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	2,082,017	100.0%
Number of Servers that didn't respond	347,255	16.68%
Server didn't open socket	333,887	16.04%
Server didn't provide banner	13,368	0.64%
Server provided banner	1,734,762	83.32%
Server banner identifies software in use	955,985	45.92%

As indicated by the above table, of the 2,082,017 servers queried, only 955,985 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	314,512	32.90%
Postfix	198,482	20.76%
Microsoft	176,603	18.47%
Sendmail	163,949	17.15%
MailEnable	29,830	3.12%
MDaemon	22,765	2.38%
IMail	13,596	1.42%
Kerio	5,697	0.60%
Lotus Domino	5,456	0.57%
WinWebMail	4,988	0.52%
CommuniGate Pro	3,939	0.41%
Merak	2,834	0.30%
XMail	2,623	0.27%
Qmail Toaster	1,737	0.18%
ArGoSoft	1,536	0.16%
GroupWise	1,463	0.15%
SurgeSMTP	1,427	0.15%
Trend Micro	1,071	0.11%
Gordano Messaging Suite (GMS)	613	0.06%
Post.Office	582	0.06%
MagicMail	474	0.05%
Mirapoint	409	0.04%
VisNetic	330	0.03%
InterScan VirusWall	326	0.03%
NetIQ MailMarshal	178	0.02%
Interscan	139	0.01%
Mercury	96	0.01%
WebSTAR V	83	0.01%
Neon Mail Server	79	0.01%
ModusMail	39	0.00%
MessageWall	36	0.00%
WebSTAR	34	0.00%
MAILsweeper	28	0.00%
OpenVMS	26	0.00%
OpenSMTPD	5	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (314,512 servers)
Version	Number of Servers	Percent
4.69	265,650	84.46%
4.67	13,866	4.41%
4.63	13,221	4.20%
4.71	5,970	1.90%
4.66	3,162	1.01%
Other	12,643	4.02%
Postfix (198,482 servers)
Version	Number of Servers	Percent
Other	198,482	100.00%
Microsoft (176,603 servers)
Version	Number of Servers	Percent
6.0.3790.3959	116,516	65.98%
6.0.3790.4675	37,837	21.42%
6.0.3790.1830	12,422	7.03%
5.0.2195.6713	5,037	2.85%
Other	4,791	2.71%
Sendmail (163,949 servers)
Version	Number of Servers	Percent
8.13.1	32,308	19.71%
8.13.8	25,543	15.58%
8.14.3	15,207	9.28%
8.12.11.20060614	13,725	8.37%
8.12.11.20060308	13,187	8.04%
8.13.6.20060614	8,314	5.07%
8.14.4	8,111	4.95%
8.13.6	7,001	4.27%
8.12.10	5,749	3.51%
8.11.6	5,519	3.37%
8.14.2	5,162	3.15%
8.14.1	3,928	2.40%
8.12.11	3,837	2.34%
8.13.4	3,051	1.86%
8.13.7	2,978	1.82%
8.12.8	2,566	1.57%
Other	7,763	4.74%
MailEnable (29,830 servers)
Version	Number of Servers	Percent
1.986--	8,862	29.71%
1.981--	3,497	11.72%
1.983--	2,214	7.42%
3.62--	1,448	4.85%
0-3.63-	769	2.58%
1.96--	655	2.20%
1.95--	644	2.16%
4.22--	611	2.05%
1.9--	501	1.68%
0-3.61-	445	1.49%
0-1.87-	436	1.46%
4.17--	434	1.45%
0-3.6-	432	1.45%
0-2.53-	431	1.44%
--3.63	375	1.26%
0-4.22-	369	1.24%
4.0--	350	1.17%
0-3.14-	344	1.15%
0-3.62-	336	1.13%
4.22--4.22	334	1.12%
1.8--	328	1.10%
Other	6,015	20.16%
MDaemon (22,765 servers)
Version	Number of Servers	Percent
11.0.0	3,344	14.69%
