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	1,806,166	100.0%
Number of Servers that didn't respond	287,381	15.91%
Server didn't open socket	276,152	15.29%
Server didn't provide banner	11,229	0.62%
Server provided banner	1,518,785	84.09%
Server banner identifies software in use	856,656	47.43%

As indicated by the above table, of the 1,806,166 servers queried, only 856,656 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	243,237	28.39%
Sendmail	176,426	20.59%
Microsoft	173,315	20.23%
Postfix	162,318	18.95%
MailEnable	25,690	3.00%
MDaemon	21,209	2.48%
IMail	15,552	1.82%
Kerio	6,193	0.72%
Lotus Domino	5,379	0.63%
WinWebMail	4,944	0.58%
CommuniGate Pro	4,006	0.47%
Merak	3,660	0.43%
XMail	2,497	0.29%
ArGoSoft	1,777	0.21%
GroupWise	1,748	0.20%
Qmail Toaster	1,682	0.20%
Trend Micro	1,497	0.17%
SurgeSMTP	1,443	0.17%
Gordano Messaging Suite (GMS)	689	0.08%
Post.Office	627	0.07%
Mirapoint	475	0.06%
InterScan VirusWall	416	0.05%
VisNetic	388	0.05%
MagicMail	364	0.04%
NetIQ MailMarshal	269	0.03%
Interscan	239	0.03%
Neon Mail Server	147	0.02%
WebSTAR V	124	0.01%
Mercury	113	0.01%
ModusMail	64	0.01%
MessageWall	52	0.01%
WebSTAR	46	0.01%
MAILsweeper	45	0.01%
OpenVMS	25	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (243,237 servers)
Version	Number of Servers	Percent
4.69	194,485	79.96%
4.63	15,418	6.34%
4.67	11,388	4.68%
4.68	4,239	1.74%
4.66	4,073	1.67%
4.60	3,452	1.42%
4.50	2,581	1.06%
4.62	2,551	1.05%
Other	5,050	2.08%
Sendmail (176,426 servers)
Version	Number of Servers	Percent
8.13.1	32,527	18.44%
8.13.8	19,776	11.21%
8.12.11.20060614	16,834	9.54%
8.12.11.20060308	15,491	8.78%
8.14.3	13,890	7.87%
8.13.6	13,482	7.64%
8.13.6.20060614	10,407	5.90%
8.12.10	7,774	4.41%
8.11.6	7,431	4.21%
8.14.1	6,325	3.59%
8.14.2	6,081	3.45%
8.12.11	5,001	2.83%
8.13.4	4,224	2.39%
8.13.7	3,875	2.20%
8.12.8	3,363	1.91%
8.9.3	2,004	1.14%
Other	7,941	4.50%
Microsoft (173,315 servers)
Version	Number of Servers	Percent
6.0.3790.3959	142,102	81.99%
6.0.3790.1830	18,026	10.40%
5.0.2195.6713	8,806	5.08%
6.0.3790.211	1,970	1.14%
Other	2,411	1.39%
Postfix (162,318 servers)
Version	Number of Servers	Percent
Other	162,318	100.00%
MailEnable (25,690 servers)
Version	Number of Servers	Percent
1.986--	5,762	22.43%
1.981--	4,280	16.66%
1.983--	2,703	10.52%
3.62--	1,037	4.04%
0-3.61-	894	3.48%
1.95--	884	3.44%
1.96--	878	3.42%
0-3.6-	741	2.88%
1.9--	703	2.74%
--3.61	610	2.37%
1.8--	500	1.95%
0-2.37-	467	1.82%
0-3.14-	434	1.69%
0-1.85-	355	1.38%
0-1.87-	338	1.32%
--3.6	333	1.30%
0-2.53-	328	1.28%
0-3.53-	320	1.25%
Other	4,123	16.05%
