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	2,124,187	100.0%
Number of Servers that didn't respond	351,865	16.56%
Server didn't open socket	338,659	15.94%
Server didn't provide banner	13,206	0.62%
Server provided banner	1,772,322	83.44%
Server banner identifies software in use	973,398	45.82%

As indicated by the above table, of the 2,124,187 servers queried, only 973,398 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	337,556	34.68%
Postfix	206,872	21.25%
Microsoft	170,616	17.53%
Sendmail	158,198	16.25%
MailEnable	30,518	3.14%
MDaemon	22,499	2.31%
IMail	13,016	1.34%
Lotus Domino	5,271	0.54%
WinWebMail	4,918	0.51%
Kerio	4,632	0.48%
CommuniGate Pro	3,862	0.40%
Merak	2,657	0.27%
XMail	2,596	0.27%
Qmail Toaster	1,740	0.18%
ArGoSoft	1,444	0.15%
SurgeSMTP	1,418	0.15%
GroupWise	1,341	0.14%
Trend Micro	954	0.10%
Gordano Messaging Suite (GMS)	578	0.06%
Post.Office	564	0.06%
MagicMail	463	0.05%
Mirapoint	404	0.04%
VisNetic	297	0.03%
InterScan VirusWall	296	0.03%
NetIQ MailMarshal	165	0.02%
Interscan	130	0.01%
Mercury	88	0.01%
WebSTAR V	80	0.01%
Neon Mail Server	76	0.01%
MessageWall	34	0.00%
ModusMail	33	0.00%
WebSTAR	29	0.00%
OpenVMS	25	0.00%
MAILsweeper	21	0.00%
OpenSMTPD	7	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (337,556 servers)
Version	Number of Servers	Percent
4.69	287,217	85.09%
4.67	14,281	4.23%
4.63	12,539	3.71%
4.71	6,476	1.92%
Other	17,043	5.05%
Postfix (206,872 servers)
Version	Number of Servers	Percent
Other	206,872	100.00%
Microsoft (170,616 servers)
Version	Number of Servers	Percent
6.0.3790.4675	96,372	56.48%
6.0.3790.3959	54,710	32.07%
6.0.3790.1830	10,725	6.29%
5.0.2195.6713	2,881	1.69%
5.0.2195.7381	2,516	1.47%
Other	3,412	2.00%
Sendmail (158,198 servers)
Version	Number of Servers	Percent
8.13.1	29,940	18.93%
8.13.8	26,833	16.96%
8.14.3	15,171	9.59%
8.14.4	13,709	8.67%
8.12.11.20060308	12,103	7.65%
8.12.11.20060614	11,935	7.54%
8.13.6.20060614	6,047	3.82%
8.12.10	5,385	3.40%
8.13.6	5,024	3.18%
8.11.6	5,009	3.17%
8.14.2	4,992	3.16%
8.14.1	3,741	2.36%
8.12.11	3,425	2.17%
8.13.4	2,811	1.78%
8.13.7	2,774	1.75%
8.12.8	2,343	1.48%
Other	6,956	4.40%
MailEnable (30,518 servers)
Version	Number of Servers	Percent
1.986--	9,671	31.69%
1.981--	3,169	10.38%
1.983--	2,041	6.69%
3.62--	1,297	4.25%
0-3.63-	885	2.90%
4.22--	838	2.75%
4.23--	631	2.07%
1.96--	581	1.90%
1.95--	541	1.77%
1.9--	456	1.49%
0-2.53-	450	1.47%
0-4.22-	442	1.45%
0-1.87-	427	1.40%
4.17--	395	1.29%
0-3.61-	381	1.25%
--3.63	374	1.23%
0-3.6-	353	1.16%
0-3.14-	328	1.07%
4.23--4.23	325	1.06%
0-4.23-	320	1.05%
4.0--	320	1.05%
4.14--	319	1.05%
Other	5,974	19.58%
MDaemon (22,499 servers)
Version	Number of Servers	Percent
