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	2,321,080	100.0%
Number of Servers that didn't respond	379,408	16.35%
Server didn't open socket	367,015	15.81%
Server didn't provide banner	12,393	0.53%
Server provided banner	1,941,672	83.65%
Server banner identifies software in use	1,059,533	45.65%

As indicated by the above table, of the 2,321,080 servers queried, only 1,059,533 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	448,937	42.37%
Postfix	246,807	23.29%
Microsoft	136,022	12.84%
Sendmail	134,974	12.74%
MailEnable	33,497	3.16%
MDaemon	21,997	2.08%
IMail	10,026	0.95%
Lotus Domino	5,057	0.48%
WinWebMail	4,279	0.40%
CommuniGate Pro	3,504	0.33%
XMail	2,469	0.23%
Kerio	2,360	0.22%
Merak	1,816	0.17%
Qmail Toaster	1,733	0.16%
SurgeSMTP	1,267	0.12%
ArGoSoft	1,069	0.10%
GroupWise	861	0.08%
Trend Micro	527	0.05%
Post.Office	455	0.04%
Gordano Messaging Suite (GMS)	453	0.04%
MagicMail	361	0.03%
Mirapoint	245	0.02%
VisNetic	218	0.02%
InterScan VirusWall	184	0.02%
Interscan	80	0.01%
NetIQ MailMarshal	74	0.01%
Mercury	64	0.01%
Neon Mail Server	48	0.00%
WebSTAR V	43	0.00%
MessageWall	23	0.00%
OpenVMS	22	0.00%
WebSTAR	20	0.00%
ModusMail	18	0.00%
OpenSMTPD	13	0.00%
MAILsweeper	10	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (448,937 servers)
Version	Number of Servers	Percent
4.69	355,853	79.27%
4.76	39,805	8.87%
4.72	20,919	4.66%
4.67	9,291	2.07%
4.63	5,991	1.33%
4.71	4,504	1.00%
Other	12,574	2.80%
Postfix (246,807 servers)
Version	Number of Servers	Percent
Other	246,807	100.00%
Microsoft (136,022 servers)
Version	Number of Servers	Percent
6.0.3790.4675	104,643	76.93%
6.0.3790.3959	19,773	14.54%
6.0.3790.1830	5,502	4.04%
5.0.2195.7381	1,703	1.25%
Other	4,401	3.24%
Sendmail (134,974 servers)
Version	Number of Servers	Percent
8.13.8	32,198	23.85%
8.13.1	23,375	17.32%
8.14.4	18,941	14.03%
8.14.3	18,042	13.37%
8.12.11.20060308	6,249	4.63%
8.13.6.20060614	4,670	3.46%
8.14.2	3,786	2.80%
8.11.6	3,315	2.46%
8.12.10	3,158	2.34%
8.13.6	2,778	2.06%
8.14.1	2,682	1.99%
8.12.11.20060614	2,309	1.71%
8.13.7	2,006	1.49%
8.12.11	1,841	1.36%
8.14.5	1,644	1.22%
8.12.8	1,595	1.18%
8.13.4	1,563	1.16%
Other	4,822	3.57%
MailEnable (33,497 servers)
Version	Number of Servers	Percent
1.986--	9,928	29.64%
4.26--	2,694	8.04%
1.981--	2,017	6.02%
1.983--	1,278	3.82%
5.10--	1,274	3.80%
0-3.63-	868	2.59%
3.62--	865	2.58%
5.11--	756	2.26%
5.51--	650	1.94%
4.22--	537	1.60%
0-5.51-	532	1.59%
0-4.26-	529	1.58%
4.23--	474	1.42%
0-1.87-	426	1.27%
0-2.53-	384	1.15%
--3.63	369	1.10%
1.95--	365	1.09%
1.96--	354	1.06%
4.14--	350	1.04%
5.51--5.51	340	1.02%
Other	8,507	25.40%
MDaemon (21,997 servers)
Version	Number of Servers	Percent
