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	2,440,105	100.0%
Number of Servers that didn't respond	414,360	16.98%
Server didn't open socket	402,406	16.49%
Server didn't provide banner	11,954	0.49%
Server provided banner	2,025,745	83.02%
Server banner identifies software in use	1,108,556	45.43%

As indicated by the above table, of the 2,440,105 servers queried, only 1,108,556 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	514,018	46.37%
Postfix	274,508	24.76%
Sendmail	125,704	11.34%
Microsoft	107,420	9.69%
MailEnable	33,972	3.06%
MDaemon	21,410	1.93%
IMail	7,929	0.72%
Lotus Domino	4,817	0.43%
WinWebMail	3,618	0.33%
CommuniGate Pro	3,293	0.30%
XMail	2,265	0.20%
Kerio	1,793	0.16%
Qmail Toaster	1,692	0.15%
Merak	1,354	0.12%
SurgeSMTP	1,095	0.10%
ArGoSoft	848	0.08%
GroupWise	563	0.05%
Post.Office	398	0.04%
Trend Micro	394	0.04%
Gordano Messaging Suite (GMS)	358	0.03%
MagicMail	321	0.03%
Mirapoint	183	0.02%
InterScan VirusWall	148	0.01%
VisNetic	147	0.01%
Interscan	56	0.01%
Mercury	52	0.00%
NetIQ MailMarshal	44	0.00%
WebSTAR V	32	0.00%
Neon Mail Server	28	0.00%
MessageWall	23	0.00%
OpenSMTPD	22	0.00%
OpenVMS	17	0.00%
WebSTAR	14	0.00%
ModusMail	14	0.00%
MAILsweeper	6	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (514,018 servers)
Version	Number of Servers	Percent
4.77	357,817	69.61%
4.76	49,254	9.58%
4.69	44,808	8.72%
4.72	25,273	4.92%
4.80	8,954	1.74%
4.67	6,608	1.29%
4.63	5,303	1.03%
Other	16,001	3.11%
Postfix (274,508 servers)
Version	Number of Servers	Percent
Other	274,508	100.00%
Sendmail (125,704 servers)
Version	Number of Servers	Percent
8.13.8	33,683	26.80%
8.13.1	19,738	15.70%
8.14.3	16,486	13.11%
8.14.5	12,875	10.24%
8.14.4	11,372	9.05%
8.12.11.20060308	4,940	3.93%
8.13.6.20060614	3,890	3.09%
8.14.2	3,602	2.87%
8.11.6	2,551	2.03%
8.12.10	2,250	1.79%
8.14.1	2,029	1.61%
8.13.6	1,895	1.51%
8.12.11.20060614	1,876	1.49%
8.13.7	1,630	1.30%
8.12.11	1,353	1.08%
Other	5,534	4.40%
Microsoft (107,420 servers)
Version	Number of Servers	Percent
6.0.3790.4675	85,907	79.97%
6.0.3790.3959	12,508	11.64%
6.0.3790.1830	3,407	3.17%
7.5.7601.17514	1,544	1.44%
5.0.2195.7381	1,203	1.12%
Other	2,851	2.65%
MailEnable (33,972 servers)
Version	Number of Servers	Percent
1.986--	7,843	23.09%
5.10--	2,681	7.89%
4.26--	2,430	7.15%
1.981--	1,438	4.23%
6.0--	1,221	3.59%
1.983--	877	2.58%
6.03--	778	2.29%
6.5--	754	2.22%
0-3.63-	749	2.20%
5.51--	678	2.00%
3.62--	644	1.90%
6.53--	558	1.64%
5.11--	516	1.52%
0-4.26-	395	1.16%
0-1.87-	377	1.11%
4.22--	365	1.07%
Other	11,668	34.35%
MDaemon (21,410 servers)
Version	Number of Servers	Percent
12.5.6	4,211	19.67%
11.0.3	2,458	11.48%
11.0.0	1,360	6.35%
12.5.4	988	4.61%
