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	2,010,308	100.0%
Number of Servers that didn't respond	360,591	17.94%
Server didn't open socket	351,094	17.46%
Server didn't provide banner	9,497	0.47%
Server provided banner	1,649,717	82.06%
Server banner identifies software in use	1,013,597	50.42%

As indicated by the above table, of the 2,010,308 servers queried, only 1,013,597 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	572,684	56.50%
Postfix	339,752	33.52%
Sendmail	47,478	4.68%
MailEnable	23,007	2.27%
MDaemon	11,507	1.14%
Microsoft	9,351	0.92%
IMail	2,086	0.21%
CommuniGate Pro	1,793	0.18%
XMail	1,031	0.10%
WinWebMail	1,008	0.10%
Lotus Domino	957	0.09%
SurgeSMTP	592	0.06%
Qmail Toaster	464	0.05%
Kerio	437	0.04%
OpenSMTPD	319	0.03%
Merak	280	0.03%
ArGoSoft	188	0.02%
MagicMail	174	0.02%
Post.Office	154	0.02%
Gordano Messaging Suite (GMS)	84	0.01%
GroupWise	78	0.01%
Trend Micro	63	0.01%
InterScan VirusWall	28	0.00%
VisNetic	25	0.00%
Mirapoint	14	0.00%
OpenVMS	10	0.00%
Mercury	9	0.00%
Interscan	6	0.00%
MessageWall	6	0.00%
WebSTAR V	6	0.00%
Neon Mail Server	4	0.00%
ModusMail	1	0.00%
WebSTAR	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (572,684 servers)
Version	Number of Servers	Percent
4.89	301,136	52.58%
4.87	166,825	29.13%
4.88	22,268	3.89%
4.84	18,682	3.26%
4.80	10,719	1.87%
4.86	7,925	1.38%
4.85	7,578	1.32%
4.72	7,196	1.26%
4.82	6,904	1.21%
4.76	6,684	1.17%
Other	16,767	2.93%
Postfix (339,752 servers)
Version	Number of Servers	Percent
Other	339,752	100.00%
Sendmail (47,478 servers)
Version	Number of Servers	Percent
8.14.5	12,150	25.59%
8.14.4	11,040	23.25%
8.13.8	7,581	15.97%
8.13.1	4,750	10.00%
8.15.2	2,578	5.43%
8.14.3	2,224	4.68%
8.14.7	1,725	3.63%
8.14.9	1,351	2.85%
8.14.2	476	1.00%
Other	3,603	7.59%
MailEnable (23,007 servers)
Version	Number of Servers	Percent
9.00--	3,135	13.63%
9.16--	1,327	5.77%
8.60--	1,218	5.29%
8.53--	1,049	4.56%
6.5--	875	3.80%
8.51--	685	2.98%
1.986--	579	2.52%
8.04--	501	2.18%
9.75--	455	1.98%
8.60-8.60-	423	1.84%
9.74--	354	1.54%
5.10--	338	1.47%
8.50--	337	1.46%
9.75--9.75	314	1.36%
9.53--	313	1.36%
8.00--	306	1.33%
7.06--	237	1.03%
6.0--	233	1.01%
Other	10,328	44.89%
MDaemon (11,507 servers)
Version	Number of Servers	Percent
17.0.2	1,363	11.84%
16.5.2	945	8.21%
13.5.1	565	4.91%
11.0.0	486	4.22%
11.0.3	458	3.98%