11.0.3	3,094	14.07%
12.0.4	2,945	13.39%
12.0.3	1,951	8.87%
11.0.0	1,253	5.70%
10.1.2	1,061	4.82%
10.0.0	1,032	4.69%
10.1.1	821	3.73%
9.6.1	615	2.80%
9.6.6	589	2.68%
10.1.0	512	2.33%
12.0.1	497	2.26%
9.5.2	397	1.80%
9.6.5	392	1.78%
12.0.0	382	1.74%
10.0.5	379	1.72%
9.6.2	355	1.61%
10.0.2	355	1.61%
9.5.1	336	1.53%
9.5.6	319	1.45%
9.6.4	305	1.39%
8.1.3	294	1.34%
12.0.2	290	1.32%
10.0.4	280	1.27%
9.0.4	272	1.24%
11.0.2	244	1.11%
Other	3,027	13.76%
IMail (10,026 servers)
Version	Number of Servers	Percent
8.22	1,909	19.04%
11.5	1,345	13.42%
8.15	692	6.90%
11.03	627	6.25%
9.23	571	5.70%
11.01	494	4.93%
8.05	417	4.16%
11.02	403	4.02%
9.10	395	3.94%
9.20	362	3.61%
10.02	307	3.06%
11.0	301	3.00%
7.07	256	2.55%
7.15	229	2.28%
8.00	189	1.89%
6.06	181	1.81%
10.01	149	1.49%
9.21	125	1.25%
8.04	118	1.18%
Other	956	9.54%
Lotus Domino (5,057 servers)
Version	Number of Servers	Percent
8.5.2	580	11.47%
8.5.2FP2	488	9.65%
8.5.1	349	6.90%
8.5.2FP3	274	5.42%
7.0.2	270	5.34%
8.5.2FP1	245	4.84%
8.5	235	4.65%
7.0.3	159	3.14%
8.0.1	130	2.57%
8.0.2	130	2.57%
7.0.1	127	2.51%
8.5.1FP5	123	2.43%
6.5.4	110	2.18%
6.5.1	108	2.14%
8.5.1FP3	96	1.90%
6.5.3	93	1.84%
8.0	88	1.74%
7.0	83	1.64%
7.0.2FP2	75	1.48%
6.5.5	75	1.48%
8.5.3	73	1.44%
6.5	67	1.32%
8.5.1FP4	67	1.32%
7.0.3FP1	67	1.32%
8.5.1FP2	63	1.25%
Other	882	17.44%
WinWebMail (4,279 servers)
Version	Number of Servers	Percent
3.8.1.3	1,036	24.21%
3.8.0.1	761	17.78%
3.7.6.1	588	13.74%
3.8.1.1	382	8.93%
3.7.7.3	380	8.88%
3.7.3.1	374	8.74%
3.7.1.1	187	4.37%
3.7.5.1	136	3.18%
3.7.7.1	112	2.62%
3.6.3.1	91	2.13%
3.7.0.5	73	1.71%
3.7.0.3	71	1.66%
3.7.0.7	59	1.38%
Other	29	0.68%
CommuniGate Pro (3,504 servers)
Version	Number of Servers	Percent
5.1.16	272	7.76%
5.4.1	250	7.13%
4.1.8	180	5.14%
5.3.13	153	4.37%
5.2.20	129	3.68%
5.3.8	100	2.85%
5.2.16	98	2.80%
5.4.0	96	2.74%
4.2.10	93	2.65%
5.2.19	79	2.25%
5.3.12	74	2.11%
5.2.3	73	2.08%
5.1.12	71	2.03%
5.0.14	70	2.00%
5.3.10	66	1.88%
5.3.14	65	1.86%
5.2.14	64	1.83%
5.3.9	61	1.74%
5.4	61	1.74%
5.2.12	57	1.63%
5.1.13	52	1.48%
5.3.11	51	1.46%
5.2.8	50	1.43%
5.2.13	42	1.20%
5.3.7	40	1.14%
5.2.0	37	1.06%
5.3.2	37	1.06%
5.2.10	36	1.03%
Other	1,047	29.88%
XMail (2,469 servers)
Version	Number of Servers	Percent
1.22	598	24.22%
1.25	490	19.85%
1.27	417	16.89%
1.26	320	12.96%
1.24	249	10.09%
1.21	106	4.29%
1.23	63	2.55%
1.20	53	2.15%
1.17	41	1.66%
1.12	34	1.38%
Other	98	3.97%
Kerio (2,360 servers)
Version	Number of Servers	Percent
6.7.3	327	13.86%
6.6.2	250	10.59%
6.7.0	219	9.28%
6.7.2	160	6.78%
6.5.0	159	6.74%
6.5.2	153	6.48%
6.4.1	131	5.55%
6.7.1	129	5.47%
6.3.1	121	5.13%
6.4.0	92	3.90%
6.6.0	89	3.77%
6.5.1	76	3.22%
6.6.1	69	2.92%
6.4.2	53	2.25%
