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	2,410,576	100.0%
Number of Servers that didn't respond	419,174	17.39%
Server didn't open socket	410,196	17.02%
Server didn't provide banner	8,978	0.37%
Server provided banner	1,991,402	82.61%
Server banner identifies software in use	1,122,995	46.59%

As indicated by the above table, of the 2,410,576 servers queried, only 1,122,995 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	584,431	52.04%
Postfix	330,037	29.39%
Sendmail	94,056	8.38%
Microsoft	44,537	3.97%
MailEnable	30,851	2.75%
MDaemon	18,666	1.66%
IMail	4,830	0.43%
Lotus Domino	2,881	0.26%
CommuniGate Pro	2,719	0.24%
WinWebMail	2,061	0.18%
XMail	1,729	0.15%
Qmail Toaster	1,331	0.12%
Kerio	1,015	0.09%
SurgeSMTP	945	0.08%
Merak	744	0.07%
ArGoSoft	460	0.04%
MagicMail	299	0.03%
Post.Office	268	0.02%
GroupWise	261	0.02%
Gordano Messaging Suite (GMS)	232	0.02%
Trend Micro	175	0.02%
OpenSMTPD	112	0.01%
InterScan VirusWall	82	0.01%
Mirapoint	71	0.01%
VisNetic	58	0.01%
Mercury	27	0.00%
Interscan	21	0.00%
OpenVMS	20	0.00%
WebSTAR V	20	0.00%
NetIQ MailMarshal	15	0.00%
Neon Mail Server	15	0.00%
ModusMail	10	0.00%
MessageWall	8	0.00%
WebSTAR	5	0.00%
MAILsweeper	3	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (584,431 servers)
Version	Number of Servers	Percent
4.82	426,354	72.95%
4.80.1	59,050	10.10%
4.80	25,030	4.28%
4.76	18,831	3.22%
4.72	16,211	2.77%
4.69	10,663	1.82%
4.77	7,682	1.31%
Other	20,610	3.53%
Postfix (330,037 servers)
Version	Number of Servers	Percent
Other	330,037	100.00%
Sendmail (94,056 servers)
Version	Number of Servers	Percent
8.13.8	21,387	22.74%
8.14.5	19,107	20.31%
8.14.4	14,929	15.87%
8.13.1	12,357	13.14%
8.14.3	7,197	7.65%
8.12.11.20060308	2,723	2.90%
8.13.6.20060614	2,454	2.61%
8.14.7	1,711	1.82%
8.14.2	1,356	1.44%
8.11.6	1,192	1.27%
8.12.10	1,126	1.20%
8.14.1	1,002	1.07%
Other	7,515	7.99%
Microsoft (44,537 servers)
Version	Number of Servers	Percent
6.0.3790.4675	34,847	78.24%
6.0.3790.3959	3,838	8.62%
7.5.7601.17514	2,151	4.83%
6.0.3790.1830	1,066	2.39%
7.0.6002.18264	461	1.04%
5.0.2195.7381	446	1.00%
Other	1,728	3.88%
MailEnable (30,851 servers)
Version	Number of Servers	Percent
1.986--	2,955	9.58%
6.5--	2,313	7.50%
5.10--	1,458	4.73%
8.04--	1,068	3.46%
4.26--	1,066	3.46%
6.0--	1,062	3.44%
8.00--	905	2.93%
7.06--	847	2.75%
8.51--	823	2.67%
8.50--	746	2.42%
1.981--	576	1.87%
7.50--	567	1.84%
7.07--	548	1.78%
7.0--	499	1.62%
7.53--	497	1.61%
6.57--	491	1.59%
6.70--	468	1.52%