MDaemon (21,209 servers)
Version	Number of Servers	Percent
10.0.5	4,628	21.82%
10.0.4	1,548	7.30%
10.0.0	1,189	5.61%
9.6.1	1,135	5.35%
9.6.6	1,131	5.33%
9.6.5	905	4.27%
10.0.2	732	3.45%
9.5.2	696	3.28%
9.6.4	634	2.99%
9.6.2	611	2.88%
8.1.3	600	2.83%
9.5.6	572	2.70%
9.5.1	548	2.58%
9.0.4	531	2.50%
10.0.1	379	1.79%
9.6.3	357	1.68%
7.2.3	335	1.58%
6.8.5	327	1.54%
10.0.3	320	1.51%
7.2.0	285	1.34%
9.0.1	280	1.32%
9.5.5	242	1.14%
9.0.0	217	1.02%
Other	3,007	14.18%
IMail (15,552 servers)
Version	Number of Servers	Percent
8.22	3,044	19.57%
10.02	1,620	10.42%
8.15	1,555	10.00%
9.23	1,186	7.63%
8.05	852	5.48%
9.10	656	4.22%
10.01	594	3.82%
11.0	590	3.79%
7.07	566	3.64%
9.20	535	3.44%
9.21	464	2.98%
7.15	415	2.67%
6.06	367	2.36%
8.00	352	2.26%
9.22	350	2.25%
8.04	291	1.87%
8.21	270	1.74%
10.0	234	1.50%
8.01	193	1.24%
8.10	192	1.23%
8.20	156	1.00%
Other	1,070	6.88%
Kerio (6,193 servers)
Version	Number of Servers	Percent
6.6.2	1,734	28.00%
6.7.0	1,058	17.08%
6.5.2	507	8.19%
6.5.0	416	6.72%
6.4.1	326	5.26%
6.6.0	313	5.05%
6.3.1	266	4.30%
6.5.1	252	4.07%
6.6.1	242	3.91%
6.4.0	197	3.18%
6.4.2	166	2.68%
6.3.0	129	2.08%
Other	587	9.48%
Lotus Domino (5,379 servers)
Version	Number of Servers	Percent
8.5	620	11.53%
7.0.2	458	8.51%
8.0.2	377	7.01%
8.0.1	335	6.23%
7.0.3	323	6.00%
6.5.4	255	4.74%
7.0.1	250	4.65%
6.5.1	211	3.92%
7.0.2FP2	201	3.74%
7.0.3FP1	194	3.61%
6.5.3	193	3.59%
6.5.5	162	3.01%
8.0	157	2.92%
7.0	149	2.77%
6.5	139	2.58%
5.0.11	86	1.60%
8.0.2FP1	83	1.54%
7.0.2FP1	81	1.51%
6.5.2	79	1.47%
7.0.2FP3	62	1.15%
6.5.6	57	1.06%
5.0.12	54	1.00%
Other	853	15.86%
WinWebMail (4,944 servers)
Version	Number of Servers	Percent
3.7.6.1	1,087	21.99%
3.7.3.1	893	18.06%
3.7.7.3	776	15.70%
3.8.0.1	466	9.43%
3.7.1.1	451	9.12%
3.7.5.1	291	5.89%
3.6.3.1	258	5.22%
3.7.7.1	201	4.07%
3.7.0.5	199	4.03%
3.7.0.3	145	2.93%
3.7.0.7	136	2.75%
Other	41	0.83%
CommuniGate Pro (4,006 servers)
Version	Number of Servers	Percent
4.1.8	294	7.34%
5.2.14	238	5.94%
5.2.13	227	5.67%
5.2.12	219	5.47%
5.1.13	181	4.52%
5.1.16	166	4.14%
4.2.10	166	4.14%
5.2.8	146	3.64%
5.2.10	123	3.07%
5.1.12	118	2.95%
5.2.3	102	2.55%
5.2.11	93	2.32%
5.0.13	85	2.12%
5.1.14	84	2.10%
5.0.14	83	2.07%
5.2.6	77	1.92%
5.0.9	76	1.90%
5.2.5	74	1.85%
5.2.0	63	1.57%
5.2.9	58	1.45%
5.1.9	57	1.42%
4.2	50	1.25%
4.2.8	49	1.22%
5.1.8	48	1.20%
5.1.7	48	1.20%
5.2.7	46	1.15%
5.1.11	44	1.10%
5.1.10	43	1.07%
4.3.12	43	1.07%
4.2.9	43	1.07%
Other	862	21.52%
Merak (3,660 servers)
Version	Number of Servers	Percent
8.0.3	1,538	42.02%
8.9.1	332	9.07%
8.5.0	236	6.45%
7.4.5	200	5.46%
8.3.8	160	4.37%
7.5.2	155	4.23%
7.6.4	152	4.15%
