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	2,394,282	100.0%
Number of Servers that didn't respond	402,625	16.82%
Server didn't open socket	391,852	16.37%
Server didn't provide banner	10,773	0.45%
Server provided banner	1,991,657	83.18%
Server banner identifies software in use	1,090,569	45.55%

As indicated by the above table, of the 2,394,282 servers queried, only 1,090,569 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	512,245	46.97%
Postfix	273,562	25.08%
Sendmail	120,505	11.05%
Microsoft	99,988	9.17%
MailEnable	33,378	3.06%
MDaemon	20,946	1.92%
IMail	7,513	0.69%
Lotus Domino	4,638	0.43%
WinWebMail	3,325	0.30%
CommuniGate Pro	3,189	0.29%
XMail	2,167	0.20%
Qmail Toaster	1,677	0.15%
Kerio	1,673	0.15%
Merak	1,276	0.12%
SurgeSMTP	1,054	0.10%
ArGoSoft	770	0.07%
GroupWise	531	0.05%
Post.Office	378	0.03%
Trend Micro	364	0.03%
Gordano Messaging Suite (GMS)	354	0.03%
MagicMail	315	0.03%
Mirapoint	172	0.02%
InterScan VirusWall	135	0.01%
VisNetic	128	0.01%
Mercury	54	0.00%
Interscan	49	0.00%
NetIQ MailMarshal	38	0.00%
WebSTAR V	30	0.00%
Neon Mail Server	27	0.00%
OpenSMTPD	22	0.00%
OpenVMS	18	0.00%
MessageWall	18	0.00%
ModusMail	13	0.00%
WebSTAR	12	0.00%
MAILsweeper	5	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (512,245 servers)
Version	Number of Servers	Percent
4.80	266,552	52.04%
4.77	107,352	20.96%
4.76	49,979	9.76%
4.69	37,146	7.25%
4.72	24,708	4.82%
4.67	6,098	1.19%
Other	20,410	3.98%
Postfix (273,562 servers)
Version	Number of Servers	Percent
Other	273,562	100.00%
Sendmail (120,505 servers)
Version	Number of Servers	Percent
8.13.8	32,334	26.83%
8.13.1	18,232	15.13%
8.14.3	16,092	13.35%
8.14.5	12,971	10.76%
8.14.4	11,343	9.41%
8.12.11.20060308	4,731	3.93%
8.13.6.20060614	3,724	3.09%
8.14.2	3,413	2.83%
8.11.6	2,387	1.98%
8.12.10	2,094	1.74%
8.14.1	1,916	1.59%
8.13.6	1,763	1.46%
8.12.11.20060614	1,598	1.33%
8.13.7	1,447	1.20%
8.12.11	1,281	1.06%
Other	5,179	4.30%
Microsoft (99,988 servers)
Version	Number of Servers	Percent
6.0.3790.4675	80,385	80.39%
6.0.3790.3959	11,243	11.24%
6.0.3790.1830	3,020	3.02%
7.5.7601.17514	1,575	1.58%
5.0.2195.7381	1,082	1.08%
Other	2,683	2.68%
MailEnable (33,378 servers)
Version	Number of Servers	Percent
1.986--	7,310	21.90%
5.10--	2,647	7.93%
4.26--	2,323	6.96%
1.981--	1,308	3.92%
6.0--	1,298	3.89%
6.5--	1,152	3.45%
1.983--	806	2.41%
6.03--	707	2.12%
0-3.63-	696	2.09%
3.62--	618	1.85%
5.51--	616	1.85%
5.11--	548	1.64%
6.53--	513	1.54%
6.60--	411	1.23%
0-1.87-	369	1.11%
4.22--	337	1.01%
0-4.26-	334	1.00%
Other	11,385	34.11%
MDaemon (20,946 servers)
Version	Number of Servers	Percent
13.0.0	2,275	10.86%
11.0.3	2,274	10.86%
12.5.6	1,866	8.91%
11.0.0	1,310	6.25%
