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	1,577,713	100.0%
Number of Servers that didn't respond	298,340	18.91%
Server didn't open socket	291,010	18.45%
Server didn't provide banner	7,330	0.46%
Server provided banner	1,279,373	81.09%
Server banner identifies software in use	788,497	49.98%

As indicated by the above table, of the 1,577,713 servers queried, only 788,497 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	446,595	56.64%
Postfix	281,556	35.71%
Sendmail	29,197	3.70%
MailEnable	16,166	2.05%
MDaemon	5,864	0.74%
Microsoft	3,394	0.43%
CommuniGate Pro	1,116	0.14%
IMail	1,062	0.13%
XMail	657	0.08%
Qmail Toaster	538	0.07%
SurgeSMTP	428	0.05%
OpenSMTPD	412	0.05%
WinWebMail	371	0.05%
Lotus Domino	347	0.04%
Kerio	161	0.02%
MagicMail	142	0.02%
Merak	137	0.02%
Post.Office	113	0.01%
ArGoSoft	79	0.01%
GroupWise	58	0.01%
Trend Micro	34	0.00%
Gordano Messaging Suite (GMS)	34	0.00%
OpenVMS	8	0.00%
VisNetic	8	0.00%
InterScan VirusWall	5	0.00%
Mercury	4	0.00%
Interscan	3	0.00%
WebSTAR V	3	0.00%
ModusMail	2	0.00%
MessageWall	1	0.00%
WebSTAR	1	0.00%
Mirapoint	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (446,595 servers)
Version	Number of Servers	Percent
4.93	311,027	69.64%
4.92	32,950	7.38%
4.91	21,879	4.90%
4.92.3	12,379	2.77%
4.93.0.4	12,022	2.69%
4.94	11,038	2.47%
4.89	7,244	1.62%
4.87	7,201	1.61%
4.84	5,931	1.33%
Other	24,924	5.58%
Postfix (281,556 servers)
Version	Number of Servers	Percent
Other	281,556	100.00%
Sendmail (29,197 servers)
Version	Number of Servers	Percent
8.15.2	12,846	44.00%
8.14.4	5,181	17.74%
8.14.7	2,856	9.78%
8.13.8	2,490	8.53%
8.14.5	2,075	7.11%
8.14.9	815	2.79%
8.13.1	705	2.41%
8.14.3	515	1.76%
Other	1,714	5.87%
MailEnable (16,166 servers)
Version	Number of Servers	Percent
10.25--	3,753	23.22%
10.27--	3,198	19.78%
9.00--	708	4.38%
10.29--	445	2.75%
10.30--	311	1.92%
10.12--	249	1.54%
9.16--	247	1.53%
8.60--	225	1.39%
10.30--10.30	205	1.27%
10.29-10.29-	179	1.11%
9.00--9.00	164	1.01%
10.29--10.29	162	1.00%
Other	6,320	39.09%
MDaemon (5,864 servers)
Version	Number of Servers	Percent
19.5.5	1,020	17.39%
13.5.1	408	6.96%
13.6.3	349	5.95%
13.0.4	241	4.11%
13.0.5	230	3.92%
11.0.3	219	3.73%
11.0.0	203	3.46%
16.5.2	164	2.80%
19.5.4	138	2.35%
12.5.6	127	2.17%
12.5.4	121	2.06%
14.5.2	103	1.76%
19.5.3	80	1.36%
19.0.3	73	1.24%
10.0.0	73	1.24%
15.0.3	68	1.16%
10.1.2	67	1.14%
20.0.0	64	1.09%
10.1.0	63	1.07%
16.0.4	61	1.04%
Other	1,992	33.97%
Microsoft (3,394 servers)
Version	Number of Servers	Percent
6.0.3790.4675	1,380	40.66%
8.5.9600.16384	523	15.41%
7.5.7601.17514	380	11.20%
10.0.14393.2608	263	7.75%
6.0.3790.3959	195	5.75%
10.0.17763.1	120	3.54%
5.0.2195.5329	107	3.15%
8.0.9200.16384	78	2.30%
6.0.3790.1830	51	1.50%
5.0.2195.6713	50	1.47%
7.0.6002.18264	42	1.24%
