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	1,783,405	100.0%
Number of Servers that didn't respond	305,881	17.15%
Server didn't open socket	299,476	16.79%
Server didn't provide banner	6,405	0.36%
Server provided banner	1,477,524	82.85%
Server banner identifies software in use	917,904	51.47%

As indicated by the above table, of the 1,783,405 servers queried, only 917,904 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	524,584	57.15%
Postfix	309,591	33.73%
Sendmail	39,235	4.27%
MailEnable	20,373	2.22%
MDaemon	9,192	1.00%
Microsoft	6,694	0.73%
IMail	1,710	0.19%
CommuniGate Pro	1,441	0.16%
XMail	907	0.10%
Lotus Domino	686	0.07%
WinWebMail	655	0.07%
Qmail Toaster	623	0.07%
SurgeSMTP	565	0.06%
Kerio	341	0.04%
OpenSMTPD	310	0.03%
Merak	225	0.02%
MagicMail	169	0.02%
ArGoSoft	155	0.02%
Post.Office	128	0.01%
GroupWise	87	0.01%
Gordano Messaging Suite (GMS)	79	0.01%
Trend Micro	54	0.01%
InterScan VirusWall	25	0.00%
VisNetic	18	0.00%
OpenVMS	17	0.00%
Mirapoint	11	0.00%
Mercury	8	0.00%
Interscan	5	0.00%
WebSTAR V	5	0.00%
Neon Mail Server	4	0.00%
ModusMail	3	0.00%
MessageWall	3	0.00%
WebSTAR	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (524,584 servers)
Version	Number of Servers	Percent
4.89	392,670	74.85%
4.87	39,334	7.50%
4.90	30,031	5.72%
4.84	15,160	2.89%
4.80	6,299	1.20%
4.86	5,678	1.08%
Other	35,412	6.75%
Postfix (309,591 servers)
Version	Number of Servers	Percent
Other	309,591	100.00%
Sendmail (39,235 servers)
Version	Number of Servers	Percent
8.14.5	11,063	28.20%
8.14.4	8,880	22.63%
8.13.8	5,513	14.05%
8.13.1	3,473	8.85%
8.15.2	2,798	7.13%
8.14.7	1,987	5.06%
8.14.3	1,407	3.59%
8.14.9	1,187	3.03%
Other	2,927	7.46%
MailEnable (20,373 servers)
Version	Number of Servers	Percent
9.00--	2,619	12.86%
9.16--	2,297	11.27%
8.60--	855	4.20%
8.53--	767	3.76%
6.5--	618	3.03%
8.51--	541	2.66%
8.04--	394	1.93%
1.986--	374	1.84%
8.60-8.60-	361	1.77%
9.75--	346	1.70%
10.14--	287	1.41%
8.50--	254	1.25%
5.10--	232	1.14%
10.11--	206	1.01%
Other	10,222	50.17%
MDaemon (9,192 servers)
Version	Number of Servers	Percent
17.5.3	745	8.10%
17.5.2	579	6.30%
13.5.1	496	5.40%
13.6.3	450	4.90%
16.5.2	447	4.86%
11.0.3	368	4.00%
11.0.0	364	3.96%
13.0.4	361	3.93%
13.0.5	354	3.85%
