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	816,739	100.0%
Number of Servers that didn't respond	133,221	16.31%
Server didn't open socket	131,441	16.09%
Server didn't provide banner	1,780	0.22%
Server provided banner	683,518	83.69%
Server banner identifies software in use	453,179	55.49%

As indicated by the above table, of the 816,739 servers queried, only 453,179 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	267,955	59.13%
Postfix	156,295	34.49%
Sendmail	15,360	3.39%
MailEnable	8,411	1.86%
MDaemon	1,865	0.41%
Microsoft	886	0.20%
CommuniGate Pro	569	0.13%
IMail	314	0.07%
XMail	312	0.07%
OpenSMTPD	291	0.06%
SurgeSMTP	235	0.05%
Qmail Toaster	164	0.04%
MagicMail	115	0.03%
Lotus Domino	93	0.02%
WinWebMail	82	0.02%
Merak	54	0.01%
Kerio	48	0.01%
Post.Office	47	0.01%
ArGoSoft	34	0.01%
GroupWise	25	0.01%
OpenVMS	5	0.00%
Gordano Messaging Suite (GMS)	5	0.00%
Trend Micro	4	0.00%
VisNetic	3	0.00%
ModusMail	2	0.00%
Mercury	1	0.00%
WebSTAR	1	0.00%
Mirapoint	1	0.00%
WebSTAR V	1	0.00%
InterScan VirusWall	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (267,955 servers)
Version	Number of Servers	Percent
4.96	182,994	68.29%
4.95	43,234	16.13%
4.94.2	11,475	4.28%
4.93	9,352	3.49%
4.92	3,631	1.36%
Other	17,269	6.44%
Postfix (156,295 servers)
Version	Number of Servers	Percent
Other	156,295	100.00%
Sendmail (15,360 servers)
Version	Number of Servers	Percent
8.16.1	5,272	34.32%
8.15.2	4,553	29.64%
8.14.7	1,514	9.86%
8.14.4	1,460	9.51%
8.13.8	699	4.55%
8.14.5	383	2.49%
8.17.1	298	1.94%
8.14.9	222	1.45%
8.13.1	213	1.39%
Other	746	4.86%
MailEnable (8,411 servers)
Version	Number of Servers	Percent
10.43--	3,532	41.99%
10.34--	540	6.42%
10.27--	331	3.94%
10.25--	262	3.11%
10.45--	203	2.41%
10.42--	194	2.31%
10.43-10.43-	164	1.95%
9.00--	143	1.70%
10.45--10.45	121	1.44%
10.43--10.43	99	1.18%
9.00--9.00	95	1.13%
10.31--	92	1.09%
10.45-10.45-	89	1.06%
Other	2,546	30.27%
MDaemon (1,865 servers)
Version	Number of Servers	Percent
23.0.1	210	11.26%
23.0.2	176	9.44%
13.5.1	101	5.42%
13.0.5	70	3.75%
11.0.3	65	3.49%
13.0.4	64	3.43%
11.0.0	57	3.06%
22.0.3	56	3.00%
21.5.2	50	2.68%
19.5.4	47	2.52%
16.5.2	44	2.36%
14.5.2	42	2.25%
23.0.0	42	2.25%
21.5.3	31	1.66%
12.5.6	31	1.66%
19.5.5	27	1.45%
12.5.4	23	1.23%
21.0.3	19	1.02%
Other	710	38.07%
Microsoft (886 servers)
Version	Number of Servers	Percent
6.0.3790.4675	233	26.30%
10.0.17763.1697	131	14.79%
8.5.9600.16384	113	12.75%
10.0.14393.4169	111	12.53%
7.5.7601.17514	56	6.32%
6.0.3790.3959	47	5.30%
5.0.2195.5329	44	4.97%
8.0.9200.16384	23	2.60%