7.4.2	76	2.08%
9.0.0	62	1.69%
7.2.0	56	1.53%
7.6.1	49	1.34%
8.2.13	47	1.28%
8.2.4	42	1.15%
8.9.0	39	1.07%
7.0.1	37	1.01%
Other	479	13.09%
XMail (2,497 servers)
Version	Number of Servers	Percent
1.25	760	30.44%
1.22	656	26.27%
1.24	445	17.82%
1.21	186	7.45%
1.20	88	3.52%
1.17	87	3.48%
1.23	82	3.28%
1.12	59	2.36%
Other	134	5.37%
ArGoSoft (1,777 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.5)	347	19.53%
1.8 (1.8.9.3)	251	14.12%
1.8 (1.8.9.1)	200	11.25%
1.8 (1.8.9.6)	162	9.12%
1.8 (1.8.8.8)	136	7.65%
1.8 (1.8.8.7)	124	6.98%
1.8 (1.8.9.2)	90	5.06%
1.8 (1.8.9.4)	47	2.64%
1.8 (1.8.8.9)	45	2.53%
1.8 (1.8.8.1)	38	2.14%
1.8 (1.8.9.0)	28	1.58%
1.8 (1.8.8.2)	24	1.35%
1.8 (1.8.6.0)	23	1.29%
Other	262	14.74%
GroupWise (1,748 servers)
Version	Number of Servers	Percent
7.0.3	597	34.15%
7.0.2	262	14.99%
6.5.7	219	12.53%
7.0.1	130	7.44%
6.5.4	113	6.46%
8.0.0	95	5.43%
6.5.6	70	4.00%
6.0.4	67	3.83%
6.5.1	45	2.57%
7.0	31	1.77%
6.5.5	31	1.77%
Other	88	5.03%
Qmail Toaster (1,682 servers)
Version	Number of Servers	Percent
1.3	1,454	86.44%
1.2	169	10.05%
1.0	39	2.32%
Other	20	1.19%
Trend Micro (1,497 servers)
Version	Number of Servers	Percent
5.7	713	47.63%
5.5	449	29.99%
5.18	218	14.56%
7.0	93	6.21%
Other	24	1.60%
SurgeSMTP (1,443 servers)
Version	Number of Servers	Percent
3.9e-1	474	32.85%
4.0u3-3	143	9.91%
3.9c-1	121	8.39%
3.8k4-4	118	8.18%
3.7b8-8	53	3.67%
3.9g2-2	53	3.67%
3.8f3-3	50	3.47%
3.8i3-3	41	2.84%
3.6f5-5	36	2.49%
3.9h-65	27	1.87%
3.8f2-2	25	1.73%
3.5b3-3	23	1.59%
4.0u-1	21	1.46%
3.0c2-2	20	1.39%
4.0a-1	16	1.11%
3.8k2-2	15	1.04%
Other	207	14.35%
Gordano Messaging Suite (GMS) (689 servers)
Version	Number of Servers	Percent
Other	689	100.00%
Post.Office (627 servers)
Version	Number of Servers	Percent
3.5.3	139	22.17%
4.1.0.2	58	9.25%
4.0.1	56	8.93%
3.5.3J	45	7.18%
3.8.3	31	4.94%
3.9.2.3	20	3.19%
3.9.1	20	3.19%
3.6.3	20	3.19%
3.1.2	19	3.03%
3.6.2	19	3.03%
3.9.2	17	2.71%
3.1.2J	17	2.71%
3.8.7.4	14	2.23%
3.9.0	12	1.91%
3.5.2	11	1.75%
3.8.4	11	1.75%
4.0.0.2	11	1.75%
4.1.0.3	10	1.59%
4.1	10	1.59%
3.9.2.1	9	1.44%
3.9.1.2	7	1.12%
3.9.1.3	7	1.12%
Other	64	10.21%
Mirapoint (475 servers)
Version	Number of Servers	Percent
3.8.4-GA	77	16.21%
3.8.3-GA	65	13.68%
3.10.4-GA	35	7.37%
3.10.5-GA	31	6.53%
3.8.7a	30	6.32%
3.10.3-GA	28	5.89%
3.8.6-GA	25	5.26%
4.1.3-GA	24	5.05%
3.7.5a-GA	23	4.84%
4.1.5-GA	18	3.79%
3.8.2-GA	18	3.79%
3.8.5-GA	15	3.16%
4.0.5a	13	2.74%
4.1.4-GA	13	2.74%
3.7.3a-GA	12	2.53%
3.10.2-GA	12	2.53%
3.7.4b-GA	10	2.11%
Other	26	5.47%
InterScan VirusWall (416 servers)
Version	Number of Servers	Percent
Other	416	100.00%
