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	2,464,944	100.0%
Number of Servers that didn't respond	433,774	17.60%
Server didn't open socket	422,783	17.15%
Server didn't provide banner	10,991	0.45%
Server provided banner	2,031,170	82.40%
Server banner identifies software in use	1,110,599	45.06%

As indicated by the above table, of the 2,464,944 servers queried, only 1,110,599 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	527,620	47.51%
Postfix	288,056	25.94%
Sendmail	119,222	10.73%
Microsoft	91,803	8.27%
MailEnable	33,512	3.02%
MDaemon	21,158	1.91%
IMail	7,377	0.66%
Lotus Domino	4,618	0.42%
WinWebMail	3,247	0.29%
CommuniGate Pro	3,179	0.29%
XMail	2,155	0.19%
Qmail Toaster	1,667	0.15%
Kerio	1,552	0.14%
Merak	1,227	0.11%
SurgeSMTP	1,047	0.09%
ArGoSoft	721	0.06%
GroupWise	463	0.04%
Post.Office	377	0.03%
Trend Micro	316	0.03%
MagicMail	315	0.03%
Gordano Messaging Suite (GMS)	312	0.03%
Mirapoint	137	0.01%
VisNetic	124	0.01%
InterScan VirusWall	115	0.01%
Mercury	55	0.00%
Interscan	44	0.00%
NetIQ MailMarshal	31	0.00%
WebSTAR V	29	0.00%
Neon Mail Server	25	0.00%
OpenSMTPD	24	0.00%
OpenVMS	20	0.00%
MessageWall	19	0.00%
WebSTAR	14	0.00%
ModusMail	13	0.00%
MAILsweeper	5	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (527,620 servers)
Version	Number of Servers	Percent
4.80	402,604	76.31%
4.72	24,342	4.61%
4.69	24,209	4.59%
4.77	22,342	4.23%
4.80.1	15,760	2.99%
4.76	14,050	2.66%
4.67	5,382	1.02%
Other	18,931	3.59%
Postfix (288,056 servers)
Version	Number of Servers	Percent
Other	288,056	100.00%
Sendmail (119,222 servers)
Version	Number of Servers	Percent
8.13.8	32,021	26.86%
8.13.1	17,865	14.98%
8.14.3	15,839	13.29%
8.14.5	13,542	11.36%
8.14.4	12,217	10.25%
8.12.11.20060308	4,518	3.79%
8.13.6.20060614	3,498	2.93%
8.14.2	3,194	2.68%
8.11.6	2,154	1.81%
8.12.10	1,888	1.58%
8.14.1	1,803	1.51%
8.13.6	1,597	1.34%
8.12.11.20060614	1,440	1.21%
8.13.7	1,353	1.13%
Other	6,293	5.28%
Microsoft (91,803 servers)
Version	Number of Servers	Percent
6.0.3790.4675	74,219	80.85%
6.0.3790.3959	9,585	10.44%
6.0.3790.1830	2,645	2.88%
7.5.7601.17514	1,855	2.02%
5.0.2195.7381	970	1.06%
Other	2,529	2.75%
MailEnable (33,512 servers)
Version	Number of Servers	Percent
1.986--	6,494	19.38%
5.10--	2,614	7.80%
4.26--	2,110	6.30%
6.5--	1,681	5.02%
6.0--	1,353	4.04%
1.981--	1,139	3.40%
1.983--	695	2.07%
0-3.63-	693	2.07%
5.51--	595	1.78%
3.62--	583	1.74%
6.03--	561	1.67%
6.60--	527	1.57%
6.57--	470	1.40%
5.11--	462	1.38%
6.53--	423	1.26%
0-1.87-	359	1.07%
Other	12,753	38.06%
MDaemon (21,158 servers)
Version	Number of Servers	Percent
13.0.3	2,572	12.16%
13.0.4	1,940	9.17%
11.0.3	1,886	8.91%
11.0.0	1,277	6.04%