5.0.2195.6713	19	2.14%
7.0.6002.18264	14	1.58%
10.0.14393.0	13	1.47%
10.0.20348.1	9	1.02%
10.0.17763.1	9	1.02%
Other	64	7.22%
CommuniGate Pro (569 servers)
Version	Number of Servers	Percent
6.2.15	59	10.37%
6.2.14	44	7.73%
6.3.17	29	5.10%
6.3.19	29	5.10%
6.3.18	26	4.57%
6.4.0	16	2.81%
6.1.20	16	2.81%
5.4.11	14	2.46%
6.0.9	11	1.93%
5.2.20	10	1.76%
6.3.14	9	1.58%
6.0.11	9	1.58%
6.1.18	9	1.58%
7.1.4	8	1.41%
6.2.16	8	1.41%
6.3.15	8	1.41%
6.1.16	8	1.41%
5.1.16	8	1.41%
7.1.1	7	1.23%
6.1.19	7	1.23%
6.2.12	6	1.05%
6.3.6	6	1.05%
6.3.13	6	1.05%
Other	216	37.96%
IMail (314 servers)
Version	Number of Servers	Percent
12.5.6.101	33	10.51%
12.5.8.41	26	8.28%
12.5.7.59	24	7.64%
9.23	21	6.69%
12.6.0.17	20	6.37%
12.5.8.58	19	6.05%
12.5.8.59	19	6.05%
12.5.6.105	15	4.78%
12.5.3.93	13	4.14%
12.4.1.15	13	4.14%
8.05	12	3.82%
8.22	10	3.18%
12.5.8.54	10	3.18%
12.3.0.100	8	2.55%
12.5.4.146	6	1.91%
8.15	6	1.91%
12.6.0.19	6	1.91%
12.5.5.115	5	1.59%
11.5	5	1.59%
8.00	4	1.27%
Other	39	12.42%
XMail (312 servers)
Version	Number of Servers	Percent
1.27	187	59.94%
1.22	78	25.00%
1.25	14	4.49%
1.26	13	4.17%
1.15	6	1.92%
1.24	6	1.92%
Other	8	2.56%
OpenSMTPD (291 servers)
Version	Number of Servers	Percent
Other	291	100.00%
SurgeSMTP (235 servers)
Version	Number of Servers	Percent
7.7c-1	47	20.00%
7.6j-1	22	9.36%
7.3o4-4	19	8.09%
7.6u-1	17	7.23%
7.5c-1	13	5.53%
7.3e2-2	13	5.53%
7.5a-1	8	3.40%
6.9c-1	8	3.40%
7.6d-1	8	3.40%
7.4o-1	7	2.98%
7.1e-1	7	2.98%
7.6h-2	7	2.98%
7.6s-1	5	2.13%
6.5a2-2	5	2.13%
7.4e-1	5	2.13%
6.7c-1	4	1.70%
7.3i2-2	3	1.28%
Other	37	15.74%
Qmail Toaster (164 servers)
Version	Number of Servers	Percent
1.03	81	49.39%
1.3	75	45.73%
1.03.5	6	3.66%
Other	2	1.22%
MagicMail (115 servers)
Version	Number of Servers	Percent
Other	115	100.00%
Lotus Domino (93 servers)
Version	Number of Servers	Percent
8.5.3	18	19.35%
8.5.3FP6	14	15.05%
7.0	5	5.38%
8.5.1	5	5.38%
6.5	3	3.23%
8.5.2FP2	3	3.23%
7.0.3	3	3.23%
7.0.2	3	3.23%
8.5.2FP1	2	2.15%
8.5.3FP1	2	2.15%
8.0	2	2.15%
6.5.1	2	2.15%
8.5.2	2	2.15%
8.5.3FP3	2	2.15%
8.5.2FP3	2	2.15%
8.0.1	2	2.15%
8.5.3FP5	2	2.15%
6.5.3	2	2.15%
7.0.4FP2	2	2.15%
7.0.3FP1	2	2.15%
8.5.3FP2	1	1.08%
8.5.3FP6HF1215	1	1.08%
6.5.4	1	1.08%
6.0.1	1	1.08%
8.5	1	1.08%
5.0.13a	1	1.08%
8.5.2FP4	1	1.08%
5.0.8	1	1.08%
7.5.1	1	1.08%
8.5.3FP4	1	1.08%
7.0.4FP1	1	1.08%
5.0.11	1	1.08%
8.5.1FP3	1	1.08%
6.5.2	1	1.08%
5.0.13	1	1.08%
Other	0	0.00%
WinWebMail (82 servers)
Version	Number of Servers	Percent
4.4.0.1	15	18.29%
4.2.0.1	15	18.29%
3.9.0.7	12	14.63%
4.1.0.1	4	4.88%
4.3.0.1	4	4.88%
