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	2,007,645	100.0%
Number of Servers that didn't respond	371,217	18.49%
Server didn't open socket	361,667	18.01%
Server didn't provide banner	9,550	0.48%
Server provided banner	1,636,428	81.51%
Server banner identifies software in use	1,009,383	50.28%

As indicated by the above table, of the 2,007,645 servers queried, only 1,009,383 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	570,616	56.53%
Postfix	340,902	33.77%
Sendmail	46,302	4.59%
MailEnable	22,675	2.25%
MDaemon	10,860	1.08%
Microsoft	8,601	0.85%
IMail	1,995	0.20%
CommuniGate Pro	1,741	0.17%
XMail	1,003	0.10%
Lotus Domino	905	0.09%
WinWebMail	896	0.09%
SurgeSMTP	587	0.06%
Qmail Toaster	461	0.05%
Kerio	412	0.04%
OpenSMTPD	349	0.03%
Merak	256	0.03%
ArGoSoft	184	0.02%
MagicMail	165	0.02%
Post.Office	150	0.01%
Gordano Messaging Suite (GMS)	79	0.01%
GroupWise	78	0.01%
Trend Micro	62	0.01%
InterScan VirusWall	27	0.00%
VisNetic	23	0.00%
Mirapoint	14	0.00%
OpenVMS	10	0.00%
Mercury	8	0.00%
Interscan	6	0.00%
WebSTAR V	6	0.00%
MessageWall	4	0.00%
Neon Mail Server	4	0.00%
ModusMail	1	0.00%
WebSTAR	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (570,616 servers)
Version	Number of Servers	Percent
4.89	341,886	59.92%
4.87	130,970	22.95%
4.88	21,444	3.76%
4.84	19,066	3.34%
4.80	8,153	1.43%
4.86	7,257	1.27%
4.85	7,192	1.26%
4.72	6,555	1.15%
4.76	6,184	1.08%
Other	21,909	3.84%
Postfix (340,902 servers)
Version	Number of Servers	Percent
Other	340,902	100.00%
Sendmail (46,302 servers)
Version	Number of Servers	Percent
8.14.5	12,128	26.19%
8.14.4	10,563	22.81%
8.13.8	7,109	15.35%
8.13.1	4,296	9.28%
8.15.2	3,043	6.57%
8.14.3	2,071	4.47%
8.14.7	1,982	4.28%
8.14.9	1,325	2.86%
Other	3,785	8.17%
MailEnable (22,675 servers)
Version	Number of Servers	Percent
9.00--	3,064	13.51%
9.16--	1,754	7.74%
8.60--	1,084	4.78%
8.53--	961	4.24%
6.5--	807	3.56%
8.51--	659	2.91%
1.986--	509	2.24%
8.04--	472	2.08%
9.75--	466	2.06%
8.60-8.60-	410	1.81%
8.50--	320	1.41%
5.10--	291	1.28%
9.74--	284	1.25%
9.53--	278	1.23%
8.00--	276	1.22%
Other	11,040	48.69%
MDaemon (10,860 servers)
Version	Number of Servers	Percent
17.5.1	764	7.03%
16.5.2	681	6.27%
13.5.1	582	5.36%
13.6.3	494	4.55%
17.0.2	456	4.20%
11.0.0	453	4.17%
13.0.4	440	4.05%
11.0.3	436	4.01%
13.0.5	415	3.82%
