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	2,309,454	100.0%
Number of Servers that didn't respond	379,263	16.42%
Server didn't open socket	366,981	15.89%
Server didn't provide banner	12,282	0.53%
Server provided banner	1,930,191	83.58%
Server banner identifies software in use	1,052,508	45.57%

As indicated by the above table, of the 2,309,454 servers queried, only 1,052,508 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	440,573	41.86%
Postfix	243,732	23.16%
Microsoft	138,802	13.19%
Sendmail	136,105	12.93%
MailEnable	33,467	3.18%
MDaemon	22,040	2.09%
IMail	10,184	0.97%
Lotus Domino	5,090	0.48%
WinWebMail	4,309	0.41%
CommuniGate Pro	3,527	0.34%
Kerio	2,474	0.24%
XMail	2,450	0.23%
Merak	1,843	0.18%
Qmail Toaster	1,742	0.17%
SurgeSMTP	1,272	0.12%
ArGoSoft	1,086	0.10%
GroupWise	883	0.08%
Trend Micro	542	0.05%
Post.Office	466	0.04%
Gordano Messaging Suite (GMS)	458	0.04%
MagicMail	373	0.04%
Mirapoint	249	0.02%
VisNetic	216	0.02%
InterScan VirusWall	195	0.02%
NetIQ MailMarshal	83	0.01%
Interscan	82	0.01%
Mercury	64	0.01%
Neon Mail Server	52	0.00%
WebSTAR V	46	0.00%
MessageWall	22	0.00%
OpenVMS	21	0.00%
WebSTAR	19	0.00%
ModusMail	18	0.00%
OpenSMTPD	14	0.00%
MAILsweeper	9	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (440,573 servers)
Version	Number of Servers	Percent
4.69	350,391	79.53%
4.76	36,362	8.25%
4.72	21,101	4.79%
4.67	9,614	2.18%
4.63	6,074	1.38%
4.71	4,525	1.03%
Other	12,506	2.84%
Postfix (243,732 servers)
Version	Number of Servers	Percent
Other	243,732	100.00%
Microsoft (138,802 servers)
Version	Number of Servers	Percent
6.0.3790.4675	106,056	76.41%
6.0.3790.3959	20,774	14.97%
6.0.3790.1830	5,742	4.14%
5.0.2195.7381	1,810	1.30%
Other	4,420	3.18%
Sendmail (136,105 servers)
Version	Number of Servers	Percent
8.13.8	32,192	23.65%
8.13.1	23,689	17.40%
8.14.4	18,816	13.82%
8.14.3	18,205	13.38%
8.12.11.20060308	6,408	4.71%
8.13.6.20060614	4,725	3.47%
8.14.2	3,844	2.82%
8.11.6	3,381	2.48%
8.12.10	3,262	2.40%
8.13.6	2,805	2.06%
8.14.1	2,761	2.03%
8.12.11.20060614	2,468	1.81%
8.13.7	2,052	1.51%
8.12.11	1,925	1.41%
8.12.8	1,635	1.20%
8.13.4	1,596	1.17%
8.14.5	1,412	1.04%
Other	4,929	3.62%
MailEnable (33,467 servers)
Version	Number of Servers	Percent
1.986--	10,094	30.16%
4.26--	2,715	8.11%
1.981--	2,072	6.19%
1.983--	1,320	3.94%
5.10--	1,083	3.24%
0-3.63-	895	2.67%
3.62--	892	2.67%
5.11--	753	2.25%
0-4.26-	549	1.64%
4.22--	539	1.61%
4.23--	498	1.49%
0-1.87-	427	1.28%
0-2.53-	403	1.20%
1.95--	382	1.14%
1.96--	377	1.13%
0-5.51-	376	1.12%
--3.63	365	1.09%
4.14--	355	1.06%
Other	9,372	28.00%
MDaemon (22,040 servers)
Version	Number of Servers	Percent
11.0.3	3,221	14.61%
12.0.3	2,555	11.59%
12.0.4	1,905	8.64%
11.0.0	1,229	5.58%
