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	1,092,362	100.0%
Number of Servers that didn't respond	177,145	16.22%
Server didn't open socket	174,195	15.95%
Server didn't provide banner	2,950	0.27%
Server provided banner	915,217	83.78%
Server banner identifies software in use	587,797	53.81%

As indicated by the above table, of the 1,092,362 servers queried, only 587,797 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	347,635	59.14%
Postfix	197,828	33.66%
Sendmail	21,159	3.60%
MailEnable	11,878	2.02%
MDaemon	3,509	0.60%
Microsoft	1,867	0.32%
CommuniGate Pro	790	0.13%
IMail	626	0.11%
Qmail Toaster	497	0.08%
XMail	452	0.08%
SurgeSMTP	329	0.06%
OpenSMTPD	313	0.05%
Lotus Domino	183	0.03%
WinWebMail	173	0.03%
MagicMail	125	0.02%
Kerio	101	0.02%
Merak	91	0.02%
Post.Office	70	0.01%
ArGoSoft	56	0.01%
GroupWise	46	0.01%
Gordano Messaging Suite (GMS)	29	0.00%
Trend Micro	12	0.00%
OpenVMS	8	0.00%
VisNetic	7	0.00%
InterScan VirusWall	3	0.00%
ModusMail	2	0.00%
Interscan	2	0.00%
Mercury	2	0.00%
MessageWall	1	0.00%
WebSTAR V	1	0.00%
WebSTAR	1	0.00%
Mirapoint	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (347,635 servers)
Version	Number of Servers	Percent
4.93	248,233	71.41%
4.94	38,967	11.21%
4.91	13,495	3.88%
4.92	9,069	2.61%
4.92.3	6,546	1.88%
4.89	4,778	1.37%
4.93.0.4	3,926	1.13%
4.87	3,793	1.09%
4.84	3,713	1.07%
Other	15,115	4.35%
Postfix (197,828 servers)
Version	Number of Servers	Percent
Other	197,828	100.00%
Sendmail (21,159 servers)
Version	Number of Servers	Percent
8.15.2	10,366	48.99%
8.14.4	3,160	14.93%
8.14.7	2,258	10.67%
8.13.8	1,443	6.82%
8.14.5	1,267	5.99%
8.14.9	577	2.73%
8.13.1	410	1.94%
8.16.1	410	1.94%
8.14.3	289	1.37%
Other	979	4.63%
MailEnable (11,878 servers)
Version	Number of Servers	Percent
10.27--	3,431	28.89%
10.25--	2,048	17.24%
9.00--	413	3.48%
10.31--	411	3.46%
10.31-10.31-	262	2.21%
10.29--	233	1.96%
10.31--10.31	214	1.80%
10.30--	193	1.62%
9.16--	144	1.21%
10.12--	137	1.15%
9.00--9.00	128	1.08%
Other	4,264	35.90%
MDaemon (3,509 servers)
Version	Number of Servers	Percent
21.0.0	314	8.95%
13.5.1	242	6.90%
20.0.4	209	5.96%
19.5.5	197	5.61%
13.0.5	144	4.10%
20.0.3	138	3.93%
11.0.3	129	3.68%
13.0.4	121	3.45%
13.6.3	115	3.28%
11.0.0	114	3.25%
16.5.2	95	2.71%
12.5.6	76	2.17%
14.5.2	72	2.05%
19.5.4	65	1.85%
12.5.4	51	1.45%
10.1.2	40	1.14%
10.0.0	40	1.14%
15.0.3	39	1.11%
16.0.4	38	1.08%
Other	1,270	36.19%
Microsoft (1,867 servers)
Version	Number of Servers	Percent
6.0.3790.4675	684	36.64%
8.5.9600.16384	301	16.12%
7.5.7601.17514	187	10.02%
10.0.14393.4169	109	5.84%
6.0.3790.3959	99	5.30%
5.0.2195.5329	69	3.70%
10.0.14393.2608	69	3.70%
