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	2,387,088	100.0%
Number of Servers that didn't respond	403,065	16.89%
Server didn't open socket	390,844	16.37%
Server didn't provide banner	12,221	0.51%
Server provided banner	1,984,023	83.11%
Server banner identifies software in use	1,082,757	45.36%

As indicated by the above table, of the 2,387,088 servers queried, only 1,082,757 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	487,609	45.03%
Postfix	260,456	24.05%
Sendmail	127,914	11.81%
Microsoft	117,985	10.90%
MailEnable	33,628	3.11%
MDaemon	21,513	1.99%
IMail	8,807	0.81%
Lotus Domino	4,881	0.45%
WinWebMail	3,899	0.36%
CommuniGate Pro	3,353	0.31%
XMail	2,362	0.22%
Kerio	1,984	0.18%
Qmail Toaster	1,685	0.16%
Merak	1,494	0.14%
SurgeSMTP	1,170	0.11%
ArGoSoft	918	0.08%
GroupWise	689	0.06%
Post.Office	427	0.04%
Trend Micro	418	0.04%
Gordano Messaging Suite (GMS)	395	0.04%
MagicMail	328	0.03%
Mirapoint	193	0.02%
VisNetic	157	0.01%
InterScan VirusWall	153	0.01%
Interscan	58	0.01%
NetIQ MailMarshal	55	0.01%
Mercury	54	0.00%
WebSTAR V	39	0.00%
Neon Mail Server	36	0.00%
OpenVMS	24	0.00%
MessageWall	20	0.00%
OpenSMTPD	16	0.00%
ModusMail	16	0.00%
WebSTAR	13	0.00%
MAILsweeper	8	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (487,609 servers)
Version	Number of Servers	Percent
4.77	205,174	42.08%
4.69	191,567	39.29%
4.76	39,894	8.18%
4.72	21,115	4.33%
4.67	7,429	1.52%
4.63	5,611	1.15%
Other	16,819	3.45%
Postfix (260,456 servers)
Version	Number of Servers	Percent
Other	260,456	100.00%
Sendmail (127,914 servers)
Version	Number of Servers	Percent
8.13.8	32,990	25.79%
8.13.1	20,577	16.09%
8.14.3	17,206	13.45%
8.14.5	11,416	8.92%
8.14.4	11,143	8.71%
8.12.11.20060308	5,407	4.23%
8.13.6.20060614	4,143	3.24%
8.14.2	3,876	3.03%
8.11.6	2,784	2.18%
8.12.10	2,525	1.97%
8.14.1	2,220	1.74%
8.13.6	2,130	1.67%
8.12.11.20060614	1,927	1.51%
8.13.7	1,773	1.39%
8.12.11	1,569	1.23%
8.12.8	1,325	1.04%
Other	4,903	3.83%
Microsoft (117,985 servers)
Version	Number of Servers	Percent
6.0.3790.4675	93,624	79.35%
6.0.3790.3959	14,637	12.41%
6.0.3790.1830	4,081	3.46%
5.0.2195.7381	1,367	1.16%
7.5.7601.17514	1,186	1.01%
Other	3,090	2.62%
MailEnable (33,628 servers)
Version	Number of Servers	Percent
1.986--	8,634	25.68%
4.26--	2,562	7.62%
5.10--	2,467	7.34%
1.981--	1,657	4.93%
1.983--	1,022	3.04%
6.03--	923	2.74%
0-3.63-	789	2.35%
5.51--	751	2.23%
3.62--	733	2.18%
6.0--	725	2.16%
5.11--	657	1.95%
4.22--	437	1.30%
0-6.03-	423	1.26%
0-1.87-	404	1.20%
0-4.26-	383	1.14%
4.23--	383	1.14%
0-5.51-	351	1.04%
Other	10,327	30.71%
MDaemon (21,513 servers)
Version	Number of Servers	Percent
12.5.4	2,811	13.07%
11.0.3	2,635	12.25%
12.5.3	1,442	6.70%
11.0.0	1,321	6.14%