VisNetic (388 servers)
Version	Number of Servers	Percent
9.3.2.0	123	31.70%
9.1.4.1	52	13.40%
5.8.6.6	21	5.41%
5.0.2.3	15	3.87%
8.5.0.8	14	3.61%
5.5.8.3	13	3.35%
6.2.2.0	13	3.35%
8.0.3.0	12	3.09%
5.3.5.0	10	2.58%
8.3.6	10	2.58%
9.1.4.0	10	2.58%
7.2.4.1	10	2.58%
8.3.5.0	9	2.32%
8.0.3	9	2.32%
8.0.3.1	8	2.06%
5.4.5.4	8	2.06%
7.6.1.0	8	2.06%
5.8.6.4	4	1.03%
7.2.4.0	4	1.03%
5.0.2.1	4	1.03%
Other	31	7.99%
MagicMail (364 servers)
Version	Number of Servers	Percent
Other	364	100.00%
NetIQ MailMarshal (269 servers)
Version	Number of Servers	Percent
6.0.3.8	210	78.07%
5.5.6.7	16	5.95%
6.1.3.15	15	5.58%
5.5.4.16	7	2.60%
5.5.6.6	4	1.49%
5.5.6.5	4	1.49%
5.5.5.6	3	1.12%
5.5.4.17	3	1.12%
Other	7	2.60%
Interscan (239 servers)
Version	Number of Servers	Percent
3.8-Build_3013	54	22.59%
3.55 (build 1016)	43	17.99%
3.81-Build_1022	26	10.88%
3.55 (build 1029)	22	9.21%
3.53 (build 2017)	18	7.53%
3.53 (build 2011)	11	4.60%
3.81-Build_1084	10	4.18%
3.53 (build 1493)	8	3.35%
3.53 (build 2013)	7	2.93%
3.52 (build 1375)	6	2.51%
3.55 (build 1020)	6	2.51%
3.51 (build 1337)	3	1.26%
3.8-Build_3045	3	1.26%
Other	22	9.21%
Neon Mail Server (147 servers)
Version	Number of Servers	Percent
3.1.3	35	23.81%
3.0.7	26	17.69%
3.0.9	20	13.61%
3.1.4	19	12.93%
3.1.5	16	10.88%
3.1.2	14	9.52%
3.1.0	10	6.80%
3.0.8	3	2.04%
3.0.6	2	1.36%
Other	2	1.36%
WebSTAR V (124 servers)
Version	Number of Servers	Percent
5.4.1	38	30.65%
5.4.0	34	27.42%
5.3.4	29	23.39%
5.3.3	10	8.06%
5.3.2	9	7.26%
5.3.1	2	1.61%
Other	2	1.61%
Mercury (113 servers)
Version	Number of Servers	Percent
1.48	53	46.90%
3.32	35	30.97%
3.21c	10	8.85%
3.31	4	3.54%
1.47	4	3.54%
3.21	2	1.77%
Other	5	4.42%
ModusMail (64 servers)
Version	Number of Servers	Percent
3.2.315.0	16	25.00%
4.35.480.0	10	15.62%
4.35.477.0	9	14.06%
3.1.302.0	6	9.38%
4.2.420.0	5	7.81%
4.35.480.11	4	6.25%
4.3.459.0	4	6.25%
4.1.361.21	3	4.69%
3.1.293.1	2	3.12%
4.2.425.22	1	1.56%
4.1.361.0	1	1.56%
4.2.425.4	1	1.56%
4.0.340.3	1	1.56%
4.35.477.8	1	1.56%
Other	0	0.00%
MessageWall (52 servers)
Version	Number of Servers	Percent
1.0.8	35	67.31%
1.0.11	14	26.92%
1.1.0	2	3.85%
1.0.6	1	1.92%
Other	0	0.00%
WebSTAR (46 servers)
Version	Number of Servers	Percent
Other	46	100.00%
MAILsweeper (45 servers)
Version	Number of Servers	Percent
4.3.20.0	15	33.33%
4.3.14.0	7	15.56%
4.3.17.0	7	15.56%
4.2.10.0	4	8.89%
4.3.1.0	4	8.89%
4.3.19.0	3	6.67%
4.3.10.0	2	4.44%
4.3.12.0	1	2.22%
4.3.6.0	1	2.22%
4.2.5.0	1	2.22%
Other	0	0.00%
OpenVMS (25 servers)
Version	Number of Servers	Percent
8.3	15	60.00%
7.3	6	24.00%
8.2	2	8.00%
6.1	1	4.00%
7.2	1	4.00%
Other	0	0.00%