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	2,169,463	100.0%
Number of Servers that didn't respond	355,811	16.40%
Server didn't open socket	343,073	15.81%
Server didn't provide banner	12,738	0.59%
Server provided banner	1,813,652	83.60%
Server banner identifies software in use	990,934	45.68%

As indicated by the above table, of the 2,169,463 servers queried, only 990,934 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	366,203	36.96%
Postfix	216,594	21.86%
Microsoft	162,182	16.37%
Sendmail	147,983	14.93%
MailEnable	31,509	3.18%
MDaemon	22,401	2.26%
IMail	12,242	1.24%
Lotus Domino	5,241	0.53%
WinWebMail	4,841	0.49%
CommuniGate Pro	3,703	0.37%
Kerio	3,661	0.37%
XMail	2,586	0.26%
Merak	2,353	0.24%
Qmail Toaster	1,761	0.18%
ArGoSoft	1,337	0.13%
SurgeSMTP	1,321	0.13%
GroupWise	1,204	0.12%
Trend Micro	797	0.08%
Gordano Messaging Suite (GMS)	541	0.05%
Post.Office	524	0.05%
MagicMail	461	0.05%
Mirapoint	356	0.04%
InterScan VirusWall	274	0.03%
VisNetic	268	0.03%
NetIQ MailMarshal	129	0.01%
Interscan	105	0.01%
Mercury	89	0.01%
WebSTAR V	68	0.01%
Neon Mail Server	62	0.01%
MessageWall	30	0.00%
ModusMail	30	0.00%
WebSTAR	29	0.00%
OpenVMS	27	0.00%
MAILsweeper	15	0.00%
OpenSMTPD	7	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (366,203 servers)
Version	Number of Servers	Percent
4.69	314,042	85.76%
4.67	14,410	3.93%
4.63	12,032	3.29%
4.72	7,662	2.09%
4.71	5,298	1.45%
Other	12,759	3.48%
Postfix (216,594 servers)
Version	Number of Servers	Percent
Other	216,594	100.00%
Microsoft (162,182 servers)
Version	Number of Servers	Percent
6.0.3790.4675	108,396	66.84%
6.0.3790.3959	37,044	22.84%
6.0.3790.1830	9,040	5.57%
5.0.2195.7381	2,422	1.49%
5.0.2195.6713	1,994	1.23%
Other	3,286	2.03%
Sendmail (147,983 servers)
Version	Number of Servers	Percent
8.13.8	28,770	19.44%
8.13.1	28,102	18.99%
8.14.4	15,822	10.69%
8.14.3	15,118	10.22%
8.12.11.20060614	8,906	6.02%
8.12.11.20060308	8,660	5.85%
8.13.6.20060614	5,668	3.83%
8.14.2	4,649	3.14%
8.11.6	4,497	3.04%
8.12.10	4,451	3.01%
8.13.6	3,649	2.47%
8.14.1	3,465	2.34%
8.12.11	2,804	1.89%
8.13.7	2,505	1.69%
8.13.4	2,426	1.64%
8.12.8	2,147	1.45%
Other	6,344	4.29%
MailEnable (31,509 servers)
Version	Number of Servers	Percent
1.986--	10,541	33.45%
1.981--	2,859	9.07%
1.983--	1,822	5.78%
3.62--	1,196	3.80%
0-3.63-	912	2.89%
4.23--	875	2.78%
4.22--	743	2.36%
1.96--	511	1.62%
1.95--	477	1.51%
4.26--	468	1.49%
0-1.87-	446	1.42%
0-2.53-	442	1.40%
0-4.26-	439	1.39%
4.26--4.26	401	1.27%
--3.63	396	1.26%
0-4.23-	381	1.21%
4.14--	373	1.18%
1.9--	372	1.18%
4.17--	343	1.09%
0-3.61-	323	1.03%
Other	7,189	22.82%
MDaemon (22,401 servers)
Version	Number of Servers	Percent
11.0.3	5,605	25.02%
10.1.2	1,670	7.46%
