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	1,419,055	100.0%
Number of Servers that didn't respond	255,306	17.99%
Server didn't open socket	251,216	17.70%
Server didn't provide banner	4,090	0.29%
Server provided banner	1,163,749	82.01%
Server banner identifies software in use	735,124	51.80%

As indicated by the above table, of the 1,419,055 servers queried, only 735,124 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	426,095	57.96%
Postfix	256,725	34.92%
Sendmail	25,857	3.52%
MailEnable	14,689	2.00%
MDaemon	4,333	0.59%
Microsoft	2,453	0.33%
CommuniGate Pro	958	0.13%
IMail	853	0.12%
XMail	560	0.08%
Qmail Toaster	559	0.08%
OpenSMTPD	447	0.06%
SurgeSMTP	414	0.06%
Lotus Domino	277	0.04%
WinWebMail	222	0.03%
MagicMail	163	0.02%
Kerio	119	0.02%
Merak	111	0.02%
Post.Office	87	0.01%
ArGoSoft	62	0.01%
GroupWise	53	0.01%
Gordano Messaging Suite (GMS)	34	0.00%
Trend Micro	20	0.00%
OpenVMS	13	0.00%
VisNetic	5	0.00%
InterScan VirusWall	5	0.00%
ModusMail	2	0.00%
Interscan	2	0.00%
Mercury	2	0.00%
MessageWall	2	0.00%
WebSTAR	1	0.00%
Mirapoint	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (426,095 servers)
Version	Number of Servers	Percent
4.94.2	297,315	69.78%
4.93	58,862	13.81%
4.94	14,921	3.50%
4.92	9,626	2.26%
4.91	7,517	1.76%
4.92.3	5,645	1.32%
4.89	5,292	1.24%
Other	26,917	6.32%
Postfix (256,725 servers)
Version	Number of Servers	Percent
Other	256,725	100.00%
Sendmail (25,857 servers)
Version	Number of Servers	Percent
8.15.2	12,490	48.30%
8.14.4	3,773	14.59%
8.14.7	3,089	11.95%
8.13.8	1,713	6.62%
8.14.5	1,584	6.13%
8.16.1	739	2.86%
8.14.9	506	1.96%
8.13.1	498	1.93%
8.14.3	324	1.25%
Other	1,141	4.41%
MailEnable (14,689 servers)
Version	Number of Servers	Percent
10.27--	5,584	38.01%
10.25--	1,436	9.78%
9.00--	464	3.16%
10.31--	386	2.63%
10.34--	298	2.03%
10.29--	251	1.71%
10.31-10.31-	232	1.58%
10.30--	211	1.44%
10.34--10.34	173	1.18%
10.31--10.31	165	1.12%
9.16--	159	1.08%
Other	5,330	36.29%
MDaemon (4,333 servers)
Version	Number of Servers	Percent
21.0.2	543	12.53%
13.5.1	301	6.95%
21.0.1	219	5.05%
13.0.4	175	4.04%
19.5.5	172	3.97%
13.0.5	168	3.88%
11.0.0	159	3.67%
11.0.3	159	3.67%
19.5.4	143	3.30%
16.5.2	118	2.72%
12.5.6	99	2.28%
20.0.4	94	2.17%
14.5.2	81	1.87%
20.0.3	73	1.68%
21.0.0	61	1.41%
12.5.4	59	1.36%
10.0.0	56	1.29%
15.0.3	47	1.08%
10.1.2	45	1.04%
Other	1,561	36.03%
Microsoft (2,453 servers)
Version	Number of Servers	Percent
6.0.3790.4675	885	36.08%
8.5.9600.16384	389	15.86%
7.5.7601.17514	219	8.93%
10.0.14393.4169	193	7.87%
6.0.3790.3959	147	5.99%
10.0.17763.1697	125	5.10%
5.0.2195.5329	92	3.75%
8.0.9200.16384	60	2.45%
