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	2,217,321	100.0%
Number of Servers that didn't respond	374,360	16.88%
Server didn't open socket	362,144	16.33%
Server didn't provide banner	12,216	0.55%
Server provided banner	1,842,961	83.12%
Server banner identifies software in use	1,001,522	45.17%

As indicated by the above table, of the 2,217,321 servers queried, only 1,001,522 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	384,072	38.35%
Postfix	224,000	22.37%
Microsoft	154,449	15.42%
Sendmail	143,165	14.29%
MailEnable	31,925	3.19%
MDaemon	22,311	2.23%
IMail	11,366	1.13%
Lotus Domino	5,181	0.52%
WinWebMail	4,633	0.46%
CommuniGate Pro	3,647	0.36%
Kerio	3,145	0.31%
XMail	2,559	0.26%
Merak	2,150	0.21%
Qmail Toaster	1,758	0.18%
SurgeSMTP	1,305	0.13%
ArGoSoft	1,274	0.13%
GroupWise	1,103	0.11%
Trend Micro	690	0.07%
Post.Office	517	0.05%
Gordano Messaging Suite (GMS)	502	0.05%
MagicMail	445	0.04%
Mirapoint	301	0.03%
VisNetic	254	0.03%
InterScan VirusWall	236	0.02%
NetIQ MailMarshal	116	0.01%
Interscan	101	0.01%
Mercury	84	0.01%
WebSTAR V	60	0.01%
Neon Mail Server	55	0.01%
MessageWall	27	0.00%
WebSTAR	26	0.00%
OpenVMS	23	0.00%
ModusMail	23	0.00%
MAILsweeper	11	0.00%
OpenSMTPD	8	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (384,072 servers)
Version	Number of Servers	Percent
4.69	324,313	84.44%
4.72	17,009	4.43%
4.67	12,592	3.28%
4.63	10,012	2.61%
4.71	4,768	1.24%
Other	15,378	4.00%
Postfix (224,000 servers)
Version	Number of Servers	Percent
Other	224,000	100.00%
Microsoft (154,449 servers)
Version	Number of Servers	Percent
6.0.3790.4675	110,188	71.34%
6.0.3790.3959	29,482	19.09%
6.0.3790.1830	7,667	4.96%
5.0.2195.7381	2,228	1.44%
5.0.2195.6713	1,596	1.03%
Other	3,288	2.13%
Sendmail (143,165 servers)
Version	Number of Servers	Percent
8.13.8	30,014	20.96%
8.13.1	26,897	18.79%
8.14.4	17,210	12.02%
8.14.3	16,141	11.27%
8.12.11.20060308	7,401	5.17%
8.12.11.20060614	6,519	4.55%
8.13.6.20060614	5,381	3.76%
8.14.2	4,398	3.07%
8.12.10	4,068	2.84%
8.11.6	4,023	2.81%
8.13.6	3,362	2.35%
8.14.1	3,234	2.26%
8.12.11	2,377	1.66%
8.13.7	2,274	1.59%
8.13.4	2,208	1.54%
8.12.8	1,958	1.37%
Other	5,700	3.98%
MailEnable (31,925 servers)
Version	Number of Servers	Percent
1.986--	10,659	33.39%
1.981--	2,573	8.06%
1.983--	1,628	5.10%
4.26--	1,300	4.07%
3.62--	1,112	3.48%
0-3.63-	935	2.93%
4.23--	767	2.40%
4.22--	703	2.20%
0-4.26-	625	1.96%
1.96--	480	1.50%
1.95--	445	1.39%
0-2.53-	440	1.38%
0-1.87-	408	1.28%
--3.63	392	1.23%
4.14--	375	1.17%
1.9--	342	1.07%
0-4.23-	337	1.06%
Other	8,404	26.32%
MDaemon (22,311 servers)
Version	Number of Servers	Percent
11.0.3	6,902	30.94%
10.1.2	1,402	6.28%
10.0.0	1,180	5.29%
11.0.0	1,115	5.00%
10.1.1	960	4.30%
