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	2,413,953	100.0%
Number of Servers that didn't respond	439,230	18.20%
Server didn't open socket	426,321	17.66%
Server didn't provide banner	12,909	0.53%
Server provided banner	1,974,723	81.80%
Server banner identifies software in use	1,136,935	47.10%

As indicated by the above table, of the 2,413,953 servers queried, only 1,136,935 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	601,962	52.95%
Postfix	356,388	31.35%
Sendmail	82,406	7.25%
Microsoft	30,483	2.68%
MailEnable	29,722	2.61%
MDaemon	17,971	1.58%
IMail	4,097	0.36%
CommuniGate Pro	2,550	0.22%
Lotus Domino	2,348	0.21%
WinWebMail	1,928	0.17%
XMail	1,608	0.14%
Qmail Toaster	1,236	0.11%
Kerio	850	0.07%
SurgeSMTP	846	0.07%
Merak	563	0.05%
ArGoSoft	395	0.03%
MagicMail	271	0.02%
Post.Office	240	0.02%
OpenSMTPD	222	0.02%
Gordano Messaging Suite (GMS)	213	0.02%
GroupWise	212	0.02%
Trend Micro	142	0.01%
InterScan VirusWall	70	0.01%
Mirapoint	54	0.00%
VisNetic	49	0.00%
Mercury	25	0.00%
OpenVMS	18	0.00%
Interscan	14	0.00%
WebSTAR V	14	0.00%
ModusMail	11	0.00%
Neon Mail Server	10	0.00%
MessageWall	7	0.00%
NetIQ MailMarshal	5	0.00%
WebSTAR	3	0.00%
MAILsweeper	2	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (601,962 servers)
Version	Number of Servers	Percent
4.85	362,672	60.25%
4.82	73,270	12.17%
4.84	68,103	11.31%
4.80	20,442	3.40%
4.80.1	19,650	3.26%
4.72	17,122	2.84%
4.76	16,287	2.71%
4.69	7,176	1.19%
Other	17,240	2.86%
Postfix (356,388 servers)
Version	Number of Servers	Percent
Other	356,388	100.00%
Sendmail (82,406 servers)
Version	Number of Servers	Percent
8.14.5	17,873	21.69%
8.13.8	17,313	21.01%
8.14.4	14,907	18.09%
8.13.1	10,162	12.33%
8.14.3	5,707	6.93%
8.12.11.20060308	2,020	2.45%
8.14.7	1,845	2.24%
8.14.9	1,710	2.08%
8.13.6.20060614	1,352	1.64%
8.14.2	1,071	1.30%
8.11.6	926	1.12%
8.12.10	892	1.08%
Other	6,628	8.04%
Microsoft (30,483 servers)
Version	Number of Servers	Percent
6.0.3790.4675	22,597	74.13%
6.0.3790.3959	2,425	7.96%
7.5.7601.17514	2,350	7.71%
6.0.3790.1830	695	2.28%
7.0.6002.18264	436	1.43%
8.5.9600.16384	393	1.29%
5.0.2195.7381	325	1.07%
Other	1,262	4.14%
MailEnable (29,722 servers)
Version	Number of Servers	Percent
1.986--	2,053	6.91%
6.5--	2,018	6.79%
8.60--	1,552	5.22%
8.53--	1,465	4.93%
8.51--	1,055	3.55%
5.10--	1,043	3.51%
8.04--	883	2.97%
8.60-8.60-	877	2.95%
8.50--	790	2.66%
4.26--	768	2.58%
8.60--8.60	753	2.53%
6.0--	743	2.50%
8.00--	699	2.35%
7.06--	657	2.21%
7.07--	437	1.47%
8.55--	436	1.47%
7.50--	408	1.37%
7.0--	408	1.37%
6.88-6.88-	399	1.34%