6.3.0	39	1.65%
6.2.0	28	1.19%
6.1.3	25	1.06%
6.2.2	25	1.06%
6.1.0	25	1.06%
Other	190	8.05%
Merak (1,816 servers)
Version	Number of Servers	Percent
8.0.3	728	40.09%
8.9.1	178	9.80%
8.5.0	135	7.43%
7.5.2	82	4.52%
7.6.4	73	4.02%
8.3.8	69	3.80%
7.4.5	65	3.58%
8.2.13	48	2.64%
9.0.0	32	1.76%
7.4.2	29	1.60%
7.2.0	24	1.32%
8.2.4	24	1.32%
7.6.1	23	1.27%
8.3.15	23	1.27%
7.0.1	22	1.21%
8.9.0	19	1.05%
Other	242	13.33%
Qmail Toaster (1,733 servers)
Version	Number of Servers	Percent
1.3	1,623	93.65%
1.2	76	4.39%
1.0	20	1.15%
Other	14	0.81%
SurgeSMTP (1,267 servers)
Version	Number of Servers	Percent
5.3h2-2	264	20.84%
5.2a-1	205	16.18%
3.9e-1	96	7.58%
4.2d4-4	88	6.95%
4.0u4-4	53	4.18%
5.0e4-4	51	4.03%
5.3h-1	46	3.63%
3.8k4-4	43	3.39%
4.2d2-2	28	2.21%
3.8i3-3	25	1.97%
4.3g2-2	23	1.82%
5.0e3-3	19	1.50%
3.7b8-8	18	1.42%
5.1c2-2	17	1.34%
4.3g4-4	16	1.26%
3.9c-1	16	1.26%
3.6f5-5	16	1.26%
3.9h-18	15	1.18%
4.2a3-3	15	1.18%
4.3e-1	14	1.10%
5.1c-1	13	1.03%
Other	186	14.68%
ArGoSoft (1,069 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	241	22.54%
1.8 (1.8.9.5)	169	15.81%
1.8 (1.8.9.3)	136	12.72%
1.8 (1.8.9.1)	101	9.45%
1.8 (1.8.8.8)	82	7.67%
1.8 (1.8.8.7)	63	5.89%
1.8 (1.8.9.2)	43	4.02%
1.8 (1.8.9.4)	29	2.71%
1.8 (1.8.8.9)	17	1.59%
1.8 (1.8.8.1)	17	1.59%
1.8 (1.8.6.0)	16	1.50%
1.8 (1.8.9.0)	13	1.22%
Other	142	13.28%
GroupWise (861 servers)
Version	Number of Servers	Percent
7.0.3	198	23.00%
8.0.2	172	19.98%
6.5.7	91	10.57%
7.0.2	66	7.67%
8.0.1	57	6.62%
7.0.4	54	6.27%
6.5.4	36	4.18%
7.0.1	34	3.95%
6.0.4	27	3.14%
6.5.6	25	2.90%
6.5.1	21	2.44%
8.0.0	18	2.09%
6.5.5	16	1.86%
7.0	12	1.39%
Other	34	3.95%
Trend Micro (527 servers)
Version	Number of Servers	Percent
5.7	220	41.75%
5.5	133	25.24%
5.18	95	18.03%
7.0	49	9.30%
7.1	16	3.04%
Other	14	2.66%
Post.Office (455 servers)
Version	Number of Servers	Percent
3.5.3	74	16.26%
4.1.0.2	50	10.99%
4.0.1	39	8.57%
4.1.2.4	30	6.59%
4.1.1	22	4.84%
3.5.3J	20	4.40%
3.9.2.3	18	3.96%
3.8.3	16	3.52%
3.9.2	13	2.86%
3.1.2J	11	2.42%
3.1.2	10	2.20%
4.1.0.3	10	2.20%
3.6.2	10	2.20%
4.0.1.1	8	1.76%
3.9.1	8	1.76%
4.1.0.4	8	1.76%
3.8.7.4	8	1.76%
4.1.2.2	7	1.54%
4.1.2.3	7	1.54%
3.9.2.1	7	1.54%
4.2	7	1.54%
4.0.0.2	7	1.54%
4.1	6	1.32%
4.0.0.1	6	1.32%
3.9.1.2	5	1.10%
3.9.1.3	5	1.10%
3.5.1	5	1.10%
Other	38	8.35%
Gordano Messaging Suite (GMS) (453 servers)
Version	Number of Servers	Percent
Other	453	100.00%
MagicMail (361 servers)
Version	Number of Servers	Percent
Other	361	100.00%
Mirapoint (245 servers)
Version	Number of Servers	Percent
4.2.3-GA	28	11.43%
3.10.10a-GA	24	9.80%
3.8.4-GA	22	8.98%
3.10.5-GA	19	7.76%
3.8.3-GA	18	7.35%
3.10.8-GA	14	5.71%
4.1.10-GA	14	5.71%
4.1.3-GA	12	4.90%
3.10.9-GA	12	4.90%
