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	1,768,102	100.0%
Number of Servers that didn't respond	346,774	19.61%
Server didn't open socket	339,817	19.22%
Server didn't provide banner	6,957	0.39%
Server provided banner	1,421,328	80.39%
Server banner identifies software in use	874,884	49.48%

As indicated by the above table, of the 1,768,102 servers queried, only 874,884 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	487,951	55.77%
Postfix	309,994	35.43%
Sendmail	35,457	4.05%
MailEnable	19,676	2.25%
MDaemon	8,489	0.97%
Microsoft	5,773	0.66%
IMail	1,549	0.18%
CommuniGate Pro	1,359	0.16%
XMail	851	0.10%
Lotus Domino	599	0.07%
WinWebMail	598	0.07%
Qmail Toaster	570	0.07%
SurgeSMTP	498	0.06%
OpenSMTPD	346	0.04%
Kerio	304	0.03%
Merak	197	0.02%
MagicMail	158	0.02%
ArGoSoft	133	0.02%
Post.Office	123	0.01%
GroupWise	71	0.01%
Gordano Messaging Suite (GMS)	56	0.01%
Trend Micro	55	0.01%
InterScan VirusWall	19	0.00%
VisNetic	17	0.00%
OpenVMS	11	0.00%
Mirapoint	8	0.00%
Mercury	6	0.00%
Interscan	4	0.00%
Neon Mail Server	3	0.00%
MessageWall	3	0.00%
WebSTAR V	3	0.00%
WebSTAR	2	0.00%
ModusMail	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (487,951 servers)
Version	Number of Servers	Percent
4.91	373,873	76.62%
4.89	29,395	6.02%
4.87	26,718	5.48%
4.84	12,216	2.50%
4.90	11,478	2.35%
4.80	5,095	1.04%
4.86	4,966	1.02%
Other	24,210	4.96%
Postfix (309,994 servers)
Version	Number of Servers	Percent
Other	309,994	100.00%
Sendmail (35,457 servers)
Version	Number of Servers	Percent
8.15.2	11,238	31.69%
8.14.4	7,654	21.59%
8.13.8	4,560	12.86%
8.14.7	2,780	7.84%
8.13.1	2,287	6.45%
8.14.5	2,007	5.66%
8.14.9	1,563	4.41%
8.14.3	886	2.50%
Other	2,482	7.00%
MailEnable (19,676 servers)
Version	Number of Servers	Percent
10.12--	3,162	16.07%
9.00--	1,834	9.32%
9.16--	1,688	8.58%
8.60--	595	3.02%
8.53--	540	2.74%
6.5--	455	2.31%
8.51--	374	1.90%
10.18--	327	1.66%
8.60-8.60-	323	1.64%
10.19--	317	1.61%
8.04--	292	1.48%
10.16--	280	1.42%
1.986--	263	1.34%
9.75--	228	1.16%
Other	8,998	45.73%
MDaemon (8,489 servers)
Version	Number of Servers	Percent
18.5.1	688	8.10%
13.5.1	498	5.87%
13.6.3	398	4.69%
18.5.0	382	4.50%
18.0.2	364	4.29%
13.0.4	355	4.18%
16.5.2	339	3.99%
13.0.5	335	3.95%
11.0.0	332	3.91%
11.0.3	327	3.85%
12.5.4	192	2.26%
12.5.6	188	2.21%
14.5.2	162	1.91%
16.0.4	154	1.81%
15.0.3	138	1.63%
17.5.3	134	1.58%
17.5.2	133	1.57%
10.0.0	127	1.50%
10.1.2	125	1.47%
16.5.1	112	1.32%
10.1.0	105	1.24%
16.0.1	94	1.11%
13.0.2	89	1.05%
Other	2,718	32.02%
Microsoft (5,773 servers)
Version	Number of Servers	Percent
6.0.3790.4675	2,926	50.68%
7.5.7601.17514	748	12.96%
8.5.9600.16384	688	11.92%
6.0.3790.3959	344	5.96%
8.0.9200.16384	161	2.79%
10.0.14393.0	131	2.27%
5.0.2195.5329	124	2.15%
7.0.6002.18264	102	1.77%
6.0.3790.1830	89	1.54%
10.0.14393.2608	89	1.54%
5.0.2195.6713	67	1.16%
Other	304	5.27%
IMail (1,549 servers)
Version	Number of Servers	Percent
12.5.6.101	305	19.69%