13.0.4	452	3.93%
13.0.5	450	3.91%
13.6.3	429	3.73%
16.0.4	403	3.50%
16.5.1	300	2.61%
12.5.6	256	2.22%
17.0.0	238	2.07%
15.0.3	231	2.01%
12.5.4	231	2.01%
14.5.2	201	1.75%
10.0.0	182	1.58%
10.1.2	169	1.47%
15.5.3	165	1.43%
16.0.1	151	1.31%
10.1.1	127	1.10%
10.1.0	116	1.01%
Other	3,589	31.19%
Microsoft (9,351 servers)
Version	Number of Servers	Percent
6.0.3790.4675	5,591	59.79%
7.5.7601.17514	1,126	12.04%
8.5.9600.16384	768	8.21%
6.0.3790.3959	656	7.02%
8.0.9200.16384	189	2.02%
5.0.2195.5329	172	1.84%
6.0.3790.1830	160	1.71%
7.0.6002.18264	158	1.69%
5.0.2195.7381	101	1.08%
Other	430	4.60%
IMail (2,086 servers)
Version	Number of Servers	Percent
12.5.5.115	373	17.88%
12.4.1.15	175	8.39%
8.22	153	7.33%
12.5.3.93	152	7.29%
9.23	138	6.62%
12.5.4.146	131	6.28%
8.15	96	4.60%
12.3.0.100	95	4.55%
8.05	69	3.31%
12.5.6.101	67	3.21%
11.03	58	2.78%
11.5	54	2.59%
7.07	32	1.53%
12.5.1.60	30	1.44%
10.02	27	1.29%
7.15	27	1.29%
12.5.5.117	26	1.25%
11.02	23	1.10%
10.01	22	1.05%
Other	338	16.20%
CommuniGate Pro (1,793 servers)
Version	Number of Servers	Percent
5.1.16	133	7.42%
6.1.16	114	6.36%
6.1.16.	102	5.69%
6.2	44	2.45%
6.1.11	40	2.23%
6.1.10	35	1.95%
5.4.11.	34	1.90%
5.3.13.	33	1.84%
5.4.11	31	1.73%
5.2.20	31	1.73%
6.0.11	29	1.62%
6.0.11.	28	1.56%
6.1.13	27	1.51%
6.1.10.	27	1.51%
6.1.11.	27	1.51%
5.2.20.	26	1.45%
6.1.15.	25	1.39%
6.1.2.	24	1.34%
5.1.16.	23	1.28%
6.0.9	23	1.28%
5.2.3	23	1.28%
5.0.14.	23	1.28%
6.0.9.	22	1.23%
6.1.12	22	1.23%
6.1.15	21	1.17%
6.1.13.	19	1.06%
6.1.14.	19	1.06%
6.1.2	19	1.06%
6.1.14	18	1.00%
6.1.12.	18	1.00%
6.0.10.	18	1.00%
Other	715	39.88%
XMail (1,031 servers)
Version	Number of Servers	Percent
1.27	441	42.77%
1.22	335	32.49%
1.25	79	7.66%
1.26	68	6.60%
1.24	38	3.69%
1.21	21	2.04%
1.23	14	1.36%
Other	35	3.39%
WinWebMail (1,008 servers)
Version	Number of Servers	Percent
3.9.0.7	225	22.32%
3.8.1.3	142	14.09%
3.9.0.1	70	6.94%
3.7.6.1	65	6.45%
3.8.0.1	61	6.05%
3.8.1.5	49	4.86%
3.8.1.1	37	3.67%
3.9.2.1	36	3.57%
3.9.3.1	36	3.57%
3.8.5.1	36	3.57%
3.8.6.1	35	3.47%
3.7.3.1	33	3.27%
3.7.7.3	28	2.78%
3.8.2.1	23	2.28%
3.7.1.1	19	1.88%
3.8.3.1	16	1.59%
3.9.5.1	16	1.59%
3.7.0.5	11	1.09%
Other	70	6.94%
Lotus Domino (957 servers)
Version	Number of Servers	Percent
8.5.3FP6	182	19.02%
8.5.3	126	13.17%
8.5.2	43	4.49%
8.5	36	3.76%
8.5.1	36	3.76%
7.0.2	36	3.76%
8.5.3FP2	27	2.82%