1.981--	397	1.34%
6.70--	377	1.27%
6.57--	376	1.27%
7.53--	349	1.17%
Other	10,779	36.27%
MDaemon (17,971 servers)
Version	Number of Servers	Percent
15.0.1	2,427	13.51%
11.0.3	972	5.41%
13.5.1	857	4.77%
11.0.0	854	4.75%
13.0.4	836	4.65%
14.5.3	803	4.47%
15.0.0	761	4.23%
13.0.5	720	4.01%
14.5.2	687	3.82%
14.0.3	569	3.17%
12.5.6	438	2.44%
10.0.0	415	2.31%
14.0.2	389	2.16%
10.1.2	334	1.86%
12.5.4	319	1.78%
10.1.1	292	1.62%
13.6.2	265	1.47%
10.1.0	234	1.30%
13.6.0	231	1.29%
9.6.1	222	1.24%
9.6.2	217	1.21%
14.5.0	211	1.17%
13.0.2	209	1.16%
9.6.6	202	1.12%
13.0.3	191	1.06%
13.6.3	186	1.04%
13.5.2	186	1.04%
Other	3,944	21.95%
IMail (4,097 servers)
Version	Number of Servers	Percent
8.22	450	10.98%
12.3.0.100	375	9.15%
12.4.2.27	331	8.08%
9.23	260	6.35%
12.5.2.62	256	6.25%
12.5.1.60	252	6.15%
12.4.1.15	227	5.54%
8.15	209	5.10%
8.05	169	4.12%
12.2.0.235	135	3.30%
11.5	128	3.12%
11.03	114	2.78%
12.5.0.246	109	2.66%
12.4.0.166	79	1.93%
11.02	68	1.66%
10.02	67	1.64%
11.01	66	1.61%
7.15	64	1.56%
12.4.1.9	61	1.49%
7.07	60	1.46%
8.00	51	1.24%
12.1.0.270	49	1.20%
6.06	41	1.00%
Other	476	11.62%
CommuniGate Pro (2,550 servers)
Version	Number of Servers	Percent
5.1.16	260	10.20%
6.1.2	198	7.76%
6.0.9	172	6.75%
6.0.11	137	5.37%
5.2.20	93	3.65%
6.0.10	87	3.41%
5.4.11	85	3.33%
6.0.7	68	2.67%
6.0.8	58	2.27%
5.3.15	56	2.20%
5.3.13	54	2.12%
5.2.3	51	2.00%
5.0.14	50	1.96%
4.1.8	49	1.92%
6.0.5	48	1.88%
6.1.1	46	1.80%
5.1.12	39	1.53%
4.2.10	32	1.25%
5.2.16	31	1.22%
5.4.6	31	1.22%
5.4.4	31	1.22%
5.4.8	30	1.18%
5.4.10	29	1.14%
5.2.19	28	1.10%
6.0.1	26	1.02%
5.4.1	26	1.02%
Other	735	28.82%
Lotus Domino (2,348 servers)
Version	Number of Servers	Percent
8.5.3	334	14.22%
8.5.3FP6	298	12.69%
8.5.2	115	4.90%
8.5.1	93	3.96%
8.5.3FP3	86	3.66%
7.0.2	85	3.62%
8.5.3FP2	70	2.98%
8.5.2FP4	70	2.98%
8.5	65	2.77%
8.5.3FP4	62	2.64%
8.5.3FP1	58	2.47%
8.5.2FP2	58	2.47%
8.5.2FP3	58	2.47%
8.5.3FP5	56	2.39%
7.0.3	46	1.96%
7.0	39	1.66%
8.5.1FP5	38	1.62%
8.0.1	38	1.62%
7.0.1	34	1.45%
8.0	33	1.41%
6.5.1	32	1.36%
8.5.2FP1	31	1.32%
6.5.4	28	1.19%
8.0.2	28	1.19%
6.5.3	26	1.11%
7.0.4	24	1.02%
Other	443	18.87%
WinWebMail (1,928 servers)
Version	Number of Servers	Percent
3.8.1.3	329	17.06%
3.9.0.7	273	14.16%
3.7.6.1	164	8.51%
3.8.0.1	159	8.25%
3.9.0.1	132	6.85%
3.8.1.5	111	5.76%
3.8.1.1	99	5.13%
3.7.3.1	97	5.03%
3.8.5.1	93	4.82%
3.8.6.1	79	4.10%
3.7.7.3	75	3.89%
3.7.1.1	54	2.80%
3.8.2.1	50	2.59%
3.8.3.1	30	1.56%
3.7.5.1	28	1.45%
3.8.3.3	23	1.19%
3.9.0.5	23	1.19%
3.7.0.5	21	1.09%
Other	88	4.56%
XMail (1,608 servers)
Version	Number of Servers	Percent