10.1.2	1,086	4.93%
10.0.0	1,049	4.76%
10.1.1	841	3.82%
9.6.1	665	3.02%
9.6.6	609	2.76%
12.0.1	553	2.51%
10.1.0	523	2.37%
9.6.5	403	1.83%
9.5.2	401	1.82%
12.0.0	394	1.79%
10.0.5	384	1.74%
10.0.2	367	1.67%
9.6.2	352	1.60%
9.5.1	342	1.55%
9.5.6	324	1.47%
12.0.2	324	1.47%
9.6.4	316	1.43%
10.0.4	296	1.34%
8.1.3	296	1.34%
9.0.4	262	1.19%
11.0.2	251	1.14%
Other	3,092	14.03%
IMail (10,184 servers)
Version	Number of Servers	Percent
8.22	1,935	19.00%
11.5	1,104	10.84%
8.15	725	7.12%
11.03	709	6.96%
9.23	584	5.73%
11.01	510	5.01%
11.02	444	4.36%
8.05	431	4.23%
9.10	402	3.95%
9.20	373	3.66%
11.0	314	3.08%
10.02	310	3.04%
7.07	265	2.60%
9.21	233	2.29%
7.15	233	2.29%
8.00	199	1.95%
6.06	176	1.73%
10.01	150	1.47%
8.04	122	1.20%
Other	965	9.48%
Lotus Domino (5,090 servers)
Version	Number of Servers	Percent
8.5.2	597	11.73%
8.5.2FP2	523	10.28%
8.5.1	369	7.25%
7.0.2	289	5.68%
8.5.2FP1	265	5.21%
8.5	247	4.85%
8.5.2FP3	204	4.01%
7.0.3	161	3.16%
8.0.1	136	2.67%
8.0.2	133	2.61%
7.0.1	123	2.42%
6.5.4	117	2.30%
8.5.1FP5	115	2.26%
6.5.1	110	2.16%
8.5.1FP3	100	1.96%
6.5.3	94	1.85%
8.0	89	1.75%
7.0	85	1.67%
6.5.5	81	1.59%
7.0.2FP2	79	1.55%
8.5.1FP4	70	1.38%
8.5.1FP2	69	1.36%
6.5	66	1.30%
7.0.3FP1	65	1.28%
Other	903	17.74%
WinWebMail (4,309 servers)
Version	Number of Servers	Percent
3.8.1.3	969	22.49%
3.8.0.1	784	18.19%
3.7.6.1	594	13.79%
3.8.1.1	400	9.28%
3.7.3.1	395	9.17%
3.7.7.3	385	8.93%
3.7.1.1	197	4.57%
3.7.5.1	140	3.25%
3.7.7.1	116	2.69%
3.6.3.1	98	2.27%
3.7.0.5	74	1.72%
3.7.0.3	73	1.69%
3.7.0.7	57	1.32%
Other	27	0.63%
CommuniGate Pro (3,527 servers)
Version	Number of Servers	Percent
5.1.16	274	7.77%
4.1.8	183	5.19%
5.3.13	170	4.82%
5.4.1	163	4.62%
5.2.20	127	3.60%
5.4.0	125	3.54%
5.3.8	105	2.98%
4.2.10	102	2.89%
5.2.16	97	2.75%
5.2.19	83	2.35%
5.3.12	80	2.27%
5.2.3	74	2.10%
5.1.12	74	2.10%
5.0.14	70	1.98%
5.3.10	68	1.93%
5.2.14	66	1.87%
5.4	65	1.84%
5.3.9	63	1.79%
5.3.14	62	1.76%
5.2.12	60	1.70%
5.3.11	59	1.67%
5.2.8	53	1.50%
5.1.13	51	1.45%
5.2.13	42	1.19%
5.3.7	42	1.19%
5.1.14	40	1.13%
5.2.0	38	1.08%
5.3.2	38	1.08%
5.2.10	36	1.02%
5.3.5	36	1.02%
5.2.18	36	1.02%
Other	945	26.79%
Kerio (2,474 servers)
Version	Number of Servers	Percent
6.7.3	352	14.23%
6.6.2	269	10.87%
6.7.0	216	8.73%
6.5.0	170	6.87%
6.7.2	169	6.83%
6.5.2	156	6.31%
6.7.1	132	5.34%
6.4.1	128	5.17%
6.3.1	123	4.97%
6.4.0	96	3.88%
6.6.0	93	3.76%
6.5.1	86	3.48%
6.6.1	74	2.99%
6.4.2	59	2.38%
6.3.0	42	1.70%
6.2.0	30	1.21%
6.1.3	26	1.05%
6.2.2	26	1.05%
6.1.2	25	1.01%
6.1.0	25	1.01%
Other	177	7.15%
XMail (2,450 servers)
Version	Number of Servers	Percent
1.22	592	24.16%
1.25	497	20.29%
1.27	394	16.08%
1.26	312	12.73%
1.24	260	10.61%
1.21	108	4.41%
1.23	59	2.41%
1.20	55	2.24%
1.17	44	1.80%
1.12	34	1.39%
Other	95	3.88%