10.0.14393.2608	50	2.04%
10.0.17763.1	42	1.71%
5.0.2195.6713	40	1.63%
6.0.3790.1830	36	1.47%
7.0.6002.18264	33	1.35%
Other	142	5.79%
CommuniGate Pro (958 servers)
Version	Number of Servers	Percent
6.2.15	127	13.26%
6.2.14	103	10.75%
6.1.20	39	4.07%
6.0.11	32	3.34%
6.2.12	31	3.24%
5.2.20	24	2.51%
6.3.5	24	2.51%
5.4.11	23	2.40%
6.1.16	22	2.30%
6.1.18	19	1.98%
6.3.3	18	1.88%
6.0.9	16	1.67%
5.1.16	15	1.57%
6.3.6	15	1.57%
6.3.7	13	1.36%
6.2.10	13	1.36%
6.3.4	13	1.36%
6.2.7	12	1.25%
6.1.11	11	1.15%
5.2.3	11	1.15%
6.2.13	10	1.04%
6.2.9	10	1.04%
Other	357	37.27%
IMail (853 servers)
Version	Number of Servers	Percent
12.5.8.41	140	16.41%
12.5.7.59	94	11.02%
12.5.6.101	91	10.67%
12.4.1.15	91	10.67%
9.23	50	5.86%
8.22	37	4.34%
12.5.3.93	34	3.99%
8.05	34	3.99%
12.3.0.100	30	3.52%
12.5.6.105	26	3.05%
12.5.5.115	25	2.93%
8.15	22	2.58%
10.02	20	2.34%
12.5.4.146	19	2.23%
12.5.7.58	14	1.64%
12.5.5.117	13	1.52%
11.5	10	1.17%
7.07	9	1.06%
Other	94	11.02%
XMail (560 servers)
Version	Number of Servers	Percent
1.27	289	51.61%
1.22	185	33.04%
1.26	26	4.64%
1.25	24	4.29%
1.24	17	3.04%
Other	19	3.39%
Qmail Toaster (559 servers)
Version	Number of Servers	Percent
1.3	396	70.84%
1.03	151	27.01%
1.03.5	6	1.07%
Other	6	1.07%
OpenSMTPD (447 servers)
Version	Number of Servers	Percent
Other	447	100.00%
SurgeSMTP (414 servers)
Version	Number of Servers	Percent
7.5c-1	56	13.53%
7.3o4-4	56	13.53%
7.4o-1	40	9.66%
7.5a-1	39	9.42%
7.3e2-2	24	5.80%
7.4e-1	18	4.35%
7.1e-1	17	4.11%
7.2i-1	12	2.90%
6.7c-1	11	2.66%
7.5d-7	11	2.66%
7.3i2-2	11	2.66%
6.5a2-2	10	2.42%
7.5d-2	9	2.17%
7.2a-1	8	1.93%
7.5b-22	5	1.21%
6.5a-1	5	1.21%
Other	82	19.81%
Lotus Domino (277 servers)
Version	Number of Servers	Percent
8.5.3FP6	57	20.58%
8.5.3	50	18.05%
8.5.1	15	5.42%
7.0	12	4.33%
8.5.2	10	3.61%
7.0.2	10	3.61%
8.5	9	3.25%
8.5.3FP3	7	2.53%
8.5.2FP2	7	2.53%
6.5	5	1.81%
7.0.3	5	1.81%
8.0	5	1.81%
8.5.3FP5	4	1.44%
8.5.3FP1	4	1.44%
8.5.1FP5	4	1.44%
8.5.3FP4	4	1.44%
6.5.1	4	1.44%
8.5.2FP3	4	1.44%
7.0.3FP1	4	1.44%
8.5.2FP4HF759	3	1.08%
8.5.2FP4	3	1.08%
6.5.4	3	1.08%
8.0.1	3	1.08%
5.0.8	3	1.08%
Other	42	15.16%
WinWebMail (222 servers)
Version	Number of Servers	Percent
4.2.0.1	47	21.17%
3.9.0.7	32	14.41%
4.3.0.1	25	11.26%
3.8.1.3	22	9.91%
3.9.0.1	13	5.86%
3.7.3.1	9	4.05%
3.8.0.1	9	4.05%
3.8.1.1	8	3.60%
4.0.0.1	8	3.60%
4.1.0.1	6	2.70%
3.7.6.1	6	2.70%
3.8.1.5	5	2.25%
3.8.6.1	4	1.80%
3.9.3.1	3	1.35%
3.7.7.3	3	1.35%
Other	22	9.91%
MagicMail (163 servers)
Version	Number of Servers	Percent
Other	163	100.00%
Kerio (119 servers)
Version	Number of Servers	Percent
6.7.3	29	24.37%
6.7.0	18	15.13%
6.6.2	13	10.92%
6.6.1	10	8.40%
6.7.2	10	8.40%