1.27	614	38.18%
1.22	464	28.86%
1.25	193	12.00%
1.26	134	8.33%
1.24	69	4.29%
1.21	35	2.18%
1.23	23	1.43%
1.20	19	1.18%
Other	57	3.54%
Qmail Toaster (1,236 servers)
Version	Number of Servers	Percent
1.3	1,166	94.34%
1.2	24	1.94%
1.03.5	15	1.21%
Other	31	2.51%
Kerio (850 servers)
Version	Number of Servers	Percent
6.7.3	183	21.53%
6.7.0	87	10.24%
6.6.2	76	8.94%
6.5.2	57	6.71%
6.5.0	55	6.47%
6.7.2	51	6.00%
6.4.1	47	5.53%
6.7.1	37	4.35%
6.3.1	36	4.24%
6.6.1	35	4.12%
6.5.1	29	3.41%
6.3.0	21	2.47%
6.4.0	19	2.24%
6.4.2	18	2.12%
6.6.0	14	1.65%
6.2.0	11	1.29%
Other	74	8.71%
SurgeSMTP (846 servers)
Version	Number of Servers	Percent
6.9c-1	186	21.99%
6.5a2-2	119	14.07%
6.7c-1	105	12.41%
6.5a-1	58	6.86%
6.3c2-2	34	4.02%
5.3h2-2	25	2.96%
6.4a-1	25	2.96%
3.9e-1	25	2.96%
5.2a-1	23	2.72%
3.8k4-4	19	2.25%
6.9d-16	16	1.89%
6.1c-1	14	1.65%
4.0u4-4	11	1.30%
6.9d-19	10	1.18%
Other	176	20.80%
Merak (563 servers)
Version	Number of Servers	Percent
8.0.3	185	32.86%
8.9.1	76	13.50%
8.5.0	44	7.82%
7.5.2	30	5.33%
8.3.8	28	4.97%
7.4.5	28	4.97%
7.6.4	23	4.09%
7.6.1	14	2.49%
7.0.1	12	2.13%
8.3.15	11	1.95%
7.4.2	10	1.78%
7.2.0	8	1.42%
8.9.0	7	1.24%
8.2.4	7	1.24%
9.0.0	7	1.24%
Other	73	12.97%
ArGoSoft (395 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	114	28.86%
1.8 (1.8.9.3)	55	13.92%
1.8 (1.8.9.5)	55	13.92%
1.8 (1.8.9.1)	35	8.86%
1.8 (1.8.8.7)	23	5.82%
1.8 (1.8.8.8)	21	5.32%
1.8 (1.8.9.2)	12	3.04%
1.8 (1.8.9.4)	10	2.53%
1.8 (1.8.6.0)	8	2.03%
1.8 (1.8.7.3)	7	1.77%
1.8 (1.8.8.9)	5	1.27%
1.8 (1.8.8.2)	4	1.01%
1.8 (1.8.8.4)	4	1.01%
Other	42	10.63%
MagicMail (271 servers)
Version	Number of Servers	Percent
Other	271	100.00%
Post.Office (240 servers)
Version	Number of Servers	Percent
4.2.2	45	18.75%
3.5.3	33	13.75%
4.1.2.4	30	12.50%
4.3	14	5.83%
4.1.0.2	14	5.83%
4.2.1.3	10	4.17%
4.0.1	9	3.75%
4.1.1	9	3.75%
3.9.2.3	8	3.33%
3.1.2J	6	2.50%
3.5.3J	5	2.08%
4.2	5	2.08%
4.1.0.3	5	2.08%
4.2.1.1	5	2.08%
4.1.2.3	4	1.67%
3.8.7.4	4	1.67%
3.9.2	3	1.25%
3.1.2	3	1.25%
3.5.1	3	1.25%
3.9.1	3	1.25%
Other	22	9.17%
OpenSMTPD (222 servers)
Version	Number of Servers	Percent
Other	222	100.00%
Gordano Messaging Suite (GMS) (213 servers)
Version	Number of Servers	Percent
Other	213	100.00%
GroupWise (212 servers)
Version	Number of Servers	Percent
14.0.1	40	18.87%
7.0.3	22	10.38%
6.5.7	20	9.43%
8.0.3	18	8.49%
8.0.2	17	8.02%
7.0.2	12	5.66%
7.0.4	12	5.66%
14.0.0	11	5.19%
12.0.2	9	4.25%
12.0.3	6	2.83%
6.5.6	6	2.83%
7.0.1	5	2.36%
6.5.4	5	2.36%
6.0.4	5	2.36%
14.0.2	4	1.89%
8.0.0	3	1.42%
6.5.5	3	1.42%
Other	14	6.60%
Trend Micro (142 servers)
