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	789,515	100.0%
Number of Servers that didn't respond	132,769	16.82%
Server didn't open socket	130,546	16.53%
Server didn't provide banner	2,223	0.28%
Server provided banner	656,746	83.18%
Server banner identifies software in use	435,761	55.19%

As indicated by the above table, of the 789,515 servers queried, only 435,761 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	259,559	59.56%
Postfix	147,295	33.80%
Sendmail	15,589	3.58%
MailEnable	8,268	1.90%
MDaemon	1,872	0.43%
Microsoft	886	0.20%
CommuniGate Pro	502	0.12%
IMail	332	0.08%
XMail	303	0.07%
OpenSMTPD	267	0.06%
SurgeSMTP	225	0.05%
Qmail Toaster	151	0.03%
MagicMail	104	0.02%
Lotus Domino	91	0.02%
WinWebMail	77	0.02%
Merak	56	0.01%
Kerio	51	0.01%
Post.Office	48	0.01%
ArGoSoft	28	0.01%
GroupWise	27	0.01%
Gordano Messaging Suite (GMS)	9	0.00%
OpenVMS	6	0.00%
VisNetic	5	0.00%
Trend Micro	3	0.00%
ModusMail	2	0.00%
Interscan	1	0.00%
Mercury	1	0.00%
Neon Mail Server	1	0.00%
Mirapoint	1	0.00%
InterScan VirusWall	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (259,559 servers)
Version	Number of Servers	Percent
4.95	191,480	73.77%
4.96	20,748	7.99%
4.94.2	13,799	5.32%
4.93	10,105	3.89%
4.92	3,803	1.47%
4.94	2,726	1.05%
Other	16,898	6.51%
Postfix (147,295 servers)
Version	Number of Servers	Percent
Other	147,295	100.00%
Sendmail (15,589 servers)
Version	Number of Servers	Percent
8.15.2	5,996	38.46%
8.16.1	3,725	23.90%
8.14.7	1,724	11.06%
8.14.4	1,561	10.01%
8.13.8	760	4.88%
8.14.5	423	2.71%
8.14.9	248	1.59%
8.17.1	247	1.58%
8.13.1	227	1.46%
Other	678	4.35%
MailEnable (8,268 servers)
Version	Number of Servers	Percent
10.42--	3,121	37.75%
10.34--	723	8.74%
10.27--	365	4.41%
10.25--	306	3.70%
10.43-10.43-	233	2.82%
10.43--	214	2.59%
10.43--10.43	175	2.12%
9.00--	166	2.01%
10.31--	101	1.22%
9.00--9.00	95	1.15%
Other	2,769	33.49%
MDaemon (1,872 servers)
Version	Number of Servers	Percent
22.0.3	275	14.69%
21.5.2	125	6.68%
13.5.1	116	6.20%
13.0.5	78	4.17%
11.0.3	65	3.47%
13.0.4	60	3.21%
11.0.0	59	3.15%
22.0.2	57	3.04%
14.5.2	47	2.51%
16.5.2	47	2.51%
19.5.4	44	2.35%
19.5.5	37	1.98%
12.5.6	33	1.76%
21.0.3	29	1.55%
10.0.0	24	1.28%
21.0.1	22	1.18%
21.5.1	21	1.12%
22.0.0	20	1.07%
21.5.0	19	1.01%
9.6.6	19	1.01%
Other	675	36.06%
Microsoft (886 servers)
Version	Number of Servers	Percent
6.0.3790.4675	263	29.68%
8.5.9600.16384	129	14.56%
10.0.14393.4169	106	11.96%
10.0.17763.1697	96	10.84%
7.5.7601.17514	67	7.56%