9.6.1	735	3.29%
9.6.6	715	3.20%
10.1.0	580	2.60%
9.6.5	492	2.21%
10.0.5	490	2.20%
9.5.2	478	2.14%
10.0.2	437	1.96%
11.0.2	402	1.80%
10.0.4	382	1.71%
9.5.1	381	1.71%
9.6.2	373	1.67%
9.5.6	373	1.67%
9.6.4	369	1.65%
8.1.3	356	1.60%
9.0.4	326	1.46%
11.0.1	299	1.34%
9.6.3	237	1.06%
6.8.5	226	1.01%
Other	3,101	13.90%
IMail (11,366 servers)
Version	Number of Servers	Percent
8.22	2,204	19.39%
11.02	1,071	9.42%
8.15	875	7.70%
9.23	774	6.81%
11.03	733	6.45%
11.01	623	5.48%
8.05	505	4.44%
9.20	482	4.24%
9.10	478	4.21%
11.0	413	3.63%
10.02	392	3.45%
7.07	315	2.77%
9.21	309	2.72%
7.15	271	2.38%
8.00	234	2.06%
6.06	228	2.01%
10.01	164	1.44%
8.04	163	1.43%
8.10	115	1.01%
Other	1,017	8.95%
Lotus Domino (5,181 servers)
Version	Number of Servers	Percent
8.5.2	600	11.58%
8.5.1	461	8.90%
8.5	329	6.35%
7.0.2	316	6.10%
8.5.2FP1	288	5.56%
7.0.3	191	3.69%
8.0.2	168	3.24%
7.0.1	165	3.18%
8.0.1	163	3.15%
8.5.1FP3	160	3.09%
6.5.1	143	2.76%
6.5.4	140	2.70%
6.5.3	122	2.35%
8.5.1FP2	116	2.24%
8.0	109	2.10%
7.0	105	2.03%
7.0.3FP1	100	1.93%
8.5.1FP4	99	1.91%
7.0.2FP2	93	1.80%
6.5.5	91	1.76%
8.5.1FP5	82	1.58%
6.5	76	1.47%
8.5.1FP1	69	1.33%
8.5FP1	63	1.22%
5.0.11	55	1.06%
Other	877	16.93%
WinWebMail (4,633 servers)
Version	Number of Servers	Percent
3.8.0.1	1,018	21.97%
3.7.6.1	704	15.20%
3.7.7.3	532	11.48%
3.7.3.1	514	11.09%
3.8.1.3	510	11.01%
3.8.1.1	422	9.11%
3.7.1.1	228	4.92%
3.7.5.1	154	3.32%
3.7.7.1	128	2.76%
3.6.3.1	120	2.59%
3.7.0.5	108	2.33%
3.7.0.3	96	2.07%
3.7.0.7	71	1.53%
Other	28	0.60%
CommuniGate Pro (3,647 servers)
Version	Number of Servers	Percent
5.1.16	259	7.10%
4.1.8	201	5.51%
5.2.16	145	3.98%
5.3.8	140	3.84%
5.3.10	136	3.73%
5.3.12	126	3.45%
5.3.11	125	3.43%
4.2.10	114	3.13%
5.2.20	104	2.85%
5.2.19	95	2.60%
5.3.9	87	2.39%
5.1.12	85	2.33%
5.0.14	78	2.14%
5.2.3	74	2.03%
5.2.12	72	1.97%
5.2.14	71	1.95%
5.1.13	65	1.78%
5.3.7	62	1.70%
5.2.8	58	1.59%
5.3.5	58	1.59%
5.2.13	56	1.54%
5.4	55	1.51%
5.2.10	50	1.37%
5.3.2	50	1.37%
5.2.18	46	1.26%
5.2.0	41	1.12%
5.1.14	41	1.12%
5.0.9	39	1.07%
5.2.11	38	1.04%
Other	1,076	29.50%
Kerio (3,145 servers)
Version	Number of Servers	Percent
6.7.3	425	13.51%
6.6.2	355	11.29%
6.7.0	313	9.95%
6.7.2	247	7.85%
6.5.0	219	6.96%
6.5.2	179	5.69%
6.3.1	167	5.31%
6.7.1	163	5.18%
6.4.1	152	4.83%
6.6.0	119	3.78%
6.4.0	112	3.56%
6.5.1	104	3.31%
6.4.2	79	2.51%
6.6.1	78	2.48%
6.3.0	66	2.10%
6.1.3	36	1.14%
6.2.2	32	1.02%
Other	299	9.51%
XMail (2,559 servers)
Version	Number of Servers	Percent
1.22	601	23.49%
1.25	590	23.06%
1.26	320	12.50%
1.27	301	11.76%
1.24	288	11.25%
1.21	116	4.53%
1.23	72	2.81%
1.20	61	2.38%
1.12	51	1.99%
1.17	49	1.91%
Other	110	4.30%
Merak (2,150 servers)
Version	Number of Servers	Percent
8.0.3	873	40.60%
