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	2,269,287	100.0%
Number of Servers that didn't respond	372,721	16.42%
Server didn't open socket	360,370	15.88%
Server didn't provide banner	12,351	0.54%
Server provided banner	1,896,566	83.58%
Server banner identifies software in use	1,032,577	45.50%

As indicated by the above table, of the 2,269,287 servers queried, only 1,032,577 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	419,911	40.67%
Postfix	234,940	22.75%
Microsoft	145,144	14.06%
Sendmail	138,243	13.39%
MailEnable	33,089	3.20%
MDaemon	22,057	2.14%
IMail	10,662	1.03%
Lotus Domino	5,115	0.50%
WinWebMail	4,413	0.43%
CommuniGate Pro	3,573	0.35%
Kerio	2,692	0.26%
XMail	2,482	0.24%
Merak	1,968	0.19%
Qmail Toaster	1,778	0.17%
SurgeSMTP	1,273	0.12%
ArGoSoft	1,134	0.11%
GroupWise	979	0.09%
Trend Micro	602	0.06%
Gordano Messaging Suite (GMS)	488	0.05%
Post.Office	479	0.05%
MagicMail	379	0.04%
Mirapoint	269	0.03%
VisNetic	233	0.02%
InterScan VirusWall	207	0.02%
NetIQ MailMarshal	99	0.01%
Interscan	82	0.01%
Mercury	77	0.01%
WebSTAR V	50	0.00%
Neon Mail Server	50	0.00%
OpenVMS	25	0.00%
MessageWall	24	0.00%
WebSTAR	22	0.00%
ModusMail	20	0.00%
MAILsweeper	11	0.00%
OpenSMTPD	7	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (419,911 servers)
Version	Number of Servers	Percent
4.69	355,698	84.71%
4.72	20,503	4.88%
4.67	10,952	2.61%
4.76	8,554	2.04%
4.63	6,146	1.46%
4.71	4,386	1.04%
Other	13,672	3.26%
Postfix (234,940 servers)
Version	Number of Servers	Percent
Other	234,940	100.00%
Microsoft (145,144 servers)
Version	Number of Servers	Percent
6.0.3790.4675	108,524	74.77%
6.0.3790.3959	23,699	16.33%
6.0.3790.1830	6,455	4.45%
5.0.2195.7381	1,930	1.33%
Other	4,536	3.13%
Sendmail (138,243 servers)
Version	Number of Servers	Percent
8.13.8	31,653	22.90%
8.13.1	24,337	17.60%
8.14.3	18,780	13.58%
8.14.4	18,454	13.35%
8.12.11.20060308	6,591	4.77%
8.13.6.20060614	4,984	3.61%
8.14.2	4,055	2.93%
8.11.6	3,633	2.63%
8.12.10	3,588	2.60%
8.13.6	3,102	2.24%
8.14.1	2,919	2.11%
8.12.11.20060614	2,682	1.94%
8.13.7	2,125	1.54%
8.12.11	2,105	1.52%
8.13.4	2,031	1.47%
8.12.8	1,733	1.25%
Other	5,471	3.96%
MailEnable (33,089 servers)
Version	Number of Servers	Percent