4.1.9-GA	10	4.08%
3.10.7-GA	9	3.67%
3.10.3-GA	7	2.86%
3.8.2-GA	6	2.45%
4.1.4-GA	6	2.45%
3.8.7a	6	2.45%
4.1.8-GA	5	2.04%
3.8.5-GA	4	1.63%
3.10.4-GA	4	1.63%
3.10.6-GA	3	1.22%
3.7.5a-GA	3	1.22%
3.8.6-GA	3	1.22%
4.1.5-GA	3	1.22%
Other	13	5.31%
VisNetic (218 servers)
Version	Number of Servers	Percent
9.3.2.0	75	34.40%
9.1.4.1	31	14.22%
5.8.6.6	15	6.88%
8.5.0.8	11	5.05%
8.0.3.1	7	3.21%
5.5.8.3	7	3.21%
8.0.3	6	2.75%
7.6.1.0	6	2.75%
8.3.5.0	5	2.29%
6.2.2.0	5	2.29%
8.0.3.0	5	2.29%
5.3.5.0	5	2.29%
5.0.2.3	5	2.29%
5.0.2.1	4	1.83%
7.2.4.1	4	1.83%
9.1.4.0	4	1.83%
5.4.5.4	3	1.38%
Other	20	9.17%
InterScan VirusWall (184 servers)
Version	Number of Servers	Percent
Other	184	100.00%
Interscan (80 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	16	20.00%
3.81-Build_1022	10	12.50%
3.55 (build 1029)	9	11.25%
3.53 (build 2017)	8	10.00%
3.8-Build_3013	7	8.75%
3.81-Build_1084	6	7.50%
3.53 (build 2011)	4	5.00%
3.55 (build 1020)	4	5.00%
3.53 (build 1493)	3	3.75%
3.52 (build 1375)	3	3.75%
3.53 (build 2013)	2	2.50%
3.8-Build_1080	2	2.50%
3.81-Build_1055	1	1.25%
3.51 (build 1321)	1	1.25%
3.5 (build 1294)	1	1.25%
3.51 (build 1337)	1	1.25%
3.6-Build_1246	1	1.25%
3.8-Build_3045	1	1.25%
Other	0	0.00%
NetIQ MailMarshal (74 servers)
Version	Number of Servers	Percent
6.0.3.8	50	67.57%
5.5.6.7	7	9.46%
6.1.3.15	6	8.11%
5.5.6.6	3	4.05%
5.5.6.5	2	2.70%
5.5.4.16	2	2.70%
5.5.5.9	1	1.35%
5.5.4.17	1	1.35%
5.5.3.17	1	1.35%
5.5.5.6	1	1.35%
Other	0	0.00%
Mercury (64 servers)
Version	Number of Servers	Percent
1.48	32	50.00%
3.32	17	26.56%
1.47	3	4.69%
3.21c	3	4.69%
3.21	2	3.12%
3.01a	2	3.12%
1.44	1	1.56%
3.31	1	1.56%
4.x	1	1.56%
1.49	1	1.56%
3.30	1	1.56%
Other	0	0.00%
Neon Mail Server (48 servers)
Version	Number of Servers	Percent
3.1.3	11	22.92%
3.0.7	10	20.83%
3.0.9	6	12.50%
3.1.4	5	10.42%
3.1.2	5	10.42%
3.1.0	4	8.33%
3.0.6	2	4.17%
3.1.1	2	4.17%
3.1.5	2	4.17%
3.0.8	1	2.08%
Other	0	0.00%
WebSTAR V (43 servers)
Version	Number of Servers	Percent
5.4.1	19	44.19%
5.4.0	9	20.93%
5.3.4	6	13.95%
5.3.3	5	11.63%
5.3.2	2	4.65%
5.3.0	1	2.33%
5.3.1	1	2.33%
Other	0	0.00%
MessageWall (23 servers)
Version	Number of Servers	Percent
1.0.8	22	95.65%
1.0.6	1	4.35%
Other	0	0.00%
OpenVMS (22 servers)
Version	Number of Servers	Percent
8.3	9	40.91%
7.3	7	31.82%
8.4	4	18.18%
6.1	1	4.55%
8.2	1	4.55%
Other	0	0.00%
WebSTAR (20 servers)
Version	Number of Servers	Percent
Other	20	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 (13 servers)
Version	Number of Servers	Percent
Other	13	100.00%
MAILsweeper (10 servers)
Version	Number of Servers	Percent
4.3.17.0	3	30.00%
4.3.20.0	2	20.00%
4.3.19.0	2	20.00%
4.3.1.0	1	10.00%
4.3.14.0	1	10.00%
4.3.6.0	1	10.00%
Other	0	0.00%