6.0.3790.3959	46	5.19%
5.0.2195.5329	44	4.97%
8.0.9200.16384	22	2.48%
5.0.2195.6713	17	1.92%
7.0.6002.18264	13	1.47%
10.0.17763.1	11	1.24%
10.0.14393.0	10	1.13%
Other	62	7.00%
CommuniGate Pro (502 servers)
Version	Number of Servers	Percent
6.2.14	54	10.76%
6.2.15	47	9.36%
6.1.20	22	4.38%
6.3.17	16	3.19%
6.1.16	14	2.79%
6.3.14	13	2.59%
6.0.11	12	2.39%
6.3.16	12	2.39%
6.1.18	12	2.39%
6.0.9	12	2.39%
5.2.20	11	2.19%
5.4.11	10	1.99%
6.2.12	9	1.79%
6.3.6	8	1.59%
7.1.1	7	1.39%
6.2.16	7	1.39%
6.3.15	7	1.39%
6.3.13	7	1.39%
6.1.19	6	1.20%
Other	216	43.03%
IMail (332 servers)
Version	Number of Servers	Percent
12.5.8.41	40	12.05%
12.5.6.101	30	9.04%
12.5.7.59	29	8.73%
12.6.0.17	24	7.23%
9.23	23	6.93%
12.5.8.58	18	5.42%
12.4.1.15	15	4.52%
12.5.6.105	14	4.22%
8.05	13	3.92%
12.5.8.59	12	3.61%
12.5.3.93	11	3.31%
8.15	11	3.31%
8.22	9	2.71%
12.5.8.54	9	2.71%
12.3.0.100	9	2.71%
12.5.4.146	6	1.81%
10.02	6	1.81%
12.5.5.117	5	1.51%
12.5.5.115	4	1.20%
11.5	4	1.20%
Other	40	12.05%
XMail (303 servers)
Version	Number of Servers	Percent
1.27	183	60.40%
1.22	74	24.42%
1.25	14	4.62%
1.26	13	4.29%
1.24	7	2.31%
1.15	6	1.98%
Other	6	1.98%
OpenSMTPD (267 servers)
Version	Number of Servers	Percent
Other	267	100.00%
SurgeSMTP (225 servers)
Version	Number of Servers	Percent
7.6j-1	35	15.56%
7.3o4-4	22	9.78%
7.6u-1	18	8.00%
7.3e2-2	15	6.67%
7.5c-1	14	6.22%
7.6s-1	13	5.78%
7.5a-1	9	4.00%
7.6h-2	9	4.00%
7.4o-1	8	3.56%
7.1e-1	8	3.56%
7.6d-1	7	3.11%
6.5a2-2	5	2.22%
7.6m-1	5	2.22%
7.4e-1	4	1.78%
7.6q-1	3	1.33%
3.9e-1	3	1.33%
6.7c-1	3	1.33%
Other	44	19.56%
Qmail Toaster (151 servers)
Version	Number of Servers	Percent
1.03	75	49.67%
1.3	69	45.70%
1.03.5	6	3.97%
Other	1	0.66%
MagicMail (104 servers)
Version	Number of Servers	Percent
Other	104	100.00%
Lotus Domino (91 servers)
Version	Number of Servers	Percent
8.5.3	21	23.08%
8.5.3FP6	15	16.48%
7.0	5	5.49%
7.0.3	5	5.49%
8.5.2FP2	4	4.40%
8.5.1	4	4.40%
7.0.2	4	4.40%
6.5	3	3.30%
8.5.2FP1	2	2.20%
8.5.3FP1	2	2.20%
8.5.3FP4	2	2.20%
6.5.1	2	2.20%
8.5.1FP5	2	2.20%
8.5.2FP3	2	2.20%
7.0.4FP2	2	2.20%
7.0.3FP1	2	2.20%
8.5.3FP2	1	1.10%
8.5.3FP6HF1215	1	1.10%
8.0	1	1.10%
6.5.4	1	1.10%
6.0.1	1	1.10%
8.5.3FP5	1	1.10%
5.0.13a	1	1.10%
5.0.8	1	1.10%
7.0.4FP1	1	1.10%
5.0.11	1	1.10%
6.5.2	1	1.10%
6.5.4FP2	1	1.10%
6.5.3	1	1.10%
8.5.3FP3	1	1.10%
Other	0	0.00%
WinWebMail (77 servers)
Version	Number of Servers	Percent
4.4.0.1	16	20.78%
3.9.0.7	15	19.48%
4.2.0.1	11	14.29%
4.3.0.1	5	6.49%
3.8.6.1	5	6.49%
3.7.3.1	4	5.19%
