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	1,718,433	100.0%
Number of Servers that didn't respond	268,266	15.61%
Server didn't open socket	257,624	14.99%
Server didn't provide banner	10,642	0.62%
Server provided banner	1,450,167	84.39%
Server banner identifies software in use	831,321	48.38%

As indicated by the above table, of the 1,718,433 servers queried, only 831,321 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	221,295	26.62%
Sendmail	185,968	22.37%
Microsoft	172,747	20.78%
Postfix	149,678	18.00%
MailEnable	24,501	2.95%
MDaemon	20,450	2.46%
IMail	16,726	2.01%
Kerio	5,619	0.68%
Lotus Domino	5,327	0.64%
WinWebMail	4,864	0.59%
Merak	4,277	0.51%
CommuniGate Pro	4,078	0.49%
XMail	2,418	0.29%
GroupWise	2,051	0.25%
ArGoSoft	1,952	0.23%
Trend Micro	1,858	0.22%
Qmail Toaster	1,642	0.20%
SurgeSMTP	1,476	0.18%
Gordano Messaging Suite (GMS)	733	0.09%
Post.Office	645	0.08%
Mirapoint	499	0.06%
InterScan VirusWall	447	0.05%
VisNetic	410	0.05%
MagicMail	370	0.04%
NetIQ MailMarshal	352	0.04%
Interscan	280	0.03%
Neon Mail Server	148	0.02%
WebSTAR V	139	0.02%
Mercury	118	0.01%
ModusMail	78	0.01%
MessageWall	57	0.01%
WebSTAR	52	0.01%
MAILsweeper	44	0.01%
OpenVMS	22	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (221,295 servers)
Version	Number of Servers	Percent
4.69	163,886	74.06%
4.63	20,361	9.20%
4.67	9,769	4.41%
4.68	7,030	3.18%
4.66	4,225	1.91%
4.60	4,040	1.83%
4.50	3,266	1.48%
4.62	2,900	1.31%
Other	5,818	2.63%
Sendmail (185,968 servers)
Version	Number of Servers	Percent
8.13.1	31,393	16.88%
8.12.11.20060614	19,008	10.22%
8.13.8	18,727	10.07%
8.13.6	17,921	9.64%
8.12.11.20060308	16,118	8.67%
8.11.6	10,899	5.86%
8.13.6.20060614	10,233	5.50%
8.12.10	9,031	4.86%
8.12.11	8,392	4.51%
8.14.1	7,632	4.10%
8.14.3	6,298	3.39%
8.14.2	6,062	3.26%
8.13.4	4,841	2.60%
8.13.7	4,174	2.24%
8.12.8	3,765	2.02%
8.9.3	2,118	1.14%
8.10.2	1,880	1.01%
Other	7,476	4.02%
Microsoft (172,747 servers)
Version	Number of Servers	Percent
6.0.3790.3959	133,435	77.24%
6.0.3790.1830	23,282	13.48%
5.0.2195.6713	10,597	6.13%
6.0.3790.211	2,745	1.59%
Other	2,688	1.56%
Postfix (149,678 servers)
Version	Number of Servers	Percent
Other	149,678	100.00%
MailEnable (24,501 servers)
Version	Number of Servers	Percent
1.981--	4,840	19.75%
1.986--	4,086	16.68%
1.983--	3,048	12.44%
1.96--	1,112	4.54%
1.95--	1,053	4.30%
1.9--	817	3.33%
0-3.6-	646	2.64%
1.8--	635	2.59%
0-3.14-	570	2.33%
0-2.37-	557	2.27%
0-3.53-	503	2.05%
--3.6	454	1.85%
0-1.85-	441	1.80%
0-2.52-	291	1.19%
0-1.87-	287	1.17%
0--3.53	286	1.17%
0-2.38-	267	1.09%
