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	1,963,734	100.0%
Number of Servers that didn't respond	340,244	17.33%
Server didn't open socket	333,122	16.96%
Server didn't provide banner	7,122	0.36%
Server provided banner	1,623,490	82.67%
Server banner identifies software in use	982,179	50.02%

As indicated by the above table, of the 1,963,734 servers queried, only 982,179 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	542,327	55.22%
Postfix	319,838	32.56%
Sendmail	56,855	5.79%
MailEnable	23,633	2.41%
Microsoft	13,999	1.43%
MDaemon	13,432	1.37%
IMail	2,544	0.26%
CommuniGate Pro	1,932	0.20%
Lotus Domino	1,314	0.13%
WinWebMail	1,294	0.13%
XMail	1,129	0.11%
Qmail Toaster	923	0.09%
SurgeSMTP	690	0.07%
Kerio	547	0.06%
Merak	349	0.04%
OpenSMTPD	250	0.03%
ArGoSoft	244	0.02%
MagicMail	225	0.02%
Post.Office	165	0.02%
Gordano Messaging Suite (GMS)	126	0.01%
GroupWise	119	0.01%
Trend Micro	82	0.01%
Mirapoint	37	0.00%
InterScan VirusWall	36	0.00%
VisNetic	32	0.00%
OpenVMS	12	0.00%
ModusMail	9	0.00%
Mercury	8	0.00%
WebSTAR V	8	0.00%
Interscan	7	0.00%
Neon Mail Server	6	0.00%
MessageWall	4	0.00%
WebSTAR	1	0.00%
NetIQ MailMarshal	1	0.00%
MAILsweeper	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (542,327 servers)
Version	Number of Servers	Percent
4.87	300,862	55.48%
4.86	127,377	23.49%
4.85	25,632	4.73%
4.84	15,592	2.88%
4.80	13,651	2.52%
4.72	12,603	2.32%
4.76	9,948	1.83%
4.82	9,038	1.67%
4.80.1	8,038	1.48%
Other	19,586	3.61%
Postfix (319,838 servers)
Version	Number of Servers	Percent
Other	319,838	100.00%
Sendmail (56,855 servers)
Version	Number of Servers	Percent
8.14.5	13,101	23.04%
8.14.4	11,957	21.03%
8.13.8	10,808	19.01%
8.13.1	6,369	11.20%
8.14.3	3,220	5.66%
8.14.9	1,663	2.92%
8.15.2	1,464	2.57%
8.14.7	1,351	2.38%
8.12.11.20060308	943	1.66%
8.14.2	612	1.08%
Other	5,367	9.44%
MailEnable (23,633 servers)
Version	Number of Servers	Percent
9.00--	2,006	8.49%
8.60--	1,851	7.83%
8.53--	1,282	5.42%
6.5--	1,225	5.18%
1.986--	1,047	4.43%
8.51--	892	3.77%
8.04--	652	2.76%
8.60-8.60-	557	2.36%
5.10--	543	2.30%
8.50--	507	2.15%
8.00--	459	1.94%
4.26--	419	1.77%
6.0--	375	1.59%
7.06--	357	1.51%
9.12--	329	1.39%
7.0--	274	1.16%
7.07--	262	1.11%
9.12--9.12	259	1.10%
9.12-9.12-	252	1.07%
8.55--	238	1.01%
Other	9,847	41.67%
Microsoft (13,999 servers)
Version	Number of Servers	Percent
6.0.3790.4675	9,356	66.83%
7.5.7601.17514	1,347	9.62%
6.0.3790.3959	1,092	7.80%