10.0.0	1,280	5.71%
11.0.0	1,112	4.96%
10.1.1	1,067	4.76%
9.6.1	808	3.61%
9.6.6	763	3.41%
10.1.0	652	2.91%
9.6.5	541	2.42%
11.0.2	525	2.34%
10.0.5	522	2.33%
9.5.2	510	2.28%
10.0.2	467	2.08%
10.0.4	431	1.92%
9.6.2	413	1.84%
9.5.1	412	1.84%
11.0.1	388	1.73%
8.1.3	386	1.72%
9.6.4	385	1.72%
9.5.6	376	1.68%
9.0.4	344	1.54%
9.6.3	243	1.08%
9.5.5	229	1.02%
Other	3,272	14.61%
IMail (12,242 servers)
Version	Number of Servers	Percent
8.22	2,363	19.30%
11.02	1,390	11.35%
8.15	1,129	9.22%
11.01	865	7.07%
9.23	853	6.97%
8.05	519	4.24%
9.20	493	4.03%
9.10	487	3.98%
10.02	468	3.82%
11.0	447	3.65%
7.07	341	2.79%
9.21	338	2.76%
7.15	278	2.27%
8.00	267	2.18%
6.06	238	1.94%
10.01	173	1.41%
8.04	168	1.37%
11.03	159	1.30%
8.10	134	1.09%
8.21	126	1.03%
Other	1,006	8.22%
Lotus Domino (5,241 servers)
Version	Number of Servers	Percent
8.5.1	554	10.57%
8.5.2	422	8.05%
8.5	374	7.14%
7.0.2	347	6.62%
8.5.1FP3	234	4.46%
7.0.3	208	3.97%
8.0.1	191	3.64%
8.0.2	188	3.59%
7.0.1	187	3.57%
6.5.4	152	2.90%
6.5.1	151	2.88%
8.5.1FP2	148	2.82%
8.5.1FP4	135	2.58%
6.5.3	128	2.44%
7.0.3FP1	122	2.33%
8.0	114	2.18%
7.0	110	2.10%
6.5.5	109	2.08%
7.0.2FP2	103	1.97%
8.5.1FP1	90	1.72%
6.5	86	1.64%
8.5FP1	78	1.49%
5.0.11	60	1.14%
Other	950	18.13%
WinWebMail (4,841 servers)
Version	Number of Servers	Percent
3.8.0.1	1,144	23.63%
3.7.6.1	766	15.82%
3.7.3.1	572	11.82%
3.7.7.3	568	11.73%
3.8.1.1	501	10.35%
3.7.1.1	269	5.56%
3.8.1.3	242	5.00%
3.7.5.1	176	3.64%
3.7.7.1	146	3.02%
3.6.3.1	134	2.77%
3.7.0.5	117	2.42%
3.7.0.3	88	1.82%
3.7.0.7	84	1.74%
Other	34	0.70%
CommuniGate Pro (3,703 servers)
Version	Number of Servers	Percent
5.1.16	211	5.70%
4.1.8	203	5.48%
5.3.8	169	4.56%
5.2.16	167	4.51%
5.3.9	159	4.29%
4.2.10	136	3.67%
5.3.10	134	3.62%
5.2.19	102	2.75%
5.2.20	97	2.62%
5.1.12	94	2.54%
5.3.5	90	2.43%
5.3.7	89	2.40%
5.2.3	84	2.27%
5.0.14	82	2.21%
5.2.14	77	2.08%
5.2.12	76	2.05%
5.1.13	72	1.94%
5.3.2	65	1.76%
5.2.8	63	1.70%
5.2.13	62	1.67%
5.2.10	56	1.51%
5.2.18	52	1.40%
5.1.14	50	1.35%
5.0.9	45	1.22%
5.2.0	40	1.08%
5.2.11	40	1.08%
5.1.9	39	1.05%
Other	1,149	31.03%
Kerio (3,661 servers)
Version	Number of Servers	Percent
6.7.3	533	14.56%
6.6.2	398	10.87%
6.7.0	380	10.38%
6.7.2	308	8.41%
6.5.0	240	6.56%
6.5.2	210	5.74%
6.7.1	208	5.68%
6.4.1	179	4.89%
6.3.1	176	4.81%
6.6.0	127	3.47%
6.5.1	124	3.39%
6.4.0	120	3.28%
6.4.2	91	2.49%
6.6.1	88	2.40%
6.3.0	72	1.97%
6.1.3	37	1.01%
Other	370	10.11%
XMail (2,586 servers)
Version	Number of Servers	Percent
1.22	618	23.90%
1.25	605	23.40%
1.26	339	13.11%
1.24	320	12.37%
1.27	244	9.44%
1.21	125	4.83%
1.23	66	2.55%
1.20	62	2.40%
1.17	55	2.13%
1.12	49	1.89%
Other	103	3.98%
Merak (2,353 servers)
Version	Number of Servers	Percent
8.0.3	962	40.88%