17.5.1	227	2.47%
16.0.4	226	2.46%
12.5.6	208	2.26%
12.5.4	187	2.03%
14.5.2	174	1.89%
17.0.2	156	1.70%
16.5.1	153	1.66%
10.1.2	146	1.59%
15.0.3	145	1.58%
10.0.0	138	1.50%
16.0.1	100	1.09%
10.1.0	96	1.04%
15.5.3	93	1.01%
Other	2,979	32.41%
Microsoft (6,694 servers)
Version	Number of Servers	Percent
6.0.3790.4675	3,679	54.96%
7.5.7601.17514	866	12.94%
8.5.9600.16384	693	10.35%
6.0.3790.3959	456	6.81%
8.0.9200.16384	169	2.52%
5.0.2195.5329	137	2.05%
10.0.14393.0	110	1.64%
6.0.3790.1830	109	1.63%
7.0.6002.18264	107	1.60%
5.0.2195.6713	67	1.00%
Other	301	4.50%
IMail (1,710 servers)
Version	Number of Servers	Percent
12.5.6.101	207	12.11%
8.22	185	10.82%
12.5.5.115	179	10.47%
12.4.1.15	135	7.89%
9.23	105	6.14%
12.5.3.93	104	6.08%
12.5.4.146	102	5.96%
12.3.0.100	86	5.03%
8.15	80	4.68%
11.03	53	3.10%
8.05	52	3.04%
11.5	33	1.93%
7.07	26	1.52%
12.5.5.117	25	1.46%
12.5.1.60	23	1.35%
10.01	20	1.17%
7.15	19	1.11%
10.02	19	1.11%
Other	257	15.03%
CommuniGate Pro (1,441 servers)
Version	Number of Servers	Percent
6.1.16	95	6.59%
6.1.18	78	5.41%
6.0.11	52	3.61%
6.2.1	47	3.26%
5.4.11	47	3.26%
6.2.2	46	3.19%
5.2.20	43	2.98%
5.1.16	41	2.85%
6.1.11	40	2.78%
6.0.9	36	2.50%
6.1.10	36	2.50%
6.2.0	34	2.36%
6.2.3	34	2.36%
5.3.13	33	2.29%
6.1.2	28	1.94%
5.2.3	28	1.94%
6.1.19	26	1.80%
6.1.17	26	1.80%
6.1.15	25	1.73%
5.0.14	24	1.67%
6.1.14	23	1.60%
6.1.13	22	1.53%
4.1.8	22	1.53%
6.2	21	1.46%
6.1.12	20	1.39%
6.1.8	19	1.32%
6.1.5	16	1.11%
6.0.10	16	1.11%
5.3.15	15	1.04%
6.1.9	15	1.04%
5.4.4	15	1.04%
Other	418	29.01%
XMail (907 servers)
Version	Number of Servers	Percent
1.27	412	45.42%
1.22	278	30.65%
1.25	67	7.39%
1.26	59	6.50%
1.24	32	3.53%
1.21	16	1.76%
1.23	14	1.54%
Other	29	3.20%
Lotus Domino (686 servers)
Version	Number of Servers	Percent
8.5.3FP6	133	19.39%
8.5.3	104	15.16%
8.5.2	32	4.66%
7.0.2	25	3.64%
8.5.1	24	3.50%
8.5	20	2.92%
8.5.3FP2	19	2.77%
8.5.3FP4	17	2.48%
8.5.3FP1	17	2.48%
7.0.3	16	2.33%
8.5.2FP3	15	2.19%
8.5.3FP3	14	2.04%
8.5.2FP4	13	1.90%
8.5.2FP2	13	1.90%
7.0	11	1.60%
8.5.3FP5	11	1.60%
8.0.1	11	1.60%
8.0	11	1.60%
6.5	9	1.31%
7.0.1	9	1.31%
7.0.4	8	1.17%
8.0.2	8	1.17%
6.5.1	8	1.17%
7.0.3FP1	8	1.17%
6.5.4	7	1.02%
Other	123	17.93%
WinWebMail (655 servers)
Version	Number of Servers	Percent