Merak (1,843 servers)
Version	Number of Servers	Percent
8.0.3	747	40.53%
8.9.1	180	9.77%
8.5.0	135	7.33%
7.5.2	82	4.45%
7.6.4	75	4.07%
8.3.8	71	3.85%
7.4.5	64	3.47%
8.2.13	48	2.60%
9.0.0	32	1.74%
7.4.2	29	1.57%
8.2.4	25	1.36%
7.2.0	24	1.30%
8.3.15	24	1.30%
7.6.1	23	1.25%
7.0.1	22	1.19%
8.9.0	20	1.09%
6.2.1	19	1.03%
Other	223	12.10%
Qmail Toaster (1,742 servers)
Version	Number of Servers	Percent
1.3	1,627	93.40%
1.2	78	4.48%
1.0	23	1.32%
Other	14	0.80%
SurgeSMTP (1,272 servers)
Version	Number of Servers	Percent
5.2a-1	254	19.97%
5.3h2-2	183	14.39%
3.9e-1	104	8.18%
4.2d4-4	90	7.08%
5.3h-1	52	4.09%
4.0u4-4	52	4.09%
5.0e4-4	50	3.93%
3.8k4-4	45	3.54%
4.2d2-2	29	2.28%
3.8i3-3	24	1.89%
4.3g2-2	23	1.81%
5.0e3-3	22	1.73%
3.7b8-8	18	1.42%
4.3g4-4	17	1.34%
5.1c2-2	17	1.34%
3.6f5-5	17	1.34%
3.9h-18	15	1.18%
3.9c-1	15	1.18%
4.3e-1	14	1.10%
4.2a3-3	14	1.10%
5.1c-1	14	1.10%
Other	203	15.96%
ArGoSoft (1,086 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	251	23.11%
1.8 (1.8.9.5)	172	15.84%
1.8 (1.8.9.3)	140	12.89%
1.8 (1.8.9.1)	101	9.30%
1.8 (1.8.8.8)	85	7.83%
1.8 (1.8.8.7)	60	5.52%
1.8 (1.8.9.2)	40	3.68%
1.8 (1.8.9.4)	28	2.58%
1.8 (1.8.8.1)	18	1.66%
1.8 (1.8.6.0)	17	1.57%
1.8 (1.8.8.9)	17	1.57%
1.8 (1.8.8.2)	13	1.20%
1.8 (1.8.9.0)	13	1.20%
Other	131	12.06%
GroupWise (883 servers)
Version	Number of Servers	Percent
7.0.3	201	22.76%
8.0.2	175	19.82%
6.5.7	93	10.53%
7.0.2	72	8.15%
8.0.1	60	6.80%
7.0.4	52	5.89%
6.5.4	41	4.64%
7.0.1	35	3.96%
6.5.6	27	3.06%
6.0.4	26	2.94%
6.5.1	22	2.49%
8.0.0	17	1.93%
6.5.5	15	1.70%
7.0	13	1.47%
Other	34	3.85%
Trend Micro (542 servers)
Version	Number of Servers	Percent
5.7	226	41.70%
5.5	138	25.46%
5.18	97	17.90%
7.0	48	8.86%
7.1	18	3.32%
Other	15	2.77%
Post.Office (466 servers)
Version	Number of Servers	Percent
3.5.3	77	16.52%
4.1.0.2	52	11.16%
4.0.1	41	8.80%
4.1.2.4	32	6.87%
4.1.1	22	4.72%
3.5.3J	21	4.51%
3.8.3	16	3.43%
3.9.2.3	15	3.22%
3.9.2	13	2.79%
3.1.2J	11	2.36%
4.1.0.3	10	2.15%
3.8.7.4	10	2.15%
3.1.2	9	1.93%
3.6.2	9	1.93%
4.1.0.4	9	1.93%
4.0.1.1	8	1.72%
3.9.1	8	1.72%
3.9.2.1	8	1.72%
4.1	7	1.50%
4.1.2.2	7	1.50%
4.1.2.3	7	1.50%
4.0.0.2	7	1.50%
4.0.0.1	6	1.29%
3.5.2	6	1.29%
3.9.1.2	5	1.07%
3.9.1.3	5	1.07%
Other	45	9.66%
Gordano Messaging Suite (GMS) (458 servers)
Version	Number of Servers	Percent
Other	458	100.00%
MagicMail (373 servers)
Version	Number of Servers	Percent
Other	373	100.00%
Mirapoint (249 servers)
Version	Number of Servers	Percent
4.2.3-GA	28	11.24%
3.10.10a-GA	23	9.24%
3.8.4-GA	22	8.84%
3.10.5-GA	19	7.63%
3.8.3-GA	17	6.83%
3.10.8-GA	14	5.62%
4.1.10-GA	13	5.22%
3.10.7-GA	12	4.82%
4.1.3-GA	11	4.42%
3.10.9-GA	10	4.02%
4.1.9-GA	9	3.61%
4.1.8-GA	8	3.21%
4.1.4-GA	6	2.41%
3.8.7a	6	2.41%
3.10.3-GA	6	2.41%
