OpenVMS (33 servers)
Version	Number of Servers	Percent
7.3	12	36.36%
8.2	10	30.30%
7.2	5	15.15%
8.3	5	15.15%
6.1	1	3.03%
Other	0	0.00%