12.5.6	957	4.52%
13.0.2	889	4.20%
10.0.0	804	3.80%
10.1.2	689	3.26%
10.1.1	657	3.11%
9.6.1	490	2.32%
12.5.4	445	2.10%
9.6.6	444	2.10%
10.1.0	422	1.99%
12.5.8	342	1.62%
13.0.0	327	1.55%
12.0.3	300	1.42%
9.6.2	296	1.40%
9.5.2	283	1.34%
9.6.5	278	1.31%
12.5.3	268	1.27%
10.0.5	260	1.23%
10.0.2	242	1.14%
13.0.1	240	1.13%
9.5.6	230	1.09%
9.5.1	225	1.06%
Other	4,395	20.77%
IMail (7,377 servers)
Version	Number of Servers	Percent
8.22	1,289	17.47%
11.5	791	10.72%
12.1.0.270	537	7.28%
9.23	432	5.86%
8.15	413	5.60%
11.01	391	5.30%
12.2.0.235	391	5.30%
11.03	386	5.23%
12.2.0.169	345	4.68%
8.05	274	3.71%
10.02	220	2.98%
7.07	155	2.10%
12.0.0.384	139	1.88%
7.15	130	1.76%
6.06	130	1.76%
8.00	128	1.74%
11.02	123	1.67%
11.0	110	1.49%
10.01	106	1.44%
9.21	75	1.02%
Other	812	11.01%
Lotus Domino (4,618 servers)
Version	Number of Servers	Percent
8.5.3	828	17.93%
8.5.3FP2	331	7.17%
8.5.2	292	6.32%
8.5.3FP3	250	5.41%
8.5.2FP2	215	4.66%
8.5.3FP1	212	4.59%
8.5.1	200	4.33%
7.0.2	176	3.81%
8.5	147	3.18%
8.5.2FP3	125	2.71%
8.5.2FP4	109	2.36%
7.0.3	104	2.25%
8.5.2FP1	89	1.93%
8.5.1FP5	85	1.84%
8.0.1	81	1.75%
7.0.1	81	1.75%
8.0.2	79	1.71%
6.5.4	76	1.65%
6.5.1	70	1.52%
7.0	66	1.43%
6.5.3	65	1.41%
8.0	60	1.30%
6.5.5	53	1.15%
Other	824	17.84%
WinWebMail (3,247 servers)
Version	Number of Servers	Percent
3.8.1.3	660	20.33%
3.8.0.1	426	13.12%
3.7.6.1	321	9.89%
3.8.1.5	283	8.72%
3.7.3.1	240	7.39%
3.8.2.1	223	6.87%
3.8.1.1	223	6.87%
3.7.7.3	213	6.56%
3.8.3.1	139	4.28%
3.7.1.1	107	3.30%
3.7.5.1	89	2.74%
3.8.3.3	84	2.59%
3.7.7.1	51	1.57%
3.6.3.1	47	1.45%
3.7.0.3	47	1.45%
3.7.0.5	38	1.17%
3.7.0.7	34	1.05%
Other	22	0.68%
CommuniGate Pro (3,179 servers)
Version	Number of Servers	Percent
5.1.16	285	8.97%
5.4.8	152	4.78%
4.1.8	125	3.93%
5.4.4	124	3.90%
6.0.1	117	3.68%
5.2.20	106	3.33%
5.4.6	94	2.96%
5.3.13	92	2.89%
5.4.5	77	2.42%
4.2.10	74	2.33%
5.4.1	73	2.30%
5.4.7	72	2.26%
5.2.16	70	2.20%
5.0.14	61	1.92%
5.2.3	60	1.89%
5.3.15	60	1.89%
5.1.12	59	1.86%
5.2.19	56	1.76%
5.4.3	55	1.73%
5.4.2	53	1.67%
6.0	50	1.57%
5.4.9	47	1.48%
5.2.14	44	1.38%
5.4.0	39	1.23%
5.2.12	37	1.16%
5.3.9	36	1.13%
5.2.13	35	1.10%
5.3.8	33	1.04%
5.2.8	32	1.01%
5.4	32	1.01%
5.3.10	32	1.01%
Other	897	28.22%
XMail (2,155 servers)
Version	Number of Servers	Percent
1.27	606	28.12%
1.22	515	23.90%
1.25	361	16.75%
1.26	237	11.00%
1.24	156	7.24%
1.21	77	3.57%
1.23	45	2.09%
1.20	35	1.62%
1.17	32	1.48%
Other	91	4.22%
Qmail Toaster (1,667 servers)
Version	Number of Servers	Percent
1.3	1,589	95.32%
1.2	47	2.82%
Other	31	1.86%
Kerio (1,552 servers)
Version	Number of Servers	Percent
6.7.3	240	15.46%
6.6.2	152	9.79%
6.7.0	149	9.60%
6.5.0	114	7.35%
6.5.2	103	6.64%