8.22	156	10.07%
12.4.1.15	133	8.59%
12.5.5.115	120	7.75%
12.5.4.146	102	6.58%
12.5.3.93	89	5.75%
9.23	74	4.78%
8.15	72	4.65%
12.3.0.100	70	4.52%
8.05	47	3.03%
11.03	44	2.84%
12.5.5.117	23	1.48%
11.5	22	1.42%
10.02	20	1.29%
7.07	18	1.16%
7.15	17	1.10%
8.00	16	1.03%
Other	221	14.27%
CommuniGate Pro (1,359 servers)
Version	Number of Servers	Percent
6.1.16.	44	3.24%
6.2.9	38	2.80%
5.3.13.	35	2.58%
6.0.11.	31	2.28%
6.1.16	27	1.99%
6.1.18	27	1.99%
6.2.7	26	1.91%
5.4.11.	25	1.84%
5.4.11	23	1.69%
6.2.9.	23	1.69%
6.0.11	22	1.62%
5.1.16	22	1.62%
5.2.20.	21	1.55%
6.2.7.	20	1.47%
6.1.18.	20	1.47%
6.1.11	19	1.40%
6.1.10	18	1.32%
6.2.8.	18	1.32%
6.1.2.	17	1.25%
6.1.11.	17	1.25%
5.2.20	16	1.18%
6.2.8	16	1.18%
6.2.4	15	1.10%
6.0.9.	15	1.10%
5.2.3	15	1.10%
6.2.1	15	1.10%
6.1.20	14	1.03%
6.0.9	14	1.03%
6.1.19	14	1.03%
Other	732	53.86%
XMail (851 servers)
Version	Number of Servers	Percent
1.27	405	47.59%
1.22	263	30.90%
1.25	54	6.35%
1.26	51	5.99%
1.24	35	4.11%
1.21	11	1.29%
1.17	9	1.06%
Other	23	2.70%
Lotus Domino (599 servers)
Version	Number of Servers	Percent
8.5.3FP6	114	19.03%
8.5.3	87	14.52%
8.5.2	33	5.51%
7.0.2	28	4.67%
8.5.1	22	3.67%
8.5	22	3.67%
8.5.3FP2	16	2.67%
8.5.2FP4	15	2.50%
8.5.3FP1	15	2.50%
8.5.3FP3	13	2.17%
8.5.3FP4	13	2.17%
7.0.3	12	2.00%
8.5.2FP2	11	1.84%
7.0	11	1.84%
8.0	11	1.84%
8.5.2FP3	9	1.50%
8.5.1FP5	9	1.50%
6.5	9	1.50%
8.0.1	8	1.34%
6.5.5	8	1.34%
7.0.4	7	1.17%
8.5.3FP5	7	1.17%
6.5.4	7	1.17%
7.0.3FP1	6	1.00%
8.5.2FP4HF759	6	1.00%
Other	100	16.69%
WinWebMail (598 servers)
Version	Number of Servers	Percent
3.9.0.7	115	19.23%
3.8.1.3	69	11.54%
4.2.0.1	59	9.87%
3.9.0.1	41	6.86%
3.8.0.1	33	5.52%
3.7.6.1	28	4.68%
4.1.0.1	25	4.18%
3.8.1.5	24	4.01%
3.8.1.1	18	3.01%
3.8.5.1	18	3.01%
3.7.3.1	17	2.84%
3.8.6.1	17	2.84%
4.0.0.1	16	2.68%
3.9.3.1	13	2.17%
3.9.5.3	13	2.17%
3.8.2.1	12	2.01%
3.9.2.1	11	1.84%
3.7.7.3	11	1.84%
3.8.3.1	7	1.17%
3.9.5.1	7	1.17%
3.7.0.5	6	1.00%
3.7.1.1	6	1.00%
Other	32	5.35%
Qmail Toaster (570 servers)
Version	Number of Servers	Percent
1.3	439	77.02%
1.03	111	19.47%
1.2	8	1.40%
1.03.5	6	1.05%
Other	6	1.05%
SurgeSMTP (498 servers)
Version	Number of Servers	Percent
7.3i2-2	94	18.88%
7.3e2-2	93	18.67%
7.1e-1	33	6.63%
6.5a2-2	26	5.22%
7.3o4-4	22	4.42%
7.2i-1	21	4.22%
6.7c-1	19	3.82%
7.2a-1	18	3.61%
7.3o2-2	15	3.01%
7.0c2-2	13	2.61%
3.9e-1	12	2.41%
6.9c-1	11	2.21%
7.2e-2	9	1.81%
6.5a-1	9	1.81%
5.2a-1	8	1.61%
6.4a-1	7	1.41%
6.1c-1	7	1.41%
4.0u4-4	7	1.41%
7.3n-1	5	1.00%
7.3p-17	5	1.00%
Other	64	12.85%
OpenSMTPD (346 servers)
Version	Number of Servers	Percent
Other	346	100.00%
Kerio (304 servers)
Version	Number of Servers	Percent
6.7.3	60	19.74%
6.7.0	44	14.47%
6.6.2	31	10.20%
6.5.2	29	9.54%
6.7.2	27	8.88%
6.4.1	16	5.26%
6.6.1	16	5.26%
6.5.0	13	4.28%
6.3.1	10	3.29%
6.7.1	9	2.96%
6.4.0	8	2.63%
6.6.0	6	1.97%
6.3.0	5	1.64%
6.5.1	5	1.64%
6.1.3	4	1.32%
Other	21	6.91%
Merak (197 servers)
Version	Number of Servers	Percent
8.0.3	49	24.87%