17.5.0	333	3.07%
16.0.4	327	3.01%
12.5.6	236	2.17%
17.0.3	225	2.07%
12.5.4	220	2.03%
16.5.1	218	2.01%
15.0.3	200	1.84%
14.5.2	191	1.76%
10.0.0	168	1.55%
10.1.2	154	1.42%
16.0.1	139	1.28%
17.0.0	132	1.22%
15.5.3	127	1.17%
10.1.1	122	1.12%
13.0.2	113	1.04%
Other	3,234	29.78%
Microsoft (8,601 servers)
Version	Number of Servers	Percent
6.0.3790.4675	5,010	58.25%
7.5.7601.17514	1,075	12.50%
8.5.9600.16384	767	8.92%
6.0.3790.3959	571	6.64%
8.0.9200.16384	195	2.27%
5.0.2195.5329	162	1.88%
7.0.6002.18264	156	1.81%
6.0.3790.1830	142	1.65%
5.0.2195.7381	87	1.01%
Other	436	5.07%
IMail (1,995 servers)
Version	Number of Servers	Percent
12.5.5.115	280	14.04%
12.4.1.15	175	8.77%
8.22	149	7.47%
12.5.3.93	146	7.32%
12.5.6.101	140	7.02%
9.23	132	6.62%
12.5.4.146	129	6.47%
12.3.0.100	94	4.71%
8.15	92	4.61%
8.05	65	3.26%
11.03	57	2.86%
11.5	49	2.46%
12.5.5.117	33	1.65%
12.5.1.60	28	1.40%
7.15	27	1.35%
7.07	26	1.30%
10.02	25	1.25%
11.02	21	1.05%
10.01	21	1.05%
Other	306	15.34%
CommuniGate Pro (1,741 servers)
Version	Number of Servers	Percent
5.1.16	125	7.18%
6.1.16.	72	4.14%
6.1.16	65	3.73%
6.1.18	57	3.27%
6.1.18.	56	3.22%
6.2	45	2.58%
6.1.11	36	2.07%
6.1.10	34	1.95%
5.2.20	33	1.90%
5.3.13.	33	1.90%
6.0.11.	33	1.90%
5.4.11	32	1.84%
5.4.11.	31	1.78%
6.1.2.	27	1.55%
6.1.17	26	1.49%
6.1.15.	25	1.44%
5.2.20.	25	1.44%
6.0.11	25	1.44%
5.1.16.	23	1.32%
6.1.11.	23	1.32%
6.0.9.	22	1.26%
6.0.9	21	1.21%
6.1.13	20	1.15%
5.2.3	20	1.15%
6.1.14	19	1.09%
6.1.17.	18	1.03%
5.0.14.	18	1.03%
Other	777	44.63%
XMail (1,003 servers)
Version	Number of Servers	Percent
1.27	439	43.77%
1.22	327	32.60%
1.25	68	6.78%
1.26	67	6.68%
1.24	39	3.89%
1.21	18	1.79%
1.23	12	1.20%
Other	33	3.29%
Lotus Domino (905 servers)
Version	Number of Servers	Percent
8.5.3FP6	177	19.56%
8.5.3	120	13.26%
8.5.2	42	4.64%
7.0.2	37	4.09%
8.5.1	34	3.76%
8.5	32	3.54%
8.5.3FP2	24	2.65%
8.5.3FP4	23	2.54%
8.5.3FP1	23	2.54%
7.0.3	22	2.43%
8.5.2FP4	21	2.32%
8.5.3FP3	20	2.21%
8.5.2FP3	19	2.10%
8.5.2FP2	18	1.99%
8.5.3FP5	17	1.88%
8.0	16	1.77%
7.0	14	1.55%
8.0.1	14	1.55%
7.0.4	13	1.44%
6.5.1	13	1.44%
7.0.1	11	1.22%
8.5.1FP5	11	1.22%
6.5	10	1.10%
7.0.3FP1	10	1.10%
Other	164	18.12%
WinWebMail (896 servers)
Version	Number of Servers	Percent
3.9.0.7	200	22.32%
3.8.1.3	128	14.29%
3.9.0.1	68	7.59%
3.8.0.1	57	6.36%
3.7.6.1	51	5.69%
3.8.1.5	41	4.58%