6.7.2	95	6.12%
6.4.1	90	5.80%
6.7.1	87	5.61%
6.3.1	75	4.83%
6.4.0	62	3.99%
6.6.0	52	3.35%
6.6.1	51	3.29%
6.5.1	50	3.22%
6.4.2	34	2.19%
6.3.0	29	1.87%
6.0.10	20	1.29%
6.2.0	17	1.10%
Other	132	8.51%
Merak (1,227 servers)
Version	Number of Servers	Percent
8.0.3	478	38.96%
8.9.1	128	10.43%
8.5.0	87	7.09%
7.5.2	63	5.13%
8.3.8	60	4.89%
7.4.5	52	4.24%
7.6.4	50	4.07%
7.0.1	23	1.87%
9.0.0	22	1.79%
7.4.2	20	1.63%
7.2.0	18	1.47%
7.6.1	18	1.47%
8.9.0	15	1.22%
8.3.15	15	1.22%
6.2.1	14	1.14%
7.6.0	13	1.06%
4.4.2	13	1.06%
Other	138	11.25%
SurgeSMTP (1,047 servers)
Version	Number of Servers	Percent
6.3c2-2	213	20.34%
6.1c-1	146	13.94%
5.2a-1	90	8.60%
5.3h2-2	88	8.40%
3.9e-1	52	4.97%
6.0a5-5	37	3.53%
3.8k4-4	29	2.77%
4.0u4-4	25	2.39%
6.0a4-4	22	2.10%
5.0e4-4	20	1.91%
4.2d2-2	19	1.81%
4.3g2-2	18	1.72%
3.8i3-3	14	1.34%
3.6f5-5	12	1.15%
4.2d4-4	11	1.05%
5.0e3-3	11	1.05%
3.9h-18	11	1.05%
Other	229	21.87%
ArGoSoft (721 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	179	24.83%
1.8 (1.8.9.5)	110	15.26%
1.8 (1.8.9.3)	96	13.31%
1.8 (1.8.9.1)	78	10.82%
1.8 (1.8.8.8)	47	6.52%
1.8 (1.8.8.7)	39	5.41%
1.8 (1.8.9.2)	21	2.91%
1.8 (1.8.9.4)	19	2.64%
1.8 (1.8.6.0)	14	1.94%
1.8 (1.8.8.9)	13	1.80%
Other	105	14.56%
GroupWise (463 servers)
Version	Number of Servers	Percent
7.0.3	85	18.36%
8.0.2	81	17.49%
6.5.7	51	11.02%
7.0.4	37	7.99%
7.0.2	28	6.05%
6.5.6	23	4.97%
7.0.1	17	3.67%
6.0.4	17	3.67%
8.0.3	17	3.67%
12.0.1	16	3.46%
6.5.4	16	3.46%
8.0.1	15	3.24%
6.5.1	14	3.02%
12.0.0	10	2.16%
8.0.0	8	1.73%
7.0	6	1.30%
6.5.5	5	1.08%
Other	17	3.67%
Post.Office (377 servers)
Version	Number of Servers	Percent
3.5.3	52	13.79%
4.1.0.2	35	9.28%
4.1.2.4	32	8.49%
4.0.1	24	6.37%
4.1.1	18	4.77%
3.9.2.3	13	3.45%
3.8.3	13	3.45%
4.2	12	3.18%
3.5.3J	11	2.92%
3.9.2	11	2.92%
4.1.0.3	10	2.65%
3.1.2J	9	2.39%
3.1.2	8	2.12%
4.1.0.4	8	2.12%
4.0.1.1	7	1.86%
3.6.2	7	1.86%
4.2.1.3	7	1.86%
4.2.1.1	7	1.86%
4.1.2.3	6	1.59%
4.1.2.2	6	1.59%
3.9.1	6	1.59%
3.9.1.2	5	1.33%
3.8.7.4	5	1.33%
3.5.1	5	1.33%
3.9.2.2	4	1.06%
3.5.4	4	1.06%
4.1	4	1.06%
3.9.1.3	4	1.06%
4.0.0.1	4	1.06%
4.2.2	4	1.06%
3.9.2.1	4	1.06%
4.2.1	4	1.06%
Other	28	7.43%
Trend Micro (316 servers)
Version	Number of Servers	Percent
5.7	123	38.92%
5.5	69	21.84%
5.18	58	18.35%
7.0	31	9.81%
7.1	24	7.59%
Other	11	3.48%
MagicMail (315 servers)
Version	Number of Servers	Percent
Other	315	100.00%
Gordano Messaging Suite (GMS) (312 servers)
Version	Number of Servers	Percent
Other	312	100.00%
Mirapoint (137 servers)
Version	Number of Servers	Percent
4.3.5-GA	16	11.68%
4.1.10-GA	12	8.76%
3.10.10a-GA	11	8.03%
4.2.3-GA	11	8.03%
3.10.9-GA	8	5.84%
4.1.9-GA	7	5.11%
4.2.4-GA	7	5.11%
3.8.5-GA	5	3.65%