8.9.1	231	9.82%
8.5.0	155	6.59%
7.5.2	112	4.76%
7.4.5	107	4.55%
7.6.4	97	4.12%
8.3.8	93	3.95%
8.2.13	47	2.00%
9.0.0	36	1.53%
7.4.2	34	1.44%
7.0.1	31	1.32%
7.6.1	31	1.32%
7.2.0	30	1.27%
8.3.15	29	1.23%
8.2.4	27	1.15%
8.9.0	27	1.15%
Other	304	12.92%
Qmail Toaster (1,761 servers)
Version	Number of Servers	Percent
1.3	1,611	91.48%
1.2	104	5.91%
1.0	31	1.76%
Other	15	0.85%
ArGoSoft (1,337 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	270	20.19%
1.8 (1.8.9.5)	214	16.01%
1.8 (1.8.9.3)	176	13.16%
1.8 (1.8.9.1)	129	9.65%
1.8 (1.8.8.8)	100	7.48%
1.8 (1.8.8.7)	77	5.76%
1.8 (1.8.9.2)	58	4.34%
1.8 (1.8.9.4)	40	2.99%
1.8 (1.8.8.9)	26	1.94%
1.8 (1.8.8.1)	25	1.87%
1.8 (1.8.9.0)	20	1.50%
1.8 (1.8.6.0)	18	1.35%
1.8 (1.8.8.2)	14	1.05%
Other	170	12.72%
SurgeSMTP (1,321 servers)
Version	Number of Servers	Percent
5.0e4-4	185	14.00%
4.2d4-4	151	11.43%
3.9e-1	136	10.30%
3.8k4-4	76	5.75%
4.3g2-2	62	4.69%
4.0u4-4	60	4.54%
5.0e3-3	60	4.54%
4.3g4-4	54	4.09%
4.3e-1	47	3.56%
4.2d2-2	43	3.26%
3.8i3-3	32	2.42%
4.3g-1	30	2.27%
3.7b8-8	28	2.12%
3.8f3-3	24	1.82%
3.9c-1	21	1.59%
3.6f5-5	21	1.59%
5.0m-1	18	1.36%
4.2a3-3	18	1.36%
5.0i-1	17	1.29%
3.9g2-2	15	1.14%
3.8f2-2	15	1.14%
3.9h-18	14	1.06%
Other	194	14.69%
GroupWise (1,204 servers)
Version	Number of Servers	Percent
7.0.3	313	26.00%
6.5.7	137	11.38%
8.0.2	121	10.05%
7.0.2	119	9.88%
8.0.1	111	9.22%
7.0.1	61	5.07%
6.5.4	61	5.07%
6.5.6	50	4.15%
6.0.4	38	3.16%
7.0.4	37	3.07%
8.0.0	36	2.99%
6.5.1	33	2.74%
6.5.5	20	1.66%
Other	67	5.56%
Trend Micro (797 servers)
Version	Number of Servers	Percent
5.7	348	43.66%
5.5	214	26.85%
5.18	133	16.69%
7.0	67	8.41%
7.1	14	1.76%
7	10	1.25%
Other	11	1.38%
Gordano Messaging Suite (GMS) (541 servers)
Version	Number of Servers	Percent
Other	541	100.00%
Post.Office (524 servers)
Version	Number of Servers	Percent
3.5.3	85	16.22%
4.1.0.2	62	11.83%
4.0.1	43	8.21%
3.5.3J	27	5.15%
4.1.1	27	5.15%
3.8.3	23	4.39%
4.1.0.4	19	3.63%
3.9.2.3	16	3.05%
3.9.1	15	2.86%
3.1.2J	15	2.86%
3.9.2	13	2.48%
3.6.2	13	2.48%
3.8.7.4	13	2.48%
3.1.2	11	2.10%
4.1.0.3	11	2.10%
4.0.1.1	11	2.10%
3.6.3	11	2.10%
4.1.2.2	10	1.91%
4.0.0.2	10	1.91%
3.9.2.1	8	1.53%
4.1	7	1.34%
4.0.0.1	7	1.34%
3.9.1.2	6	1.15%
3.9.1.3	6	1.15%
Other	55	10.50%
MagicMail (461 servers)
Version	Number of Servers	Percent
Other	461	100.00%
Mirapoint (356 servers)
Version	Number of Servers	Percent
3.8.4-GA	33	9.27%
3.10.8-GA	33	9.27%
3.10.5-GA	32	8.99%
3.8.3-GA	26	7.30%
3.10.9-GA	24	6.74%
3.10.7-GA	22	6.18%
4.1.9-GA	18	5.06%
4.1.3-GA	16	4.49%
4.1.8-GA	15	4.21%
3.10.4-GA	13	3.65%
3.10.6-GA	13	3.65%
3.10.3-GA	12	3.37%
3.10.10a-GA	12	3.37%
4.1.10-GA	9	2.53%
3.8.7a	9	2.53%
4.1.4-GA	8	2.25%
3.8.5-GA	7	1.97%
3.8.2-GA	7	1.97%
3.8.6-GA	7	1.97%