8.5.9600.16384	573	4.09%
6.0.3790.1830	291	2.08%
7.0.6002.18264	264	1.89%
8.0.9200.16384	226	1.61%
5.0.2195.5329	156	1.11%
5.0.2195.7381	154	1.10%
Other	540	3.86%
MDaemon (13,432 servers)
Version	Number of Servers	Percent
16.0.2	1,798	13.39%
15.5.3	758	5.64%
16.0.1	732	5.45%
15.0.3	626	4.66%
11.0.3	599	4.46%
13.5.1	596	4.44%
11.0.0	535	3.98%
13.0.4	535	3.98%
13.0.5	508	3.78%
13.6.3	331	2.46%
12.5.6	291	2.17%
15.5.2	285	2.12%
12.5.4	258	1.92%
10.0.0	255	1.90%
10.1.2	228	1.70%
14.5.2	224	1.67%
15.5.1	187	1.39%
16.0.0	187	1.39%
10.1.1	168	1.25%
14.0.3	152	1.13%
10.1.0	152	1.13%
9.6.1	142	1.06%
9.6.6	140	1.04%
13.0.2	137	1.02%
Other	3,608	26.86%
IMail (2,544 servers)
Version	Number of Servers	Percent
12.5.4.146	404	15.88%
8.22	246	9.67%
12.5.3.93	243	9.55%
12.4.1.15	185	7.27%
9.23	171	6.72%
8.15	130	5.11%
12.3.0.100	124	4.87%
8.05	107	4.21%
11.03	75	2.95%
11.5	73	2.87%
12.2.0.235	51	2.00%
12.5.3.99	47	1.85%
12.5.1.60	45	1.77%
11.02	43	1.69%
7.07	42	1.65%
12.5.2.62	41	1.61%
10.02	37	1.45%
7.15	35	1.38%
12.4.1.9	33	1.30%
12.1.0.270	31	1.22%
8.00	29	1.14%
Other	352	13.84%
CommuniGate Pro (1,932 servers)
Version	Number of Servers	Percent
5.1.16	202	10.46%
6.1.10	157	8.13%
6.0.11	80	4.14%
6.0.9	74	3.83%
5.4.11	70	3.62%
5.2.20	69	3.57%
6.1.8	69	3.57%
6.1.9	60	3.11%
6.1.7	56	2.90%
6.1.5	51	2.64%
6.1.2	50	2.59%
5.3.13	43	2.23%
5.2.3	39	2.02%
6.0.10	38	1.97%
5.3.15	37	1.92%
5.0.14	37	1.92%
6.1.6	31	1.60%
4.1.8	30	1.55%
6.1.4	27	1.40%
6.0.7	26	1.35%
5.2.16	25	1.29%
5.4.8	23	1.19%
5.1.12	22	1.14%
5.4.6	20	1.04%
Other	596	30.85%
Lotus Domino (1,314 servers)
Version	Number of Servers	Percent
8.5.3FP6	220	16.74%
8.5.3	188	14.31%
8.5.2	56	4.26%
8.5.1	52	3.96%
8.5	49	3.73%
7.0.2	44	3.35%
8.5.2FP4	36	2.74%
8.5.2FP3	36	2.74%
8.5.3FP2	36	2.74%
8.5.3FP3	35	2.66%
8.5.3FP4	34	2.59%
8.5.3FP1	31	2.36%
8.5.2FP2	27	2.05%
7.0.1	26	1.98%
8.5.3FP5	26	1.98%
7.0.3	25	1.90%
8.0.1	24	1.83%
7.0	19	1.45%
8.5.1FP5	18	1.37%
8.0	18	1.37%
6.5.1	17	1.29%
8.0.2	16	1.22%
8.5.2FP1	14	1.07%
6.5.3	14	1.07%
Other	253	19.25%
WinWebMail (1,294 servers)
Version	Number of Servers	Percent
3.9.0.7	288	22.26%
3.8.1.3	221	17.08%
3.7.6.1	94	7.26%
3.9.0.1	88	6.80%
3.8.0.1	87	6.72%
3.8.1.5	66	5.10%
3.7.3.1	59	4.56%
3.8.5.1	58	4.48%
3.8.1.1	55	4.25%
3.7.7.3	47	3.63%
3.8.6.1	42	3.25%
3.7.1.1	33	2.55%
3.8.2.1	31	2.40%
3.8.3.1	22	1.70%
3.7.0.5	16	1.24%
3.9.0.5	16	1.24%
3.7.5.1	16	1.24%
Other	55	4.25%
XMail (1,129 servers)