10.0.0	865	4.04%
10.1.2	793	3.70%
10.1.1	700	3.27%
12.5.3	619	2.89%
12.0.3	537	2.51%
9.6.1	536	2.50%
9.6.6	495	2.31%
10.1.0	467	2.18%
12.5.2	401	1.87%
12.0.4	384	1.79%
9.5.2	325	1.52%
9.6.2	317	1.48%
10.0.5	311	1.45%
9.6.5	296	1.38%
10.0.2	268	1.25%
9.5.1	261	1.22%
9.5.6	255	1.19%
9.6.4	233	1.09%
8.1.3	220	1.03%
12.0.1	218	1.02%
12.0.0	215	1.00%
Other	3,677	17.17%
IMail (7,929 servers)
Version	Number of Servers	Percent
8.22	1,455	18.35%
11.5	1,061	13.38%
9.23	510	6.43%
8.15	492	6.21%
12.1.0.270	464	5.85%
11.03	427	5.39%
11.01	414	5.22%
8.05	296	3.73%
12.0.0.384	257	3.24%
10.02	247	3.12%
11.0	220	2.77%
7.07	206	2.60%
12.0.0.348	189	2.38%
11.02	169	2.13%
6.06	147	1.85%
8.00	138	1.74%
7.15	134	1.69%
10.01	134	1.69%
9.21	95	1.20%
9.10	85	1.07%
Other	789	9.95%
Lotus Domino (4,817 servers)
Version	Number of Servers	Percent
8.5.3	818	16.98%
8.5.2	387	8.03%
8.5.3FP1	291	6.04%
8.5.2FP2	289	6.00%
8.5.1	244	5.07%
7.0.2	213	4.42%
8.5	169	3.51%
8.5.2FP3	164	3.40%
7.0.3	125	2.59%
8.5.2FP1	113	2.35%
8.5.2FP4	102	2.12%
8.5.1FP5	99	2.06%
8.0.1	97	2.01%
7.0.1	96	1.99%
8.0.2	92	1.91%
8.5.3FP2	91	1.89%
6.5.4	87	1.81%
6.5.1	81	1.68%
7.0	74	1.54%
6.5.3	73	1.52%
8.0	67	1.39%
6.5.5	59	1.22%
8.5.1FP3	55	1.14%
8.5.1FP4	55	1.14%
6.5	54	1.12%
7.0.3FP1	50	1.04%
Other	772	16.03%
WinWebMail (3,618 servers)
Version	Number of Servers	Percent
3.8.1.3	753	20.81%
3.8.0.1	514	14.21%
3.7.6.1	407	11.25%
3.8.1.5	367	10.14%
3.7.3.1	281	7.77%
3.7.7.3	265	7.32%
3.8.1.1	263	7.27%
3.8.2.1	246	6.80%
3.7.1.1	136	3.76%
3.7.5.1	100	2.76%
3.6.3.1	67	1.85%
3.7.7.1	59	1.63%
3.7.0.3	53	1.46%
3.7.0.5	49	1.35%
3.7.0.7	39	1.08%
Other	19	0.53%
CommuniGate Pro (3,293 servers)
Version	Number of Servers	Percent
5.1.16	267	8.11%
5.4.4	167	5.07%
5.4.5	163	4.95%
5.4.6	159	4.83%
4.1.8	142	4.31%
5.2.20	119	3.61%
5.4.1	100	3.04%
5.3.13	96	2.92%
5.4.2	85	2.58%
5.2.16	83	2.52%
4.2.10	78	2.37%
5.1.12	67	2.03%
5.2.3	65	1.97%
5.0.14	65	1.97%
5.4.3	62	1.88%
5.2.19	62	1.88%
5.3.15	62	1.88%
5.4.0	50	1.52%
5.2.14	50	1.52%
5.2.12	46	1.40%
5.3.9	44	1.34%
5.3.8	42	1.28%
5.1.13	40	1.21%
5.4	38	1.15%
5.3.12	38	1.15%
5.3.10	38	1.15%
5.2.13	36	1.09%
5.2.8	33	1.00%
Other	996	30.25%
XMail (2,265 servers)
Version	Number of Servers	Percent
1.27	580	25.61%
1.22	523	23.09%
1.25	403	17.79%
1.26	264	11.66%
1.24	186	8.21%
1.21	87	3.84%
1.23	51	2.25%
1.20	39	1.72%
1.17	36	1.59%
Other	96	4.24%
Kerio (1,793 servers)
Version	Number of Servers	Percent
6.7.3	274	15.28%
6.6.2	184	10.26%
6.7.0	162	9.04%
6.5.0	128	7.14%
6.5.2	124	6.92%
6.4.1	105	5.86%
6.7.2	100	5.58%
6.7.1	87	4.85%
6.3.1	82	4.57%
6.4.0	73	4.07%
6.5.1	67	3.74%
6.6.0	65	3.63%
6.6.1	57	3.18%
6.4.2	38	2.12%
6.3.0	36	2.01%
6.2.0	21	1.17%