3.7.5a-GA	5	1.40%
3.10.2-GA	5	1.40%
4.1.5-GA	5	1.40%
4.0.5a	4	1.12%
3.7.3a-GA	4	1.12%
Other	17	4.78%
InterScan VirusWall (274 servers)
Version	Number of Servers	Percent
Other	274	100.00%
VisNetic (268 servers)
Version	Number of Servers	Percent
9.3.2.0	96	35.82%
9.1.4.1	38	14.18%
5.8.6.6	14	5.22%
8.5.0.8	14	5.22%
5.5.8.3	11	4.10%
8.0.3.1	9	3.36%
6.2.2.0	7	2.61%
8.0.3	7	2.61%
7.6.1.0	7	2.61%
8.0.3.0	7	2.61%
8.3.5.0	6	2.24%
5.4.5.4	6	2.24%
9.1.4.0	5	1.87%
7.2.4.1	5	1.87%
8.3.6	4	1.49%
5.0.2.3	4	1.49%
5.3.5.0	4	1.49%
7.5.3.0	3	1.12%
7.2.4.0	3	1.12%
5.0.2.1	3	1.12%
Other	15	5.60%
NetIQ MailMarshal (129 servers)
Version	Number of Servers	Percent
6.0.3.8	93	72.09%
6.1.3.15	9	6.98%
5.5.6.7	9	6.98%
5.5.6.6	4	3.10%
5.5.4.16	4	3.10%
5.5.3.17	2	1.55%
5.5.6.5	2	1.55%
Other	6	4.65%
Interscan (105 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	17	16.19%
3.81-Build_1022	17	16.19%
3.55 (build 1029)	12	11.43%
3.53 (build 2017)	11	10.48%
3.8-Build_3013	9	8.57%
3.55 (build 1020)	6	5.71%
3.81-Build_1084	6	5.71%
3.53 (build 1493)	4	3.81%
3.53 (build 2011)	4	3.81%
3.52 (build 1375)	3	2.86%
3.53 (build 1494)	2	1.90%
3.53 (build 2013)	2	1.90%
3.8-Build_1080	2	1.90%
Other	10	9.52%
Mercury (89 servers)
Version	Number of Servers	Percent
1.48	47	52.81%
3.32	24	26.97%
3.21c	8	8.99%
3.01a	2	2.25%
1.47	2	2.25%
3.30	2	2.25%
3.21	1	1.12%
1.44	1	1.12%
3.31	1	1.12%
1.49	1	1.12%
Other	0	0.00%
WebSTAR V (68 servers)
Version	Number of Servers	Percent
5.4.1	25	36.76%
5.4.0	16	23.53%
5.3.4	14	20.59%
5.3.2	6	8.82%
5.3.3	5	7.35%
5.3.0	1	1.47%
5.3.1	1	1.47%
Other	0	0.00%
Neon Mail Server (62 servers)
Version	Number of Servers	Percent
3.1.3	18	29.03%
3.0.7	14	22.58%
3.0.9	8	12.90%
3.1.4	6	9.68%
3.1.2	5	8.06%
3.1.0	4	6.45%
3.1.5	3	4.84%
3.1.1	2	3.23%
3.0.8	1	1.61%
3.0.6	1	1.61%
Other	0	0.00%
MessageWall (30 servers)
Version	Number of Servers	Percent
1.0.8	28	93.33%
1.0.6	1	3.33%
1.1.0	1	3.33%
Other	0	0.00%
ModusMail (30 servers)
Version	Number of Servers	Percent
4.35.477.0	9	30.00%
4.2.420.0	5	16.67%
4.35.480.0	3	10.00%
4.1.361.21	2	6.67%
3.1.293.1	2	6.67%
3.1.302.0	2	6.67%
4.35.480.11	2	6.67%
4.2.425.22	1	3.33%
3.2.315.0	1	3.33%
4.0.340.3	1	3.33%
4.3.459.0	1	3.33%
4.35.477.8	1	3.33%
Other	0	0.00%
WebSTAR (29 servers)
Version	Number of Servers	Percent
Other	29	100.00%
OpenVMS (27 servers)
Version	Number of Servers	Percent
8.3	14	51.85%
7.3	8	29.63%
8.2	2	7.41%
6.1	1	3.70%
8.4	1	3.70%
7.2	1	3.70%
Other	0	0.00%
MAILsweeper (15 servers)
Version	Number of Servers	Percent
4.3.17.0	4	26.67%
4.3.6.0	4	26.67%
4.3.20.0	2	13.33%
4.3.14.0	2	13.33%
4.3.10.0	1	6.67%
4.3.1.0	1	6.67%
4.2.5.0	1	6.67%
Other	0	0.00%
OpenSMTPD (7 servers)
Version	Number of Servers	Percent
Other	7	100.00%