8.5.2FP4	26	2.72%
8.5.3FP3	24	2.51%
8.5.3FP1	24	2.51%
8.5.3FP4	22	2.30%
7.0.3	21	2.19%
8.5.2FP3	19	1.99%
8.5.2FP2	18	1.88%
8.5.3FP5	17	1.78%
8.0	17	1.78%
8.0.1	16	1.67%
7.0.4	15	1.57%
8.5.1FP5	15	1.57%
7.0	14	1.46%
7.0.1	13	1.36%
6.5.1	13	1.36%
6.5	11	1.15%
7.0.3FP1	11	1.15%
Other	175	18.29%
SurgeSMTP (592 servers)
Version	Number of Servers	Percent
7.2i-1	88	14.86%
7.1e-1	82	13.85%
7.3c3-3	66	11.15%
6.5a2-2	35	5.91%
7.2a-1	34	5.74%
7.2e-2	33	5.57%
6.7c-1	26	4.39%
6.9c-1	24	4.05%
6.5a-1	20	3.38%
7.0c2-2	18	3.04%
3.9e-1	15	2.53%
5.2a-1	13	2.20%
7.3d-5	11	1.86%
6.1c-1	9	1.52%
6.4a-1	9	1.52%
4.0u4-4	8	1.35%
7.3d-4	7	1.18%
3.8k4-4	7	1.18%
Other	87	14.70%
Qmail Toaster (464 servers)
Version	Number of Servers	Percent
1.3	375	80.82%
1.03	63	13.58%
1.2	11	2.37%
1.03.5	7	1.51%
Other	8	1.72%
Kerio (437 servers)
Version	Number of Servers	Percent
6.7.3	96	21.97%
6.7.0	50	11.44%
6.5.2	43	9.84%
6.6.2	42	9.61%
6.7.2	29	6.64%
6.5.0	26	5.95%
6.6.1	18	4.12%
6.4.1	17	3.89%
6.7.1	17	3.89%
6.3.1	15	3.43%
6.5.1	12	2.75%
6.3.0	11	2.52%
6.4.0	10	2.29%
6.1.3	8	1.83%
6.6.0	7	1.60%
6.4.2	5	1.14%
Other	31	7.09%
OpenSMTPD (319 servers)
Version	Number of Servers	Percent
Other	319	100.00%
Merak (280 servers)
Version	Number of Servers	Percent
8.0.3	81	28.93%
8.9.1	49	17.50%
8.5.0	24	8.57%
7.5.2	16	5.71%
7.4.5	15	5.36%
8.3.8	14	5.00%
7.6.1	12	4.29%
7.6.4	9	3.21%
7.4.2	5	1.79%
7.0.1	5	1.79%
6.1.0	4	1.43%
9.0.3	4	1.43%
7.2.0	4	1.43%
5.9.4	3	1.07%
4.2.1	3	1.07%
6.0.8	3	1.07%
Other	29	10.36%
ArGoSoft (188 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	68	36.17%
1.8 (1.8.9.5)	22	11.70%
1.8 (1.8.9.3)	21	11.17%
1.8 (1.8.9.1)	20	10.64%
1.8 (1.8.7.3)	6	3.19%
1.8 (1.8.8.7)	6	3.19%
1.8 (1.8.8.8)	5	2.66%
1.8 (1.8.9.2)	5	2.66%
1.8 (1.8.6.0)	5	2.66%
1.8 (1.8.8.9)	4	2.13%
1.8 (1.8.7.6)	2	1.06%
1.8 (1.8.8.4)	2	1.06%
1.8 (1.8.5.8)	2	1.06%
1.8 (1.8.9.4)	2	1.06%
1.8 (1.8.2.1)	2	1.06%
1.8 (1.8.5.9)	2	1.06%
Other	14	7.45%
MagicMail (174 servers)
Version	Number of Servers	Percent
Other	174	100.00%
Post.Office (154 servers)
Version	Number of Servers	Percent
4.2.2	30	19.48%
4.3	30	19.48%
4.1.2.4	20	12.99%
3.5.3	16	10.39%
4.2.1.3	8	5.19%
3.9.2.3	5	3.25%
4.2.1.1	5	3.25%
3.1.2	4	2.60%
3.9.2	3	1.95%
4.1.1	3	1.95%
3.5.1	3	1.95%
3.5.4	2	1.30%
4.0.1	2	1.30%
4.2	2	1.30%
4.1.0.3	2	1.30%
4.1.2.3	2	1.30%
3.8.7.4	2	1.30%