3.8.1.1	32	3.57%
3.9.5.1	30	3.35%
3.7.3.1	29	3.24%
3.8.5.1	29	3.24%
3.8.6.1	25	2.79%
3.9.2.1	25	2.79%
3.7.7.3	25	2.79%
3.9.3.1	23	2.57%
3.8.2.1	17	1.90%
3.8.3.1	16	1.79%
3.9.5.3	16	1.79%
3.7.1.1	15	1.67%
3.8.3.3	10	1.12%
3.7.0.5	10	1.12%
Other	49	5.47%
SurgeSMTP (587 servers)
Version	Number of Servers	Percent
7.1e-1	74	12.61%
7.3e2-2	68	11.58%
7.2i-1	61	10.39%
7.3c3-3	58	9.88%
6.5a2-2	36	6.13%
7.2a-1	35	5.96%
6.7c-1	26	4.43%
7.2e-2	26	4.43%
6.5a-1	19	3.24%
6.9c-1	18	3.07%
7.0c2-2	17	2.90%
3.9e-1	14	2.39%
5.2a-1	13	2.21%
6.1c-1	12	2.04%
7.3d-5	11	1.87%
4.0u4-4	9	1.53%
6.4a-1	8	1.36%
3.8k4-4	6	1.02%
Other	76	12.95%
Qmail Toaster (461 servers)
Version	Number of Servers	Percent
1.3	360	78.09%
1.03	76	16.49%
1.2	10	2.17%
1.03.5	7	1.52%
Other	8	1.74%
Kerio (412 servers)
Version	Number of Servers	Percent
6.7.3	88	21.36%
6.7.0	52	12.62%
6.6.2	38	9.22%
6.5.2	38	9.22%
6.7.2	30	7.28%
6.5.0	22	5.34%
6.6.1	18	4.37%
6.4.1	17	4.13%
6.7.1	17	4.13%
6.3.1	14	3.40%
6.3.0	11	2.67%
6.5.1	10	2.43%
6.4.0	9	2.18%
6.1.3	8	1.94%
6.6.0	7	1.70%
6.4.2	5	1.21%
Other	28	6.80%
OpenSMTPD (349 servers)
Version	Number of Servers	Percent
Other	349	100.00%
Merak (256 servers)
Version	Number of Servers	Percent
8.0.3	74	28.91%
8.9.1	44	17.19%
8.5.0	20	7.81%
7.5.2	16	6.25%
7.4.5	13	5.08%
8.3.8	13	5.08%
7.6.1	12	4.69%
7.6.4	9	3.52%
9.0.3	4	1.56%
7.2.0	4	1.56%
7.4.2	3	1.17%
4.4.2	3	1.17%
7.0.1	3	1.17%
5.9.4	3	1.17%
4.2.1	3	1.17%
4.4.1	3	1.17%
7.6.0	3	1.17%
6.1.0	3	1.17%
6.0.8	3	1.17%
Other	20	7.81%
ArGoSoft (184 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	68	36.96%
1.8 (1.8.9.5)	22	11.96%
1.8 (1.8.9.3)	19	10.33%
1.8 (1.8.9.1)	18	9.78%
1.8 (1.8.7.3)	6	3.26%
1.8 (1.8.8.7)	6	3.26%
1.8 (1.8.8.8)	5	2.72%
1.8 (1.8.9.2)	4	2.17%
1.8 (1.8.8.9)	4	2.17%
1.8 (1.8.6.0)	4	2.17%
1.8 (1.8.9.4)	3	1.63%
1.8 (1.8.7.6)	2	1.09%
1.8 (1.8.8.4)	2	1.09%
1.8 (1.8.5.8)	2	1.09%
1.8 (1.8.2.1)	2	1.09%
1.8 (1.8.6.1a	2	1.09%
1.8 (1.8.5.9)	2	1.09%
Other	13	7.07%
MagicMail (165 servers)
Version	Number of Servers	Percent
Other	165	100.00%
Post.Office (150 servers)
Version	Number of Servers	Percent
4.3	31	20.67%
4.2.2	30	20.00%
4.1.2.4	19	12.67%
3.5.3	14	9.33%
4.2.1.3	9	6.00%
3.9.2.3	5	3.33%
4.2.1.1	4	2.67%
3.1.2	4	2.67%
3.9.2	3	2.00%
4.1.1	3	2.00%
3.5.1	3	2.00%
3.5.4	2	1.33%
4.0.1	2	1.33%
4.2	2	1.33%