8.9.1	209	9.72%
8.5.0	145	6.74%
7.4.5	100	4.65%
7.5.2	94	4.37%
7.6.4	89	4.14%
8.3.8	83	3.86%
8.2.13	46	2.14%
9.0.0	31	1.44%
7.4.2	31	1.44%
7.6.1	30	1.40%
7.2.0	27	1.26%
8.3.15	27	1.26%
8.2.4	26	1.21%
8.9.0	26	1.21%
7.0.1	23	1.07%
Other	290	13.49%
Qmail Toaster (1,758 servers)
Version	Number of Servers	Percent
1.3	1,627	92.55%
1.2	97	5.52%
1.0	24	1.37%
Other	10	0.57%
SurgeSMTP (1,305 servers)
Version	Number of Servers	Percent
5.2a-1	271	20.77%
3.9e-1	119	9.12%
4.2d4-4	110	8.43%
5.0e4-4	89	6.82%
3.8k4-4	55	4.21%
4.0u4-4	50	3.83%
5.1c2-2	42	3.22%
4.2d2-2	36	2.76%
5.0e3-3	34	2.61%
4.3e-1	33	2.53%
4.3g2-2	32	2.45%
4.3g4-4	28	2.15%
3.8i3-3	28	2.15%
5.1c-1	28	2.15%
3.7b8-8	24	1.84%
3.8f3-3	23	1.76%
4.2a3-3	22	1.69%
3.6f5-5	21	1.61%
5.2c-1	20	1.53%
3.9g2-2	15	1.15%
3.9h-18	15	1.15%
3.9c-1	15	1.15%
Other	195	14.94%
ArGoSoft (1,274 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	257	20.17%
1.8 (1.8.9.5)	208	16.33%
1.8 (1.8.9.3)	159	12.48%
1.8 (1.8.9.1)	122	9.58%
1.8 (1.8.8.8)	105	8.24%
1.8 (1.8.8.7)	80	6.28%
1.8 (1.8.9.2)	54	4.24%
1.8 (1.8.9.4)	37	2.90%
1.8 (1.8.8.1)	24	1.88%
1.8 (1.8.8.9)	22	1.73%
1.8 (1.8.6.0)	18	1.41%
1.8 (1.8.9.0)	16	1.26%
1.8 (1.8.8.2)	13	1.02%
Other	159	12.48%
GroupWise (1,103 servers)
Version	Number of Servers	Percent
7.0.3	278	25.20%
8.0.2	158	14.32%
6.5.7	121	10.97%
7.0.2	107	9.70%
8.0.1	83	7.52%
6.5.4	53	4.81%
7.0.1	50	4.53%
7.0.4	43	3.90%
6.5.6	42	3.81%
6.5.1	34	3.08%
6.0.4	29	2.63%
8.0.0	28	2.54%
6.5.5	18	1.63%
7.0	14	1.27%
Other	45	4.08%
Trend Micro (690 servers)
Version	Number of Servers	Percent
5.7	286	41.45%
5.5	185	26.81%
5.18	123	17.83%
7.0	61	8.84%
7.1	15	2.17%
7	8	1.16%
Other	12	1.74%
Post.Office (517 servers)
Version	Number of Servers	Percent
3.5.3	80	15.47%
4.1.0.2	61	11.80%
4.0.1	44	8.51%
3.5.3J	26	5.03%
4.1.1	23	4.45%
3.8.3	22	4.26%
4.1.2.4	18	3.48%
3.9.2.3	16	3.09%
3.9.2	14	2.71%
3.1.2J	13	2.51%
3.9.1	12	2.32%
3.1.2	11	2.13%
4.1.0.3	11	2.13%
4.1.0.4	11	2.13%
4.1.2.2	11	2.13%
4.0.1.1	10	1.93%
4.1	10	1.93%
3.8.7.4	10	1.93%
3.6.2	10	1.93%
4.0.0.2	9	1.74%
3.6.3	9	1.74%
3.9.2.1	8	1.55%
4.0.0.1	7	1.35%
3.9.0	6	1.16%
3.9.1.2	6	1.16%
3.9.1.3	6	1.16%
3.5.2	6	1.16%
Other	47	9.09%
Gordano Messaging Suite (GMS) (502 servers)
Version	Number of Servers	Percent
Other	502	100.00%
MagicMail (445 servers)
Version	Number of Servers	Percent
Other	445	100.00%
Mirapoint (301 servers)
Version	Number of Servers	Percent
3.8.4-GA	28	9.30%
3.10.5-GA	27	8.97%
3.10.8-GA	24	7.97%
3.8.3-GA	21	6.98%
3.10.10a-GA	19	6.31%
3.10.9-GA	17	5.65%
4.1.3-GA	16	5.32%
3.10.7-GA	16	5.32%
4.1.9-GA	16	5.32%
4.1.10-GA	14	4.65%
3.10.4-GA	11	3.65%
4.1.8-GA	10	3.32%
3.10.6-GA	9	2.99%
3.10.3-GA	8	2.66%
3.8.5-GA	7	2.33%
4.1.4-GA	7	2.33%