8.51--8.51	421	1.36%
6.03--	354	1.15%
Other	13,187	42.74%
MDaemon (18,666 servers)
Version	Number of Servers	Percent
14.0.3	1,860	9.96%
14.0.2	1,834	9.83%
11.0.3	1,116	5.98%
11.0.0	1,001	5.36%
13.0.4	902	4.83%
13.0.5	785	4.21%
13.5.1	657	3.52%
13.6.2	583	3.12%
14.0.0	554	2.97%
12.5.6	497	2.66%
10.0.0	494	2.65%
10.1.2	405	2.17%
13.6.0	402	2.15%
13.5.2	365	1.96%
10.1.1	355	1.90%
12.5.4	335	1.79%
13.0.3	302	1.62%
13.6.1	298	1.60%
9.6.1	293	1.57%
10.1.0	291	1.56%
13.0.2	280	1.50%
9.6.6	257	1.38%
9.6.2	250	1.34%
Other	4,550	24.38%
IMail (4,830 servers)
Version	Number of Servers	Percent
12.3.0.100	666	13.79%
8.22	538	11.14%
12.2.0.235	459	9.50%
11.5	299	6.19%
9.23	296	6.13%
12.4.1.15	278	5.76%
8.15	254	5.26%
8.05	217	4.49%
12.4.0.166	198	4.10%
11.03	144	2.98%
12.4.1.9	140	2.90%
11.01	121	2.51%
12.1.0.270	110	2.28%
10.02	107	2.22%
11.02	95	1.97%
7.15	86	1.78%
6.06	83	1.72%
7.07	64	1.33%
12.2.0.169	61	1.26%
10.01	52	1.08%
Other	562	11.64%
Lotus Domino (2,881 servers)
Version	Number of Servers	Percent
8.5.3	464	16.11%
8.5.3FP6	164	5.69%
8.5.2	154	5.35%
8.5.3FP3	145	5.03%
8.5.3FP2	122	4.23%
8.5.3FP4	116	4.03%
8.5.1	107	3.71%
7.0.2	105	3.64%
8.5.3FP5	94	3.26%
8.5.2FP2	92	3.19%
8.5	86	2.99%
8.5.2FP3	80	2.78%
8.5.3FP1	78	2.71%
8.5.2FP4	74	2.57%
7.0.3	61	2.12%
8.5.1FP5	53	1.84%
7.0	45	1.56%
7.0.1	42	1.46%
6.5.3	40	1.39%
6.5.1	39	1.35%
8.0.2	39	1.35%
8.0.1	39	1.35%
8.5.2FP1	37	1.28%
6.5.4	37	1.28%
8.0	37	1.28%
6.5	30	1.04%
Other	501	17.39%
CommuniGate Pro (2,719 servers)
Version	Number of Servers	Percent
6.0.9	303	11.14%
5.1.16	275	10.11%
6.0.7	135	4.97%
6.0.8	131	4.82%
5.2.20	92	3.38%
4.1.8	87	3.20%
6.0.5	78	2.87%
5.4.11	69	2.54%
5.3.15	60	2.21%
5.3.13	59	2.17%
5.0.14	56	2.06%
4.2.10	52	1.91%
5.2.3	49	1.80%
5.2.19	46	1.69%
5.4.4	44	1.62%
5.1.12	43	1.58%
5.4.8	42	1.54%
5.2.16	37	1.36%
6.0.1	36	1.32%
5.4.1	36	1.32%
6.0.6	34	1.25%
5.4.6	34	1.25%
5.4.10	34	1.25%
5.4.5	31	1.14%
6.0.4	28	1.03%
Other	828	30.45%
WinWebMail (2,061 servers)
Version	Number of Servers	Percent
3.8.1.3	350	16.98%
3.8.0.1	204	9.90%
3.7.6.1	186	9.02%
3.9.0.1	161	7.81%
3.8.1.5	135	6.55%
3.8.1.1	127	6.16%
3.7.3.1	120	5.82%
3.8.6.1	118	5.73%
3.8.5.1	115	5.58%
3.7.7.3	91	4.42%
3.8.2.1	70	3.40%
3.7.1.1	59	2.86%
3.9.0.5	55	2.67%
3.8.3.1	39	1.89%
3.7.5.1	37	1.80%
3.8.3.3	36	1.75%
3.7.0.5	23	1.12%
3.7.0.7	22	1.07%
3.7.0.3	22	1.07%
3.6.3.1	21	1.02%
Other	70	3.40%
XMail (1,729 servers)
Version	Number of Servers	Percent
1.27	584	33.78%
1.22	470	27.18%
