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	1,661,883	100.0%
Number of Servers that didn't respond	262,129	15.77%
Server didn't open socket	252,349	15.18%
Server didn't provide banner	9,780	0.59%
Server provided banner	1,399,754	84.23%
Server banner identifies software in use	805,476	48.47%

As indicated by the above table, of the 1,661,883 servers queried, only 805,476 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	221,243	27.47%
Sendmail	181,431	22.52%
Microsoft	162,886	20.22%
Postfix	142,456	17.69%
MailEnable	23,807	2.96%
MDaemon	19,888	2.47%
IMail	15,650	1.94%
Kerio	5,410	0.67%
Lotus Domino	5,115	0.64%
WinWebMail	5,025	0.62%
Merak	3,986	0.49%
CommuniGate Pro	3,911	0.49%
XMail	2,265	0.28%
GroupWise	1,862	0.23%
ArGoSoft	1,795	0.22%
Trend Micro	1,683	0.21%
Qmail Toaster	1,569	0.19%
SurgeSMTP	1,354	0.17%
Gordano Messaging Suite (GMS)	699	0.09%
Post.Office	585	0.07%
Mirapoint	484	0.06%
MagicMail	395	0.05%
InterScan VirusWall	394	0.05%
VisNetic	391	0.05%
NetIQ MailMarshal	304	0.04%
Interscan	253	0.03%
Neon Mail Server	135	0.02%
WebSTAR V	134	0.02%
Mercury	114	0.01%
ModusMail	71	0.01%
MessageWall	59	0.01%
WebSTAR	49	0.01%
MAILsweeper	46	0.01%
OpenVMS	27	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (221,243 servers)
Version	Number of Servers	Percent
4.69	168,035	75.95%
4.63	18,449	8.34%
4.67	9,895	4.47%
4.68	5,988	2.71%
4.66	4,090	1.85%
4.60	3,851	1.74%
4.50	2,963	1.34%
4.62	2,669	1.21%
Other	5,303	2.40%
Sendmail (181,431 servers)
Version	Number of Servers	Percent
8.13.1	30,979	17.07%
8.12.11.20060614	18,979	10.46%
8.13.8	18,053	9.95%
8.13.6	17,870	9.85%
8.12.11.20060308	15,533	8.56%
8.13.6.20060614	10,325	5.69%
8.11.6	10,242	5.65%
8.12.10	8,572	4.72%
8.12.11	8,518	4.69%
8.14.3	7,836	4.32%
8.14.1	6,448	3.55%
8.14.2	5,821	3.21%
8.13.4	4,492	2.48%
8.13.7	3,958	2.18%
8.12.8	3,422	1.89%
8.9.3	1,979	1.09%
Other	8,404	4.63%
Microsoft (162,886 servers)
Version	Number of Servers	Percent
6.0.3790.3959	127,663	78.38%
6.0.3790.1830	20,722	12.72%
5.0.2195.6713	9,636	5.92%
6.0.3790.211	2,405	1.48%
Other	2,460	1.51%
Postfix (142,456 servers)
Version	Number of Servers	Percent
Other	142,456	100.00%
MailEnable (23,807 servers)
Version	Number of Servers	Percent
1.981--	4,638	19.48%
1.986--	4,311	18.11%
1.983--	2,796	11.74%
1.96--	1,022	4.29%
1.95--	959	4.03%
0-3.6-	880	3.70%
1.9--	770	3.23%
1.8--	626	2.63%
0-2.37-	546	2.29%
0-3.14-	539	2.26%
--3.6	520	2.18%
0-3.53-	434	1.82%
0-1.85-	388	1.63%
0-1.87-	296	1.24%
0-2.52-	287	1.21%
0--3.53	269	1.13%
0-2.38-	245	1.03%
Other	4,281	17.98%
MDaemon (19,888 servers)