3.9.1.3	2	1.30%
3.5.3J	2	1.30%
Other	11	7.14%
Gordano Messaging Suite (GMS) (84 servers)
Version	Number of Servers	Percent
Other	84	100.00%
GroupWise (78 servers)
Version	Number of Servers	Percent
14.2.2	17	21.79%
14.2.1	12	15.38%
6.5.7	7	8.97%
14.2.0	6	7.69%
14.0.1	6	7.69%
14.0.0	4	5.13%
7.0.3	3	3.85%
7.0.4	3	3.85%
8.0.3	2	2.56%
12.0.4	2	2.56%
12.0.1	2	2.56%
14.0.2	2	2.56%
6.0.4	2	2.56%
7.0.2	1	1.28%
6.5.0	1	1.28%
6.0.3	1	1.28%
6.5.5	1	1.28%
7.0.1	1	1.28%
8.0.1	1	1.28%
6.5.2	1	1.28%
8.0.2	1	1.28%
6.0.2	1	1.28%
12.0.2	1	1.28%
Other	0	0.00%
Trend Micro (63 servers)
Version	Number of Servers	Percent
5.7	20	31.75%
5.18	13	20.63%
5.5	11	17.46%
7.0	8	12.70%
7.5	5	7.94%
7.1	2	3.17%
3.53	2	3.17%
8.5	1	1.59%
8	1	1.59%
Other	0	0.00%
InterScan VirusWall (28 servers)
Version	Number of Servers	Percent
Other	28	100.00%
VisNetic (25 servers)
Version	Number of Servers	Percent
9.3.2.0	8	32.00%
5.0.2.3	2	8.00%
5.8.6.6	2	8.00%
5.5.8.3	2	8.00%
6.2.2.0	1	4.00%
8.0.3	1	4.00%
9.1.4.0	1	4.00%
8.5.0.5	1	4.00%
7.6.1.0	1	4.00%
9.1.4.1	1	4.00%
8.0.3.1	1	4.00%
5.3.5.0	1	4.00%
5.0.2.0	1	4.00%
9.1.4.1 provided by Techfount Systems Pte Ltd	1	4.00%
8.5.0.8	1	4.00%
Other	0	0.00%
Mirapoint (14 servers)
Version	Number of Servers	Percent
4.4.2a-FCS	3	21.43%
4.3.5-GA	3	21.43%
4.4.3-GA	3	21.43%
4.4.4-GA	1	7.14%
3.10.10a-GA	1	7.14%
4.4.3a-GA	1	7.14%
3.7.5a-GA	1	7.14%
4.4.6-GA	1	7.14%
Other	0	0.00%
OpenVMS (10 servers)
Version	Number of Servers	Percent
7.3	6	60.00%
8.4	3	30.00%
8.2	1	10.00%
Other	0	0.00%
Mercury (9 servers)
Version	Number of Servers	Percent
3.32	4	44.44%
1.48	3	33.33%
3.21	1	11.11%
4.x	1	11.11%
Other	0	0.00%
Interscan (6 servers)
Version	Number of Servers	Percent
3.81-Build_1022	2	33.33%
3.81-Build_1084	1	16.67%
3.8-Build_3013	1	16.67%
3.8-Build_1080	1	16.67%
3.5 (build 1294)	1	16.67%
Other	0	0.00%
MessageWall (6 servers)
Version	Number of Servers	Percent
1.0.8	6	100.00%
Other	0	0.00%
WebSTAR V (6 servers)
Version	Number of Servers	Percent
5.4.1	3	50.00%
5.4.0	1	16.67%
5.3.2	1	16.67%
5.3.4	1	16.67%
Other	0	0.00%
Neon Mail Server (4 servers)
Version	Number of Servers	Percent
3.1.0	2	50.00%
3.1.3	1	25.00%
3.0.7	1	25.00%
Other	0	0.00%
ModusMail (1 servers)
Version	Number of Servers	Percent
4.1.361.21	1	100.00%
Other	0	0.00%
WebSTAR (1 servers)
Version	Number of Servers	Percent
Other	1	100.00%