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	2,405,010	100.0%
Number of Servers that didn't respond	443,253	18.43%
Server didn't open socket	427,414	17.77%
Server didn't provide banner	15,839	0.66%
Server provided banner	1,961,757	81.57%
Server banner identifies software in use	1,136,345	47.25%

As indicated by the above table, of the 2,405,010 servers queried, only 1,136,345 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	601,305	52.92%
Postfix	360,603	31.73%
Sendmail	81,077	7.13%
MailEnable	29,247	2.57%
Microsoft	28,696	2.53%
MDaemon	17,796	1.57%
IMail	4,002	0.35%
CommuniGate Pro	2,490	0.22%
Lotus Domino	2,278	0.20%
WinWebMail	1,870	0.16%
XMail	1,563	0.14%
Qmail Toaster	1,229	0.11%
SurgeSMTP	846	0.07%
Kerio	841	0.07%
Merak	548	0.05%
ArGoSoft	399	0.04%
MagicMail	268	0.02%
OpenSMTPD	237	0.02%
Post.Office	233	0.02%
GroupWise	203	0.02%
Gordano Messaging Suite (GMS)	202	0.02%
Trend Micro	136	0.01%
InterScan VirusWall	69	0.01%
Mirapoint	55	0.00%
VisNetic	47	0.00%
Mercury	23	0.00%
OpenVMS	19	0.00%
Interscan	14	0.00%
Neon Mail Server	12	0.00%
WebSTAR V	12	0.00%
ModusMail	11	0.00%
MessageWall	7	0.00%
NetIQ MailMarshal	4	0.00%
WebSTAR	3	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (601,305 servers)
Version	Number of Servers	Percent
4.85	411,041	68.36%
4.84	67,054	11.15%
4.82	27,230	4.53%
4.80	19,951	3.32%
4.80.1	19,150	3.18%
4.72	17,247	2.87%
4.76	15,886	2.64%
4.69	6,833	1.14%
Other	16,913	2.81%
Postfix (360,603 servers)
Version	Number of Servers	Percent
Other	360,603	100.00%
Sendmail (81,077 servers)
Version	Number of Servers	Percent
8.14.5	17,772	21.92%
8.13.8	16,844	20.78%
8.14.4	14,782	18.23%
8.13.1	9,972	12.30%
8.14.3	5,542	6.84%
8.12.11.20060308	1,980	2.44%
8.14.7	1,837	2.27%
8.14.9	1,718	2.12%
8.13.6.20060614	1,266	1.56%
8.14.2	1,038	1.28%
8.11.6	868	1.07%
8.12.10	862	1.06%
Other	6,596	8.14%
MailEnable (29,247 servers)
Version	Number of Servers	Percent
6.5--	1,979	6.77%
1.986--	1,961	6.70%
8.60--	1,913	6.54%
8.53--	1,469	5.02%
8.51--	1,074	3.67%
5.10--	999	3.42%
8.60-8.60-	937	3.20%
8.04--	874	2.99%
8.60--8.60	800	2.74%
4.26--	745	2.55%
6.0--	707	2.42%
8.00--	677	2.31%
8.50--	657	2.25%
7.06--	631	2.16%
7.07--	423	1.45%
8.55--	419	1.43%
6.88-6.88-	404	1.38%
7.0--	398	1.36%
7.50--	379	1.30%
1.981--	379	1.30%
6.57--	367	1.25%
6.70--	364	1.24%
7.53--	340	1.16%
Other	10,351	35.39%
Microsoft (28,696 servers)
Version	Number of Servers	Percent
6.0.3790.4675	21,407	74.60%
6.0.3790.3959	2,286	7.97%
7.5.7601.17514	1,922	6.70%