Version	Number of Servers	Percent
10.0.4	2,089	10.50%
10.0.3	1,357	6.82%
10.0.2	1,357	6.82%
9.6.6	1,325	6.66%
9.6.1	1,168	5.87%
9.6.5	1,123	5.65%
10.0.0	938	4.72%
9.6.4	721	3.63%
9.5.2	716	3.60%
10.0.1	700	3.52%
8.1.3	654	3.29%
9.6.2	648	3.26%
9.5.6	647	3.25%
9.0.4	583	2.93%
9.5.1	552	2.78%
9.6.3	396	1.99%
7.2.3	371	1.87%
6.8.5	359	1.81%
9.0.1	300	1.51%
7.2.0	297	1.49%
9.5.5	234	1.18%
9.0.0	226	1.14%
8.0.2	220	1.11%
8.1.4	210	1.06%
Other	2,697	13.56%
IMail (15,650 servers)
Version	Number of Servers	Percent
8.22	3,077	19.66%
8.15	1,647	10.52%
10.02	1,333	8.52%
9.23	1,318	8.42%
9.10	968	6.19%
8.05	929	5.94%
10.01	841	5.37%
7.07	602	3.85%
9.21	517	3.30%
7.15	446	2.85%
6.06	410	2.62%
8.00	380	2.43%
10.0	327	2.09%
8.04	304	1.94%
8.21	283	1.81%
9.20	283	1.81%
9.22	275	1.76%
8.01	216	1.38%
8.10	194	1.24%
Other	1,300	8.31%
Kerio (5,410 servers)
Version	Number of Servers	Percent
6.6.2	1,186	21.92%
6.5.2	676	12.50%
6.5.0	479	8.85%
6.6.0	473	8.74%
6.6.1	419	7.74%
6.4.1	362	6.69%
6.5.1	336	6.21%
6.3.1	304	5.62%
6.4.0	207	3.83%
6.4.2	202	3.73%
6.3.0	137	2.53%
6.1.3	61	1.13%
6.2.0	56	1.04%
Other	512	9.46%
Lotus Domino (5,115 servers)
Version	Number of Servers	Percent
7.0.2	493	9.64%
8.0.2	452	8.84%
8.0.1	406	7.94%
7.0.3	323	6.31%
6.5.4	268	5.24%
7.0.1	256	5.00%
6.5.1	226	4.42%
7.0.2FP2	215	4.20%
6.5.3	210	4.11%
8.5	185	3.62%
7.0.3FP1	174	3.40%
7.0	159	3.11%
6.5.5	159	3.11%
8.0	158	3.09%
6.5	144	2.82%
7.0.2FP1	100	1.96%
6.5.2	96	1.88%
5.0.11	86	1.68%
7.0.2FP3	69	1.35%
5.0.12	55	1.08%
6.5.6	55	1.08%
Other	826	16.15%
WinWebMail (5,025 servers)
Version	Number of Servers	Percent
3.7.6.1	1,229	24.46%
3.7.3.1	1,051	20.92%
3.7.7.3	702	13.97%
3.7.1.1	565	11.24%
3.7.5.1	328	6.53%
3.6.3.1	303	6.03%
3.7.0.5	244	4.86%
3.7.7.1	230	4.58%
3.7.0.3	168	3.34%
3.7.0.7	162	3.22%
Other	43	0.86%
Merak (3,986 servers)
Version	Number of Servers	Percent
8.0.3	1,656	41.55%
8.9.1	361	9.06%
8.5.0	249	6.25%
7.4.5	200	5.02%
7.6.4	185	4.64%
7.5.2	177	4.44%
8.3.8	173	4.34%
7.4.2	79	1.98%
9.0.0	76	1.91%
7.6.1	58	1.46%
7.2.0	57	1.43%
8.2.4	52	1.30%
8.2.13	52	1.30%
6.2.1	49	1.23%
8.9.0	42	1.05%
Other	520	13.05%
CommuniGate Pro (3,911 servers)
Version	Number of Servers	Percent
4.1.8	325	8.31%
5.1.13	197	5.04%
5.2.12	195	4.99%
4.2.10	190	4.86%
5.2.8	176	4.50%
5.2.10	155	3.96%
5.1.16	148	3.78%
5.2.11	144	3.68%
5.1.12	136	3.48%
5.1.14	114	2.91%
5.2.9	100	2.56%
5.2.6	100	2.56%
5.2.3	94	2.40%
5.0.9	87	2.22%
5.0.13	84	2.15%
5.2.0	80	2.05%
5.2.5	80	2.05%
5.0.14	73	1.87%
5.1.9	58	1.48%
5.1.10	56	1.43%
5.1.8	53	1.36%
5.2.1	53	1.36%
4.3.12	50	1.28%
5.1.7	48	1.23%
4.2.8	46	1.18%
4.2	46	1.18%