10.0.0	810	3.87%
10.1.2	742	3.54%
12.5.4	734	3.50%
10.1.1	690	3.29%
12.5.7	594	2.84%
13.0.1	582	2.78%
12.5.3	522	2.49%
9.6.1	510	2.43%
9.6.6	467	2.23%
12.0.3	462	2.21%
10.1.0	445	2.12%
12.0.4	321	1.53%
12.5.2	321	1.53%
9.6.2	310	1.48%
9.5.2	290	1.38%
9.6.5	280	1.34%
10.0.5	280	1.34%
10.0.2	254	1.21%
9.5.1	241	1.15%
9.6.4	236	1.13%
9.5.6	233	1.11%
Other	3,897	18.60%
IMail (7,513 servers)
Version	Number of Servers	Percent
8.22	1,372	18.26%
11.5	902	12.01%
12.1.0.270	690	9.18%
9.23	467	6.22%
8.15	453	6.03%
11.03	397	5.28%
11.01	365	4.86%
8.05	288	3.83%
10.02	216	2.88%
12.0.0.384	211	2.81%
12.2.0.169	179	2.38%
7.07	165	2.20%
11.0	154	2.05%
11.02	154	2.05%
8.00	139	1.85%
6.06	131	1.74%
7.15	126	1.68%
10.01	125	1.66%
12.0.0.348	112	1.49%
9.21	85	1.13%
9.10	79	1.05%
Other	703	9.36%
Lotus Domino (4,638 servers)
Version	Number of Servers	Percent
8.5.3	822	17.72%
8.5.2	336	7.24%
8.5.2FP2	256	5.52%
8.5.3FP1	251	5.41%
8.5.3FP2	236	5.09%
8.5.1	227	4.89%
7.0.2	197	4.25%
8.5	157	3.39%
8.5.2FP3	141	3.04%
7.0.3	112	2.41%
8.5.2FP4	106	2.29%
8.5.2FP1	104	2.24%
8.5.1FP5	99	2.13%
7.0.1	90	1.94%
8.0.1	87	1.88%
8.0.2	84	1.81%
6.5.4	83	1.79%
6.5.3	82	1.77%
6.5.1	76	1.64%
7.0	68	1.47%
8.0	64	1.38%
6.5.5	52	1.12%
8.5.1FP3	49	1.06%
8.5.1FP4	49	1.06%
6.5	47	1.01%
Other	763	16.45%
WinWebMail (3,325 servers)
Version	Number of Servers	Percent
3.8.1.3	674	20.27%
3.8.0.1	446	13.41%
3.7.6.1	361	10.86%
3.8.1.5	327	9.83%
3.8.2.1	317	9.53%
3.7.3.1	259	7.79%
3.8.1.1	245	7.37%
3.7.7.3	227	6.83%
3.7.1.1	122	3.67%
3.7.5.1	88	2.65%
3.7.7.1	58	1.74%
3.6.3.1	53	1.59%
3.7.0.5	46	1.38%
3.7.0.3	43	1.29%
3.7.0.7	36	1.08%
Other	23	0.69%
CommuniGate Pro (3,189 servers)
Version	Number of Servers	Percent
5.1.16	249	7.81%
5.4.7	143	4.48%
5.4.4	140	4.39%
5.4.6	138	4.33%
4.1.8	137	4.30%
5.4.5	124	3.89%
5.2.20	104	3.26%
5.3.13	91	2.85%
5.4.1	85	2.67%
4.2.10	78	2.45%
5.2.16	78	2.45%
5.4.2	74	2.32%
5.2.3	65	2.04%
5.0.14	64	2.01%
5.1.12	62	1.94%
5.2.19	60	1.88%
5.3.15	60	1.88%
5.4.3	59	1.85%
5.2.14	47	1.47%
5.2.12	42	1.32%
5.4.0	39	1.22%
5.3.8	39	1.22%
5.2.13	37	1.16%
5.3.9	37	1.16%
5.4	37	1.16%
5.1.13	37	1.16%
5.3.10	35	1.10%
5.3.12	34	1.07%
6.0	34	1.07%
Other	960	30.10%
XMail (2,167 servers)
Version	Number of Servers	Percent
1.27	581	26.81%
1.22	502	23.17%
1.25	380	17.54%
1.26	252	11.63%
1.24	172	7.94%
1.21	83	3.83%
1.23	50	2.31%
1.17	32	1.48%
1.20	31	1.43%
Other	84	3.88%
Qmail Toaster (1,677 servers)
Version	Number of Servers	Percent
1.3	1,594	95.05%
1.2	50	2.98%
Other	33	1.97%
Kerio (1,673 servers)
Version	Number of Servers	Percent
6.7.3	261	15.60%
6.6.2	167	9.98%
6.7.0	154	9.21%
6.5.0	127	7.59%
6.5.2	104	6.22%
6.4.1	100	5.98%
6.7.2	99	5.92%