3.8.2-GA	6	1.99%
4.2.3-GA	6	1.99%
3.8.7a	6	1.99%
3.8.6-GA	5	1.66%
4.0.5a	4	1.33%
3.7.3a-GA	4	1.33%
Other	20	6.64%
VisNetic (254 servers)
Version	Number of Servers	Percent
9.3.2.0	90	35.43%
9.1.4.1	37	14.57%
5.8.6.6	14	5.51%
8.5.0.8	14	5.51%
8.0.3.1	9	3.54%
5.5.8.3	9	3.54%
8.0.3	7	2.76%
7.6.1.0	7	2.76%
8.3.5.0	6	2.36%
6.2.2.0	6	2.36%
8.0.3.0	6	2.36%
5.3.5.0	5	1.97%
7.2.4.1	5	1.97%
8.3.6	4	1.57%
5.0.2.1	4	1.57%
9.1.4.0	4	1.57%
5.0.2.3	4	1.57%
7.5.3.0	3	1.18%
7.2.4.0	3	1.18%
5.4.5.4	3	1.18%
Other	14	5.51%
InterScan VirusWall (236 servers)
Version	Number of Servers	Percent
Other	236	100.00%
NetIQ MailMarshal (116 servers)
Version	Number of Servers	Percent
6.0.3.8	81	69.83%
5.5.6.7	9	7.76%
6.1.3.15	8	6.90%
5.5.6.6	4	3.45%
5.5.4.16	4	3.45%
5.5.3.17	2	1.72%
5.5.6.5	2	1.72%
Other	6	5.17%
Interscan (101 servers)
Version	Number of Servers	Percent
3.81-Build_1022	17	16.83%
3.55 (build 1016)	15	14.85%
3.55 (build 1029)	12	11.88%
3.53 (build 2017)	10	9.90%
3.8-Build_3013	7	6.93%
3.81-Build_1084	7	6.93%
3.55 (build 1020)	5	4.95%
3.53 (build 1493)	4	3.96%
3.53 (build 2011)	4	3.96%
3.52 (build 1375)	4	3.96%
3.53 (build 1494)	2	1.98%
3.53 (build 2013)	2	1.98%
3.8-Build_1080	2	1.98%
Other	10	9.90%
Mercury (84 servers)
Version	Number of Servers	Percent
1.48	46	54.76%
3.32	23	27.38%
3.21c	5	5.95%
3.01a	2	2.38%
1.47	2	2.38%
3.30	2	2.38%
3.21	1	1.19%
1.44	1	1.19%
3.31	1	1.19%
1.49	1	1.19%
Other	0	0.00%
WebSTAR V (60 servers)
Version	Number of Servers	Percent
5.4.1	22	36.67%
5.4.0	13	21.67%
5.3.4	12	20.00%
5.3.3	6	10.00%
5.3.2	5	8.33%
5.3.0	1	1.67%
5.3.1	1	1.67%
Other	0	0.00%
Neon Mail Server (55 servers)
Version	Number of Servers	Percent
3.1.3	15	27.27%
3.0.7	12	21.82%
3.0.9	8	14.55%
3.1.4	6	10.91%
3.1.2	4	7.27%
3.1.0	4	7.27%
3.1.5	3	5.45%
3.0.8	1	1.82%
3.1.1	1	1.82%
3.0.6	1	1.82%
Other	0	0.00%
MessageWall (27 servers)
Version	Number of Servers	Percent
1.0.8	25	92.59%
1.0.6	1	3.70%
1.1.0	1	3.70%
Other	0	0.00%
WebSTAR (26 servers)
Version	Number of Servers	Percent
Other	26	100.00%
OpenVMS (23 servers)
Version	Number of Servers	Percent
8.3	11	47.83%
7.3	6	26.09%
8.4	2	8.70%
8.2	2	8.70%
6.1	1	4.35%
7.2	1	4.35%
Other	0	0.00%
ModusMail (23 servers)
Version	Number of Servers	Percent
4.35.477.0	7	30.43%
4.35.480.0	3	13.04%
4.1.361.21	2	8.70%
3.1.302.0	2	8.70%
4.35.480.11	2	8.70%
4.2.425.22	1	4.35%
4.2.420.0	1	4.35%
3.2.315.0	1	4.35%
4.0.340.3	1	4.35%
3.1.293.1	1	4.35%
4.3.459.0	1	4.35%
4.35.477.8	1	4.35%
Other	0	0.00%
MAILsweeper (11 servers)
Version	Number of Servers	Percent
4.3.17.0	4	36.36%
4.3.20.0	2	18.18%
4.3.14.0	2	18.18%
4.3.19.0	1	9.09%
4.3.1.0	1	9.09%
4.3.6.0	1	9.09%
Other	0	0.00%
OpenSMTPD (8 servers)
Version	Number of Servers	Percent
Other	8	100.00%