Other	4,608	18.81%
MDaemon (20,450 servers)
Version	Number of Servers	Percent
10.0.2	3,806	18.61%
9.6.6	1,555	7.60%
9.6.1	1,271	6.22%
9.6.5	1,248	6.10%
10.0.1	1,049	5.13%
10.0.0	1,045	5.11%
9.6.4	818	4.00%
9.6.2	709	3.47%
9.5.2	707	3.46%
8.1.3	693	3.39%
9.5.6	651	3.18%
9.0.4	606	2.96%
9.5.1	549	2.68%
9.6.3	424	2.07%
7.2.3	391	1.91%
6.8.5	366	1.79%
9.0.1	328	1.60%
7.2.0	303	1.48%
9.0.0	259	1.27%
9.5.5	256	1.25%
8.1.4	242	1.18%
8.0.2	224	1.10%
Other	2,950	14.43%
IMail (16,726 servers)
Version	Number of Servers	Percent
8.22	3,515	21.02%
8.15	1,970	11.78%
9.23	1,360	8.13%
10.01	1,082	6.47%
8.05	982	5.87%
9.10	972	5.81%
10.02	948	5.67%
7.07	629	3.76%
9.21	574	3.43%
7.15	486	2.91%
6.06	426	2.55%
8.00	383	2.29%
10.0	361	2.16%
8.04	331	1.98%
9.20	322	1.93%
8.21	297	1.78%
9.22	276	1.65%
8.01	225	1.35%
8.10	202	1.21%
8.20	179	1.07%
Other	1,206	7.21%
Kerio (5,619 servers)
Version	Number of Servers	Percent
6.5.2	843	15.00%
6.6.0	672	11.96%
6.6.1	620	11.03%
6.5.0	544	9.68%
6.6.2	510	9.08%
6.4.1	402	7.15%
6.5.1	379	6.74%
6.3.1	366	6.51%
6.4.2	245	4.36%
6.4.0	228	4.06%
6.3.0	135	2.40%
Other	675	12.01%
Lotus Domino (5,327 servers)
Version	Number of Servers	Percent
8.0.2	530	9.95%
7.0.2	523	9.82%
8.0.1	466	8.75%
7.0.3	340	6.38%
6.5.4	279	5.24%
7.0.1	273	5.12%
6.5.1	234	4.39%
6.5.3	223	4.19%
7.0.2FP2	213	4.00%
8.0	194	3.64%
7.0	193	3.62%
7.0.3FP1	188	3.53%
6.5.5	178	3.34%
6.5	150	2.82%
7.0.2FP1	107	2.01%
5.0.11	89	1.67%
6.5.2	89	1.67%
7.0.2FP3	62	1.16%
6.5.6	59	1.11%
5.0.13a	57	1.07%
5.0.12	56	1.05%
Other	824	15.47%
WinWebMail (4,864 servers)
Version	Number of Servers	Percent
3.7.6.1	1,237	25.43%
3.7.3.1	1,042	21.42%
3.7.1.1	580	11.92%
3.7.7.3	554	11.39%
3.7.5.1	329	6.76%
3.6.3.1	308	6.33%
3.7.0.5	238	4.89%
3.7.7.1	218	4.48%
3.7.0.7	161	3.31%
3.7.0.3	158	3.25%
Other	39	0.80%
Merak (4,277 servers)
Version	Number of Servers	Percent
8.0.3	1,718	40.17%
8.9.1	416	9.73%
8.5.0	259	6.06%
7.4.5	223	5.21%
7.5.2	205	4.79%
7.6.4	202	4.72%
8.3.8	182	4.26%
9.0.0	87	2.03%
7.4.2	82	1.92%
7.2.0	66	1.54%
7.6.1	64	1.50%
6.2.1	61	1.43%
8.2.4	54	1.26%
8.2.13	46	1.08%
Other	612	14.31%
CommuniGate Pro (4,078 servers)
Version	Number of Servers	Percent
4.1.8	327	8.02%
5.2.10	252	6.18%
5.1.13	217	5.32%
4.2.10	201	4.93%
5.2.8	169	4.14%
5.1.16	152	3.73%
5.1.12	148	3.63%
5.2.11	133	3.26%
5.1.14	124	3.04%
5.2.9	113	2.77%
5.2.3	108	2.65%
5.2.6	107	2.62%
5.2.5	93	2.28%
5.2.0	90	2.21%
5.0.13	88	2.16%
5.0.9	85	2.08%
5.0.14	77	1.89%
5.1.9	69	1.69%
5.2.1	62	1.52%
5.1.7	59	1.45%
5.1.10	59	1.45%
5.1.8	57	1.40%
5.2.7	55	1.35%
4.2.8	55	1.35%