10.1.2	2,273	10.10%
11.0.3	2,248	9.99%
11.0.2	1,528	6.79%
10.0.0	1,348	5.99%
10.1.1	1,250	5.56%
11.0.0	1,162	5.16%
9.6.1	886	3.94%
9.6.6	819	3.64%
11.0.1	769	3.42%
10.1.0	745	3.31%
10.0.5	608	2.70%
9.6.5	587	2.61%
9.5.2	570	2.53%
10.0.2	500	2.22%
10.0.4	494	2.20%
9.5.1	471	2.09%
9.6.4	463	2.06%
9.6.2	447	1.99%
8.1.3	436	1.94%
9.5.6	427	1.90%
9.0.4	379	1.68%
9.6.3	264	1.17%
9.5.5	261	1.16%
6.8.5	257	1.14%
7.2.3	243	1.08%
9.0.1	231	1.03%
Other	2,833	12.59%
IMail (13,016 servers)
Version	Number of Servers	Percent
8.22	2,468	18.96%
8.15	1,295	9.95%
11.01	1,082	8.31%
9.23	952	7.31%
11.02	844	6.48%
8.05	628	4.82%
10.02	618	4.75%
11.0	603	4.63%
9.20	499	3.83%
9.10	493	3.79%
7.07	398	3.06%
9.21	359	2.76%
7.15	290	2.23%
10.01	276	2.12%
8.00	270	2.07%
6.06	256	1.97%
8.04	214	1.64%
8.21	144	1.11%
8.10	141	1.08%
Other	1,186	9.11%
Lotus Domino (5,271 servers)
Version	Number of Servers	Percent
8.5.1	624	11.84%
8.5	442	8.39%
7.0.2	366	6.94%
8.5.1FP3	266	5.05%
8.0.2	239	4.53%
8.5.1FP2	224	4.25%
7.0.3	221	4.19%
8.0.1	206	3.91%
7.0.1	195	3.70%
6.5.4	172	3.26%
6.5.1	163	3.09%
6.5.3	142	2.69%
7.0.3FP1	138	2.62%
6.5.5	121	2.30%
8.0	120	2.28%
7.0.2FP2	116	2.20%
7.0	113	2.14%
8.5.1FP1	113	2.14%
8.5FP1	112	2.12%
6.5	91	1.73%
5.0.11	65	1.23%
7.0.2FP3	54	1.02%
Other	968	18.36%
WinWebMail (4,918 servers)
Version	Number of Servers	Percent
3.8.0.1	1,306	26.56%
3.7.6.1	852	17.32%
3.7.7.3	612	12.44%
3.7.3.1	609	12.38%
3.8.1.1	336	6.83%
3.7.1.1	311	6.32%
3.7.5.1	214	4.35%
3.7.7.1	158	3.21%
3.6.3.1	151	3.07%
3.7.0.5	136	2.77%
3.7.0.3	104	2.11%
3.7.0.7	96	1.95%
Other	33	0.67%
Kerio (4,632 servers)
Version	Number of Servers	Percent
6.7.3	794	17.14%
6.6.2	514	11.10%
6.7.2	485	10.47%
6.7.0	485	10.47%
6.5.0	277	5.98%
6.7.1	261	5.63%
6.5.2	248	5.35%
6.4.1	203	4.38%
6.3.1	196	4.23%
6.6.0	148	3.20%
6.5.1	141	3.04%
6.4.0	139	3.00%
6.4.2	111	2.40%
6.6.1	103	2.22%
6.3.0	83	1.79%
Other	444	9.59%
CommuniGate Pro (3,862 servers)
Version	Number of Servers	Percent
5.1.16	238	6.16%
4.1.8	217	5.62%
5.2.16	202	5.23%
5.3.7	163	4.22%
5.3.8	151	3.91%
4.2.10	151	3.91%
5.2.19	111	2.87%
5.2.14	105	2.72%
5.3.5	102	2.64%
5.1.12	95	2.46%
5.2.3	93	2.41%
5.2.12	91	2.36%
5.3.2	83	2.15%
5.2.8	82	2.12%
5.0.14	80	2.07%
5.1.13	76	1.97%
5.2.13	71	1.84%
5.2.10	68	1.76%
5.2.18	68	1.76%
5.2.20	56	1.45%
5.1.14	55	1.42%
5.2.9	52	1.35%
5.2.11	50	1.29%
5.3.4	48	1.24%
5.1.9	47	1.22%
5.2.0	45	1.17%
5.0.9	45	1.17%
5.2.6	42	1.09%
5.2.17	40	1.04%
Other	1,135	29.39%
Merak (2,657 servers)
Version	Number of Servers	Percent
8.0.3	1,124	42.30%
8.9.1	260	9.79%
8.5.0	161	6.06%
7.4.5	134	5.04%
7.5.2	120	4.52%
7.6.4	107	4.03%
8.3.8	102	3.84%
7.4.2	46	1.73%
8.2.13	44	1.66%
9.0.0	36	1.35%
7.2.0	33	1.24%
