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	2,456,033	100.0%
Number of Servers that didn't respond	439,504	17.89%
Server didn't open socket	429,914	17.50%
Server didn't provide banner	9,590	0.39%
Server provided banner	2,016,529	82.11%
Server banner identifies software in use	1,136,972	46.29%

As indicated by the above table, of the 2,456,033 servers queried, only 1,136,972 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	591,717	52.04%
Postfix	346,053	30.44%
Sendmail	90,986	8.00%
Microsoft	39,034	3.43%
MailEnable	30,404	2.67%
MDaemon	18,783	1.65%
IMail	4,669	0.41%
Lotus Domino	2,795	0.25%
CommuniGate Pro	2,713	0.24%
WinWebMail	2,161	0.19%
XMail	1,690	0.15%
Qmail Toaster	1,356	0.12%
Kerio	964	0.08%
SurgeSMTP	885	0.08%
Merak	671	0.06%
ArGoSoft	406	0.04%
MagicMail	274	0.02%
Post.Office	257	0.02%
GroupWise	257	0.02%
Gordano Messaging Suite (GMS)	220	0.02%
OpenSMTPD	177	0.02%
Trend Micro	164	0.01%
InterScan VirusWall	82	0.01%
Mirapoint	71	0.01%
VisNetic	53	0.00%
Mercury	26	0.00%
Interscan	22	0.00%
OpenVMS	18	0.00%
WebSTAR V	16	0.00%
Neon Mail Server	14	0.00%
NetIQ MailMarshal	10	0.00%
ModusMail	10	0.00%
MessageWall	7	0.00%
MAILsweeper	4	0.00%
WebSTAR	3	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (591,717 servers)
Version	Number of Servers	Percent
4.82	291,691	49.30%
4.84	187,827	31.74%
4.80.1	23,026	3.89%
4.80	22,798	3.85%
4.76	19,004	3.21%
4.72	16,690	2.82%
4.69	9,286	1.57%
4.77	6,192	1.05%
Other	15,203	2.57%
Postfix (346,053 servers)
Version	Number of Servers	Percent
Other	346,053	100.00%
Sendmail (90,986 servers)
Version	Number of Servers	Percent
8.13.8	20,263	22.27%
8.14.5	18,786	20.65%
8.14.4	15,054	16.55%
8.13.1	11,686	12.84%
8.14.3	6,570	7.22%
8.12.11.20060308	2,352	2.59%
8.13.6.20060614	2,194	2.41%
8.14.7	1,996	2.19%
8.14.2	1,260	1.38%
8.14.9	1,225	1.35%
8.11.6	1,092	1.20%
8.12.10	1,031	1.13%
8.14.1	921	1.01%
Other	6,556	7.21%
Microsoft (39,034 servers)
Version	Number of Servers	Percent
6.0.3790.4675	29,999	76.85%
6.0.3790.3959	3,276	8.39%
7.5.7601.17514	2,319	5.94%
6.0.3790.1830	882	2.26%
7.0.6002.18264	454	1.16%
5.0.2195.7381	412	1.06%
Other	1,692	4.33%
MailEnable (30,404 servers)
Version	Number of Servers	Percent
1.986--	2,585	8.50%
6.5--	2,187	7.19%
5.10--	1,308	4.30%
8.04--	1,061	3.49%
8.51--	967	3.18%
4.26--	947	3.11%
6.0--	924	3.04%
8.00--	814	2.68%
7.06--	813	2.67%
8.50--	787	2.59%
8.55--	602	1.98%
8.53--	565	1.86%
7.07--	524	1.72%
1.981--	485	1.60%
7.50--	476	1.57%
7.0--	471	1.55%
6.57--	455	1.50%
7.53--	445	1.46%
6.70--	432	1.42%
8.55--8.55	363	1.19%
Other	13,193	43.39%
MDaemon (18,783 servers)