10.0.17763.1697	62	3.32%
8.0.9200.16384	48	2.57%
10.0.17763.1	41	2.20%
7.0.6002.18264	31	1.66%
5.0.2195.6713	26	1.39%
6.0.3790.1830	25	1.34%
5.0.2195.7381	22	1.18%
Other	94	5.03%
CommuniGate Pro (790 servers)
Version	Number of Servers	Percent
6.2.14	91	11.52%
6.2.15	76	9.62%
6.1.20	35	4.43%
6.2.12	28	3.54%
6.0.11	27	3.42%
5.3.13	25	3.16%
5.4.11	21	2.66%
6.1.16	21	2.66%
5.2.20	20	2.53%
6.1.18	19	2.41%
6.3.3	17	2.15%
6.0.9	14	1.77%
5.1.16	13	1.65%
6.1.9	10	1.27%
6.2.10	10	1.27%
6.3.6	10	1.27%
4.2.10	9	1.14%
6.2.13	9	1.14%
6.0.7	9	1.14%
6.3.4	9	1.14%
5.2.3	9	1.14%
Other	308	38.99%
IMail (626 servers)
Version	Number of Servers	Percent
12.5.8.41	110	17.57%
12.5.7.59	75	11.98%
12.5.6.101	66	10.54%
12.4.1.15	52	8.31%
8.22	38	6.07%
9.23	36	5.75%
12.5.3.93	28	4.47%
8.05	24	3.83%
12.5.5.115	22	3.51%
12.3.0.100	21	3.35%
8.15	21	3.35%
10.02	16	2.56%
12.5.6.105	16	2.56%
12.5.4.146	14	2.24%
12.5.5.117	10	1.60%
Other	77	12.30%
Qmail Toaster (497 servers)
Version	Number of Servers	Percent
1.3	372	74.85%
1.03	113	22.74%
1.03.5	7	1.41%
Other	5	1.01%
XMail (452 servers)
Version	Number of Servers	Percent
1.27	238	52.65%
1.22	144	31.86%
1.26	20	4.42%
1.25	20	4.42%
1.24	11	2.43%
1.15	5	1.11%
Other	14	3.10%
SurgeSMTP (329 servers)
Version	Number of Servers	Percent
7.3o4-4	41	12.46%
7.5a-1	39	11.85%
7.4o-1	38	11.55%
7.3e2-2	22	6.69%
7.1e-1	18	5.47%
7.4e-1	15	4.56%
7.5c-1	14	4.26%
6.5a2-2	14	4.26%
7.3i2-2	11	3.34%
6.7c-1	10	3.04%
7.2i-1	9	2.74%
7.5d-2	6	1.82%
7.5b-18	5	1.52%
7.4m-1	5	1.52%
3.9e-1	5	1.52%
7.2a-1	5	1.52%
7.5b-22	4	1.22%
6.9c-1	4	1.22%
Other	64	19.45%
OpenSMTPD (313 servers)
Version	Number of Servers	Percent
Other	313	100.00%
Lotus Domino (183 servers)
Version	Number of Servers	Percent
8.5.3	38	20.77%
8.5.3FP6	33	18.03%
8.5.1	11	6.01%
8.5.2	10	5.46%
7.0	7	3.83%
7.0.3	5	2.73%
7.0.2	5	2.73%
8.5.3FP5	4	2.19%
8.5.3FP1	4	2.19%
8.5	4	2.19%
8.5.2FP2	4	2.19%
8.5.2FP3	4	2.19%
8.5.2FP4HF759	3	1.64%
8.5.3FP4	3	1.64%
6.5.1	3	1.64%
8.5.1FP5	3	1.64%
6.5	2	1.09%
6.5.4	2	1.09%
8.5.2FP1	2	1.09%
5.0.13	2	1.09%
6.5.5	2	1.09%
8.0	2	1.09%
8.5.3FP3	2	1.09%
8.5.2FP4	2	1.09%
5.0.8	2	1.09%
7.0.3FP1	2	1.09%
7.5.1	2	1.09%
6.5.3	2	1.09%
Other	18	9.84%
WinWebMail (173 servers)
Version	Number of Servers	Percent
4.2.0.1	41	23.70%
3.9.0.7	26	15.03%
3.8.1.3	19	10.98%
4.3.0.1	11	6.36%
3.8.0.1	10	5.78%
4.1.0.1	7	4.05%
4.0.0.1	7	4.05%
3.8.6.1	6	3.47%
3.9.0.1	6	3.47%
3.7.6.1	5	2.89%
3.7.3.1	5	2.89%
3.8.1.1	4	2.31%
3.7.7.3	3	1.73%
1.0	3	1.73%
3.8.1.5	3	1.73%
3.8.5.1	3	1.73%
3.8.3.1	2	1.16%
3.9.3.1	2	1.16%
3.7.0.3	2	1.16%
3.9.2.1	2	1.16%
Other	6	3.47%
MagicMail (125 servers)
Version	Number of Servers	Percent
Other	125	100.00%