5.0.2195.7381	37	1.09%
Other	168	4.95%
CommuniGate Pro (1,116 servers)
Version	Number of Servers	Percent
6.2.14	72	6.45%
6.2.14.	53	4.75%
6.2.15.	53	4.75%
5.3.13.	31	2.78%
6.2.15	30	2.69%
6.0.11.	26	2.33%
6.2.12	25	2.24%
6.1.20.	24	2.15%
6.1.20	21	1.88%
5.2.20.	20	1.79%
6.0.11	20	1.79%
5.4.11	20	1.79%
6.1.16.	18	1.61%
6.1.16	18	1.61%
5.1.16	18	1.61%
6.2.12.	16	1.43%
6.1.18	15	1.34%
5.4.11.	12	1.08%
Other	624	55.91%
IMail (1,062 servers)
Version	Number of Servers	Percent
12.5.7.59	136	12.81%
12.5.6.101	123	11.58%
12.4.1.15	109	10.26%
12.5.8.41	104	9.79%
9.23	64	6.03%
8.22	52	4.90%
12.5.3.93	50	4.71%
12.3.0.100	42	3.95%
12.5.5.115	41	3.86%
8.05	38	3.58%
8.15	34	3.20%
11.03	26	2.45%
12.5.4.146	24	2.26%
12.5.6.105	22	2.07%
10.02	20	1.88%
12.5.7.58	19	1.79%
12.5.5.117	19	1.79%
11.5	12	1.13%
7.15	11	1.04%
7.07	11	1.04%
Other	105	9.89%
XMail (657 servers)
Version	Number of Servers	Percent
1.27	332	50.53%
1.22	212	32.27%
1.26	35	5.33%
1.25	30	4.57%
1.24	20	3.04%
Other	28	4.26%
Qmail Toaster (538 servers)
Version	Number of Servers	Percent
1.3	386	71.75%
1.03	140	26.02%
1.03.5	6	1.12%
Other	6	1.12%
SurgeSMTP (428 servers)
Version	Number of Servers	Percent
7.3o4-4	87	20.33%
7.4e-1	43	10.05%
7.3e2-2	33	7.71%
7.4o-1	23	5.37%
7.4m-1	22	5.14%
7.1e-1	20	4.67%
7.3i2-2	20	4.67%
6.5a2-2	17	3.97%
7.4p-9	14	3.27%
6.7c-1	12	2.80%
7.2a-1	10	2.34%
7.2i-1	10	2.34%
3.9e-1	7	1.64%
7.0c2-2	7	1.64%
7.4g-1	5	1.17%
6.5a-1	5	1.17%
6.9c-1	5	1.17%
4.0u4-4	5	1.17%
7.4i-1	5	1.17%
Other	78	18.22%
OpenSMTPD (412 servers)
Version	Number of Servers	Percent
Other	412	100.00%
WinWebMail (371 servers)
Version	Number of Servers	Percent
4.2.0.1	91	24.53%
3.9.0.7	62	16.71%
3.8.1.3	39	10.51%
3.9.0.1	26	7.01%
4.1.0.1	16	4.31%
3.7.6.1	15	4.04%
3.8.0.1	13	3.50%
4.0.0.1	12	3.23%
3.8.1.5	11	2.96%
3.7.3.1	10	2.70%
3.8.5.1	8	2.16%
3.8.3.1	7	1.89%
3.8.1.1	7	1.89%
3.9.2.1	7	1.89%
3.8.6.1	6	1.62%
3.7.7.3	6	1.62%
3.9.3.1	5	1.35%
1.0	5	1.35%
3.9.5.3	5	1.35%
Other	20	5.39%
Lotus Domino (347 servers)
Version	Number of Servers	Percent
8.5.3FP6	74	21.33%
8.5.3	47	13.54%
8.5.1	16	4.61%
8.5.2	15	4.32%
7.0.2	13	3.75%
7.0	11	3.17%
8.5.2FP2	11	3.17%
8.5	10	2.88%
8.5.3FP3	9	2.59%
7.0.3	7	2.02%
8.5.3FP1	7	2.02%
8.5.3FP5	6	1.73%
8.5.2FP4HF759	6	1.73%
8.5.3FP4	6	1.73%
8.5.2FP4	6	1.73%
8.0.1	6	1.73%
8.5.2FP3	6	1.73%
6.5	5	1.44%
6.5.4	5	1.44%
6.5.3	5	1.44%
8.5.1FP5	5	1.44%
8.0.2	4	1.15%
8.0	4	1.15%
6.5.1	4	1.15%
8.5.3FP2	4	1.15%
7.0.3FP1	4	1.15%
7.0.4	4	1.15%
Other	47	13.54%
Kerio (161 servers)
Version	Number of Servers	Percent
6.7.3	37	22.98%
6.7.0	26	16.15%
6.7.2	19	11.80%
6.6.2	16	9.94%
6.7.1	10	6.21%
6.6.1	9	5.59%
6.5.2	8	4.97%
6.5.0	8	4.97%
6.3.1	4	2.48%
6.3.0	3	1.86%
6.4.1	3	1.86%
5.7.9	2	1.24%
6.4.0	2	1.24%
5.7.6	2	1.24%
6.1.0	2	1.24%
6.5.1	2	1.24%