3.9.0.7	146	22.29%
3.8.1.3	96	14.66%
3.9.0.1	43	6.56%
3.8.0.1	39	5.95%
4.0.0.1	38	5.80%
3.7.6.1	33	5.04%
3.8.1.5	26	3.97%
3.9.5.3	21	3.21%
3.8.1.1	21	3.21%
3.7.3.1	19	2.90%
3.8.5.1	19	2.90%
3.9.3.1	17	2.60%
3.7.7.3	16	2.44%
3.8.6.1	15	2.29%
3.9.2.1	14	2.14%
3.8.3.1	13	1.98%
3.9.5.1	13	1.98%
3.8.2.1	11	1.68%
3.7.1.1	10	1.53%
Other	45	6.87%
Qmail Toaster (623 servers)
Version	Number of Servers	Percent
1.3	502	80.58%
1.03	86	13.80%
1.03.5	11	1.77%
1.2	10	1.61%
1.03.6	9	1.44%
Other	5	0.80%
SurgeSMTP (565 servers)
Version	Number of Servers	Percent
7.3e2-2	185	32.74%
7.1e-1	51	9.03%
6.5a2-2	35	6.19%
7.2i-1	30	5.31%
6.7c-1	26	4.60%
6.9c-1	26	4.60%
7.2a-1	22	3.89%
7.3c3-3	19	3.36%
7.2e-2	15	2.65%
6.5a-1	14	2.48%
7.0c2-2	14	2.48%
3.9e-1	13	2.30%
5.2a-1	10	1.77%
7.3g-1	8	1.42%
4.0u4-4	7	1.24%
7.3h-6	6	1.06%
6.1c-1	6	1.06%
6.4a-1	6	1.06%
Other	72	12.74%
Kerio (341 servers)
Version	Number of Servers	Percent
6.7.3	69	20.23%
6.7.0	50	14.66%
6.5.2	38	11.14%
6.6.2	33	9.68%
6.7.2	20	5.87%
6.5.0	18	5.28%
6.4.1	17	4.99%
6.6.1	16	4.69%
6.7.1	15	4.40%
6.3.1	9	2.64%
6.4.0	9	2.64%
6.5.1	6	1.76%
6.6.0	6	1.76%
6.4.2	5	1.47%
6.3.0	4	1.17%
6.1.3	4	1.17%
5.7.9	4	1.17%
Other	18	5.28%
OpenSMTPD (310 servers)
Version	Number of Servers	Percent
Other	310	100.00%
Merak (225 servers)
Version	Number of Servers	Percent
8.0.3	65	28.89%
8.9.1	40	17.78%
8.5.0	17	7.56%
7.5.2	13	5.78%
7.4.5	13	5.78%
8.3.8	13	5.78%
7.6.1	11	4.89%
7.6.4	8	3.56%
9.0.3	5	2.22%
4.2.1	3	1.33%
7.6.0	3	1.33%
7.2.0	3	1.33%
6.0.8	3	1.33%
Other	28	12.44%
MagicMail (169 servers)
Version	Number of Servers	Percent
Other	169	100.00%
ArGoSoft (155 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	53	34.19%
1.8 (1.8.9.3)	20	12.90%
1.8 (1.8.9.5)	20	12.90%
1.8 (1.8.9.1)	16	10.32%
1.8 (1.8.7.3)	5	3.23%
1.8 (1.8.9.2)	5	3.23%
1.8 (1.8.8.8)	4	2.58%
1.8 (1.8.8.9)	4	2.58%
1.8 (1.8.9.4)	3	1.94%
1.8 (1.8.6.0)	3	1.94%
1.8 (1.8.7.6)	2	1.29%
1.8 (1.8.8.4)	2	1.29%
1.8 (1.8.8.7)	2	1.29%
1.8 (1.8.5.8)	2	1.29%
1.8 (1.8.2.1)	2	1.29%
Other	12	7.74%
Post.Office (128 servers)
Version	Number of Servers	Percent
4.3	34	26.56%
4.2.2	26	20.31%
4.1.2.4	12	9.38%
3.5.3	12	9.38%
4.2.1.3	7	5.47%
4.1.1	4	3.12%
3.9.2.3	3	2.34%
4.2.1.1	3	2.34%
3.5.1	3	2.34%
3.5.3J	3	2.34%