10.1.2	3,282	14.42%
10.1.1	1,520	6.68%
10.0.0	1,418	6.23%
9.6.1	981	4.31%
9.6.6	866	3.80%
10.1.0	843	3.70%
10.0.5	752	3.30%
9.6.5	639	2.81%
9.5.2	605	2.66%
10.0.4	558	2.45%
10.0.2	546	2.40%
9.5.1	512	2.25%
9.6.4	502	2.21%
8.1.3	477	2.10%
9.5.6	447	1.96%
9.6.2	443	1.95%
9.0.4	412	1.81%
9.6.3	293	1.29%
7.2.3	279	1.23%
6.8.5	273	1.20%
9.5.5	263	1.16%
9.0.1	250	1.10%
Other	3,260	14.32%
IMail (13,596 servers)
Version	Number of Servers	Percent
8.22	2,564	18.86%
11.01	1,342	9.87%
8.15	1,311	9.64%
9.23	996	7.33%
11.0	877	6.45%
10.02	870	6.40%
8.05	682	5.02%
9.10	533	3.92%
9.20	491	3.61%
7.07	477	3.51%
10.01	433	3.18%
9.21	374	2.75%
7.15	322	2.37%
6.06	276	2.03%
8.00	261	1.92%
8.04	201	1.48%
8.21	156	1.15%
8.10	146	1.07%
8.01	142	1.04%
Other	1,142	8.40%
Kerio (5,697 servers)
Version	Number of Servers	Percent
6.7.3	1,126	19.76%
6.7.2	694	12.18%
6.6.2	618	10.85%
6.7.0	597	10.48%
6.7.1	337	5.92%
6.5.0	310	5.44%
6.5.2	292	5.13%
6.4.1	228	4.00%
6.3.1	216	3.79%
6.5.1	162	2.84%
6.6.0	153	2.69%
6.4.0	152	2.67%
6.4.2	117	2.05%
6.6.1	114	2.00%
6.3.0	93	1.63%
Other	488	8.57%
Lotus Domino (5,456 servers)
Version	Number of Servers	Percent
8.5.1	668	12.24%
8.5	496	9.09%
7.0.2	400	7.33%
8.0.2	257	4.71%
7.0.3	238	4.36%
8.0.1	235	4.31%
7.0.1	214	3.92%
6.5.4	187	3.43%
8.5.1FP1	186	3.41%
6.5.1	176	3.23%
8.5.1FP2	159	2.91%
6.5.3	154	2.82%
7.0.3FP1	152	2.79%
7.0.2FP2	136	2.49%
8.5FP1	131	2.40%
6.5.5	130	2.38%
8.0	130	2.38%
7.0	126	2.31%
6.5	109	2.00%
5.0.11	72	1.32%
7.0.2FP3	65	1.19%
Other	1,035	18.97%
WinWebMail (4,988 servers)
Version	Number of Servers	Percent
3.8.0.1	1,415	28.37%
3.7.6.1	884	17.72%
3.7.7.3	664	13.31%
3.7.3.1	648	12.99%
3.7.1.1	349	7.00%
3.7.5.1	235	4.71%
3.6.3.1	171	3.43%
3.7.7.1	167	3.35%
3.7.0.5	150	3.01%
3.7.0.3	119	2.39%
3.7.0.7	105	2.11%
Other	81	1.62%
CommuniGate Pro (3,939 servers)
Version	Number of Servers	Percent
5.1.16	243	6.17%
5.2.16	236	5.99%
4.1.8	232	5.89%
5.3.5	178	4.52%
4.2.10	156	3.96%
5.2.19	143	3.63%
5.3.2	127	3.22%
5.2.14	123	3.12%
5.2.12	96	2.44%
5.2.3	94	2.39%
5.2.13	91	2.31%
5.1.12	90	2.28%
5.2.8	89	2.26%
5.2.18	82	2.08%
5.0.14	78	1.98%
5.1.13	78	1.98%
5.2.10	71	1.80%
5.3.4	70	1.78%
5.0.9	61	1.55%
5.1.14	60	1.52%
5.2.17	56	1.42%
5.2.9	55	1.40%
5.2.11	53	1.35%
5.2.6	50	1.27%
5.1.9	48	1.22%
5.3.3	47	1.19%
5.2.0	45	1.14%
5.3.1	44	1.12%
4.2.9	41	1.04%
5.2.15	40	1.02%
Other	1,062	26.96%
Merak (2,834 servers)
Version	Number of Servers	Percent
8.0.3	1,195	42.17%
8.9.1	272	9.60%
8.5.0	170	6.00%
7.4.5	139	4.90%
7.5.2	133	4.69%
7.6.4	117	4.13%
8.3.8	113	3.99%
7.4.2	45	1.59%
8.2.13	45	1.59%
9.0.0	41	1.45%
7.2.0	36	1.27%
7.6.1	36	1.27%
8.2.4	33	1.16%
8.3.15	33	1.16%
6.2.1	30	1.06%