3.10.4-GA	5	2.01%
3.8.5-GA	5	2.01%
3.8.2-GA	5	2.01%
3.10.6-GA	5	2.01%
3.7.3a-GA	3	1.20%
3.8.6-GA	3	1.20%
4.1.5-GA	3	1.20%
Other	16	6.43%
VisNetic (216 servers)
Version	Number of Servers	Percent
9.3.2.0	73	33.80%
9.1.4.1	29	13.43%
5.8.6.6	15	6.94%
8.5.0.8	12	5.56%
8.0.3.1	8	3.70%
5.5.8.3	8	3.70%
6.2.2.0	6	2.78%
8.0.3	6	2.78%
5.0.2.3	6	2.78%
7.6.1.0	6	2.78%
8.3.5.0	5	2.31%
8.0.3.0	5	2.31%
9.1.4.0	5	2.31%
5.0.2.1	4	1.85%
7.2.4.1	4	1.85%
5.3.5.0	3	1.39%
Other	21	9.72%
InterScan VirusWall (195 servers)
Version	Number of Servers	Percent
Other	195	100.00%
NetIQ MailMarshal (83 servers)
Version	Number of Servers	Percent
6.0.3.8	56	67.47%
5.5.6.7	7	8.43%
6.1.3.15	6	7.23%
5.5.4.16	4	4.82%
5.5.6.6	3	3.61%
5.5.6.5	2	2.41%
6.5.4.7535	1	1.20%
5.5.5.9	1	1.20%
5.5.4.17	1	1.20%
5.5.3.17	1	1.20%
5.5.5.6	1	1.20%
Other	0	0.00%
Interscan (82 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	17	20.73%
3.81-Build_1022	10	12.20%
3.53 (build 2017)	9	10.98%
3.55 (build 1029)	9	10.98%
3.8-Build_3013	7	8.54%
3.81-Build_1084	6	7.32%
3.53 (build 1493)	4	4.88%
3.53 (build 2011)	4	4.88%
3.55 (build 1020)	4	4.88%
3.52 (build 1375)	3	3.66%
3.53 (build 2013)	2	2.44%
3.8-Build_1080	2	2.44%
3.81-Build_1055	1	1.22%
3.51 (build 1321)	1	1.22%
3.5 (build 1294)	1	1.22%
3.6-Build_1246	1	1.22%
3.8-Build_3045	1	1.22%
Other	0	0.00%
Mercury (64 servers)
Version	Number of Servers	Percent
1.48	34	53.12%
3.32	17	26.56%
3.21c	4	6.25%
3.01a	2	3.12%
1.47	2	3.12%
3.30	2	3.12%
3.21	1	1.56%
3.31	1	1.56%
1.49	1	1.56%
Other	0	0.00%
Neon Mail Server (52 servers)
Version	Number of Servers	Percent
3.1.3	13	25.00%
3.0.7	11	21.15%
3.0.9	6	11.54%
3.1.0	5	9.62%
3.1.4	5	9.62%
3.1.2	4	7.69%
3.1.1	3	5.77%
3.0.6	2	3.85%
3.1.5	2	3.85%
3.0.8	1	1.92%
Other	0	0.00%
WebSTAR V (46 servers)
Version	Number of Servers	Percent
5.4.1	20	43.48%
5.4.0	10	21.74%
5.3.4	7	15.22%
5.3.3	5	10.87%
5.3.2	2	4.35%
5.3.0	1	2.17%
5.3.1	1	2.17%
Other	0	0.00%
MessageWall (22 servers)
Version	Number of Servers	Percent
1.0.8	21	95.45%
1.0.6	1	4.55%
Other	0	0.00%
OpenVMS (21 servers)
Version	Number of Servers	Percent
8.3	8	38.10%
7.3	7	33.33%
8.4	4	19.05%
6.1	1	4.76%
8.2	1	4.76%
Other	0	0.00%
WebSTAR (19 servers)
Version	Number of Servers	Percent
Other	19	100.00%
ModusMail (18 servers)
Version	Number of Servers	Percent
4.35.477.0	8	44.44%
4.35.480.0	3	16.67%
4.1.361.21	1	5.56%
4.2.425.22	1	5.56%
3.2.315.0	1	5.56%
4.0.340.3	1	5.56%
4.3.459.0	1	5.56%
4.35.477.8	1	5.56%
3.1.302.0	1	5.56%
Other	0	0.00%
OpenSMTPD (14 servers)
Version	Number of Servers	Percent
Other	14	100.00%
MAILsweeper (9 servers)
Version	Number of Servers	Percent
4.3.17.0	3	33.33%
4.3.20.0	2	22.22%
4.3.19.0	1	11.11%
4.3.1.0	1	11.11%
4.3.14.0	1	11.11%
4.3.6.0	1	11.11%
Other	0	0.00%