3.8.1.3	4	5.19%
3.8.0.1	4	5.19%
3.8.5.1	2	2.60%
4.0.0.1	2	2.60%
4.1.0.1	2	2.60%
3.8.3.1	1	1.30%
1.0	1	1.30%
3.7.6.1	1	1.30%
3.9.2.1	1	1.30%
3.8.1.5	1	1.30%
3.8.1.6	1	1.30%
3.7.5.1	1	1.30%
Other	0	0.00%
Merak (56 servers)
Version	Number of Servers	Percent
8.0.3	15	26.79%
8.9.1	13	23.21%
7.6.1	7	12.50%
8.3.8	5	8.93%
7.4.5	2	3.57%
9.0.3	2	3.57%
8.0.1	1	1.79%
8.9.2	1	1.79%
8.3.6	1	1.79%
6.1.0	1	1.79%
4.2.1	1	1.79%
8.9.7	1	1.79%
7.6.0	1	1.79%
7.4.4	1	1.79%
6.0.8	1	1.79%
7.0.1	1	1.79%
8.9.0	1	1.79%
5.8.2	1	1.79%
Other	0	0.00%
Kerio (51 servers)
Version	Number of Servers	Percent
6.7.3	11	21.57%
6.7.0	7	13.73%
6.6.1	6	11.76%
6.7.1	5	9.80%
6.5.2	5	9.80%
6.6.2	5	9.80%
6.7.2	3	5.88%
5.7.9	2	3.92%
6.3.0	2	3.92%
6.5.1	2	3.92%
6.0.10	1	1.96%
6.0.8	1	1.96%
6.5.0	1	1.96%
Other	0	0.00%
Post.Office (48 servers)
Version	Number of Servers	Percent
4.4	18	37.50%
4.3	9	18.75%
4.2.2	8	16.67%
4.1.2.4	3	6.25%
3.5.3	3	6.25%
4.2	2	4.17%
4.2.1.1	2	4.17%
3.9.2	1	2.08%
4.1	1	2.08%
3.1.2	1	2.08%
Other	0	0.00%
ArGoSoft (28 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	8	28.57%
1.8 (1.8.9.3)	4	14.29%
1.8 (1.8.9.5)	3	10.71%
1.8 (1.8.8.8)	2	7.14%
1.8 (1.8.7.3)	2	7.14%
1.8 (1.8.8.7)	2	7.14%
1.8 (1.8.9.2)	2	7.14%
1.8 (1.8.8.4)	1	3.57%
1.8 (1.8.1.7)	1	3.57%
1.8 (1.8.6.0)	1	3.57%
1.8 (1.8.9.1)	1	3.57%
1.8 (1.8.9.4)	1	3.57%
Other	0	0.00%
GroupWise (27 servers)
Version	Number of Servers	Percent
18.3.1	5	18.52%
18.2.1	4	14.81%
18.1.1	2	7.41%
18.4.1	2	7.41%
18.4.0	2	7.41%
6.5.7	1	3.70%
14.2.1	1	3.70%
14.2.3	1	3.70%
18.0.0	1	3.70%
6.5.0	1	3.70%
14.2.0	1	3.70%
8.0.3	1	3.70%
14.0.0	1	3.70%
18.2.0	1	3.70%
18.4.2	1	3.70%
18.0.2	1	3.70%
14.2.2	1	3.70%
Other	0	0.00%
Gordano Messaging Suite (GMS) (9 servers)
Version	Number of Servers	Percent
Other	9	100.00%
OpenVMS (6 servers)
Version	Number of Servers	Percent
8.4	4	66.67%
7.3	2	33.33%
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%
Trend Micro (3 servers)
Version	Number of Servers	Percent
5.18	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%
Interscan (1 servers)
Version	Number of Servers	Percent
3.8-Build_3013	1	100.00%
Other	0	0.00%
Mercury (1 servers)
Version	Number of Servers	Percent
1.48	1	100.00%
Other	0	0.00%
Neon Mail Server (1 servers)
Version	Number of Servers	Percent
3.0.7	1	100.00%
Other	0	0.00%
Mirapoint (1 servers)
Version	Number of Servers	Percent
4.4.5-GA	1	100.00%
Other	0	0.00%
InterScan VirusWall (1 servers)
Version	Number of Servers	Percent
Other	1	100.00%