1.986--	10,570	31.94%
4.26--	2,499	7.55%
1.981--	2,307	6.97%
1.983--	1,450	4.38%
3.62--	974	2.94%
0-3.63-	922	2.79%
5.10--	650	1.96%
0-4.26-	601	1.82%
4.22--	574	1.73%
4.23--	531	1.60%
0-1.87-	436	1.32%
0-2.53-	424	1.28%
1.95--	412	1.25%
1.96--	411	1.24%
4.14--	383	1.16%
--3.63	381	1.15%
5.11--	359	1.08%
0-5.10-	343	1.04%
Other	8,862	26.78%
MDaemon (22,057 servers)
Version	Number of Servers	Percent
11.0.3	3,741	16.96%
12.0.3	2,320	10.52%
11.0.0	1,184	5.37%
10.1.2	1,179	5.35%
10.0.0	1,088	4.93%
12.0.1	949	4.30%
10.1.1	904	4.10%
12.0.2	750	3.40%
9.6.1	695	3.15%
9.6.6	626	2.84%
12.0.0	547	2.48%
10.1.0	541	2.45%
10.0.5	430	1.95%
9.5.2	428	1.94%
9.6.5	428	1.94%
10.0.2	389	1.76%
9.5.6	359	1.63%
9.6.2	359	1.63%
9.5.1	349	1.58%
9.6.4	342	1.55%
10.0.4	328	1.49%
8.1.3	306	1.39%
9.0.4	287	1.30%
11.0.2	276	1.25%
Other	3,252	14.74%
IMail (10,662 servers)
Version	Number of Servers	Percent
8.22	2,037	19.11%
8.15	773	7.25%
11.03	760	7.13%
11.02	748	7.02%
9.23	714	6.70%
11.5	549	5.15%
11.01	527	4.94%
8.05	490	4.60%
9.10	437	4.10%
10.02	394	3.70%
9.20	385	3.61%
11.0	323	3.03%
7.07	281	2.64%
9.21	270	2.53%
7.15	247	2.32%
8.00	210	1.97%
6.06	204	1.91%
10.01	155	1.45%
8.04	141	1.32%
Other	1,017	9.54%
Lotus Domino (5,115 servers)
Version	Number of Servers	Percent
8.5.2	587	11.48%
8.5.2FP2	438	8.56%
8.5.1	410	8.02%
8.5.2FP1	316	6.18%
7.0.2	297	5.81%
8.5	277	5.42%
7.0.3	170	3.32%
8.0.2	142	2.78%
8.0.1	140	2.74%
7.0.1	136	2.66%
6.5.4	135	2.64%
8.5.1FP3	131	2.56%
6.5.1	121	2.37%
6.5.3	112	2.19%
8.5.1FP5	101	1.97%
8.0	98	1.92%
7.0	91	1.78%
6.5.5	87	1.70%
7.0.3FP1	81	1.58%
7.0.2FP2	80	1.56%
8.5.1FP2	78	1.52%
8.5.1FP4	75	1.47%
6.5	67	1.31%
8.5FP1	53	1.04%
Other	892	17.44%
WinWebMail (4,413 servers)
Version	Number of Servers	Percent
3.8.0.1	879	19.92%
3.8.1.3	778	17.63%
3.7.6.1	633	14.34%
3.7.3.1	444	10.06%
3.7.7.3	438	9.93%
3.8.1.1	398	9.02%
3.7.1.1	205	4.65%
3.7.5.1	156	3.54%
3.7.7.1	116	2.63%
3.6.3.1	106	2.40%
3.7.0.5	89	2.02%
3.7.0.3	78	1.77%
3.7.0.7	64	1.45%
Other	29	0.66%
CommuniGate Pro (3,573 servers)
Version	Number of Servers	Percent
5.1.16	261	7.30%
5.3.13	237	6.63%
4.1.8	189	5.29%
5.4	124	3.47%
5.3.8	120	3.36%
5.2.16	112	3.13%
5.2.20	108	3.02%
4.2.10	102	2.85%