Version	Number of Servers	Percent
14.5.2	1,830	9.74%
14.0.3	1,313	6.99%
11.0.3	1,050	5.59%
11.0.0	947	5.04%
13.0.4	867	4.62%
13.5.1	786	4.18%
13.0.5	782	4.16%
14.0.2	697	3.71%
14.5.0	613	3.26%
14.5.1	567	3.02%
10.0.0	488	2.60%
12.5.6	480	2.56%
13.6.2	381	2.03%
10.1.2	380	2.02%
12.5.4	343	1.83%
10.1.1	329	1.75%
13.6.0	313	1.67%
14.0.0	283	1.51%
13.5.2	277	1.47%
10.1.0	275	1.46%
9.6.1	273	1.45%
13.0.3	252	1.34%
9.6.6	251	1.34%
13.0.2	247	1.32%
9.6.2	242	1.29%
13.6.1	215	1.14%
Other	4,302	22.90%
IMail (4,669 servers)
Version	Number of Servers	Percent
12.3.0.100	571	12.23%
8.22	539	11.54%
12.4.2.27	365	7.82%
9.23	295	6.32%
12.2.0.235	287	6.15%
11.5	254	5.44%
8.15	224	4.80%
12.4.1.15	214	4.58%
8.05	193	4.13%
12.5.0.246	193	4.13%
11.01	135	2.89%
11.03	134	2.87%
12.4.0.166	130	2.78%
12.4.1.9	92	1.97%
11.02	84	1.80%
7.15	82	1.76%
10.02	74	1.58%
12.1.0.270	72	1.54%
6.06	66	1.41%
7.07	65	1.39%
8.00	57	1.22%
Other	543	11.63%
Lotus Domino (2,795 servers)
Version	Number of Servers	Percent
8.5.3	448	16.03%
8.5.3FP6	244	8.73%
8.5.2	154	5.51%
8.5.3FP3	116	4.15%
8.5.1	112	4.01%
7.0.2	109	3.90%
8.5.3FP2	97	3.47%
8.5.3FP4	89	3.18%
8.5.3FP5	83	2.97%
8.5	80	2.86%
8.5.2FP4	78	2.79%
8.5.2FP2	75	2.68%
8.5.3FP1	72	2.58%
8.5.2FP3	68	2.43%
7.0.3	57	2.04%
8.5.1FP5	48	1.72%
7.0	44	1.57%
6.5.3	39	1.40%
8.0.1	39	1.40%
8.0.2	38	1.36%
8.0	37	1.32%
7.0.1	36	1.29%
6.5.4	35	1.25%
6.5.1	35	1.25%
8.5.2FP1	33	1.18%
6.5	32	1.14%
Other	497	17.78%
CommuniGate Pro (2,713 servers)
Version	Number of Servers	Percent
5.1.16	277	10.21%
6.0.9	265	9.77%
6.0.10	194	7.15%
6.0.7	110	4.05%
6.0.8	97	3.58%
5.2.20	94	3.46%
5.4.11	86	3.17%
4.1.8	77	2.84%
6.0.5	69	2.54%
5.3.13	59	2.17%
5.0.14	55	2.03%
5.2.19	47	1.73%
4.2.10	47	1.73%
5.2.3	46	1.70%
5.1.12	42	1.55%
5.4.4	37	1.36%
5.2.16	36	1.33%
5.3.15	36	1.33%
5.4.1	34	1.25%
6.0.1	33	1.22%
5.4.8	33	1.22%
5.4.10	32	1.18%
5.4.6	32	1.18%
Other	875	32.25%
WinWebMail (2,161 servers)
Version	Number of Servers	Percent
3.8.1.3	384	17.77%
3.8.0.1	197	9.12%
3.7.6.1	186	8.61%
3.9.0.1	163	7.54%
3.9.0.7	162	7.50%
3.8.1.5	128	5.92%
3.8.1.1	116	5.37%
3.7.3.1	113	5.23%
3.8.5.1	112	5.18%
3.8.6.1	107	4.95%
3.7.7.3	91	4.21%
3.7.1.1	67	3.10%
3.8.2.1	59	2.73%
3.8.3.1	39	1.80%
3.7.5.1	38	1.76%
3.9.0.5	35	1.62%
3.8.3.3	27	1.25%
3.7.0.3	24	1.11%
3.7.0.5	22	1.02%
Other	91	4.21%
XMail (1,690 servers)
Version	Number of Servers	Percent
1.27	598	35.38%
1.22	478	28.28%
1.25	224	13.25%
1.26	152	8.99%
1.24	82	4.85%
1.21	42	2.49%
1.23	25	1.48%
1.20	17	1.01%
Other	72	4.26%
Qmail Toaster (1,356 servers)
Version	Number of Servers	Percent
1.3	1,285	94.76%
1.2	30	2.21%