5.2.7	45	1.15%
5.1.11	44	1.13%
4.2.9	44	1.13%
4.2.7	42	1.07%
Other	848	21.68%
XMail (2,265 servers)
Version	Number of Servers	Percent
1.22	631	27.86%
1.25	584	25.78%
1.24	418	18.45%
1.21	183	8.08%
1.20	93	4.11%
1.23	83	3.66%
1.17	82	3.62%
1.12	63	2.78%
1.16	32	1.41%
1.18	26	1.15%
Other	70	3.09%
GroupWise (1,862 servers)
Version	Number of Servers	Percent
7.0.3	608	32.65%
7.0.2	322	17.29%
6.5.7	223	11.98%
7.0.1	150	8.06%
6.5.4	126	6.77%
6.5.6	77	4.14%
6.0.4	70	3.76%
8.0.0	60	3.22%
6.5.1	56	3.01%
6.5.5	37	1.99%
7.0	33	1.77%
6.5.2	21	1.13%
Other	79	4.24%
ArGoSoft (1,795 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.5)	390	21.73%
1.8 (1.8.9.3)	272	15.15%
1.8 (1.8.9.1)	208	11.59%
1.8 (1.8.8.8)	140	7.80%
1.8 (1.8.8.7)	137	7.63%
1.8 (1.8.9.6)	91	5.07%
1.8 (1.8.9.2)	84	4.68%
1.8 (1.8.9.4)	52	2.90%
1.8 (1.8.8.9)	43	2.40%
1.8 (1.8.8.1)	36	2.01%
1.8 (1.8.9.0)	34	1.89%
1.8 (1.8.6.0)	28	1.56%
1.8 (1.8.8.2)	26	1.45%
1.8 (1.8.5.9)	18	1.00%
Other	236	13.15%
Trend Micro (1,683 servers)
Version	Number of Servers	Percent
5.7	798	47.42%
5.5	546	32.44%
5.18	220	13.07%
7.0	83	4.93%
5.15	18	1.07%
Other	18	1.07%
Qmail Toaster (1,569 servers)
Version	Number of Servers	Percent
1.3	1,329	84.70%
1.2	177	11.28%
1.0	43	2.74%
1.5	16	1.02%
Other	4	0.25%
SurgeSMTP (1,354 servers)
Version	Number of Servers	Percent
3.9e-1	456	33.68%
3.9c-1	133	9.82%
3.8k4-4	127	9.38%
3.9g2-2	103	7.61%
3.7b8-8	58	4.28%
3.8f3-3	57	4.21%
3.5b3-3	39	2.88%
3.6f5-5	38	2.81%
3.8i3-3	35	2.58%
3.8f2-2	31	2.29%
4.0a-1	26	1.92%
3.9h-65	22	1.62%
3.0c2-2	18	1.33%
3.8k2-2	16	1.18%
Other	195	14.40%
Gordano Messaging Suite (GMS) (699 servers)
Version	Number of Servers	Percent
Other	699	100.00%
Post.Office (585 servers)
Version	Number of Servers	Percent
3.5.3	149	25.47%
4.0.1	49	8.38%
4.1.0.2	47	8.03%
3.5.3J	33	5.64%
3.6.3	28	4.79%
3.8.3	28	4.79%
3.9.2.3	18	3.08%
3.9.1	18	3.08%
3.1.2J	17	2.91%
3.1.2	16	2.74%
3.6.2	15	2.56%
3.9.2	14	2.39%
3.8.7.4	14	2.39%
3.5.2	12	2.05%
3.9.0	11	1.88%
4.1	11	1.88%
3.8.4	11	1.88%
4.0.0.2	10	1.71%
3.6.0	7	1.20%
3.9.1.3	7	1.20%
3.9.2.1	7	1.20%
4.0.1.1	7	1.20%
4.0.0.1	6	1.03%
3.5.1	6	1.03%
Other	44	7.52%
Mirapoint (484 servers)
Version	Number of Servers	Percent
3.8.4-GA	78	16.12%
3.8.3-GA	65	13.43%
3.8.6-GA	44	9.09%
3.8.7a	43	8.88%
3.10.4-GA	31	6.40%
3.10.3-GA	30	6.20%
3.8.5-GA	22	4.55%
3.8.2-GA	22	4.55%
3.7.3a-GA	22	4.55%
3.7.5a-GA	21	4.34%
3.10.2-GA	17	3.51%
4.1.3-GA	17	3.51%
3.7.4b-GA	15	3.10%
4.0.5a	13	2.69%
4.1.2-GA	6	1.24%
Other	38	7.85%
MagicMail (395 servers)
Version	Number of Servers	Percent
Other	395	100.00%
InterScan VirusWall (394 servers)