7.0.1	29	1.02%
Other	367	12.95%
XMail (2,623 servers)
Version	Number of Servers	Percent
1.25	675	25.73%
1.22	635	24.21%
1.24	365	13.92%
1.26	357	13.61%
1.21	151	5.76%
1.23	77	2.94%
1.20	71	2.71%
1.17	64	2.44%
1.12	58	2.21%
1.27	53	2.02%
Other	117	4.46%
Qmail Toaster (1,737 servers)
Version	Number of Servers	Percent
1.3	1,570	90.39%
1.2	126	7.25%
1.0	29	1.67%
Other	12	0.69%
ArGoSoft (1,536 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.5)	277	18.03%
1.8 (1.8.9.6)	271	17.64%
1.8 (1.8.9.3)	196	12.76%
1.8 (1.8.9.1)	134	8.72%
1.8 (1.8.8.8)	123	8.01%
1.8 (1.8.8.7)	93	6.05%
1.8 (1.8.9.2)	65	4.23%
1.8 (1.8.9.4)	46	2.99%
1.8 (1.8.8.1)	34	2.21%
1.8 (1.8.8.9)	33	2.15%
1.8 (1.8.9.0)	26	1.69%
1.8 (1.8.6.0)	24	1.56%
Other	214	13.93%
GroupWise (1,463 servers)
Version	Number of Servers	Percent
7.0.3	438	29.94%
8.0.1	181	12.37%
7.0.2	178	12.17%
6.5.7	168	11.48%
7.0.1	92	6.29%
6.5.4	86	5.88%
8.0.0	61	4.17%
6.5.6	54	3.69%
6.0.4	51	3.49%
6.5.1	41	2.80%
6.5.5	25	1.71%
7.0	16	1.09%
Other	72	4.92%
SurgeSMTP (1,427 servers)
Version	Number of Servers	Percent
4.2d4-4	317	22.21%
3.9e-1	190	13.31%
4.2d2-2	109	7.64%
4.0u4-4	98	6.87%
3.8k4-4	86	6.03%
4.3c-1	74	5.19%
4.3e-1	54	3.78%
4.2a3-3	50	3.50%
3.8i3-3	36	2.52%
3.7b8-8	35	2.45%
3.8f3-3	31	2.17%
3.9c-1	30	2.10%
3.6f5-5	26	1.82%
3.9g2-2	21	1.47%
3.8f2-2	17	1.19%
Other	253	17.73%
Trend Micro (1,071 servers)
Version	Number of Servers	Percent
5.7	488	45.56%
5.5	313	29.23%
5.18	160	14.94%
7.0	82	7.66%
7	12	1.12%
Other	16	1.49%
Gordano Messaging Suite (GMS) (613 servers)
Version	Number of Servers	Percent
Other	613	100.00%
Post.Office (582 servers)
Version	Number of Servers	Percent
3.5.3	99	17.01%
4.1.0.2	65	11.17%
4.0.1	50	8.59%
3.5.3J	43	7.39%
3.8.3	26	4.47%
4.1.1	22	3.78%
4.1.0.4	21	3.61%
3.9.2.3	18	3.09%
3.6.3	18	3.09%
3.1.2J	18	3.09%
3.9.1	15	2.58%
3.6.2	15	2.58%
3.9.2	13	2.23%
3.1.2	12	2.06%
4.1	12	2.06%
3.8.7.4	12	2.06%
4.0.0.2	11	1.89%
4.1.0.3	9	1.55%
3.9.0	9	1.55%
4.0.1.1	8	1.37%
4.0.0.1	8	1.37%
3.9.2.1	8	1.37%
3.8.4	8	1.37%
3.9.1.2	7	1.20%
3.9.1.3	6	1.03%
3.5.2	6	1.03%
Other	43	7.39%
MagicMail (474 servers)
Version	Number of Servers	Percent
Other	474	100.00%
Mirapoint (409 servers)
Version	Number of Servers	Percent
3.8.4-GA	47	11.49%
3.8.3-GA	39	9.54%
3.10.8-GA	38	9.29%
3.10.5-GA	35	8.56%
3.10.7-GA	30	7.33%
3.10.4-GA	23	5.62%
4.1.8-GA	18	4.40%
3.10.9-GA	18	4.40%
4.1.3-GA	16	3.91%
3.10.6-GA	15	3.67%
3.10.3-GA	14	3.42%
4.1.9-GA	11	2.69%
3.8.6-GA	11	2.69%
3.8.7a	11	2.69%
4.1.4-GA	10	2.44%
3.8.2-GA	9	2.20%
3.8.5-GA	8	1.96%
3.7.5a-GA	8	1.96%
4.1.5-GA	7	1.71%
4.0.5a	6	1.47%
3.10.2-GA	6	1.47%
4.1.6-GA	5	1.22%
Other	24	5.87%
VisNetic (330 servers)