5.3.12	97	2.71%
5.3.10	92	2.57%
5.2.19	84	2.35%
5.1.12	78	2.18%
5.3.9	77	2.16%
5.0.14	75	2.10%
5.3.11	74	2.07%
5.2.3	69	1.93%
5.2.14	67	1.88%
5.2.12	66	1.85%
5.2.8	58	1.62%
5.1.13	54	1.51%
5.4.0	52	1.46%
5.3.7	50	1.40%
5.2.13	47	1.32%
5.3.2	43	1.20%
5.2.10	42	1.18%
5.1.14	40	1.12%
5.2.18	39	1.09%
5.3.5	38	1.06%
5.2.0	37	1.04%
Other	1,041	29.14%
Kerio (2,692 servers)
Version	Number of Servers	Percent
6.7.3	353	13.11%
6.6.2	297	11.03%
6.7.0	247	9.18%
6.7.2	194	7.21%
6.5.0	192	7.13%
6.5.2	168	6.24%
6.3.1	141	5.24%
6.4.1	140	5.20%
6.7.1	139	5.16%
6.4.0	106	3.94%
6.6.0	100	3.71%
6.5.1	89	3.31%
6.6.1	69	2.56%
6.4.2	62	2.30%
6.3.0	52	1.93%
6.2.2	36	1.34%
6.2.0	29	1.08%
6.1.3	28	1.04%
6.1.2	27	1.00%
6.0.10	27	1.00%
6.1.4	27	1.00%
Other	169	6.28%
XMail (2,482 servers)
Version	Number of Servers	Percent
1.22	593	23.89%
1.25	517	20.83%
1.27	348	14.02%
1.26	324	13.05%
1.24	276	11.12%
1.21	108	4.35%
1.23	71	2.86%
1.20	59	2.38%
1.17	46	1.85%
1.12	39	1.57%
Other	101	4.07%
Merak (1,968 servers)
Version	Number of Servers	Percent
8.0.3	809	41.11%
8.9.1	192	9.76%
8.5.0	134	6.81%
7.5.2	93	4.73%
7.6.4	83	4.22%
8.3.8	76	3.86%
7.4.5	75	3.81%
8.2.13	46	2.34%
9.0.0	33	1.68%
7.4.2	30	1.52%
8.2.4	26	1.32%
7.2.0	24	1.22%
7.6.1	24	1.22%
8.3.15	24	1.22%
8.9.0	21	1.07%
7.0.1	20	1.02%
Other	258	13.11%
Qmail Toaster (1,778 servers)
Version	Number of Servers	Percent
1.3	1,662	93.48%
1.2	83	4.67%
1.0	22	1.24%
Other	11	0.62%
SurgeSMTP (1,273 servers)
Version	Number of Servers	Percent
5.2a-1	410	32.21%
3.9e-1	110	8.64%
4.2d4-4	90	7.07%
5.0e4-4	58	4.56%
3.8k4-4	52	4.08%
4.0u4-4	45	3.53%
4.2d2-2	30	2.36%
5.0e3-3	26	2.04%
3.8i3-3	26	2.04%
4.3g4-4	25	1.96%
5.1c2-2	25	1.96%
4.3g2-2	22	1.73%
5.3f-1	20	1.57%
3.7b8-8	18	1.41%
4.3e-1	18	1.41%
3.9c-1	16	1.26%
3.6f5-5	16	1.26%
5.1c-1	16	1.26%
3.9h-18	15	1.18%
4.2a3-3	15	1.18%
5.3b2-2	14	1.10%
3.8f2-2	13	1.02%
Other	193	15.16%
ArGoSoft (1,134 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	250	22.05%
1.8 (1.8.9.5)	174	15.34%
1.8 (1.8.9.3)	141	12.43%
1.8 (1.8.9.1)	105	9.26%
1.8 (1.8.8.8)	86	7.58%
1.8 (1.8.8.7)	65	5.73%
1.8 (1.8.9.2)	47	4.14%
1.8 (1.8.9.4)	29	2.56%
1.8 (1.8.8.1)	20	1.76%
1.8 (1.8.6.0)	18	1.59%
1.8 (1.8.8.9)	18	1.59%
1.8 (1.8.9.0)	16	1.41%