Version	Number of Servers	Percent
5.7	55	38.73%
5.5	27	19.01%
5.18	24	16.90%
7.0	12	8.45%
7.1	11	7.75%
8.5	4	2.82%
3.53	3	2.11%
7.5	2	1.41%
Other	4	2.82%
InterScan VirusWall (70 servers)
Version	Number of Servers	Percent
Other	70	100.00%
Mirapoint (54 servers)
Version	Number of Servers	Percent
4.3.5-GA	8	14.81%
4.4.3-GA	5	9.26%
4.3.6-GA	5	9.26%
4.4.2a-FCS	4	7.41%
4.4.5-GA	4	7.41%
4.1.10-GA	4	7.41%
4.4.4-GA	3	5.56%
4.3.3-GA	2	3.70%
3.10.10a-GA	2	3.70%
4.4.5a-GA	2	3.70%
4.4.6-GA	2	3.70%
4.3.7-GA	2	3.70%
4.1.5-GA	2	3.70%
4.1.9-GA	1	1.85%
3.10.4-GA	1	1.85%
4.1.6-GA	1	1.85%
3.7.5a-GA	1	1.85%
3.8.7a	1	1.85%
3.7.3a-GA	1	1.85%
3.8.4-GA	1	1.85%
3.10.2-GA	1	1.85%
3.8.5-GA	1	1.85%
Other	0	0.00%
VisNetic (49 servers)
Version	Number of Servers	Percent
9.3.2.0	10	20.41%
9.1.4.1	6	12.24%
6.2.2.0	4	8.16%
8.5.0.8	4	8.16%
5.0.2.3	3	6.12%
5.8.6.6	3	6.12%
9.1.4.0	2	4.08%
7.2.4.1	2	4.08%
7.6.1.0	2	4.08%
5.5.8.3	2	4.08%
5.3.5.0	2	4.08%
8.0.3	1	2.04%
8.3.0.1	1	2.04%
8.5.0.5	1	2.04%
5.4.5.4	1	2.04%
8.0.3.1	1	2.04%
5.4.5	1	2.04%
5.0.2.0	1	2.04%
7.2.4.0	1	2.04%
9.1.4.1 provided by Techfount Systems Pte Ltd	1	2.04%
Other	0	0.00%
Mercury (25 servers)
Version	Number of Servers	Percent
1.48	12	48.00%
3.32	11	44.00%
3.21	1	4.00%
4.x	1	4.00%
Other	0	0.00%
OpenVMS (18 servers)
Version	Number of Servers	Percent
8.3	8	44.44%
7.3	6	33.33%
8.4	4	22.22%
Other	0	0.00%
Interscan (14 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	3	21.43%
3.81-Build_1084	2	14.29%
3.81-Build_1022	2	14.29%
3.55 (build 1029)	2	14.29%
3.5 (build 1294)	1	7.14%
3.8-Build_3013	1	7.14%
3.53 (build 2013)	1	7.14%
3.53 (build 2017)	1	7.14%
3.8-Build_1080	1	7.14%
Other	0	0.00%
WebSTAR V (14 servers)
Version	Number of Servers	Percent
5.4.1	6	42.86%
5.4.0	4	28.57%
5.3.4	2	14.29%
5.3.3	1	7.14%
5.3.2	1	7.14%
Other	0	0.00%
ModusMail (11 servers)
Version	Number of Servers	Percent
4.35.477.0	7	63.64%
4.1.361.21	1	9.09%
3.2.315.0	1	9.09%
4.35.477.8	1	9.09%
3.1.302.0	1	9.09%
Other	0	0.00%
Neon Mail Server (10 servers)
Version	Number of Servers	Percent
3.0.7	4	40.00%
3.1.4	2	20.00%
3.1.0	2	20.00%
3.1.2	1	10.00%
3.1.3	1	10.00%
Other	0	0.00%
MessageWall (7 servers)
Version	Number of Servers	Percent
1.0.8	7	100.00%
Other	0	0.00%
NetIQ MailMarshal (5 servers)
Version	Number of Servers	Percent
5.5.6.5	2	40.00%
6.0.3.8	1	20.00%
5.5.4.17	1	20.00%
5.5.6.7	1	20.00%
Other	0	0.00%
WebSTAR (3 servers)
Version	Number of Servers	Percent
Other	3	100.00%
MAILsweeper (2 servers)
Version	Number of Servers	Percent
4.3.17.0	1	50.00%
4.3.20.0	1	50.00%
Other	0	0.00%