Version	Number of Servers	Percent
9.3.2.0	131	39.70%
9.1.4.1	41	12.42%
5.8.6.6	17	5.15%
8.5.0.8	14	4.24%
6.2.2.0	10	3.03%
5.5.8.3	10	3.03%
8.0.3.1	9	2.73%
8.3.5.0	8	2.42%
9.1.4.0	8	2.42%
8.0.3.0	7	2.12%
8.0.3	7	2.12%
7.6.1.0	7	2.12%
8.3.6	6	1.82%
5.3.5.0	6	1.82%
7.2.4.1	6	1.82%
5.4.5.4	6	1.82%
5.0.2.3	5	1.52%
7.2.4.0	4	1.21%
Other	28	8.48%
InterScan VirusWall (326 servers)
Version	Number of Servers	Percent
Other	326	100.00%
NetIQ MailMarshal (178 servers)
Version	Number of Servers	Percent
6.0.3.8	135	75.84%
5.5.6.7	13	7.30%
6.1.3.15	10	5.62%
5.5.4.16	4	2.25%
5.5.6.6	3	1.69%
5.5.6.5	3	1.69%
5.5.3.17	2	1.12%
5.5.4.17	2	1.12%
5.5.5.6	2	1.12%
Other	4	2.25%
Interscan (139 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	26	18.71%
3.81-Build_1022	19	13.67%
3.53 (build 2017)	16	11.51%
3.55 (build 1029)	13	9.35%
3.81-Build_1084	11	7.91%
3.8-Build_3013	8	5.76%
3.53 (build 2011)	8	5.76%
3.53 (build 1493)	6	4.32%
3.55 (build 1020)	6	4.32%
3.53 (build 2013)	5	3.60%
3.52 (build 1375)	4	2.88%
3.53 (build 1494)	2	1.44%
3.81-Build_1055	2	1.44%
3.8-Build_1080	2	1.44%
Other	11	7.91%
Mercury (96 servers)
Version	Number of Servers	Percent
1.48	51	53.12%
3.32	26	27.08%
3.21c	7	7.29%
1.47	3	3.12%
1.44	2	2.08%
1.49	2	2.08%
3.21	1	1.04%
3.01a	1	1.04%
4.52	1	1.04%
3.31	1	1.04%
3.30	1	1.04%
Other	0	0.00%
WebSTAR V (83 servers)
Version	Number of Servers	Percent
5.4.1	28	33.73%
5.4.0	22	26.51%
5.3.4	19	22.89%
5.3.2	7	8.43%
5.3.3	5	6.02%
5.3.0	1	1.20%
5.3.1	1	1.20%
Other	0	0.00%
Neon Mail Server (79 servers)
Version	Number of Servers	Percent
3.1.3	20	25.32%
3.0.7	15	18.99%
3.0.9	11	13.92%
3.1.4	10	12.66%
3.1.2	7	8.86%
3.1.0	5	6.33%
3.1.5	5	6.33%
3.1.1	3	3.80%
3.0.8	1	1.27%
3.0.6	1	1.27%
3.0.5	1	1.27%
Other	0	0.00%
ModusMail (39 servers)
Version	Number of Servers	Percent
4.35.477.0	10	25.64%
4.35.480.0	7	17.95%
3.1.302.0	5	12.82%
4.2.420.0	5	12.82%
4.1.361.21	2	5.13%
3.2.315.0	2	5.13%
3.1.293.1	2	5.13%
4.35.480.11	2	5.13%
4.2.425.22	1	2.56%
4.0.340.3	1	2.56%
4.3.459.0	1	2.56%
4.35.477.8	1	2.56%
Other	0	0.00%
MessageWall (36 servers)
Version	Number of Servers	Percent
1.0.8	29	80.56%
1.0.11	5	13.89%
1.0.6	1	2.78%
1.1.0	1	2.78%
Other	0	0.00%
WebSTAR (34 servers)
Version	Number of Servers	Percent
Other	34	100.00%
MAILsweeper (28 servers)
Version	Number of Servers	Percent
4.3.20.0	7	25.00%
4.3.14.0	5	17.86%
4.3.17.0	4	14.29%
4.3.1.0	4	14.29%
4.3.6.0	3	10.71%
4.2.10.0	2	7.14%
4.3.19.0	1	3.57%
4.3.10.0	1	3.57%
4.2.5.0	1	3.57%
Other	0	0.00%
OpenVMS (26 servers)
Version	Number of Servers	Percent
8.3	15	57.69%
7.3	7	26.92%
8.2	2	7.69%
6.1	1	3.85%
7.2	1	3.85%
Other	0	0.00%
OpenSMTPD (5 servers)
Version	Number of Servers	Percent
Other	5	100.00%