1.25	242	14.00%
1.26	160	9.25%
1.24	100	5.78%
1.21	47	2.72%
1.23	29	1.68%
1.20	20	1.16%
1.17	19	1.10%
Other	58	3.35%
Qmail Toaster (1,331 servers)
Version	Number of Servers	Percent
1.3	1,257	94.44%
1.2	35	2.63%
Other	39	2.93%
Kerio (1,015 servers)
Version	Number of Servers	Percent
6.7.3	191	18.82%
6.7.0	105	10.34%
6.6.2	88	8.67%
6.5.0	75	7.39%
6.5.2	72	7.09%
6.7.2	68	6.70%
6.4.1	57	5.62%
6.6.1	46	4.53%
6.3.1	46	4.53%
6.7.1	42	4.14%
6.5.1	31	3.05%
6.4.0	27	2.66%
6.3.0	26	2.56%
6.4.2	23	2.27%
6.6.0	18	1.77%
6.2.0	11	1.08%
Other	89	8.77%
SurgeSMTP (945 servers)
Version	Number of Servers	Percent
6.5a2-2	251	26.56%
6.5a-1	95	10.05%
6.3c2-2	74	7.83%
6.4a-1	69	7.30%
5.2a-1	46	4.87%
5.3h2-2	37	3.92%
6.1c-1	35	3.70%
3.9e-1	27	2.86%
6.7a-1	22	2.33%
3.8k4-4	21	2.22%
6.0a5-5	18	1.90%
4.0u4-4	16	1.69%
6.7b-13	14	1.48%
3.9h-18	10	1.06%
Other	210	22.22%
Merak (744 servers)
Version	Number of Servers	Percent
8.0.3	264	35.48%
8.9.1	99	13.31%
8.5.0	52	6.99%
8.3.8	39	5.24%
7.4.5	37	4.97%
7.5.2	37	4.97%
7.6.4	32	4.30%
7.6.1	15	2.02%
8.3.15	12	1.61%
7.4.2	11	1.48%
8.9.0	10	1.34%
7.2.0	10	1.34%
9.0.0	10	1.34%
8.2.4	9	1.21%
7.0.1	9	1.21%
Other	98	13.17%
ArGoSoft (460 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	123	26.74%
1.8 (1.8.9.5)	66	14.35%
1.8 (1.8.9.3)	62	13.48%
1.8 (1.8.9.1)	45	9.78%
1.8 (1.8.8.7)	28	6.09%
1.8 (1.8.8.8)	25	5.43%
1.8 (1.8.9.2)	19	4.13%
1.8 (1.8.9.4)	12	2.61%
1.8 (1.8.6.0)	10	2.17%
1.8 (1.8.7.3)	7	1.52%
1.8 (1.8.8.9)	6	1.30%
Other	57	12.39%
MagicMail (299 servers)
Version	Number of Servers	Percent
Other	299	100.00%
Post.Office (268 servers)
Version	Number of Servers	Percent
3.5.3	39	14.55%
4.1.2.4	35	13.06%
4.2.2	32	11.94%
4.1.0.2	16	5.97%
4.1.1	14	5.22%
4.0.1	12	4.48%
3.5.3J	9	3.36%
3.9.2.3	9	3.36%
4.1.0.3	8	2.99%
4.2.1.3	8	2.99%
4.2	6	2.24%
3.1.2J	6	2.24%
4.2.1.1	6	2.24%
4.1.2.3	5	1.87%
3.1.2	4	1.49%
3.5.4	4	1.49%
3.9.2	4	1.49%
3.8.7.4	4	1.49%
3.9.1	4	1.49%
3.9.1.3	3	1.12%
4.2.1.2	3	1.12%
3.9.2.1	3	1.12%
3.5.2	3	1.12%
3.9.1.2	3	1.12%
4.1.0.4	3	1.12%
4.1.2.2	3	1.12%
3.5.1	3	1.12%
Other	19	7.09%
GroupWise (261 servers)
Version	Number of Servers	Percent
7.0.3	41	15.71%
8.0.2	30	11.49%
6.5.7	27	10.34%
7.0.4	22	8.43%
8.0.3	21	8.05%
12.0.2	19	7.28%
14.0.0	18	6.90%
7.0.2	16	6.13%
6.5.4	11	4.21%
6.5.6	10	3.83%
7.0.1	6	2.30%
6.5.5	5	1.92%
6.0.4	5	1.92%
8.0.1	4	1.53%
12.0.1	4	1.53%
8.0.0	4	1.53%
12.0.0	3	1.15%
Other	15	5.75%
Gordano Messaging Suite (GMS) (232 servers)
Version	Number of Servers	Percent
Other	232	100.00%