6.7.1	87	5.20%
6.3.1	74	4.42%
6.4.0	65	3.89%
6.6.1	59	3.53%
6.5.1	58	3.47%
6.6.0	58	3.47%
6.4.2	35	2.09%
6.3.0	33	1.97%
6.2.0	19	1.14%
6.0.10	19	1.14%
6.1.4	18	1.08%
Other	136	8.13%
Merak (1,276 servers)
Version	Number of Servers	Percent
8.0.3	504	39.50%
8.9.1	136	10.66%
8.5.0	94	7.37%
7.5.2	60	4.70%
8.3.8	56	4.39%
7.6.4	54	4.23%
7.4.5	51	4.00%
7.4.2	26	2.04%
9.0.0	24	1.88%
7.2.0	19	1.49%
7.6.1	18	1.41%
8.9.0	17	1.33%
7.0.1	17	1.33%
8.2.4	16	1.25%
6.2.1	15	1.18%
4.4.2	15	1.18%
8.3.15	15	1.18%
Other	139	10.89%
SurgeSMTP (1,054 servers)
Version	Number of Servers	Percent
6.1c-1	233	22.11%
5.3h2-2	133	12.62%
5.2a-1	108	10.25%
3.9e-1	63	5.98%
6.0a5-5	53	5.03%
6.0a4-4	33	3.13%
3.8k4-4	30	2.85%
4.0u4-4	25	2.37%
5.0e4-4	22	2.09%
4.2d2-2	20	1.90%
3.8i3-3	16	1.52%
5.3h-1	15	1.42%
3.9h-18	14	1.33%
6.0a3-3	13	1.23%
4.2d4-4	12	1.14%
5.0e3-3	12	1.14%
3.6f5-5	12	1.14%
4.3g2-2	12	1.14%
3.7b8-8	11	1.04%
3.9c-1	11	1.04%
4.3g4-4	11	1.04%
Other	195	18.50%
ArGoSoft (770 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	187	24.29%
1.8 (1.8.9.5)	113	14.68%
1.8 (1.8.9.3)	100	12.99%
1.8 (1.8.9.1)	75	9.74%
1.8 (1.8.8.8)	55	7.14%
1.8 (1.8.8.7)	45	5.84%
1.8 (1.8.9.2)	26	3.38%
1.8 (1.8.9.4)	21	2.73%
1.8 (1.8.6.0)	16	2.08%
1.8 (1.8.8.1)	13	1.69%
1.8 (1.8.8.9)	12	1.56%
Other	107	13.90%
GroupWise (531 servers)
Version	Number of Servers	Percent
8.0.2	110	20.72%
7.0.3	102	19.21%
6.5.7	62	11.68%
7.0.4	36	6.78%
7.0.2	32	6.03%
6.5.6	24	4.52%
8.0.1	22	4.14%
6.5.4	21	3.95%
7.0.1	19	3.58%
6.0.4	15	2.82%
6.5.1	14	2.64%
12.0.0	12	2.26%
8.0.0	11	2.07%
7.0	9	1.69%
8.0.3	8	1.51%
12.0.1	7	1.32%
6.5.5	7	1.32%
Other	20	3.77%
Post.Office (378 servers)
Version	Number of Servers	Percent
3.5.3	52	13.76%
4.1.0.2	35	9.26%
4.1.2.4	28	7.41%
4.0.1	27	7.14%
4.1.1	15	3.97%
3.5.3J	14	3.70%
3.9.2.3	14	3.70%
3.8.3	13	3.44%
4.2	12	3.17%
4.1.0.3	10	2.65%
3.9.2	10	2.65%
3.1.2	9	2.38%
4.0.1.1	9	2.38%
3.1.2J	9	2.38%
3.6.2	8	2.12%
3.8.7.4	8	2.12%
4.1.0.4	8	2.12%
4.1.2.3	7	1.85%
3.9.1.2	6	1.59%
4.2.1	6	1.59%
3.9.1	6	1.59%
4.2.1.1	6	1.59%
3.9.1.3	5	1.32%
4.2.1.3	5	1.32%
4.1.2.2	5	1.32%
3.9.2.2	4	1.06%
4.1	4	1.06%
4.0.0.1	4	1.06%
3.9.2.1	4	1.06%
3.5.1	4	1.06%
Other	31	8.20%
Trend Micro (364 servers)
Version	Number of Servers	Percent
5.7	143	39.29%
5.5	85	23.35%
5.18	66	18.13%
7.0	36	9.89%
7.1	23	6.32%
Other	11	3.02%
Gordano Messaging Suite (GMS) (354 servers)
Version	Number of Servers	Percent
Other	354	100.00%
MagicMail (315 servers)
Version	Number of Servers	Percent
Other	315	100.00%
Mirapoint (172 servers)
Version	Number of Servers	Percent
3.10.10a-GA	21	12.21%
4.1.10-GA	14	8.14%
4.2.3-GA	14	8.14%
4.3.5-GA	10	5.81%
4.1.9-GA	10	5.81%
4.1.3-GA	8	4.65%
3.10.5-GA	8	4.65%