3.10.8-GA	5	3.65%
4.1.4-GA	5	3.65%
4.1.3-GA	4	2.92%
3.8.3-GA	4	2.92%
3.10.5-GA	4	2.92%
4.1.8-GA	4	2.92%
4.3.3-GA	3	2.19%
4.3.4-GA	3	2.19%
3.8.4-GA	3	2.19%
3.10.7-GA	3	2.19%
4.1.5-GA	3	2.19%
3.7.5a-GA	2	1.46%
3.10.3-GA	2	1.46%
3.8.6-GA	2	1.46%
3.10.2-GA	2	1.46%
3.8.7a	2	1.46%
4.0.5a	2	1.46%
Other	7	5.11%
VisNetic (124 servers)
Version	Number of Servers	Percent
9.3.2.0	35	28.23%
9.1.4.1	16	12.90%
7.6.1.0	7	5.65%
8.5.0.8	7	5.65%
8.0.3.1	6	4.84%
5.5.8.3	6	4.84%
5.8.6.6	5	4.03%
7.2.4.1	5	4.03%
8.0.3.0	4	3.23%
5.0.2.3	4	3.23%
6.2.2.0	3	2.42%
8.0.3	3	2.42%
9.1.4.0	3	2.42%
8.3.5.0	2	1.61%
5.0.2.1	2	1.61%
5.4.5.4	2	1.61%
5.8.6.4	2	1.61%
Other	12	9.68%
InterScan VirusWall (115 servers)
Version	Number of Servers	Percent
Other	115	100.00%
Mercury (55 servers)
Version	Number of Servers	Percent
1.48	32	58.18%
3.32	14	25.45%
1.47	2	3.64%
3.21c	2	3.64%
3.21	1	1.82%
1.44	1	1.82%
4.x	1	1.82%
3.30	1	1.82%
3.01a	1	1.82%
Other	0	0.00%
Interscan (44 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	9	20.45%
3.81-Build_1022	8	18.18%
3.55 (build 1029)	6	13.64%
3.53 (build 2011)	4	9.09%
3.81-Build_1084	3	6.82%
3.53 (build 1493)	3	6.82%
3.53 (build 2017)	3	6.82%
3.8-Build_3013	2	4.55%
3.5 (build 1294)	1	2.27%
3.51 (build 1337)	1	2.27%
3.55 (build 1020)	1	2.27%
3.53 (build 2013)	1	2.27%
3.8-Build_3045	1	2.27%
3.8-Build_1080	1	2.27%
Other	0	0.00%
NetIQ MailMarshal (31 servers)
Version	Number of Servers	Percent
6.0.3.8	20	64.52%
5.5.6.7	3	9.68%
5.5.6.5	2	6.45%
5.5.6.6	2	6.45%
5.5.5.6	1	3.23%
5.5.4.17	1	3.23%
6.1.3.15	1	3.23%
5.5.4.16	1	3.23%
Other	0	0.00%
WebSTAR V (29 servers)
Version	Number of Servers	Percent
5.4.1	15	51.72%
5.4.0	7	24.14%
5.3.4	3	10.34%
5.3.3	2	6.90%
5.3.2	2	6.90%
Other	0	0.00%
Neon Mail Server (25 servers)
Version	Number of Servers	Percent
3.0.7	6	24.00%
3.1.3	5	20.00%
3.1.2	3	12.00%
3.1.0	3	12.00%
3.1.4	2	8.00%
3.0.9	2	8.00%
3.0.8	1	4.00%
3.1.1	1	4.00%
3.1.5	1	4.00%
3.0.6	1	4.00%
Other	0	0.00%
OpenSMTPD (24 servers)
Version	Number of Servers	Percent
Other	24	100.00%
OpenVMS (20 servers)
Version	Number of Servers	Percent
8.3	9	45.00%
8.4	6	30.00%
7.3	4	20.00%
8.2	1	5.00%
Other	0	0.00%
MessageWall (19 servers)
Version	Number of Servers	Percent
1.0.8	18	94.74%
1.0.6	1	5.26%
Other	0	0.00%
WebSTAR (14 servers)
Version	Number of Servers	Percent
Other	14	100.00%
ModusMail (13 servers)
Version	Number of Servers	Percent
4.35.477.0	6	46.15%
4.35.480.0	2	15.38%
4.1.361.21	1	7.69%
3.2.315.0	1	7.69%
4.0.340.3	1	7.69%
4.35.477.8	1	7.69%
3.1.302.0	1	7.69%
Other	0	0.00%
MAILsweeper (5 servers)
Version	Number of Servers	Percent
4.3.17.0	2	40.00%
4.3.19.0	2	40.00%
4.3.20.0	1	20.00%
Other	0	0.00%