10.0.0	928	4.31%
10.1.2	903	4.20%
12.0.3	751	3.49%
10.1.1	730	3.39%
12.5.2	653	3.04%
9.6.1	560	2.60%
12.0.4	531	2.47%
9.6.6	507	2.36%
10.1.0	491	2.28%
9.5.2	353	1.64%
9.6.5	337	1.57%
9.6.2	333	1.55%
10.0.5	329	1.53%
12.5.0	301	1.40%
9.5.1	297	1.38%
12.5.1	287	1.33%
10.0.2	287	1.33%
9.5.6	278	1.29%
12.0.1	277	1.29%
12.0.0	275	1.28%
9.6.4	259	1.20%
8.1.3	237	1.10%
10.0.4	223	1.04%
9.0.4	222	1.03%
Other	2,955	13.74%
IMail (8,807 servers)
Version	Number of Servers	Percent
11.5	1,713	19.45%
8.22	1,620	18.39%
8.15	553	6.28%
9.23	541	6.14%
11.03	456	5.18%
11.01	399	4.53%
12.0.0.348	361	4.10%
8.05	347	3.94%
10.02	295	3.35%
11.02	278	3.16%
11.0	245	2.78%
7.07	217	2.46%
7.15	190	2.16%
6.06	168	1.91%
8.00	157	1.78%
10.01	143	1.62%
9.21	108	1.23%
9.10	93	1.06%
Other	923	10.48%
Lotus Domino (4,881 servers)
Version	Number of Servers	Percent
8.5.3	794	16.27%
8.5.2	444	9.10%
8.5.2FP2	338	6.92%
8.5.1	285	5.84%
7.0.2	239	4.90%
8.5.2FP3	205	4.20%
8.5	199	4.08%
7.0.3	141	2.89%
8.5.2FP1	141	2.89%
8.0.1	109	2.23%
8.5.1FP5	106	2.17%
7.0.1	103	2.11%
8.0.2	103	2.11%
6.5.4	96	1.97%
6.5.1	86	1.76%
6.5.3	81	1.66%
8.5.2FP4	78	1.60%
7.0	76	1.56%
8.0	70	1.43%
8.5.3FP1	65	1.33%
6.5.5	61	1.25%
6.5	61	1.25%
7.0.3FP1	60	1.23%
8.5.1FP3	59	1.21%
8.5.1FP4	51	1.04%
7.0.2FP2	51	1.04%
Other	779	15.96%
WinWebMail (3,899 servers)
Version	Number of Servers	Percent
3.8.1.3	846	21.70%
3.8.0.1	592	15.18%
3.7.6.1	472	12.11%
3.8.1.5	423	10.85%
3.7.3.1	322	8.26%
3.8.1.1	312	8.00%
3.7.7.3	303	7.77%
3.7.1.1	166	4.26%
3.7.5.1	116	2.98%
3.7.7.1	81	2.08%
3.6.3.1	75	1.92%
3.7.0.3	59	1.51%
3.7.0.5	58	1.49%
3.7.0.7	54	1.38%
Other	20	0.51%
CommuniGate Pro (3,353 servers)
Version	Number of Servers	Percent
5.1.16	265	7.90%
5.4.4	255	7.61%
4.1.8	157	4.68%
5.2.20	124	3.70%
5.4.1	118	3.52%
5.4.2	110	3.28%
5.4.3	110	3.28%
5.3.13	109	3.25%
5.2.16	88	2.62%
4.2.10	83	2.48%
5.1.12	72	2.15%
5.2.3	68	2.03%
5.0.14	67	2.00%
5.2.19	63	1.88%
5.4.0	61	1.82%
5.3.15	59	1.76%
5.3.8	58	1.73%
5.2.14	56	1.67%
5.3.12	56	1.67%
5.3.10	51	1.52%
5.1.13	48	1.43%
5.2.12	47	1.40%
5.3.9	46	1.37%
5.4	44	1.31%
5.2.8	41	1.22%
5.2.13	39	1.16%
Other	1,058	31.55%
XMail (2,362 servers)
Version	Number of Servers	Percent
1.22	539	22.82%
1.27	531	22.48%
1.25	450	19.05%
1.26	283	11.98%
1.24	224	9.48%
1.21	91	3.85%
1.23	55	2.33%
1.20	45	1.91%
1.17	34	1.44%
1.12	29	1.23%
Other	81	3.43%
Kerio (1,984 servers)
Version	Number of Servers	Percent
6.7.3	300	15.12%
6.6.2	198	9.98%
6.7.0	173	8.72%
6.5.2	137	6.91%
6.5.0	135	6.80%
6.7.2	120	6.05%
6.4.1	109	5.49%
6.7.1	107	5.39%
6.3.1	98	4.94%
6.6.0	74	3.73%
6.4.0	73	3.68%
6.5.1	70	3.53%
6.6.1	68	3.43%
6.4.2	43	2.17%
6.3.0	37	1.86%
6.2.0	25	1.26%
6.0.10	20	1.01%
6.1.4	20	1.01%
6.1.0	20	1.01%