6.0.3790.1830	660	2.30%
8.5.9600.16384	436	1.52%
7.0.6002.18264	427	1.49%
5.0.2195.7381	307	1.07%
8.0.9200.16384	289	1.01%
Other	962	3.35%
MDaemon (17,796 servers)
Version	Number of Servers	Percent
15.0.3	2,764	15.53%
11.0.3	927	5.21%
11.0.0	823	4.62%
15.0.1	787	4.42%
13.5.1	753	4.23%
13.0.4	739	4.15%
13.0.5	703	3.95%
14.5.3	483	2.71%
14.5.2	475	2.67%
12.5.6	417	2.34%
14.0.3	415	2.33%
10.0.0	412	2.32%
15.0.0	333	1.87%
10.1.2	329	1.85%
13.6.3	327	1.84%
12.5.4	305	1.71%
10.1.1	284	1.60%
14.0.2	275	1.55%
13.6.2	238	1.34%
10.1.0	229	1.29%
9.6.1	218	1.22%
9.6.2	213	1.20%
13.0.2	203	1.14%
13.6.0	199	1.12%
9.6.6	196	1.10%
Other	4,749	26.69%
IMail (4,002 servers)
Version	Number of Servers	Percent
8.22	439	10.97%
12.3.0.100	358	8.95%
12.4.2.27	311	7.77%
9.23	255	6.37%
12.4.1.15	209	5.22%
8.15	206	5.15%
12.5.2.62	188	4.70%
12.5.1.60	173	4.32%
8.05	164	4.10%
12.5.3.93	159	3.97%
12.2.0.235	139	3.47%
11.5	132	3.30%
11.03	114	2.85%
12.5.0.246	104	2.60%
12.4.0.166	78	1.95%
11.02	68	1.70%
10.02	65	1.62%
11.01	65	1.62%
7.07	59	1.47%
12.4.1.9	59	1.47%
7.15	53	1.32%
12.1.0.270	47	1.17%
8.00	47	1.17%
6.06	42	1.05%
Other	468	11.69%
CommuniGate Pro (2,490 servers)
Version	Number of Servers	Percent
5.1.16	258	10.36%
6.0.9	164	6.59%
6.1.2	162	6.51%
6.0.11	126	5.06%
5.2.20	91	3.65%
6.0.10	83	3.33%
5.4.11	80	3.21%
6.0.7	64	2.57%
6.1.4	60	2.41%
6.0.8	56	2.25%
5.3.15	56	2.25%
5.3.13	54	2.17%
5.2.3	50	2.01%
4.1.8	49	1.97%
6.0.5	49	1.97%
5.0.14	46	1.85%
6.1.1	33	1.33%
5.4.10	31	1.24%
4.2.10	30	1.20%
5.2.16	30	1.20%
5.4.8	30	1.20%
5.4.6	29	1.16%
5.1.12	28	1.12%
6.0.1	26	1.04%
5.4.4	26	1.04%
5.4.1	26	1.04%
Other	753	30.24%
Lotus Domino (2,278 servers)
Version	Number of Servers	Percent
8.5.3	331	14.53%
8.5.3FP6	297	13.04%
8.5.2	116	5.09%
8.5.1	90	3.95%
8.5.3FP3	79	3.47%
7.0.2	72	3.16%
8.5.2FP4	71	3.12%
8.5.3FP2	70	3.07%
8.5	67	2.94%
8.5.3FP4	63	2.77%
8.5.3FP1	56	2.46%
8.5.2FP3	56	2.46%
8.5.3FP5	56	2.46%
8.5.2FP2	52	2.28%
7.0.3	51	2.24%
7.0	39	1.71%
7.0.1	35	1.54%
8.0.1	35	1.54%
8.5.1FP5	34	1.49%
8.0	32	1.40%
8.0.2	29	1.27%
6.5.1	29	1.27%
8.5.2FP1	29	1.27%
6.5.4	26	1.14%
6.5.3	24	1.05%
7.0.4	24	1.05%
Other	415	18.22%
WinWebMail (1,870 servers)
Version	Number of Servers	Percent
3.8.1.3	312	16.68%
3.9.0.7	280	14.97%
3.7.6.1	155	8.29%
3.8.0.1	145	7.75%
3.9.0.1	130	6.95%
3.8.1.5	104	5.56%
3.8.1.1	99	5.29%
3.7.3.1	94	5.03%
3.8.5.1	91	4.87%
3.8.6.1	76	4.06%
3.7.7.3	70	3.74%
3.7.1.1	53	2.83%
3.8.2.1	47	2.51%
3.8.3.1	30	1.60%
3.7.5.1	26	1.39%
3.8.3.3	24	1.28%
3.9.0.5	22	1.18%
3.7.0.5	21	1.12%