Trend Micro (175 servers)
Version	Number of Servers	Percent
5.7	66	37.71%
5.5	38	21.71%
5.18	34	19.43%
7.0	13	7.43%
7.1	10	5.71%
8.5	4	2.29%
3.53	2	1.14%
5.15	2	1.14%
Other	6	3.43%
OpenSMTPD (112 servers)
Version	Number of Servers	Percent
Other	112	100.00%
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	10	14.08%
4.4.3-GA	8	11.27%
4.3.6-GA	7	9.86%
4.4.4-GA	6	8.45%
4.4.2a-FCS	4	5.63%
4.2.3-GA	4	5.63%
4.1.10-GA	4	5.63%
3.10.10a-GA	3	4.23%
4.3.7-GA	3	4.23%
3.10.4-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%
3.4.6-GR	1	1.41%
4.2.4-GA	1	1.41%
4.1.6-GA	1	1.41%
3.7.5a-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 (58 servers)
Version	Number of Servers	Percent
9.3.2.0	17	29.31%
9.1.4.1	5	8.62%
8.0.3.1	4	6.90%
7.2.4.1	4	6.90%
8.5.0.8	4	6.90%
6.2.2.0	3	5.17%
5.5.8.3	3	5.17%
8.3.5.0	2	3.45%
5.0.2.3	2	3.45%
9.1.4.0	2	3.45%
7.6.1.0	2	3.45%
5.8.6.6	2	3.45%
5.3.5.0	2	3.45%
8.0.3	1	1.72%
8.3.0.1	1	1.72%
8.5.0.5	1	1.72%
8.0.3.0	1	1.72%
5.0.2.0	1	1.72%
9.1.4.1 provided by Techfount Systems Pte Ltd	1	1.72%
Other	0	0.00%
Mercury (27 servers)
Version	Number of Servers	Percent
3.32	12	44.44%
1.48	12	44.44%
3.21	1	3.70%
3.21c	1	3.70%
4.x	1	3.70%
Other	0	0.00%
Interscan (21 servers)
Version	Number of Servers	Percent
3.81-Build_1022	4	19.05%
3.81-Build_1084	3	14.29%
3.55 (build 1016)	3	14.29%
3.8-Build_3013	2	9.52%
3.55 (build 1029)	2	9.52%
3.53 (build 1493)	2	9.52%
3.5 (build 1294)	1	4.76%
3.55 (build 1020)	1	4.76%
3.53 (build 2013)	1	4.76%
3.53 (build 2017)	1	4.76%
3.8-Build_1080	1	4.76%
Other	0	0.00%
OpenVMS (20 servers)
Version	Number of Servers	Percent
8.3	8	40.00%
8.4	7	35.00%
7.3	4	20.00%
8.2	1	5.00%
Other	0	0.00%
WebSTAR V (20 servers)
Version	Number of Servers	Percent
5.4.1	9	45.00%
5.4.0	7	35.00%
5.3.4	3	15.00%
5.3.3	1	5.00%
Other	0	0.00%
NetIQ MailMarshal (15 servers)
Version	Number of Servers	Percent
6.0.3.8	10	66.67%
5.5.6.5	2	13.33%
5.5.5.6	1	6.67%
5.5.4.17	1	6.67%
5.5.6.7	1	6.67%
Other	0	0.00%
Neon Mail Server (15 servers)
Version	Number of Servers	Percent
3.0.7	4	26.67%
3.1.4	3	20.00%
3.1.2	2	13.33%
3.1.0	2	13.33%
3.1.3	1	6.67%
3.0.6	1	6.67%
3.0.8	1	6.67%
3.0.9	1	6.67%
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 (8 servers)
Version	Number of Servers	Percent
1.0.8	7	87.50%
1.0.6	1	12.50%
Other	0	0.00%
WebSTAR (5 servers)
Version	Number of Servers	Percent
Other	5	100.00%
MAILsweeper (3 servers)
Version	Number of Servers	Percent
4.3.17.0	2	66.67%
4.3.20.0	1	33.33%
Other	0	0.00%