7.6.1	32	1.20%
8.2.4	29	1.09%
8.3.15	29	1.09%
7.0.1	28	1.05%
8.9.0	27	1.02%
Other	345	12.98%
XMail (2,596 servers)
Version	Number of Servers	Percent
1.25	643	24.77%
1.22	618	23.81%
1.26	350	13.48%
1.24	340	13.10%
1.27	147	5.66%
1.21	140	5.39%
1.23	70	2.70%
1.20	67	2.58%
1.17	62	2.39%
1.12	50	1.93%
Other	109	4.20%
Qmail Toaster (1,740 servers)
Version	Number of Servers	Percent
1.3	1,592	91.49%
1.2	110	6.32%
1.0	28	1.61%
Other	10	0.57%
ArGoSoft (1,444 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	274	18.98%
1.8 (1.8.9.5)	242	16.76%
1.8 (1.8.9.3)	185	12.81%
1.8 (1.8.9.1)	131	9.07%
1.8 (1.8.8.8)	111	7.69%
1.8 (1.8.8.7)	89	6.16%
1.8 (1.8.9.2)	58	4.02%
1.8 (1.8.9.4)	44	3.05%
1.8 (1.8.8.9)	32	2.22%
1.8 (1.8.8.1)	31	2.15%
1.8 (1.8.9.0)	25	1.73%
1.8 (1.8.6.0)	20	1.39%
Other	202	13.99%
SurgeSMTP (1,418 servers)
Version	Number of Servers	Percent
4.2d4-4	186	13.12%
3.9e-1	153	10.79%
4.3e-1	131	9.24%
4.3g2-2	126	8.89%
4.3g-1	89	6.28%
4.2d2-2	82	5.78%
3.8k4-4	82	5.78%
4.0u4-4	80	5.64%
3.8i3-3	35	2.47%
4.2a3-3	33	2.33%
3.7b8-8	31	2.19%
3.8f3-3	27	1.90%
3.6f5-5	27	1.90%
4.3g4-4	26	1.83%
3.9c-1	25	1.76%
3.8f2-2	18	1.27%
5.0e-1	15	1.06%
3.9g2-2	15	1.06%
Other	237	16.71%
GroupWise (1,341 servers)
Version	Number of Servers	Percent
7.0.3	379	28.26%
8.0.1	193	14.39%
6.5.7	161	12.01%
7.0.2	153	11.41%
6.5.4	76	5.67%
7.0.1	76	5.67%
6.5.6	52	3.88%
8.0.0	45	3.36%
6.0.4	41	3.06%
6.5.1	36	2.68%
7.0.4	21	1.57%
6.5.5	20	1.49%
7.0	15	1.12%
Other	73	5.44%
Trend Micro (954 servers)
Version	Number of Servers	Percent
5.7	432	45.28%
5.5	270	28.30%
5.18	146	15.30%
7.0	73	7.65%
7	14	1.47%
Other	19	1.99%
Gordano Messaging Suite (GMS) (578 servers)
Version	Number of Servers	Percent
Other	578	100.00%
Post.Office (564 servers)
Version	Number of Servers	Percent
3.5.3	93	16.49%
4.1.0.2	68	12.06%
4.0.1	47	8.33%
3.5.3J	37	6.56%
4.1.1	32	5.67%
3.8.3	27	4.79%
4.1.0.4	19	3.37%
3.9.2.3	17	3.01%
3.1.2J	17	3.01%
3.9.1	15	2.66%
3.6.3	14	2.48%
3.6.2	13	2.30%
3.9.2	12	2.13%
3.1.2	11	1.95%
3.9.0	10	1.77%
4.0.1.1	10	1.77%
3.8.7.4	10	1.77%
4.0.0.2	10	1.77%
4.1.0.3	9	1.60%
4.1	9	1.60%
4.0.0.1	9	1.60%
3.9.2.1	8	1.42%
3.5.2	8	1.42%
3.9.1.2	6	1.06%
Other	53	9.40%
MagicMail (463 servers)
Version	Number of Servers	Percent
Other	463	100.00%
Mirapoint (404 servers)
Version	Number of Servers	Percent
3.8.4-GA	44	10.89%
3.10.5-GA	35	8.66%
3.10.8-GA	35	8.66%
3.8.3-GA	30	7.43%
3.10.7-GA	29	7.18%
3.10.9-GA	28	6.93%
3.10.4-GA	23	5.69%
4.1.9-GA	18	4.46%
4.1.3-GA	17	4.21%
4.1.8-GA	17	4.21%
3.10.6-GA	15	3.71%
3.10.3-GA	13	3.22%
3.8.7a	11	2.72%
3.8.2-GA	9	2.23%
4.1.4-GA	9	2.23%
3.8.5-GA	8	1.98%
3.8.6-GA	8	1.98%
4.1.5-GA	8	1.98%
3.10.2-GA	7	1.73%
4.0.5a	6	1.49%
3.7.5a-GA	6	1.49%