Other	91	4.87%
XMail (1,563 servers)
Version	Number of Servers	Percent
1.27	596	38.13%
1.22	451	28.85%
1.25	183	11.71%
1.26	126	8.06%
1.24	71	4.54%
1.21	36	2.30%
1.23	22	1.41%
1.20	20	1.28%
Other	58	3.71%
Qmail Toaster (1,229 servers)
Version	Number of Servers	Percent
1.3	1,157	94.14%
1.2	23	1.87%
1.03.5	15	1.22%
Other	34	2.77%
SurgeSMTP (846 servers)
Version	Number of Servers	Percent
6.9c-1	200	23.64%
6.5a2-2	115	13.59%
6.7c-1	94	11.11%
6.5a-1	52	6.15%
6.3c2-2	32	3.78%
5.3h2-2	24	2.84%
6.4a-1	24	2.84%
3.9e-1	23	2.72%
5.2a-1	22	2.60%
3.8k4-4	20	2.36%
6.9d-30	17	2.01%
6.9d-29	15	1.77%
6.1c-1	13	1.54%
4.0u4-4	11	1.30%
6.0a5-5	9	1.06%
Other	175	20.69%
Kerio (841 servers)
Version	Number of Servers	Percent
6.7.3	176	20.93%
6.7.0	85	10.11%
6.6.2	76	9.04%
6.5.2	57	6.78%
6.5.0	53	6.30%
6.7.2	48	5.71%
6.4.1	45	5.35%
6.6.1	38	4.52%
6.7.1	37	4.40%
6.3.1	37	4.40%
6.5.1	31	3.69%
6.3.0	21	2.50%
6.4.2	19	2.26%
6.4.0	18	2.14%
6.6.0	14	1.66%
6.2.0	10	1.19%
6.1.3	10	1.19%
Other	66	7.85%
Merak (548 servers)
Version	Number of Servers	Percent
8.0.3	176	32.12%
8.9.1	77	14.05%
8.5.0	43	7.85%
8.3.8	31	5.66%
7.5.2	30	5.47%
7.4.5	23	4.20%
7.6.4	22	4.01%
7.6.1	13	2.37%
8.3.15	12	2.19%
7.4.2	10	1.82%
7.0.1	10	1.82%
8.9.0	8	1.46%
7.2.0	8	1.46%
8.2.4	7	1.28%
Other	78	14.23%
ArGoSoft (399 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	119	29.82%
1.8 (1.8.9.3)	54	13.53%
1.8 (1.8.9.5)	52	13.03%
1.8 (1.8.9.1)	37	9.27%
1.8 (1.8.8.7)	23	5.76%
1.8 (1.8.8.8)	20	5.01%
1.8 (1.8.9.2)	12	3.01%
1.8 (1.8.9.4)	11	2.76%
1.8 (1.8.7.3)	7	1.75%
1.8 (1.8.6.0)	7	1.75%
1.8 (1.8.8.9)	5	1.25%
1.8 (1.8.8.2)	4	1.00%
1.8 (1.8.9.0)	4	1.00%
1.8 (1.8.8.4)	4	1.00%
Other	40	10.03%
MagicMail (268 servers)
Version	Number of Servers	Percent
Other	268	100.00%
OpenSMTPD (237 servers)
Version	Number of Servers	Percent
Other	237	100.00%
Post.Office (233 servers)
Version	Number of Servers	Percent
4.2.2	44	18.88%
3.5.3	33	14.16%
4.1.2.4	29	12.45%
4.3	16	6.87%
4.1.0.2	12	5.15%
4.2.1.3	10	4.29%
4.1.1	9	3.86%
3.9.2.3	8	3.43%
4.0.1	8	3.43%
3.1.2J	6	2.58%
4.2.1.1	6	2.58%
3.5.3J	5	2.15%
4.2	5	2.15%
4.1.0.3	4	1.72%
3.8.7.4	4	1.72%
3.9.2	3	1.29%
4.1.2.3	3	1.29%
3.1.2	3	1.29%
3.5.1	3	1.29%
3.9.1	3	1.29%
Other	19	8.15%
GroupWise (203 servers)
Version	Number of Servers	Percent
14.0.1	39	19.21%
6.5.7	21	10.34%
7.0.3	19	9.36%
8.0.3	18	8.87%
8.0.2	16	7.88%
14.0.0	13	6.40%
7.0.2	12	5.91%
7.0.4	9	4.43%
12.0.2	8	3.94%
12.0.3	6	2.96%
6.5.6	6	2.96%
6.0.4	5	2.46%
7.0.1	4	1.97%
6.5.4	3	1.48%
8.0.0	3	1.48%
14.2.0	3	1.48%