Other	157	7.91%
Qmail Toaster (1,685 servers)
Version	Number of Servers	Percent
1.3	1,592	94.48%
1.2	57	3.38%
1.0	20	1.19%
Other	16	0.95%
Merak (1,494 servers)
Version	Number of Servers	Percent
8.0.3	614	41.10%
8.9.1	153	10.24%
8.5.0	110	7.36%
7.6.4	67	4.48%
8.3.8	65	4.35%
7.5.2	62	4.15%
7.4.5	56	3.75%
7.4.2	25	1.67%
9.0.0	25	1.67%
8.2.4	20	1.34%
7.2.0	20	1.34%
8.9.0	20	1.34%
7.6.1	20	1.34%
6.2.1	19	1.27%
8.3.15	19	1.27%
7.0.1	18	1.20%
4.4.2	17	1.14%
Other	164	10.98%
SurgeSMTP (1,170 servers)
Version	Number of Servers	Percent
5.3h2-2	312	26.67%
5.2a-1	146	12.48%
3.9e-1	84	7.18%
6.0a4-4	79	6.75%
4.0u4-4	36	3.08%
3.8k4-4	34	2.91%
6.0a3-3	27	2.31%
5.0e4-4	26	2.22%
5.3h-1	24	2.05%
4.2d2-2	22	1.88%
3.8i3-3	21	1.79%
4.3g2-2	20	1.71%
4.2d4-4	18	1.54%
3.9h-18	15	1.28%
5.1c2-2	15	1.28%
5.0e3-3	15	1.28%
3.6f5-5	15	1.28%
6.0a2-2	14	1.20%
4.3e-1	13	1.11%
4.3g4-4	13	1.11%
3.9c-1	13	1.11%
4.2a3-3	13	1.11%
3.7b8-8	12	1.03%
Other	183	15.64%
ArGoSoft (918 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	216	23.53%
1.8 (1.8.9.5)	143	15.58%
1.8 (1.8.9.3)	120	13.07%
1.8 (1.8.9.1)	85	9.26%
1.8 (1.8.8.8)	64	6.97%
1.8 (1.8.8.7)	51	5.56%
1.8 (1.8.9.2)	37	4.03%
1.8 (1.8.9.4)	24	2.61%
1.8 (1.8.6.0)	20	2.18%
1.8 (1.8.8.1)	16	1.74%
1.8 (1.8.8.9)	14	1.53%
1.8 (1.8.9.0)	10	1.09%
Other	118	12.85%
GroupWise (689 servers)
Version	Number of Servers	Percent
8.0.2	156	22.64%
7.0.3	139	20.17%
6.5.7	74	10.74%
7.0.4	52	7.55%
7.0.2	46	6.68%
8.0.1	36	5.22%
7.0.1	28	4.06%
6.5.4	25	3.63%
6.5.6	22	3.19%
6.5.1	19	2.76%
8.0.0	18	2.61%
6.0.4	18	2.61%
6.5.5	12	1.74%
7.0	8	1.16%
12.0.0	8	1.16%
Other	28	4.06%
Post.Office (427 servers)
Version	Number of Servers	Percent
3.5.3	60	14.05%
4.1.0.2	43	10.07%
4.0.1	33	7.73%
4.1.2.4	30	7.03%
4.1.1	22	5.15%
3.9.2.3	17	3.98%
3.5.3J	17	3.98%
3.8.3	14	3.28%
4.2	13	3.04%
4.1.0.3	11	2.58%
3.1.2J	11	2.58%
3.9.2	10	2.34%
3.1.2	9	2.11%
4.0.1.1	9	2.11%
4.1.0.4	9	2.11%
3.8.7.4	9	2.11%
3.6.2	8	1.87%
4.1.2.3	7	1.64%
4.2.1.1	7	1.64%
3.9.1.2	6	1.41%
4.1.2.2	6	1.41%
4.0.0.1	6	1.41%
3.9.2.1	6	1.41%
4.2.1	6	1.41%
3.9.1	6	1.41%
3.9.1.3	5	1.17%
4.0.0.2	5	1.17%
3.5.1	5	1.17%
Other	37	8.67%
Trend Micro (418 servers)
Version	Number of Servers	Percent
5.7	170	40.67%
5.5	103	24.64%
5.18	74	17.70%
7.0	42	10.05%
7.1	18	4.31%
Other	11	2.63%
Gordano Messaging Suite (GMS) (395 servers)
Version	Number of Servers	Percent
Other	395	100.00%
MagicMail (328 servers)
Version	Number of Servers	Percent
Other	328	100.00%
Mirapoint (193 servers)
Version	Number of Servers	Percent
3.10.10a-GA	19	9.84%
4.2.3-GA	18	9.33%
4.1.10-GA	12	6.22%
3.8.4-GA	12	6.22%
3.10.5-GA	11	5.70%
4.1.9-GA	11	5.70%
4.1.3-GA	10	5.18%
3.8.3-GA	10	5.18%
3.10.9-GA	10	5.18%
3.10.8-GA	9	4.66%
4.1.4-GA	6	3.11%