8.9.1	42	21.32%
8.5.0	13	6.60%
7.4.5	11	5.58%
7.5.2	10	5.08%
7.6.1	10	5.08%
8.3.8	10	5.08%
9.0.3	7	3.55%
7.6.4	6	3.05%
7.4.2	4	2.03%
7.2.0	4	2.03%
7.6.0	3	1.52%
7.0.1	3	1.52%
6.0.8	3	1.52%
4.4.1	2	1.02%
Other	20	10.15%
MagicMail (158 servers)
Version	Number of Servers	Percent
Other	158	100.00%
ArGoSoft (133 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	49	36.84%
1.8 (1.8.9.3)	19	14.29%
1.8 (1.8.9.5)	18	13.53%
1.8 (1.8.9.1)	11	8.27%
1.8 (1.8.8.8)	5	3.76%
1.8 (1.8.7.3)	3	2.26%
1.8 (1.8.8.7)	3	2.26%
1.8 (1.8.2.1)	2	1.50%
1.8 (1.8.7.6)	2	1.50%
1.8 (1.8.8.9)	2	1.50%
1.8 (1.8.9.4)	2	1.50%
1.8 (1.8.5.8)	2	1.50%
1.8 (1.8.8.4)	2	1.50%
1.8 (1.8.6.0)	2	1.50%
Other	11	8.27%
Post.Office (123 servers)
Version	Number of Servers	Percent
4.3	31	25.20%
4.2.2	22	17.89%
4.4	12	9.76%
4.1.2.4	12	9.76%
3.5.3	10	8.13%
4.2.1.3	7	5.69%
4.1.1	3	2.44%
3.5.1	3	2.44%
3.9.2.3	3	2.44%
4.2.1.1	3	2.44%
3.5.3J	3	2.44%
3.9.2	2	1.63%
Other	12	9.76%
GroupWise (71 servers)
Version	Number of Servers	Percent
14.2.2	14	19.72%
18.0.2	9	12.68%
14.2.3	8	11.27%
14.2.1	6	8.45%
18.1.0	5	7.04%
14.2.0	4	5.63%
6.5.7	4	5.63%
14.0.1	3	4.23%
7.0.3	2	2.82%
8.0.3	2	2.82%
6.0.4	2	2.82%
18.0.1	2	2.82%
6.5.5	1	1.41%
6.5.1	1	1.41%
12.0.1	1	1.41%
6.5.2	1	1.41%
6.5.0	1	1.41%
6.5.6	1	1.41%
14.0.0	1	1.41%
7.0.4	1	1.41%
7.0.1	1	1.41%
6.0.2	1	1.41%
Other	0	0.00%
Gordano Messaging Suite (GMS) (56 servers)
Version	Number of Servers	Percent
Other	56	100.00%
Trend Micro (55 servers)
Version	Number of Servers	Percent
5.7	17	30.91%
5.18	12	21.82%
5.5	8	14.55%
7.0	7	12.73%
7.5	5	9.09%
3.53	2	3.64%
7.1	1	1.82%
9.0	1	1.82%
8.5	1	1.82%
8	1	1.82%
Other	0	0.00%
InterScan VirusWall (19 servers)
Version	Number of Servers	Percent
Other	19	100.00%
VisNetic (17 servers)
Version	Number of Servers	Percent
9.3.2.0	8	47.06%
5.5.8.3	2	11.76%
8.0.3.1	1	5.88%
6.2.2.0	1	5.88%
8.0.3	1	5.88%
9.1.4.0	1	5.88%
5.0.2.0	1	5.88%
5.0.2.3	1	5.88%
5.8.6.6	1	5.88%
Other	0	0.00%
OpenVMS (11 servers)
Version	Number of Servers	Percent
7.3	5	45.45%
8.4	4	36.36%
8.2	1	9.09%
8.3	1	9.09%
Other	0	0.00%
Mirapoint (8 servers)
Version	Number of Servers	Percent
4.4.3-GA	2	25.00%
4.3.5-GA	2	25.00%
4.4.2a-FCS	2	25.00%
4.4.6-GA	1	12.50%
3.10.10a-GA	1	12.50%
Other	0	0.00%
Mercury (6 servers)
Version	Number of Servers	Percent
1.48	3	50.00%
3.32	3	50.00%
Other	0	0.00%
Interscan (4 servers)
Version	Number of Servers	Percent
3.81-Build_1022	2	50.00%
3.8-Build_1080	1	25.00%
3.8-Build_3013	1	25.00%
Other	0	0.00%
Neon Mail Server (3 servers)
Version	Number of Servers	Percent
3.1.2	1	33.33%
3.1.0	1	33.33%
3.1.3	1	33.33%
Other	0	0.00%
MessageWall (3 servers)
Version	Number of Servers	Percent
1.0.8	3	100.00%
Other	0	0.00%
WebSTAR V (3 servers)
Version	Number of Servers	Percent
5.4.1	3	100.00%
Other	0	0.00%
WebSTAR (2 servers)
Version	Number of Servers	Percent
Other	2	100.00%
ModusMail (1 servers)
Version	Number of Servers	Percent
4.1.361.21	1	100.00%
Other	0	0.00%