Version	Number of Servers	Percent
1.27	460	40.74%
1.22	337	29.85%
1.25	113	10.01%
1.26	88	7.79%
1.24	48	4.25%
1.21	26	2.30%
1.23	14	1.24%
Other	43	3.81%
Qmail Toaster (923 servers)
Version	Number of Servers	Percent
1.3	855	92.63%
1.03	20	2.17%
1.2	15	1.63%
Other	33	3.58%
SurgeSMTP (690 servers)
Version	Number of Servers	Percent
7.1e-1	210	30.43%
6.5a2-2	65	9.42%
6.9c-1	51	7.39%
7.0c2-2	39	5.65%
6.7c-1	39	5.65%
6.5a-1	28	4.06%
3.9e-1	21	3.04%
6.3c2-2	19	2.75%
5.2a-1	16	2.32%
6.4a-1	16	2.32%
6.1c-1	14	2.03%
3.8k4-4	11	1.59%
7.1f-32	9	1.30%
7.2a-1	9	1.30%
4.0u4-4	8	1.16%
7.1f-9	8	1.16%
5.3h2-2	7	1.01%
7.1f-46	7	1.01%
Other	113	16.38%
Kerio (547 servers)
Version	Number of Servers	Percent
6.7.3	114	20.84%
6.7.0	51	9.32%
6.6.2	47	8.59%
6.5.2	42	7.68%
6.5.0	36	6.58%
6.7.2	35	6.40%
6.4.1	28	5.12%
6.6.1	25	4.57%
6.3.1	24	4.39%
6.7.1	23	4.20%
6.5.1	18	3.29%
6.3.0	16	2.93%
6.4.0	13	2.38%
6.6.0	9	1.65%
6.1.3	9	1.65%
6.2.0	8	1.46%
6.4.2	7	1.28%
Other	42	7.68%
Merak (349 servers)
Version	Number of Servers	Percent
8.0.3	114	32.66%
8.9.1	54	15.47%
8.5.0	27	7.74%
7.5.2	19	5.44%
7.4.5	17	4.87%
8.3.8	15	4.30%
7.6.1	12	3.44%
7.6.4	11	3.15%
8.3.15	9	2.58%
7.4.2	7	2.01%
7.0.1	7	2.01%
7.2.0	6	1.72%
6.1.0	4	1.15%
8.9.0	4	1.15%
6.0.8	4	1.15%
Other	39	11.17%
OpenSMTPD (250 servers)
Version	Number of Servers	Percent
Other	250	100.00%
ArGoSoft (244 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	80	32.79%
1.8 (1.8.9.5)	35	14.34%
1.8 (1.8.9.3)	25	10.25%
1.8 (1.8.9.1)	23	9.43%
1.8 (1.8.8.8)	12	4.92%
1.8 (1.8.8.7)	8	3.28%
1.8 (1.8.7.3)	6	2.46%
1.8 (1.8.9.2)	6	2.46%
1.8 (1.8.9.4)	4	1.64%
1.8 (1.8.8.9)	4	1.64%
1.8 (1.8.6.0)	4	1.64%
1.8 (1.8.7.6)	3	1.23%
1.8 (1.8.9.0)	3	1.23%
1.8 (1.8.8.2)	3	1.23%
1.8 (1.8.8.4)	3	1.23%
1.8 (1.8.5.9)	3	1.23%
Other	22	9.02%
MagicMail (225 servers)
Version	Number of Servers	Percent
Other	225	100.00%
Post.Office (165 servers)
Version	Number of Servers	Percent
4.2.2	37	22.42%
3.5.3	24	14.55%
4.1.2.4	19	11.52%
4.3	18	10.91%
4.2.1.3	9	5.45%
3.9.2.3	6	3.64%
4.1.1	5	3.03%
4.0.1	4	2.42%
3.1.2J	4	2.42%
4.2.1.1	4	2.42%
3.5.3J	3	1.82%
4.1.0.2	3	1.82%
3.8.7.4	3	1.82%
3.1.2	3	1.82%
3.5.1	3	1.82%
3.5.4	2	1.21%
3.6.2	2	1.21%
4.1.2.3	2	1.21%
4.1.0.3	2	1.21%
3.9.2	2	1.21%
Other	10	6.06%
Gordano Messaging Suite (GMS) (126 servers)
Version	Number of Servers	Percent
Other	126	100.00%
GroupWise (119 servers)
Version	Number of Servers	Percent
14.2.0	28	23.53%
8.0.3	13	10.92%