Version	Number of Servers	Percent
Other	394	100.00%
VisNetic (391 servers)
Version	Number of Servers	Percent
9.3.2.0	92	23.53%
9.1.4.1	64	16.37%
5.8.6.6	19	4.86%
8.5.0.8	17	4.35%
7.2.4.1	16	4.09%
5.5.8.3	15	3.84%
9.1.4.0	15	3.84%
5.0.2.3	14	3.58%
6.2.2.0	14	3.58%
8.0.3.0	13	3.32%
7.6.1.0	12	3.07%
5.3.5.0	11	2.81%
8.0.3.1	10	2.56%
8.3.6	9	2.30%
8.3.5.0	9	2.30%
8.0.3	8	2.05%
5.4.5.4	7	1.79%
5.8.6.4	5	1.28%
6.0.9.0	5	1.28%
8.3.0.1	4	1.02%
7.2.4.0	4	1.02%
5.0.2.1	4	1.02%
Other	24	6.14%
NetIQ MailMarshal (304 servers)
Version	Number of Servers	Percent
6.0.3.8	244	80.26%
6.1.3.15	13	4.28%
5.5.6.7	13	4.28%
5.5.6.6	7	2.30%
5.5.4.16	7	2.30%
5.5.6.5	5	1.64%
Other	15	4.93%
Interscan (253 servers)
Version	Number of Servers	Percent
3.8-Build_3013	51	20.16%
3.55 (build 1016)	47	18.58%
3.81-Build_1022	33	13.04%
3.55 (build 1029)	22	8.70%
3.53 (build 2011)	17	6.72%
3.53 (build 2017)	15	5.93%
3.81-Build_1084	10	3.95%
3.53 (build 2013)	10	3.95%
3.53 (build 1493)	10	3.95%
3.55 (build 1020)	9	3.56%
3.52 (build 1375)	5	1.98%
3.51 (build 1337)	3	1.19%
3.8-Build_1080	3	1.19%
Other	18	7.11%
Neon Mail Server (135 servers)
Version	Number of Servers	Percent
3.1.3	41	30.37%
3.0.7	23	17.04%
3.1.4	20	14.81%
3.0.9	20	14.81%
3.1.0	13	9.63%
3.1.2	11	8.15%
3.1.1	3	2.22%
3.0.8	2	1.48%
Other	2	1.48%
WebSTAR V (134 servers)
Version	Number of Servers	Percent
5.4.1	44	32.84%
5.4.0	34	25.37%
5.3.4	30	22.39%
5.3.2	12	8.96%
5.3.3	11	8.21%
Other	3	2.24%
Mercury (114 servers)
Version	Number of Servers	Percent
1.48	57	50.00%
3.32	32	28.07%
3.21c	9	7.89%
3.31	4	3.51%
1.47	4	3.51%
3.21	2	1.75%
3.01a	2	1.75%
Other	4	3.51%
ModusMail (71 servers)
Version	Number of Servers	Percent
4.35.480.0	19	26.76%
3.2.315.0	13	18.31%
4.35.480.11	8	11.27%
3.1.302.0	6	8.45%
4.3.459.0	6	8.45%
4.35.477.0	4	5.63%
4.1.361.21	3	4.23%
4.2.420.0	3	4.23%
3.1.293.1	2	2.82%
4.2.425.22	1	1.41%
4.1.361.0	1	1.41%
4.2.425.4	1	1.41%
4.0.340.3	1	1.41%
4.0.330.8	1	1.41%
1.4.232.0	1	1.41%
4.35.477.8	1	1.41%
Other	0	0.00%
MessageWall (59 servers)
Version	Number of Servers	Percent
1.0.8	44	74.58%
1.0.11	13	22.03%
1.0.6	1	1.69%
1.1.0	1	1.69%
Other	0	0.00%
WebSTAR (49 servers)
Version	Number of Servers	Percent
Other	49	100.00%
MAILsweeper (46 servers)
Version	Number of Servers	Percent
4.3.20.0	15	32.61%
4.3.14.0	8	17.39%
4.3.17.0	7	15.22%
4.3.1.0	5	10.87%
4.2.10.0	4	8.70%
4.3.19.0	2	4.35%
4.3.10.0	2	4.35%
4.3.6.0	1	2.17%
4.2.5.0	1	2.17%
4.1.5.0	1	2.17%
Other	0	0.00%
OpenVMS (27 servers)
Version	Number of Servers	Percent
8.3	15	55.56%
7.3	6	22.22%
8.2	3	11.11%
7.2	2	7.41%
6.1	1	3.70%
Other	0	0.00%