4.2	55	1.35%
5.1.11	54	1.32%
4.3.12	49	1.20%
4.2.7	46	1.13%
4.2.9	45	1.10%
5.0.8	42	1.03%
Other	887	21.75%
XMail (2,418 servers)
Version	Number of Servers	Percent
1.22	681	28.16%
1.25	622	25.72%
1.24	446	18.44%
1.21	205	8.48%
1.17	97	4.01%
1.20	92	3.80%
1.23	90	3.72%
1.12	63	2.61%
1.16	32	1.32%
Other	90	3.72%
GroupWise (2,051 servers)
Version	Number of Servers	Percent
7.0.3	647	31.55%
7.0.2	374	18.24%
6.5.7	228	11.12%
7.0.1	181	8.82%
6.5.4	135	6.58%
6.5.6	94	4.58%
6.0.4	80	3.90%
6.5.1	56	2.73%
6.5.5	54	2.63%
7.0	45	2.19%
8.0.0	37	1.80%
6.5.2	21	1.02%
Other	99	4.83%
ArGoSoft (1,952 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.5)	439	22.49%
1.8 (1.8.9.3)	300	15.37%
1.8 (1.8.9.1)	221	11.32%
1.8 (1.8.8.8)	165	8.45%
1.8 (1.8.8.7)	145	7.43%
1.8 (1.8.9.2)	94	4.82%
1.8 (1.8.9.4)	56	2.87%
1.8 (1.8.9.6)	56	2.87%
1.8 (1.8.8.9)	49	2.51%
1.8 (1.8.8.1)	41	2.10%
1.8 (1.8.9.0)	34	1.74%
1.8 (1.8.6.0)	31	1.59%
1.8 (1.8.8.2)	25	1.28%
1.8 (1.8.7.5)	22	1.13%
1.8 (1.8.5.9)	20	1.02%
Other	254	13.01%
Trend Micro (1,858 servers)
Version	Number of Servers	Percent
5.7	902	48.55%
5.5	599	32.24%
5.18	232	12.49%
7.0	94	5.06%
Other	31	1.67%
Qmail Toaster (1,642 servers)
Version	Number of Servers	Percent
1.3	1,354	82.46%
1.2	228	13.89%
1.0	43	2.62%
Other	17	1.04%
SurgeSMTP (1,476 servers)
Version	Number of Servers	Percent
3.9e-1	488	33.06%
3.9c-1	156	10.57%
3.9g2-2	137	9.28%
3.8k4-4	136	9.21%
3.8f3-3	73	4.95%
3.7b8-8	61	4.13%
3.8i3-3	49	3.32%
3.6f5-5	47	3.18%
3.5b3-3	39	2.64%
3.9h-65	27	1.83%
3.8f2-2	27	1.83%
3.0c2-2	19	1.29%
3.8k2-2	17	1.15%
Other	200	13.55%
Gordano Messaging Suite (GMS) (733 servers)
Version	Number of Servers	Percent
Other	733	100.00%
Post.Office (645 servers)
Version	Number of Servers	Percent
3.5.3	168	26.05%
4.0.1	56	8.68%
4.1.0.2	50	7.75%
3.5.3J	40	6.20%
3.8.3	33	5.12%
3.6.3	29	4.50%
3.1.2J	22	3.41%
3.9.1	21	3.26%
3.6.2	21	3.26%
3.9.2.3	20	3.10%
3.1.2	17	2.64%
3.9.2	16	2.48%
3.8.7.4	14	2.17%
3.5.2	11	1.71%
3.9.0	11	1.71%
4.1	10	1.55%
3.8.4	10	1.55%
3.9.1.3	9	1.40%
3.9.2.1	9	1.40%
3.6.0	7	1.09%
4.0.0.2	7	1.09%
3.8.5	7	1.09%
Other	57	8.84%
Mirapoint (499 servers)
Version	Number of Servers	Percent
3.8.4-GA	77	15.43%
3.8.3-GA	74	14.83%
3.8.6-GA	50	10.02%
3.8.7a	43	8.62%
3.10.3-GA	41	8.22%
3.8.5-GA	28	5.61%
3.7.5a-GA	28	5.61%
3.8.2-GA	23	4.61%
3.7.3a-GA	21	4.21%
3.10.2-GA	18	3.61%
3.7.4b-GA	18	3.61%
3.10.4-GA	17	3.41%
4.0.5a	9	1.80%
4.1.3-GA	9	1.80%
3.7.5-GA	6	1.20%
Other	37	7.41%
InterScan VirusWall (447 servers)
Version	Number of Servers	Percent
Other	447	100.00%
VisNetic (410 servers)