4.1.0.3	2	1.33%
4.1.2.3	2	1.33%
3.8.7.4	2	1.33%
3.9.1.3	2	1.33%
3.5.3J	2	1.33%
Other	9	6.00%
Gordano Messaging Suite (GMS) (79 servers)
Version	Number of Servers	Percent
Other	79	100.00%
GroupWise (78 servers)
Version	Number of Servers	Percent
14.2.2	21	26.92%
14.2.1	8	10.26%
6.5.7	7	8.97%
14.2.0	6	7.69%
14.0.1	6	7.69%
14.0.0	4	5.13%
7.0.3	3	3.85%
6.0.4	3	3.85%
14.0.2	2	2.56%
12.0.1	2	2.56%
7.0.4	2	2.56%
6.0.2	2	2.56%
7.0.2	1	1.28%
8.0.3	1	1.28%
12.0.4	1	1.28%
6.5.0	1	1.28%
6.0.3	1	1.28%
6.5.5	1	1.28%
7.0.1	1	1.28%
8.0.1	1	1.28%
6.5.2	1	1.28%
8.0.2	1	1.28%
12.0.2	1	1.28%
18.0.0	1	1.28%
Other	0	0.00%
Trend Micro (62 servers)
Version	Number of Servers	Percent
5.7	21	33.87%
5.18	12	19.35%
5.5	10	16.13%
7.0	8	12.90%
7.5	5	8.06%
3.53	2	3.23%
7.1	1	1.61%
8.5	1	1.61%
8	1	1.61%
9.0	1	1.61%
Other	0	0.00%
InterScan VirusWall (27 servers)
Version	Number of Servers	Percent
Other	27	100.00%
VisNetic (23 servers)
Version	Number of Servers	Percent
9.3.2.0	7	30.43%
5.8.6.6	2	8.70%
5.5.8.3	2	8.70%
5.0.2.3	2	8.70%
6.2.2.0	1	4.35%
8.0.3	1	4.35%
9.1.4.0	1	4.35%
8.5.0.5	1	4.35%
7.6.1.0	1	4.35%
9.1.4.1	1	4.35%
8.0.3.1	1	4.35%
5.3.5.0	1	4.35%
5.0.2.0	1	4.35%
8.5.0.8	1	4.35%
Other	0	0.00%
Mirapoint (14 servers)
Version	Number of Servers	Percent
4.4.2a-FCS	4	28.57%
4.3.5-GA	3	21.43%
4.4.3-GA	3	21.43%
4.4.4-GA	1	7.14%
3.10.10a-GA	1	7.14%
4.4.3a-GA	1	7.14%
4.4.6-GA	1	7.14%
Other	0	0.00%
OpenVMS (10 servers)
Version	Number of Servers	Percent
7.3	6	60.00%
8.4	3	30.00%
8.2	1	10.00%
Other	0	0.00%
Mercury (8 servers)
Version	Number of Servers	Percent
3.32	4	50.00%
1.48	3	37.50%
3.21	1	12.50%
Other	0	0.00%
Interscan (6 servers)
Version	Number of Servers	Percent
3.81-Build_1022	2	33.33%
3.81-Build_1084	1	16.67%
3.8-Build_3013	1	16.67%
3.8-Build_1080	1	16.67%
3.5 (build 1294)	1	16.67%
Other	0	0.00%
WebSTAR V (6 servers)
Version	Number of Servers	Percent
5.4.1	3	50.00%
5.4.0	1	16.67%
5.3.2	1	16.67%
5.3.4	1	16.67%
Other	0	0.00%
MessageWall (4 servers)
Version	Number of Servers	Percent
1.0.8	4	100.00%
Other	0	0.00%
Neon Mail Server (4 servers)
Version	Number of Servers	Percent
3.1.0	2	50.00%
3.1.3	1	25.00%
3.1.2	1	25.00%
Other	0	0.00%
ModusMail (1 servers)
Version	Number of Servers	Percent
4.1.361.21	1	100.00%
Other	0	0.00%
WebSTAR (1 servers)
Version	Number of Servers	Percent
Other	1	100.00%