3.7.3a-GA	5	1.24%
Other	23	5.69%
VisNetic (297 servers)
Version	Number of Servers	Percent
9.3.2.0	106	35.69%
9.1.4.1	43	14.48%
5.8.6.6	16	5.39%
8.5.0.8	14	4.71%
5.5.8.3	11	3.70%
8.0.3.1	10	3.37%
7.6.1.0	9	3.03%
6.2.2.0	8	2.69%
8.0.3.0	8	2.69%
8.3.6	6	2.02%
8.3.5.0	6	2.02%
5.3.5.0	6	2.02%
9.1.4.0	6	2.02%
8.0.3	6	2.02%
5.4.5.4	5	1.68%
7.2.4.1	5	1.68%
5.0.2.3	4	1.35%
7.2.4.0	4	1.35%
5.8.6.4	3	1.01%
7.5.3.0	3	1.01%
Other	18	6.06%
InterScan VirusWall (296 servers)
Version	Number of Servers	Percent
Other	296	100.00%
NetIQ MailMarshal (165 servers)
Version	Number of Servers	Percent
6.0.3.8	121	73.33%
5.5.6.7	13	7.88%
6.1.3.15	12	7.27%
5.5.6.6	4	2.42%
5.5.4.16	4	2.42%
5.5.6.5	3	1.82%
5.5.3.17	2	1.21%
Other	6	3.64%
Interscan (130 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	20	15.38%
3.81-Build_1022	20	15.38%
3.53 (build 2017)	16	12.31%
3.55 (build 1029)	15	11.54%
3.81-Build_1084	10	7.69%
3.8-Build_3013	9	6.92%
3.53 (build 1493)	6	4.62%
3.53 (build 2011)	6	4.62%
3.55 (build 1020)	6	4.62%
3.52 (build 1375)	4	3.08%
3.53 (build 2013)	3	2.31%
3.53 (build 1494)	2	1.54%
3.8-Build_1080	2	1.54%
Other	11	8.46%
Mercury (88 servers)
Version	Number of Servers	Percent
1.48	47	53.41%
3.32	23	26.14%
3.21c	8	9.09%
3.01a	2	2.27%
1.47	2	2.27%
3.30	2	2.27%
3.21	1	1.14%
1.44	1	1.14%
3.31	1	1.14%
1.49	1	1.14%
Other	0	0.00%
WebSTAR V (80 servers)
Version	Number of Servers	Percent
5.4.1	26	32.50%
5.4.0	21	26.25%
5.3.4	18	22.50%
5.3.2	7	8.75%
5.3.3	5	6.25%
5.3.0	1	1.25%
5.2.3	1	1.25%
5.3.1	1	1.25%
Other	0	0.00%
Neon Mail Server (76 servers)
Version	Number of Servers	Percent
3.1.3	19	25.00%
3.0.7	16	21.05%
3.0.9	11	14.47%
3.1.4	10	13.16%
3.1.2	7	9.21%
3.1.5	4	5.26%
3.1.0	4	5.26%
3.1.1	3	3.95%
3.0.8	1	1.32%
3.0.6	1	1.32%
Other	0	0.00%
MessageWall (34 servers)
Version	Number of Servers	Percent
1.0.8	31	91.18%
1.0.11	1	2.94%
1.0.6	1	2.94%
1.1.0	1	2.94%
Other	0	0.00%
ModusMail (33 servers)
Version	Number of Servers	Percent
4.35.477.0	9	27.27%
4.35.480.0	5	15.15%
4.2.420.0	5	15.15%
4.1.361.21	2	6.06%
3.2.315.0	2	6.06%
3.1.293.1	2	6.06%
3.1.302.0	2	6.06%
4.35.480.11	2	6.06%
4.2.425.22	1	3.03%
4.0.340.3	1	3.03%
4.3.459.0	1	3.03%
4.35.477.8	1	3.03%
Other	0	0.00%
WebSTAR (29 servers)
Version	Number of Servers	Percent
Other	29	100.00%
OpenVMS (25 servers)
Version	Number of Servers	Percent
8.3	15	60.00%
7.3	6	24.00%
8.2	2	8.00%
6.1	1	4.00%
7.2	1	4.00%
Other	0	0.00%
MAILsweeper (21 servers)
Version	Number of Servers	Percent
4.3.20.0	6	28.57%
4.3.17.0	4	19.05%
4.3.6.0	4	19.05%
4.3.14.0	3	14.29%
4.3.19.0	1	4.76%
4.3.10.0	1	4.76%
4.3.1.0	1	4.76%
4.2.5.0	1	4.76%
Other	0	0.00%
OpenSMTPD (7 servers)
Version	Number of Servers	Percent
Other	7	100.00%