6.1.4	18	1.00%
Other	172	9.59%
Qmail Toaster (1,692 servers)
Version	Number of Servers	Percent
1.3	1,606	94.92%
1.2	53	3.13%
1.0	17	1.00%
Other	16	0.95%
Merak (1,354 servers)
Version	Number of Servers	Percent
8.0.3	541	39.96%
8.9.1	146	10.78%
8.5.0	100	7.39%
7.5.2	63	4.65%
8.3.8	58	4.28%
7.6.4	57	4.21%
7.4.5	51	3.77%
9.0.0	26	1.92%
7.4.2	24	1.77%
8.9.0	19	1.40%
7.2.0	18	1.33%
8.2.4	18	1.33%
7.0.1	18	1.33%
7.6.1	18	1.33%
6.2.1	16	1.18%
8.3.15	16	1.18%
4.4.2	14	1.03%
Other	151	11.15%
SurgeSMTP (1,095 servers)
Version	Number of Servers	Percent
5.3h2-2	178	16.26%
6.1c-1	141	12.88%
5.2a-1	120	10.96%
6.0a5-5	72	6.58%
3.9e-1	69	6.30%
6.0a4-4	43	3.93%
3.8k4-4	35	3.20%
4.0u4-4	30	2.74%
5.0e4-4	24	2.19%
4.2d2-2	20	1.83%
4.3g2-2	19	1.74%
3.8i3-3	17	1.55%
5.3h-1	16	1.46%
3.9h-18	15	1.37%
6.0a3-3	14	1.28%
5.0e3-3	13	1.19%
4.2d4-4	12	1.10%
3.7b8-8	12	1.10%
3.6f5-5	12	1.10%
3.9c-1	11	1.00%
4.3g4-4	11	1.00%
Other	211	19.27%
ArGoSoft (848 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	207	24.41%
1.8 (1.8.9.5)	119	14.03%
1.8 (1.8.9.3)	110	12.97%
1.8 (1.8.9.1)	84	9.91%
1.8 (1.8.8.8)	58	6.84%
1.8 (1.8.8.7)	53	6.25%
1.8 (1.8.9.2)	34	4.01%
1.8 (1.8.9.4)	25	2.95%
1.8 (1.8.6.0)	15	1.77%
1.8 (1.8.8.1)	14	1.65%
1.8 (1.8.8.9)	13	1.53%
1.8 (1.8.8.2)	9	1.06%
Other	107	12.62%
GroupWise (563 servers)
Version	Number of Servers	Percent
8.0.2	117	20.78%
7.0.3	107	19.01%
6.5.7	66	11.72%
7.0.4	39	6.93%
7.0.2	39	6.93%
6.5.4	25	4.44%
8.0.1	24	4.26%
6.5.6	22	3.91%
7.0.1	20	3.55%
12.0.0	18	3.20%
6.0.4	17	3.02%
6.5.1	16	2.84%
8.0.0	10	1.78%
7.0	7	1.24%
8.0.3	7	1.24%
6.5.5	7	1.24%
Other	22	3.91%
Post.Office (398 servers)
Version	Number of Servers	Percent
3.5.3	57	14.32%
4.1.0.2	38	9.55%
4.1.2.4	28	7.04%
4.0.1	27	6.78%
4.1.1	18	4.52%
3.9.2.3	17	4.27%
3.5.3J	14	3.52%
3.8.3	13	3.27%
3.9.2	12	3.02%
4.2	12	3.02%
3.1.2	10	2.51%
4.1.0.3	10	2.51%
3.1.2J	10	2.51%
4.0.1.1	9	2.26%
3.8.7.4	9	2.26%
3.6.2	8	2.01%
4.1.0.4	8	2.01%
4.1.2.3	7	1.76%
4.2.1.1	7	1.76%
3.9.1.2	6	1.51%
4.2.1	6	1.51%
4.1.2.2	6	1.51%
3.9.1	6	1.51%
3.9.1.3	5	1.26%
4.0.0.1	5	1.26%
3.9.2.2	4	1.01%
4.1	4	1.01%
3.9.2.1	4	1.01%
3.5.1	4	1.01%
Other	34	8.54%
Trend Micro (394 servers)
Version	Number of Servers	Percent
5.7	154	39.09%
5.5	101	25.63%
5.18	70	17.77%
7.0	37	9.39%
7.1	20	5.08%
Other	12	3.05%
Gordano Messaging Suite (GMS) (358 servers)
Version	Number of Servers	Percent
Other	358	100.00%
MagicMail (321 servers)
Version	Number of Servers	Percent
Other	321	100.00%
Mirapoint (183 servers)
Version	Number of Servers	Percent
3.10.10a-GA	21	11.48%
4.2.3-GA	16	8.74%
4.1.10-GA	14	7.65%
3.10.5-GA	10	5.46%
4.1.9-GA	10	5.46%
3.8.4-GA	10	5.46%
4.1.3-GA	9	4.92%
3.10.8-GA	8	4.37%
3.10.9-GA	8	4.37%