1.8 (1.8.8.2)	13	1.15%
Other	152	13.40%
GroupWise (979 servers)
Version	Number of Servers	Percent
7.0.3	240	24.51%
8.0.2	176	17.98%
6.5.7	110	11.24%
7.0.2	82	8.38%
8.0.1	67	6.84%
7.0.4	54	5.52%
7.0.1	40	4.09%
6.5.4	39	3.98%
6.5.6	31	3.17%
6.0.4	26	2.66%
8.0.0	24	2.45%
6.5.1	24	2.45%
6.5.5	16	1.63%
7.0	12	1.23%
Other	38	3.88%
Trend Micro (602 servers)
Version	Number of Servers	Percent
5.7	247	41.03%
5.5	160	26.58%
5.18	109	18.11%
7.0	54	8.97%
7.1	16	2.66%
Other	16	2.66%
Gordano Messaging Suite (GMS) (488 servers)
Version	Number of Servers	Percent
Other	488	100.00%
Post.Office (479 servers)
Version	Number of Servers	Percent
3.5.3	79	16.49%
4.1.0.2	56	11.69%
4.0.1	42	8.77%
4.1.2.4	26	5.43%
3.5.3J	22	4.59%
4.1.1	22	4.59%
3.8.3	19	3.97%
3.9.2.3	15	3.13%
3.9.2	13	2.71%
3.9.1	12	2.51%
4.1.0.3	10	2.09%
4.0.1.1	10	2.09%
3.1.2J	10	2.09%
3.8.7.4	10	2.09%
3.1.2	9	1.88%
4.1	9	1.88%
4.1.0.4	9	1.88%
3.6.2	9	1.88%
3.9.2.1	8	1.67%
4.1.2.3	7	1.46%
4.0.0.2	7	1.46%
3.9.1.3	6	1.25%
4.0.0.1	6	1.25%
3.5.2	6	1.25%
4.1.2.2	6	1.25%
3.9.1.2	5	1.04%
3.6.3	5	1.04%
Other	41	8.56%
MagicMail (379 servers)
Version	Number of Servers	Percent
Other	379	100.00%
Mirapoint (269 servers)
Version	Number of Servers	Percent
3.8.4-GA	25	9.29%
3.10.5-GA	23	8.55%
3.10.10a-GA	20	7.43%
3.10.8-GA	19	7.06%
3.8.3-GA	18	6.69%
4.2.3-GA	16	5.95%
3.10.9-GA	15	5.58%
4.1.3-GA	13	4.83%
4.1.10-GA	13	4.83%
3.10.7-GA	11	4.09%
4.1.9-GA	10	3.72%
4.1.8-GA	10	3.72%
3.10.4-GA	8	2.97%
3.10.6-GA	7	2.60%
3.10.3-GA	7	2.60%
3.8.2-GA	6	2.23%
4.1.4-GA	6	2.23%
3.8.6-GA	6	2.23%
3.8.7a	6	2.23%
3.8.5-GA	5	1.86%
3.7.3a-GA	5	1.86%
3.7.5a-GA	3	1.12%
4.1.5-GA	3	1.12%
4.3.1a-FCS	3	1.12%
Other	11	4.09%
VisNetic (233 servers)
Version	Number of Servers	Percent
9.3.2.0	81	34.76%
9.1.4.1	32	13.73%
5.8.6.6	17	7.30%
8.5.0.8	11	4.72%
5.5.8.3	10	4.29%
8.0.3.1	7	3.00%
8.0.3.0	7	3.00%
7.6.1.0	7	3.00%
8.3.5.0	5	2.15%
5.3.5.0	5	2.15%
8.0.3	5	2.15%
5.0.2.3	5	2.15%
5.0.2.1	4	1.72%
6.2.2.0	4	1.72%
9.1.4.0	4	1.72%
7.2.4.1	3	1.29%
7.2.4.0	3	1.29%
5.4.5.4	3	1.29%
Other	20	8.58%
InterScan VirusWall (207 servers)
Version	Number of Servers	Percent
Other	207	100.00%
NetIQ MailMarshal (99 servers)
Version	Number of Servers	Percent
6.0.3.8	70	70.71%