Kerio (101 servers)
Version	Number of Servers	Percent
6.7.3	21	20.79%
6.7.0	15	14.85%
6.7.2	12	11.88%
6.6.2	11	10.89%
6.6.1	10	9.90%
6.7.1	7	6.93%
6.5.2	5	4.95%
6.5.0	5	4.95%
6.3.1	2	1.98%
6.4.1	2	1.98%
5.7.9	2	1.98%
5.7.6	2	1.98%
6.5.1	2	1.98%
Other	5	4.95%
Merak (91 servers)
Version	Number of Servers	Percent
8.9.1	25	27.47%
8.0.3	23	25.27%
7.6.1	8	8.79%
7.4.5	5	5.49%
8.5.0	4	4.40%
8.3.8	4	4.40%
9.0.3	4	4.40%
7.6.0	2	2.20%
6.0.8	2	2.20%
8.0.1	1	1.10%
8.9.2	1	1.10%
8.3.6	1	1.10%
7.5.2	1	1.10%
6.1.0	1	1.10%
8.3.0	1	1.10%
4.2.1	1	1.10%
5.8.2	1	1.10%
8.9.7	1	1.10%
7.6.4	1	1.10%
7.4.4	1	1.10%
7.0.1	1	1.10%
8.9.0	1	1.10%
6.0.3	1	1.10%
Other	0	0.00%
Post.Office (70 servers)
Version	Number of Servers	Percent
4.4	17	24.29%
4.3	16	22.86%
4.2.2	13	18.57%
3.5.3	7	10.00%
4.1.2.4	4	5.71%
4.2.1.1	3	4.29%
3.9.2	2	2.86%
4.1.1	2	2.86%
3.5.1	1	1.43%
3.6.2	1	1.43%
4.1.0.3	1	1.43%
4.1	1	1.43%
3.1.2	1	1.43%
4.2	1	1.43%
Other	0	0.00%
ArGoSoft (56 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	15	26.79%
1.8 (1.8.9.3)	10	17.86%
1.8 (1.8.9.5)	8	14.29%
1.8 (1.8.8.8)	3	5.36%
1.8 (1.8.7.3)	3	5.36%
1.8 (1.8.8.9)	2	3.57%
1.8 (1.8.8.7)	2	3.57%
1.8 (1.8.9.2)	2	3.57%
1.8 (1.8.9.1)	2	3.57%
1.8 (1.8.6.1)	1	1.79%
1.8 (1.8.7.6)	1	1.79%
1.8 (1.8.5.8)	1	1.79%
1.8 (1.8.8.4)	1	1.79%
1.8 (1.8.2.1)	1	1.79%
1.8 (1.8.6.0)	1	1.79%
1.8 (1.8.1.7)	1	1.79%
1.8 (1.8.9.4)	1	1.79%
1.8 (1.8.2.5)	1	1.79%
Other	0	0.00%
GroupWise (46 servers)
Version	Number of Servers	Percent
18.1.1	9	19.57%
18.2.1	8	17.39%
18.2.0	6	13.04%
18.1.0	5	10.87%
14.2.0	3	6.52%
14.2.2	3	6.52%
18.3.0	2	4.35%
14.0.0	2	4.35%
14.2.3	2	4.35%
14.2.1	2	4.35%
6.5.7	1	2.17%
18.0.0	1	2.17%
18.0.2	1	2.17%
8.0.2	1	2.17%
Other	0	0.00%
Gordano Messaging Suite (GMS) (29 servers)
Version	Number of Servers	Percent
Other	29	100.00%
Trend Micro (12 servers)
Version	Number of Servers	Percent
5.18	6	50.00%
5.7	3	25.00%
5.5	2	16.67%
7.5ready	1	8.33%
Other	0	0.00%
OpenVMS (8 servers)
Version	Number of Servers	Percent
8.4	4	50.00%
7.3	3	37.50%
8.2	1	12.50%
Other	0	0.00%
VisNetic (7 servers)
Version	Number of Servers	Percent
9.3.2.0	4	57.14%
8.0.3	1	14.29%
6.2.2.0	1	14.29%
5.0.1	1	14.29%
Other	0	0.00%
InterScan VirusWall (3 servers)
Version	Number of Servers	Percent
Other	3	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%
3.8-Build_1080	1	50.00%
Other	0	0.00%
Mercury (2 servers)
Version	Number of Servers	Percent
1.48	1	50.00%
4.x	1	50.00%
Other	0	0.00%
MessageWall (1 servers)
Version	Number of Servers	Percent
1.0.8	1	100.00%
Other	0	0.00%
WebSTAR V (1 servers)
Version	Number of Servers	Percent
5.4.1	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%