Version	Number of Servers	Percent
9.1.4.1	84	20.49%
9.3.2.0	79	19.27%
8.5.0.8	21	5.12%
5.8.6.6	18	4.39%
5.0.2.3	16	3.90%
9.1.4.0	15	3.66%
5.5.8.3	15	3.66%
8.0.3.0	15	3.66%
7.2.4.1	15	3.66%
8.0.3.1	14	3.41%
6.2.2.0	14	3.41%
5.3.5.0	11	2.68%
8.3.5.0	11	2.68%
7.6.1.0	10	2.44%
8.3.6	9	2.20%
5.4.5.4	9	2.20%
8.0.3	9	2.20%
7.5.3.0	5	1.22%
6.0.9.0	5	1.22%
Other	35	8.54%
MagicMail (370 servers)
Version	Number of Servers	Percent
Other	370	100.00%
NetIQ MailMarshal (352 servers)
Version	Number of Servers	Percent
6.0.3.8	277	78.69%
5.5.6.7	21	5.97%
6.1.3.15	19	5.40%
5.5.6.6	9	2.56%
5.5.4.16	6	1.70%
5.5.5.9	4	1.14%
5.5.5.6	4	1.14%
Other	12	3.41%
Interscan (280 servers)
Version	Number of Servers	Percent
3.8-Build_3013	53	18.93%
3.55 (build 1016)	46	16.43%
3.81-Build_1022	43	15.36%
3.55 (build 1029)	25	8.93%
3.53 (build 2017)	20	7.14%
3.53 (build 2011)	16	5.71%
3.53 (build 1493)	13	4.64%
3.55 (build 1020)	12	4.29%
3.81-Build_1084	11	3.93%
3.53 (build 2013)	10	3.57%
3.52 (build 1375)	7	2.50%
3.8-Build_3065	3	1.07%
3.8-Build_1080	3	1.07%
Other	18	6.43%
Neon Mail Server (148 servers)
Version	Number of Servers	Percent
3.1.3	46	31.08%
3.0.7	24	16.22%
3.0.9	23	15.54%
3.1.2	16	10.81%
3.1.0	15	10.14%
3.1.4	14	9.46%
3.1.1	3	2.03%
3.0.6	3	2.03%
3.0.8	2	1.35%
3.0.5	2	1.35%
Other	0	0.00%
WebSTAR V (139 servers)
Version	Number of Servers	Percent
5.4.1	43	30.94%
5.4.0	36	25.90%
5.3.4	32	23.02%
5.3.2	13	9.35%
5.3.3	13	9.35%
Other	2	1.44%
Mercury (118 servers)
Version	Number of Servers	Percent
1.48	56	47.46%
3.32	37	31.36%
3.21c	9	7.63%
1.47	4	3.39%
3.31	4	3.39%
3.21	3	2.54%
1.49	2	1.69%
Other	3	2.54%
ModusMail (78 servers)
Version	Number of Servers	Percent
4.35.480.0	17	21.79%
3.2.315.0	15	19.23%
4.35.477.0	10	12.82%
4.3.459.0	9	11.54%
3.1.302.0	7	8.97%
4.35.480.11	6	7.69%
4.1.361.21	3	3.85%
4.2.425.4	2	2.56%
4.1.361.0	2	2.56%
4.2.425.22	1	1.28%
4.2.420.0	1	1.28%
4.0.340.3	1	1.28%
4.0.330.8	1	1.28%
1.4.232.0	1	1.28%
3.1.293.1	1	1.28%
4.35.477.8	1	1.28%
Other	0	0.00%
MessageWall (57 servers)
Version	Number of Servers	Percent
1.0.8	40	70.18%
1.0.11	14	24.56%
1.1.0	2	3.51%
1.0.6	1	1.75%
Other	0	0.00%
WebSTAR (52 servers)
Version	Number of Servers	Percent
Other	52	100.00%
MAILsweeper (44 servers)
Version	Number of Servers	Percent
4.3.20.0	12	27.27%
4.3.14.0	7	15.91%
4.3.17.0	6	13.64%
4.3.1.0	6	13.64%
4.3.19.0	4	9.09%
4.2.10.0	4	9.09%
4.3.6.0	2	4.55%
4.3.10.0	1	2.27%
4.2.5.0	1	2.27%
4.1.5.0	1	2.27%
Other	0	0.00%
OpenVMS (22 servers)
Version	Number of Servers	Percent
8.3	12	54.55%
7.3	5	22.73%
8.2	3	13.64%
7.2	2	9.09%
Other	0	0.00%