Other	8	4.97%
MagicMail (142 servers)
Version	Number of Servers	Percent
Other	142	100.00%
Merak (137 servers)
Version	Number of Servers	Percent
8.9.1	36	26.28%
8.0.3	29	21.17%
7.6.1	11	8.03%
7.4.5	8	5.84%
9.0.3	8	5.84%
8.5.0	7	5.11%
8.3.8	6	4.38%
7.5.2	4	2.92%
7.6.4	3	2.19%
6.0.8	3	2.19%
7.4.2	2	1.46%
4.4.1	2	1.46%
7.6.0	2	1.46%
7.0.1	2	1.46%
Other	14	10.22%
Post.Office (113 servers)
Version	Number of Servers	Percent
4.3	26	23.01%
4.4	23	20.35%
4.2.2	18	15.93%
4.1.2.4	11	9.73%
3.5.3	7	6.19%
4.2.1.3	5	4.42%
4.0.1	3	2.65%
3.5.1	3	2.65%
4.2.1.1	3	2.65%
3.9.2	2	1.77%
4.1.1	2	1.77%
Other	10	8.85%
ArGoSoft (79 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	25	31.65%
1.8 (1.8.9.3)	15	18.99%
1.8 (1.8.9.5)	12	15.19%
1.8 (1.8.9.1)	5	6.33%
1.8 (1.8.7.6)	2	2.53%
1.8 (1.8.7.3)	2	2.53%
1.8 (1.8.8.9)	2	2.53%
1.8 (1.8.8.7)	2	2.53%
1.8 (1.8.9.2)	2	2.53%
1.8 (1.8.6.1)	1	1.27%
1.8 (1.8.8.8)	1	1.27%
1.8 (1.8.5.5)	1	1.27%
1.8 (1.8.5.8)	1	1.27%
1.8 (1.8.8.4)	1	1.27%
1.8 (1.8.9.0)	1	1.27%
1.8 (1.8.6.0)	1	1.27%
1.8 (1.8.9.4)	1	1.27%
1.8 (1.8.1.1)	1	1.27%
1.8 (1.8.2.1)	1	1.27%
1.8 (1.8.5.9)	1	1.27%
1.8 (1.8.2.5)	1	1.27%
Other	0	0.00%
GroupWise (58 servers)
Version	Number of Servers	Percent
18.1.1	9	15.52%
14.2.2	9	15.52%
18.2.0	7	12.07%
14.2.1	5	8.62%
18.2.1	5	8.62%
14.2.3	4	6.90%
18.0.2	4	6.90%
18.1.0	4	6.90%
14.2.0	2	3.45%
6.5.7	1	1.72%
14.0.1	1	1.72%
6.5.0	1	1.72%
6.5.5	1	1.72%
7.0.1	1	1.72%
6.5.2	1	1.72%
14.0.0	1	1.72%
6.0.2	1	1.72%
18.0.0	1	1.72%
Other	0	0.00%
Trend Micro (34 servers)
Version	Number of Servers	Percent
5.7	10	29.41%
5.18	9	26.47%
5.5	5	14.71%
7.5	5	14.71%
7.0	2	5.88%
7.5ready	1	2.94%
8	1	2.94%
7.1	1	2.94%
Other	0	0.00%
Gordano Messaging Suite (GMS) (34 servers)
Version	Number of Servers	Percent
Other	34	100.00%
OpenVMS (8 servers)
Version	Number of Servers	Percent
8.4	3	37.50%
7.3	3	37.50%
8.3	1	12.50%
8.2	1	12.50%
Other	0	0.00%
VisNetic (8 servers)
Version	Number of Servers	Percent
9.3.2.0	6	75.00%
8.0.3	1	12.50%
6.2.2.0	1	12.50%
Other	0	0.00%
InterScan VirusWall (5 servers)
Version	Number of Servers	Percent
Other	5	100.00%
Mercury (4 servers)
Version	Number of Servers	Percent
1.48	2	50.00%
3.32	1	25.00%
4	1	25.00%
Other	0	0.00%
Interscan (3 servers)
Version	Number of Servers	Percent
3.8-Build_3013	1	33.33%
3.8-Build_1080	1	33.33%
3.81-Build_1022	1	33.33%
Other	0	0.00%
WebSTAR V (3 servers)
Version	Number of Servers	Percent
5.4.1	3	100.00%
Other	0	0.00%
ModusMail (2 servers)
Version	Number of Servers	Percent
4.1.361.21	2	100.00%
Other	0	0.00%
MessageWall (1 servers)
Version	Number of Servers	Percent
1.0.8	1	100.00%
Other	0	0.00%
WebSTAR (1 servers)
Version	Number of Servers	Percent
Other	1	100.00%
Mirapoint (1 servers)
Version	Number of Servers	Percent
4.4.6-GA	1	100.00%
Other	0	0.00%