6.5.0	7	5.88%
6.5.2	6	5.04%
6.7.1	5	4.20%
6.3.1	2	1.68%
6.4.0	2	1.68%
6.4.1	2	1.68%
6.3.0	2	1.68%
5.7.9	2	1.68%
6.0.5	2	1.68%
5.7.6	2	1.68%
6.5.1	2	1.68%
Other	5	4.20%
Merak (111 servers)
Version	Number of Servers	Percent
8.9.1	31	27.93%
8.0.3	26	23.42%
7.6.1	8	7.21%
7.4.5	7	6.31%
9.0.3	7	6.31%
8.3.8	5	4.50%
8.5.0	3	2.70%
6.0.8	3	2.70%
7.4.2	2	1.80%
7.5.2	2	1.80%
7.6.4	2	1.80%
7.6.0	2	1.80%
Other	13	11.71%
Post.Office (87 servers)
Version	Number of Servers	Percent
4.4	25	28.74%
4.3	19	21.84%
4.2.2	13	14.94%
3.5.3	7	8.05%
4.1.2.4	6	6.90%
4.2.1.3	4	4.60%
3.9.2	2	2.30%
4.2.1.1	2	2.30%
4.1.1	1	1.15%
3.5.3J	1	1.15%
3.5.1	1	1.15%
4.1.0.3	1	1.15%
4.1	1	1.15%
3.1.2	1	1.15%
3.1.2J	1	1.15%
4.2	1	1.15%
4.2.1	1	1.15%
Other	0	0.00%
ArGoSoft (62 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	21	33.87%
1.8 (1.8.9.3)	9	14.52%
1.8 (1.8.9.5)	7	11.29%
1.8 (1.8.9.1)	4	6.45%
1.8 (1.8.8.8)	2	3.23%
1.8 (1.8.7.6)	2	3.23%
1.8 (1.8.8.9)	2	3.23%
1.8 (1.8.8.7)	2	3.23%
1.8 (1.8.9.2)	2	3.23%
1.8 (1.8.2.1)	2	3.23%
1.8 (1.8.6.1)	1	1.61%
1.8 (1.8.5.5)	1	1.61%
1.8 (1.8.7.3)	1	1.61%
1.8 (1.8.5.8)	1	1.61%
1.8 (1.8.8.4)	1	1.61%
1.8 (1.8.6.0)	1	1.61%
1.8 (1.8.9.4)	1	1.61%
1.8 (1.8.3.5)	1	1.61%
1.8 (1.8.2.5)	1	1.61%
Other	0	0.00%
GroupWise (53 servers)
Version	Number of Servers	Percent
18.2.1	8	15.09%
18.1.1	8	15.09%
18.2.0	7	13.21%
18.3.1	5	9.43%
18.1.0	5	9.43%
14.2.2	4	7.55%
14.0.0	3	5.66%
18.3.0	2	3.77%
14.2.3	2	3.77%
6.5.7	1	1.89%
18.0.0	1	1.89%
6.5.0	1	1.89%
8.0.3	1	1.89%
7.0.1	1	1.89%
14.2.0	1	1.89%
14.2.1	1	1.89%
18.0.2	1	1.89%
6.0.4	1	1.89%
Other	0	0.00%
Gordano Messaging Suite (GMS) (34 servers)
Version	Number of Servers	Percent
Other	34	100.00%
Trend Micro (20 servers)
Version	Number of Servers	Percent
5.7	7	35.00%
5.18	5	25.00%
5.5	2	10.00%
7.5	2	10.00%
7.5ready	1	5.00%
8	1	5.00%
7.0	1	5.00%
7.1	1	5.00%
Other	0	0.00%
OpenVMS (13 servers)
Version	Number of Servers	Percent
8.4	7	53.85%
7.3	4	30.77%
8.3	1	7.69%
8.2	1	7.69%
Other	0	0.00%
VisNetic (5 servers)
Version	Number of Servers	Percent
9.3.2.0	3	60.00%
8.0.3	1	20.00%
5.0.1	1	20.00%
Other	0	0.00%
InterScan VirusWall (5 servers)
Version	Number of Servers	Percent
Other	5	100.00%
ModusMail (2 servers)
Version	Number of Servers	Percent
4.1.361.21	2	100.00%
Other	0	0.00%
Interscan (2 servers)
Version	Number of Servers	Percent
3.8-Build_3013	1	50.00%
3.81-Build_1022	1	50.00%
Other	0	0.00%
Mercury (2 servers)
Version	Number of Servers	Percent
1.48	1	50.00%
4	1	50.00%
Other	0	0.00%
MessageWall (2 servers)
Version	Number of Servers	Percent
1.0.8	2	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
4.4.5-GA	1	100.00%
Other	0	0.00%