3.1.2	3	2.34%
4.4	2	1.56%
Other	16	12.50%
GroupWise (87 servers)
Version	Number of Servers	Percent
14.2.2	21	24.14%
14.2.1	8	9.20%
14.2.0	6	6.90%
6.5.7	6	6.90%
18.0.0	6	6.90%
14.0.1	5	5.75%
18.0.1	5	5.75%
7.0.3	4	4.60%
8.0.3	4	4.60%
7.0.2	3	3.45%
14.2.3	2	2.30%
14.0.0	2	2.30%
7.0.4	2	2.30%
6.0.2	2	2.30%
6.5.4	1	1.15%
6.5.0	1	1.15%
6.0.3	1	1.15%
6.5.5	1	1.15%
12.0.1	1	1.15%
7.0.1	1	1.15%
8.0.0	1	1.15%
14.0.2	1	1.15%
8.0.1	1	1.15%
6.0.4	1	1.15%
12.0.2	1	1.15%
Other	0	0.00%
Gordano Messaging Suite (GMS) (79 servers)
Version	Number of Servers	Percent
Other	79	100.00%
Trend Micro (54 servers)
Version	Number of Servers	Percent
5.7	16	29.63%
5.5	10	18.52%
5.18	9	16.67%
7.0	8	14.81%
7.5	5	9.26%
3.53	2	3.70%
7.1	1	1.85%
8.5	1	1.85%
7.5ready	1	1.85%
9.0	1	1.85%
Other	0	0.00%
InterScan VirusWall (25 servers)
Version	Number of Servers	Percent
Other	25	100.00%
VisNetic (18 servers)
Version	Number of Servers	Percent
9.3.2.0	7	38.89%
5.5.8.3	2	11.11%
5.0.2.3	2	11.11%
6.2.2.0	1	5.56%
8.0.3	1	5.56%
5.8.6.6	1	5.56%
9.1.4.0	1	5.56%
8.0.3.1	1	5.56%
5.0.2.0	1	5.56%
8.5.0.8	1	5.56%
Other	0	0.00%
OpenVMS (17 servers)
Version	Number of Servers	Percent
8.4	8	47.06%
7.3	6	35.29%
8.3	2	11.76%
8.2	1	5.88%
Other	0	0.00%
Mirapoint (11 servers)
Version	Number of Servers	Percent
4.4.2a-FCS	2	18.18%
4.3.5-GA	2	18.18%
4.4.3-GA	2	18.18%
4.1.9-GA	1	9.09%
4.3.6-GA	1	9.09%
3.10.10a-GA	1	9.09%
4.4.3a-GA	1	9.09%
4.4.5-GA	1	9.09%
Other	0	0.00%
Mercury (8 servers)
Version	Number of Servers	Percent
3.32	4	50.00%
1.48	3	37.50%
3.21	1	12.50%
Other	0	0.00%
Interscan (5 servers)
Version	Number of Servers	Percent
3.81-Build_1022	2	40.00%
3.81-Build_1084	1	20.00%
3.8-Build_3013	1	20.00%
3.5 (build 1294)	1	20.00%
Other	0	0.00%
WebSTAR V (5 servers)
Version	Number of Servers	Percent
5.4.1	4	80.00%
5.3.4	1	20.00%
Other	0	0.00%
Neon Mail Server (4 servers)
Version	Number of Servers	Percent
3.0.7	1	25.00%
3.1.0	1	25.00%
3.1.5	1	25.00%
3.1.2	1	25.00%
Other	0	0.00%
ModusMail (3 servers)
Version	Number of Servers	Percent
4.1.361.21	2	66.67%
4.35.477.8	1	33.33%
Other	0	0.00%
MessageWall (3 servers)
Version	Number of Servers	Percent
1.0.8	3	100.00%
Other	0	0.00%
WebSTAR (1 servers)
Version	Number of Servers	Percent
Other	1	100.00%