3.8.1.3	4	4.88%
3.8.0.1	4	4.88%
3.8.6.1	4	4.88%
3.7.3.1	3	3.66%
4.0.0.1	3	3.66%
3.8.5.1	2	2.44%
4.5.0.1	2	2.44%
3.8.3.1	1	1.22%
1.0	1	1.22%
3.7.6.1	1	1.22%
3.9.3.1	1	1.22%
3.7.0.3	1	1.22%
3.9.2.1	1	1.22%
3.9.0.1	1	1.22%
3.8.1.5	1	1.22%
3.8.1.6	1	1.22%
3.7.5.1	1	1.22%
Other	0	0.00%
Merak (54 servers)
Version	Number of Servers	Percent
8.9.1	14	25.93%
8.0.3	14	25.93%
7.6.1	7	12.96%
8.3.8	5	9.26%
7.4.5	2	3.70%
8.5.0	2	3.70%
8.0.1	1	1.85%
8.9.2	1	1.85%
6.1.0	1	1.85%
9.0.3	1	1.85%
7.6.4	1	1.85%
4.2.1	1	1.85%
7.4.4	1	1.85%
6.0.8	1	1.85%
7.0.1	1	1.85%
5.8.2	1	1.85%
Other	0	0.00%
Kerio (48 servers)
Version	Number of Servers	Percent
6.7.3	10	20.83%
6.6.1	6	12.50%
6.6.2	6	12.50%
6.7.1	5	10.42%
6.5.2	5	10.42%
6.7.0	4	8.33%
5.7.9	2	4.17%
6.4.1	2	4.17%
6.5.1	2	4.17%
6.0.10	1	2.08%
6.3.1	1	2.08%
6.0.8	1	2.08%
6.7.2	1	2.08%
6.5.0	1	2.08%
6.3.0	1	2.08%
Other	0	0.00%
Post.Office (47 servers)
Version	Number of Servers	Percent
4.4	19	40.43%
4.2.2	9	19.15%
4.3	8	17.02%
3.5.3	3	6.38%
3.9.2	2	4.26%
4.2	2	4.26%
4.1.2.4	1	2.13%
4.1	1	2.13%
3.1.2	1	2.13%
4.2.1.1	1	2.13%
Other	0	0.00%
ArGoSoft (34 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	11	32.35%
1.8 (1.8.9.3)	5	14.71%
1.8 (1.8.9.5)	3	8.82%
1.8 (1.8.8.8)	2	5.88%
1.8 (1.8.7.3)	2	5.88%
1.8 (1.8.8.7)	2	5.88%
1.8 (1.8.9.2)	2	5.88%
1.8 (1.8.9.1)	2	5.88%
1.8 (1.8.6.1)	1	2.94%
1.8 (1.8.1.7)	1	2.94%
1.8 (1.8.8.4)	1	2.94%
1.8 (1.8.6.0)	1	2.94%
1.8 (1.8.9.4)	1	2.94%
Other	0	0.00%
GroupWise (25 servers)
Version	Number of Servers	Percent
18.2.1	4	16.00%
18.3.1	4	16.00%
18.4.2	3	12.00%
18.1.1	2	8.00%
18.5.0	2	8.00%
14.2.2	2	8.00%
14.2.1	1	4.00%
14.2.3	1	4.00%
18.0.0	1	4.00%
6.5.0	1	4.00%
18.4.1	1	4.00%
14.0.0	1	4.00%
18.2.0	1	4.00%
18.0.2	1	4.00%
Other	0	0.00%
OpenVMS (5 servers)
Version	Number of Servers	Percent
8.4	2	40.00%
7.3	2	40.00%
8.2	1	20.00%
Other	0	0.00%
Gordano Messaging Suite (GMS) (5 servers)
Version	Number of Servers	Percent
Other	5	100.00%
Trend Micro (4 servers)
Version	Number of Servers	Percent
5.18	3	75.00%
5.7	1	25.00%
Other	0	0.00%
VisNetic (3 servers)
Version	Number of Servers	Percent
9.3.2.0	2	66.67%
8.0.3	1	33.33%
Other	0	0.00%
ModusMail (2 servers)
Version	Number of Servers	Percent
4.1.361.21	2	100.00%
Other	0	0.00%
Mercury (1 servers)
Version	Number of Servers	Percent
1.48	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
4.4.5-GA	1	100.00%
Other	0	0.00%
WebSTAR V (1 servers)
Version	Number of Servers	Percent
5.3.2	1	100.00%
Other	0	0.00%
InterScan VirusWall (1 servers)
Version	Number of Servers	Percent
Other	1	100.00%