6.1.3.15	7	7.07%
5.5.6.7	7	7.07%
5.5.4.16	5	5.05%
5.5.6.6	3	3.03%
5.5.3.17	2	2.02%
6.5.4.7535	1	1.01%
5.5.5.8	1	1.01%
5.5.4.17	1	1.01%
5.5.6.5	1	1.01%
5.5.5.6	1	1.01%
Other	0	0.00%
Interscan (82 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	17	20.73%
3.81-Build_1022	12	14.63%
3.55 (build 1029)	9	10.98%
3.53 (build 2017)	8	9.76%
3.81-Build_1084	6	7.32%
3.8-Build_3013	5	6.10%
3.52 (build 1375)	4	4.88%
3.53 (build 1493)	3	3.66%
3.53 (build 2011)	3	3.66%
3.55 (build 1020)	3	3.66%
3.53 (build 2013)	2	2.44%
3.8-Build_1080	2	2.44%
3.53 (build 1494)	1	1.22%
3.81-Build_1055	1	1.22%
3.51 (build 1321)	1	1.22%
3.55 (build 2003)	1	1.22%
3.6-Build_1246	1	1.22%
3.81-Build_1032	1	1.22%
3.8-Build_3045	1	1.22%
3.6-Build_1207	1	1.22%
Other	0	0.00%
Mercury (77 servers)
Version	Number of Servers	Percent
1.48	43	55.84%
3.32	19	24.68%
3.21c	4	5.19%
3.21	2	2.60%
3.01a	2	2.60%
1.47	2	2.60%
3.30	2	2.60%
1.44	1	1.30%
3.31	1	1.30%
1.49	1	1.30%
Other	0	0.00%
WebSTAR V (50 servers)
Version	Number of Servers	Percent
5.4.1	20	40.00%
5.4.0	11	22.00%
5.3.4	6	12.00%
5.3.3	5	10.00%
5.3.2	5	10.00%
5.3.1	2	4.00%
5.3.0	1	2.00%
Other	0	0.00%
Neon Mail Server (50 servers)
Version	Number of Servers	Percent
3.1.3	12	24.00%
3.0.7	11	22.00%
3.0.9	6	12.00%
3.1.0	5	10.00%
3.1.2	5	10.00%
3.1.4	4	8.00%
3.0.6	2	4.00%
3.1.1	2	4.00%
3.1.5	2	4.00%
3.0.8	1	2.00%
Other	0	0.00%
OpenVMS (25 servers)
Version	Number of Servers	Percent
8.3	13	52.00%
7.3	8	32.00%
8.4	2	8.00%
6.1	1	4.00%
8.2	1	4.00%
Other	0	0.00%
MessageWall (24 servers)
Version	Number of Servers	Percent
1.0.8	23	95.83%
1.0.6	1	4.17%
Other	0	0.00%
WebSTAR (22 servers)
Version	Number of Servers	Percent
Other	22	100.00%
ModusMail (20 servers)
Version	Number of Servers	Percent
4.35.477.0	7	35.00%
4.35.480.0	3	15.00%
4.1.361.21	2	10.00%
4.2.425.22	1	5.00%
3.2.315.0	1	5.00%
4.0.340.3	1	5.00%
3.1.293.1	1	5.00%
4.3.459.0	1	5.00%
4.35.477.8	1	5.00%
3.1.302.0	1	5.00%
4.35.480.11	1	5.00%
Other	0	0.00%
MAILsweeper (11 servers)
Version	Number of Servers	Percent
4.3.17.0	3	27.27%
4.3.20.0	2	18.18%
4.3.19.0	2	18.18%
4.3.14.0	2	18.18%
4.3.1.0	1	9.09%
4.3.6.0	1	9.09%
Other	0	0.00%
OpenSMTPD (7 servers)
Version	Number of Servers	Percent
Other	7	100.00%