Other	18	8.87%
Gordano Messaging Suite (GMS) (202 servers)
Version	Number of Servers	Percent
Other	202	100.00%
Trend Micro (136 servers)
Version	Number of Servers	Percent
5.7	49	36.03%
5.5	26	19.12%
5.18	25	18.38%
7.0	13	9.56%
7.1	10	7.35%
8.5	4	2.94%
3.53	3	2.21%
7.5	2	1.47%
Other	4	2.94%
InterScan VirusWall (69 servers)
Version	Number of Servers	Percent
Other	69	100.00%
Mirapoint (55 servers)
Version	Number of Servers	Percent
4.3.5-GA	9	16.36%
4.4.3-GA	6	10.91%
4.3.6-GA	5	9.09%
4.4.2a-FCS	4	7.27%
4.4.5-GA	4	7.27%
4.4.6-GA	4	7.27%
4.4.4-GA	3	5.45%
4.1.9-GA	2	3.64%
4.3.3-GA	2	3.64%
3.10.10a-GA	2	3.64%
4.4.5a-GA	2	3.64%
4.1.10-GA	2	3.64%
4.1.5-GA	2	3.64%
3.8.4-GA	2	3.64%
3.10.4-GA	1	1.82%
4.1.6-GA	1	1.82%
3.7.5a-GA	1	1.82%
3.8.7a	1	1.82%
3.10.2-GA	1	1.82%
3.8.5-GA	1	1.82%
Other	0	0.00%
VisNetic (47 servers)
Version	Number of Servers	Percent
9.3.2.0	9	19.15%
9.1.4.1	6	12.77%
6.2.2.0	4	8.51%
5.0.2.3	4	8.51%
8.5.0.8	4	8.51%
9.1.4.0	2	4.26%
7.2.4.1	2	4.26%
7.6.1.0	2	4.26%
5.8.6.6	2	4.26%
5.3.5.0	2	4.26%
8.0.3	1	2.13%
8.3.0.1	1	2.13%
8.5.0.5	1	2.13%
5.5.8.3	1	2.13%
5.4.5.4	1	2.13%
8.0.3.1	1	2.13%
5.4.5	1	2.13%
5.0.2.0	1	2.13%
7.2.4.0	1	2.13%
9.1.4.1 provided by Techfount Systems Pte Ltd	1	2.13%
Other	0	0.00%
Mercury (23 servers)
Version	Number of Servers	Percent
3.32	11	47.83%
1.48	11	47.83%
3.21	1	4.35%
Other	0	0.00%
OpenVMS (19 servers)
Version	Number of Servers	Percent
8.3	8	42.11%
7.3	6	31.58%
8.4	5	26.32%
Other	0	0.00%
Interscan (14 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	3	21.43%
3.81-Build_1084	2	14.29%
3.81-Build_1022	2	14.29%
3.55 (build 1029)	2	14.29%
3.5 (build 1294)	1	7.14%
3.8-Build_3013	1	7.14%
3.53 (build 2013)	1	7.14%
3.53 (build 2017)	1	7.14%
3.8-Build_1080	1	7.14%
Other	0	0.00%
Neon Mail Server (12 servers)
Version	Number of Servers	Percent
3.0.7	4	33.33%
3.1.4	2	16.67%
3.1.0	2	16.67%
3.1.2	1	8.33%
3.1.3	1	8.33%
3.0.6	1	8.33%
3.0.8	1	8.33%
Other	0	0.00%
WebSTAR V (12 servers)
Version	Number of Servers	Percent
5.4.1	6	50.00%
5.4.0	4	33.33%
5.3.3	1	8.33%
5.3.4	1	8.33%
Other	0	0.00%
ModusMail (11 servers)
Version	Number of Servers	Percent
4.35.477.0	7	63.64%
4.1.361.21	1	9.09%
3.2.315.0	1	9.09%
4.35.477.8	1	9.09%
3.1.302.0	1	9.09%
Other	0	0.00%
MessageWall (7 servers)
Version	Number of Servers	Percent
1.0.8	7	100.00%
Other	0	0.00%
NetIQ MailMarshal (4 servers)
Version	Number of Servers	Percent
5.5.6.5	2	50.00%
5.5.4.17	1	25.00%
5.5.6.7	1	25.00%
Other	0	0.00%
WebSTAR (3 servers)
Version	Number of Servers	Percent
Other	3	100.00%