4.3.3-GA	6	3.11%
3.10.7-GA	6	3.11%
4.1.8-GA	6	3.11%
4.2.4-GA	5	2.59%
3.10.3-GA	5	2.59%
3.8.5-GA	4	2.07%
3.8.6-GA	4	2.07%
4.3.4-GA	4	2.07%
3.8.7a	3	1.55%
3.7.5a-GA	3	1.55%
4.1.5-GA	3	1.55%
3.8.2-GA	2	1.04%
3.7.1-GA	2	1.04%
4.0.5a	2	1.04%
3.10.4-GA	2	1.04%
Other	8	4.15%
VisNetic (157 servers)
Version	Number of Servers	Percent
9.3.2.0	47	29.94%
9.1.4.1	21	13.38%
8.5.0.8	10	6.37%
5.8.6.6	8	5.10%
5.5.8.3	8	5.10%
8.0.3.1	6	3.82%
7.6.1.0	6	3.82%
8.0.3	5	3.18%
6.2.2.0	4	2.55%
8.0.3.0	4	2.55%
7.2.4.1	4	2.55%
5.3.5.0	4	2.55%
5.0.2.3	4	2.55%
8.3.5.0	3	1.91%
5.4.5.4	3	1.91%
9.1.4.0	3	1.91%
5.0.2.1	2	1.27%
8.3.0.1	2	1.27%
Other	13	8.28%
InterScan VirusWall (153 servers)
Version	Number of Servers	Percent
Other	153	100.00%
Interscan (58 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	13	22.41%
3.81-Build_1022	10	17.24%
3.55 (build 1029)	8	13.79%
3.53 (build 2017)	5	8.62%
3.8-Build_3013	4	6.90%
3.81-Build_1084	4	6.90%
3.53 (build 1493)	3	5.17%
3.53 (build 2011)	3	5.17%
3.81-Build_1055	2	3.45%
3.53 (build 2013)	2	3.45%
3.5 (build 1294)	1	1.72%
3.51 (build 1337)	1	1.72%
3.8-Build_3045	1	1.72%
3.8-Build_1080	1	1.72%
Other	0	0.00%
NetIQ MailMarshal (55 servers)
Version	Number of Servers	Percent
6.0.3.8	39	70.91%
5.5.6.7	6	10.91%
5.5.6.5	2	3.64%
5.5.6.6	2	3.64%
6.1.3.15	2	3.64%
5.5.5.9	1	1.82%
5.5.4.17	1	1.82%
5.5.4.16	1	1.82%
5.5.3.17	1	1.82%
Other	0	0.00%
Mercury (54 servers)
Version	Number of Servers	Percent
1.48	28	51.85%
3.32	15	27.78%
3.01a	2	3.70%
1.47	2	3.70%
3.21c	2	3.70%
3.30	2	3.70%
3.21	1	1.85%
1.44	1	1.85%
4.x	1	1.85%
Other	0	0.00%
WebSTAR V (39 servers)
Version	Number of Servers	Percent
5.4.1	19	48.72%
5.4.0	9	23.08%
5.3.4	6	15.38%
5.3.3	4	10.26%
5.3.2	1	2.56%
Other	0	0.00%
Neon Mail Server (36 servers)
Version	Number of Servers	Percent
3.0.7	10	27.78%
3.1.3	7	19.44%
3.1.0	5	13.89%
3.1.4	4	11.11%
3.1.2	3	8.33%
3.0.9	3	8.33%
3.1.1	1	2.78%
3.0.8	1	2.78%
3.1.5	1	2.78%
3.0.6	1	2.78%
Other	0	0.00%
OpenVMS (24 servers)
Version	Number of Servers	Percent
8.3	10	41.67%
7.3	6	25.00%
8.4	5	20.83%
6.1	1	4.17%
7.2	1	4.17%
8.2	1	4.17%
Other	0	0.00%
MessageWall (20 servers)
Version	Number of Servers	Percent
1.0.8	19	95.00%
1.0.6	1	5.00%
Other	0	0.00%
OpenSMTPD (16 servers)
Version	Number of Servers	Percent
Other	16	100.00%
ModusMail (16 servers)
Version	Number of Servers	Percent
4.35.477.0	8	50.00%
4.35.480.0	2	12.50%
4.1.361.21	1	6.25%
3.2.315.0	1	6.25%
4.0.340.3	1	6.25%
4.3.459.0	1	6.25%
4.35.477.8	1	6.25%
3.1.302.0	1	6.25%
Other	0	0.00%
WebSTAR (13 servers)
Version	Number of Servers	Percent
Other	13	100.00%
MAILsweeper (8 servers)
Version	Number of Servers	Percent
4.3.17.0	3	37.50%
4.3.20.0	2	25.00%
4.3.19.0	2	25.00%
4.3.1.0	1	12.50%
Other	0	0.00%