14.0.1	13	10.92%
7.0.3	8	6.72%
6.5.7	7	5.88%
7.0.4	6	5.04%
14.0.2	6	5.04%
14.0.0	6	5.04%
7.0.2	4	3.36%
8.0.2	4	3.36%
6.0.3	3	2.52%
7.0.1	3	2.52%
8.0.1	2	1.68%
12.0.4	2	1.68%
6.5.4	2	1.68%
12.0.3	2	1.68%
6.0.2	2	1.68%
12.0.2	2	1.68%
Other	6	5.04%
Trend Micro (82 servers)
Version	Number of Servers	Percent
5.7	29	35.37%
5.18	15	18.29%
5.5	14	17.07%
7.0	10	12.20%
7.1	5	6.10%
8.5	3	3.66%
7.5	2	2.44%
3.53	2	2.44%
7.1.	1	1.22%
8	1	1.22%
Other	0	0.00%
Mirapoint (37 servers)
Version	Number of Servers	Percent
4.4.3-GA	6	16.22%
4.3.5-GA	4	10.81%
4.4.5-GA	4	10.81%
4.4.7-GA	4	10.81%
4.4.2a-FCS	3	8.11%
4.3.6-GA	3	8.11%
4.3.3-GA	2	5.41%
3.10.10a-GA	2	5.41%
4.4.4-GA	2	5.41%
4.1.10-GA	2	5.41%
4.1.9-GA	1	2.70%
4.4.5a-GA	1	2.70%
3.7.5a-GA	1	2.70%
3.10.2-GA	1	2.70%
4.4.6-GA	1	2.70%
Other	0	0.00%
InterScan VirusWall (36 servers)
Version	Number of Servers	Percent
Other	36	100.00%
VisNetic (32 servers)
Version	Number of Servers	Percent
9.3.2.0	9	28.12%
5.0.2.3	3	9.38%
9.1.4.1	3	9.38%
6.2.2.0	2	6.25%
5.5.8.3	2	6.25%
8.5.0.8	2	6.25%
8.0.3	1	3.12%
8.3.0.1	1	3.12%
5.8.6.6	1	3.12%
8.5.0.5	1	3.12%
8.0.3.1	1	3.12%
9.1.4.0	1	3.12%
7.6.1.0	1	3.12%
5.0.2.0	1	3.12%
9.1.4.1 provided by Techfount Systems Pte Ltd	1	3.12%
5.3.5.0	1	3.12%
7.2.4.1	1	3.12%
Other	0	0.00%
OpenVMS (12 servers)
Version	Number of Servers	Percent
8.4	5	41.67%
8.3	4	33.33%
7.3	3	25.00%
Other	0	0.00%
ModusMail (9 servers)
Version	Number of Servers	Percent
4.35.477.0	5	55.56%
4.1.361.21	2	22.22%
3.2.315.0	1	11.11%
4.35.477.8	1	11.11%
Other	0	0.00%
Mercury (8 servers)
Version	Number of Servers	Percent
3.32	4	50.00%
1.48	2	25.00%
3.21	1	12.50%
4.x	1	12.50%
Other	0	0.00%
WebSTAR V (8 servers)
Version	Number of Servers	Percent
5.4.1	6	75.00%
5.4.0	2	25.00%
Other	0	0.00%
Interscan (7 servers)
Version	Number of Servers	Percent
3.81-Build_1084	1	14.29%
3.5 (build 1294)	1	14.29%
3.8-Build_3013	1	14.29%
3.8-Build_1080	1	14.29%
3.81-Build_1022	1	14.29%
3.55 (build 1029)	1	14.29%
3.55 (build 1016)	1	14.29%
Other	0	0.00%
Neon Mail Server (6 servers)
Version	Number of Servers	Percent
3.0.7	2	33.33%
3.1.0	2	33.33%
3.1.4	1	16.67%
3.1.2	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%
WebSTAR (1 servers)
Version	Number of Servers	Percent
Other	1	100.00%
NetIQ MailMarshal (1 servers)
Version	Number of Servers	Percent
5.5.6.7	1	100.00%
Other	0	0.00%
MAILsweeper (1 servers)
Version	Number of Servers	Percent
4.3.20.0	1	100.00%
Other	0	0.00%