1.03.5	16	1.18%
Other	25	1.84%
Kerio (964 servers)
Version	Number of Servers	Percent
6.7.3	185	19.19%
6.7.0	98	10.17%
6.6.2	91	9.44%
6.5.2	72	7.47%
6.5.0	69	7.16%
6.7.2	58	6.02%
6.4.1	56	5.81%
6.3.1	45	4.67%
6.7.1	42	4.36%
6.6.1	40	4.15%
6.5.1	26	2.70%
6.4.0	24	2.49%
6.3.0	23	2.39%
6.4.2	22	2.28%
6.6.0	16	1.66%
6.2.0	11	1.14%
6.0.10	10	1.04%
6.1.3	10	1.04%
Other	66	6.85%
SurgeSMTP (885 servers)
Version	Number of Servers	Percent
6.5a2-2	180	20.34%
6.7c-1	133	15.03%
6.5a-1	69	7.80%
6.3c2-2	63	7.12%
5.2a-1	34	3.84%
6.4a-1	34	3.84%
5.3h2-2	27	3.05%
3.9e-1	25	2.82%
6.1c-1	21	2.37%
3.8k4-4	21	2.37%
6.8c-1	19	2.15%
6.7f-2	17	1.92%
4.0u4-4	16	1.81%
6.0a5-5	12	1.36%
6.7a-1	10	1.13%
6.8e-1	9	1.02%
Other	195	22.03%
Merak (671 servers)
Version	Number of Servers	Percent
8.0.3	228	33.98%
8.9.1	90	13.41%
8.5.0	48	7.15%
8.3.8	37	5.51%
7.5.2	32	4.77%
7.4.5	31	4.62%
7.6.4	29	4.32%
7.0.1	16	2.38%
7.6.1	13	1.94%
9.0.0	11	1.64%
8.3.15	11	1.64%
8.9.0	10	1.49%
7.2.0	10	1.49%
7.4.2	9	1.34%
8.2.4	9	1.34%
6.2.1	8	1.19%
7.1.6	7	1.04%
Other	72	10.73%
ArGoSoft (406 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	104	25.62%
1.8 (1.8.9.3)	63	15.52%
1.8 (1.8.9.5)	56	13.79%
1.8 (1.8.9.1)	36	8.87%
1.8 (1.8.8.7)	27	6.65%
1.8 (1.8.8.8)	23	5.67%
1.8 (1.8.9.2)	15	3.69%
1.8 (1.8.9.4)	11	2.71%
1.8 (1.8.6.0)	8	1.97%
1.8 (1.8.7.3)	7	1.72%
1.8 (1.8.8.9)	6	1.48%
Other	50	12.32%
MagicMail (274 servers)
Version	Number of Servers	Percent
Other	274	100.00%
Post.Office (257 servers)
Version	Number of Servers	Percent
4.2.2	43	16.73%
3.5.3	36	14.01%
4.1.2.4	34	13.23%
4.1.0.2	14	5.45%
4.1.1	14	5.45%
4.0.1	10	3.89%
3.9.2.3	9	3.50%
4.2.1.3	9	3.50%
3.5.3J	8	3.11%
4.1.0.3	7	2.72%
3.1.2J	7	2.72%
4.2	6	2.33%
4.2.1.1	6	2.33%
3.8.7.4	5	1.95%
3.9.2	4	1.56%
3.1.2	3	1.17%
3.5.2	3	1.17%
4.1.2.3	3	1.17%
3.9.1.2	3	1.17%
4.1.0.4	3	1.17%
4.1.2.2	3	1.17%
3.5.1	3	1.17%
3.9.1	3	1.17%
Other	21	8.17%
GroupWise (257 servers)
Version	Number of Servers	Percent
7.0.3	37	14.40%
8.0.2	28	10.89%
6.5.7	26	10.12%
8.0.3	24	9.34%
7.0.4	19	7.39%
14.0.1	18	7.00%
14.0.0	14	5.45%
7.0.2	12	4.67%
12.0.2	12	4.67%
6.5.4	10	3.89%
6.5.6	10	3.89%
7.0.1	6	2.33%
6.0.4	5	1.95%
12.0.1	4	1.56%
6.5.5	4	1.56%
6.5.2	3	1.17%
8.0.0	3	1.17%
6.5.0	3	1.17%
12.0.0	3	1.17%
12.0.3	3	1.17%
Other	13	5.06%
Gordano Messaging Suite (GMS) (220 servers)
Version	Number of Servers	Percent
Other	220	100.00%
OpenSMTPD (177 servers)
Version	Number of Servers	Percent
Other	177	100.00%
Trend Micro (164 servers)
Version	Number of Servers	Percent
5.7	62	37.80%
5.5	34	20.73%
5.18	31	18.90%
7.0	14	8.54%
7.1	10	6.10%
8.5	4	2.44%
3.53	3	1.83%
Other	6	3.66%