3.10.9-GA	8	4.65%
4.3.3-GA	8	4.65%
3.10.8-GA	7	4.07%
4.1.4-GA	6	3.49%
3.8.3-GA	6	3.49%
3.8.4-GA	5	2.91%
3.10.7-GA	5	2.91%
4.2.4-GA	5	2.91%
3.8.5-GA	4	2.33%
4.3.4-GA	4	2.33%
4.1.8-GA	4	2.33%
3.8.6-GA	3	1.74%
3.8.7a	3	1.74%
3.7.5a-GA	3	1.74%
4.1.5-GA	3	1.74%
3.10.3-GA	2	1.16%
3.10.2-GA	2	1.16%
4.0.5a	2	1.16%
Other	7	4.07%
InterScan VirusWall (135 servers)
Version	Number of Servers	Percent
Other	135	100.00%
VisNetic (128 servers)
Version	Number of Servers	Percent
9.3.2.0	37	28.91%
9.1.4.1	18	14.06%
5.5.8.3	7	5.47%
8.0.3.1	6	4.69%
8.5.0.8	6	4.69%
5.8.6.6	5	3.91%
7.6.1.0	5	3.91%
6.2.2.0	4	3.12%
8.0.3.0	4	3.12%
8.0.3	4	3.12%
5.0.2.3	4	3.12%
7.2.4.1	3	2.34%
9.1.4.0	3	2.34%
8.3.5.0	2	1.56%
5.3.5.0	2	1.56%
5.4.5.4	2	1.56%
5.8.6.4	2	1.56%
6.0.9.0	2	1.56%
Other	12	9.38%
Mercury (54 servers)
Version	Number of Servers	Percent
1.48	29	53.70%
3.32	16	29.63%
3.01a	2	3.70%
1.47	2	3.70%
3.21c	2	3.70%
3.21	1	1.85%
1.44	1	1.85%
3.30	1	1.85%
Other	0	0.00%
Interscan (49 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	11	22.45%
3.81-Build_1022	10	20.41%
3.55 (build 1029)	6	12.24%
3.8-Build_3013	4	8.16%
3.53 (build 1493)	3	6.12%
3.53 (build 2011)	3	6.12%
3.53 (build 2017)	3	6.12%
3.53 (build 2013)	2	4.08%
3.81-Build_1084	2	4.08%
3.5 (build 1294)	1	2.04%
3.51 (build 1337)	1	2.04%
3.55 (build 1020)	1	2.04%
3.8-Build_3045	1	2.04%
3.8-Build_1080	1	2.04%
Other	0	0.00%
NetIQ MailMarshal (38 servers)
Version	Number of Servers	Percent
6.0.3.8	27	71.05%
5.5.6.7	4	10.53%
5.5.6.5	2	5.26%
5.5.6.6	2	5.26%
5.5.4.17	1	2.63%
6.1.3.15	1	2.63%
5.5.4.16	1	2.63%
Other	0	0.00%
WebSTAR V (30 servers)
Version	Number of Servers	Percent
5.4.1	15	50.00%
5.4.0	9	30.00%
5.3.3	3	10.00%
5.3.2	2	6.67%
5.3.4	1	3.33%
Other	0	0.00%
Neon Mail Server (27 servers)
Version	Number of Servers	Percent
3.0.7	7	25.93%
3.1.3	6	22.22%
3.1.0	4	14.81%
3.1.4	3	11.11%
3.1.2	3	11.11%
3.1.1	1	3.70%
3.1.5	1	3.70%
3.0.6	1	3.70%
3.0.9	1	3.70%
Other	0	0.00%
OpenSMTPD (22 servers)
Version	Number of Servers	Percent
Other	22	100.00%
OpenVMS (18 servers)
Version	Number of Servers	Percent
8.3	8	44.44%
8.4	5	27.78%
7.3	3	16.67%
6.1	1	5.56%
8.2	1	5.56%
Other	0	0.00%
MessageWall (18 servers)
Version	Number of Servers	Percent
1.0.8	17	94.44%
1.0.6	1	5.56%
Other	0	0.00%
ModusMail (13 servers)
Version	Number of Servers	Percent
4.35.477.0	5	38.46%
4.35.480.0	2	15.38%
4.1.361.21	1	7.69%
3.2.315.0	1	7.69%
4.0.340.3	1	7.69%
4.3.459.0	1	7.69%
4.35.477.8	1	7.69%
3.1.302.0	1	7.69%
Other	0	0.00%
WebSTAR (12 servers)
Version	Number of Servers	Percent
Other	12	100.00%
MAILsweeper (5 servers)
Version	Number of Servers	Percent
4.3.17.0	2	40.00%
4.3.19.0	2	40.00%
4.3.20.0	1	20.00%
Other	0	0.00%