4.3.3-GA	8	4.37%
4.1.4-GA	6	3.28%
3.8.3-GA	6	3.28%
3.10.7-GA	5	2.73%
4.2.4-GA	5	2.73%
3.8.5-GA	4	2.19%
3.8.6-GA	4	2.19%
4.1.8-GA	4	2.19%
3.10.4-GA	3	1.64%
3.8.7a	3	1.64%
3.7.5a-GA	3	1.64%
4.3.4-GA	3	1.64%
4.3.5-GA	3	1.64%
3.10.3-GA	3	1.64%
4.1.5-GA	3	1.64%
3.8.2-GA	2	1.09%
4.3.1a-FCS	2	1.09%
4.0.5a	2	1.09%
Other	8	4.37%
InterScan VirusWall (148 servers)
Version	Number of Servers	Percent
Other	148	100.00%
VisNetic (147 servers)
Version	Number of Servers	Percent
9.3.2.0	42	28.57%
9.1.4.1	20	13.61%
8.5.0.8	10	6.80%
8.0.3.1	7	4.76%
5.8.6.6	7	4.76%
5.5.8.3	7	4.76%
7.6.1.0	6	4.08%
8.0.3	5	3.40%
6.2.2.0	4	2.72%
8.0.3.0	4	2.72%
5.3.5.0	4	2.72%
7.2.4.1	3	2.04%
9.1.4.0	3	2.04%
5.0.2.3	3	2.04%
5.4.5.4	3	2.04%
8.3.5.0	2	1.36%
5.0.2.1	2	1.36%
5.8.6.4	2	1.36%
6.0.9.0	2	1.36%
Other	11	7.48%
Interscan (56 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	13	23.21%
3.81-Build_1022	11	19.64%
3.55 (build 1029)	7	12.50%
3.8-Build_3013	4	7.14%
3.53 (build 2011)	4	7.14%
3.53 (build 1493)	3	5.36%
3.53 (build 2017)	3	5.36%
3.81-Build_1084	3	5.36%
3.53 (build 2013)	2	3.57%
3.81-Build_1055	1	1.79%
3.5 (build 1294)	1	1.79%
3.51 (build 1337)	1	1.79%
3.55 (build 1020)	1	1.79%
3.8-Build_3045	1	1.79%
3.8-Build_1080	1	1.79%
Other	0	0.00%
Mercury (52 servers)
Version	Number of Servers	Percent
1.48	28	53.85%
3.32	15	28.85%
3.01a	2	3.85%
1.47	2	3.85%
3.21	1	1.92%
1.44	1	1.92%
4.x	1	1.92%
3.30	1	1.92%
3.21c	1	1.92%
Other	0	0.00%
NetIQ MailMarshal (44 servers)
Version	Number of Servers	Percent
6.0.3.8	30	68.18%
5.5.6.7	4	9.09%
6.1.3.15	3	6.82%
5.5.6.5	2	4.55%
5.5.6.6	2	4.55%
5.5.5.6	1	2.27%
5.5.4.17	1	2.27%
5.5.4.16	1	2.27%
Other	0	0.00%
WebSTAR V (32 servers)
Version	Number of Servers	Percent
5.4.1	15	46.88%
5.4.0	9	28.12%
5.3.3	3	9.38%
5.3.4	3	9.38%
5.3.2	2	6.25%
Other	0	0.00%
Neon Mail Server (28 servers)
Version	Number of Servers	Percent
3.0.7	8	28.57%
3.1.3	5	17.86%
3.1.0	4	14.29%
3.1.4	3	10.71%
3.1.2	3	10.71%
3.0.9	2	7.14%
3.1.1	1	3.57%
3.1.5	1	3.57%
3.0.6	1	3.57%
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%
OpenSMTPD (22 servers)
Version	Number of Servers	Percent
Other	22	100.00%
OpenVMS (17 servers)
Version	Number of Servers	Percent
8.3	8	47.06%
7.3	4	23.53%
8.4	3	17.65%
6.1	1	5.88%
8.2	1	5.88%
Other	0	0.00%
WebSTAR (14 servers)
Version	Number of Servers	Percent
Other	14	100.00%
ModusMail (14 servers)
Version	Number of Servers	Percent
4.35.477.0	6	42.86%
4.35.480.0	2	14.29%
4.1.361.21	1	7.14%
3.2.315.0	1	7.14%
4.0.340.3	1	7.14%
4.3.459.0	1	7.14%
4.35.477.8	1	7.14%
3.1.302.0	1	7.14%
Other	0	0.00%
MAILsweeper (6 servers)
Version	Number of Servers	Percent
4.3.17.0	3	50.00%
4.3.19.0	2	33.33%
4.3.20.0	1	16.67%
Other	0	0.00%