InterScan VirusWall (82 servers)
Version	Number of Servers	Percent
Other	82	100.00%
Mirapoint (71 servers)
Version	Number of Servers	Percent
4.3.5-GA	9	12.68%
4.4.3-GA	7	9.86%
4.4.2a-FCS	5	7.04%
4.3.6-GA	5	7.04%
4.4.5-GA	4	5.63%
4.1.10-GA	4	5.63%
3.10.4-GA	3	4.23%
3.10.10a-GA	3	4.23%
3.8.5-GA	3	4.23%
4.4.4-GA	3	4.23%
4.3.7-GA	3	4.23%
4.4.5a-GA	2	2.82%
4.1.9-GA	2	2.82%
4.3.3-GA	2	2.82%
4.4.4b-GA	2	2.82%
4.1.5-GA	2	2.82%
3.10.7-GA	2	2.82%
4.1.3-GA	1	1.41%
4.2.4-GA	1	1.41%
4.1.6-GA	1	1.41%
3.7.5a-GA	1	1.41%
4.2.3-GA	1	1.41%
3.8.7a	1	1.41%
3.7.3a-GA	1	1.41%
3.8.4-GA	1	1.41%
3.10.2-GA	1	1.41%
4.1.8-GA	1	1.41%
Other	0	0.00%
VisNetic (53 servers)
Version	Number of Servers	Percent
9.3.2.0	14	26.42%
9.1.4.1	6	11.32%
6.2.2.0	4	7.55%
7.2.4.1	4	7.55%
8.5.0.8	4	7.55%
5.8.6.6	3	5.66%
5.0.2.3	2	3.77%
9.1.4.0	2	3.77%
7.6.1.0	2	3.77%
5.5.8.3	2	3.77%
5.3.5.0	2	3.77%
8.3.5.0	1	1.89%
8.0.3	1	1.89%
8.3.0.1	1	1.89%
8.5.0.5	1	1.89%
5.4.5.4	1	1.89%
5.4.5	1	1.89%
5.0.2.0	1	1.89%
9.1.4.1 provided by Techfount Systems Pte Ltd	1	1.89%
Other	0	0.00%
Mercury (26 servers)
Version	Number of Servers	Percent
1.48	14	53.85%
3.32	10	38.46%
3.21	1	3.85%
4.x	1	3.85%
Other	0	0.00%
Interscan (22 servers)
Version	Number of Servers	Percent
3.81-Build_1022	5	22.73%
3.81-Build_1084	3	13.64%
3.55 (build 1016)	3	13.64%
3.55 (build 1029)	3	13.64%
3.53 (build 1493)	2	9.09%
3.5 (build 1294)	1	4.55%
3.8-Build_3013	1	4.55%
3.55 (build 1020)	1	4.55%
3.53 (build 2013)	1	4.55%
3.53 (build 2017)	1	4.55%
3.8-Build_1080	1	4.55%
Other	0	0.00%
OpenVMS (18 servers)
Version	Number of Servers	Percent
8.3	7	38.89%
7.3	6	33.33%
8.4	4	22.22%
8.2	1	5.56%
Other	0	0.00%
WebSTAR V (16 servers)
Version	Number of Servers	Percent
5.4.1	6	37.50%
5.4.0	5	31.25%
5.3.4	3	18.75%
5.3.3	1	6.25%
5.3.2	1	6.25%
Other	0	0.00%
Neon Mail Server (14 servers)
Version	Number of Servers	Percent
3.0.7	4	28.57%
3.1.4	3	21.43%
3.1.2	2	14.29%
3.1.0	2	14.29%
3.1.3	1	7.14%
3.0.6	1	7.14%
3.0.9	1	7.14%
Other	0	0.00%
NetIQ MailMarshal (10 servers)
Version	Number of Servers	Percent
6.0.3.8	5	50.00%
5.5.6.5	2	20.00%
5.5.5.6	1	10.00%
5.5.4.17	1	10.00%
5.5.6.7	1	10.00%
Other	0	0.00%
ModusMail (10 servers)
Version	Number of Servers	Percent
4.35.477.0	6	60.00%
4.1.361.21	1	10.00%
3.2.315.0	1	10.00%
4.35.477.8	1	10.00%
3.1.302.0	1	10.00%
Other	0	0.00%
MessageWall (7 servers)
Version	Number of Servers	Percent
1.0.8	7	100.00%
Other	0	0.00%
MAILsweeper (4 servers)
Version	Number of Servers	Percent
4.3.17.0	2	50.00%
4.3.19.0	1	25.00%
4.3.20.0	1	25.00%
Other	0	0.00%
WebSTAR (3 servers)
Version	Number of Servers	Percent
Other	3	100.00%