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	1,042,627	100.0%
Number of Servers that didn't respond	218,682	20.97%
Server didn't open socket	216,212	20.74%
Server didn't provide banner	2,470	0.24%
Server provided banner	823,945	79.03%
Server banner identifies software in use	512,332	49.14%

As indicated by the above table, of the 1,042,627 servers queried, only 512,332 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	286,701	55.96%
Postfix	192,104	37.50%
Sendmail	18,198	3.55%
MailEnable	9,392	1.83%
MDaemon	2,003	0.39%
Microsoft	1,008	0.20%
CommuniGate Pro	610	0.12%
OpenSMTPD	557	0.11%
XMail	381	0.07%
SurgeSMTP	287	0.06%
IMail	277	0.05%
Qmail Toaster	175	0.03%
MagicMail	149	0.03%
WinWebMail	142	0.03%
Lotus Domino	97	0.02%
Post.Office	56	0.01%
Kerio	50	0.01%
Merak	49	0.01%
ArGoSoft	32	0.01%
GroupWise	27	0.01%
Gordano Messaging Suite (GMS)	13	0.00%
OpenVMS	8	0.00%
InterScan VirusWall	5	0.00%
VisNetic	3	0.00%
Trend Micro	3	0.00%
ModusMail	2	0.00%
MessageWall	2	0.00%
Mirapoint	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (286,701 servers)
Version	Number of Servers	Percent
4.98.1	190,227	66.35%
4.96.2	33,715	11.76%
4.98.2	9,820	3.43%
4.96	7,608	2.65%
4.98	6,652	2.32%
4.97.1	6,015	2.10%
4.93	5,654	1.97%
4.95	4,851	1.69%
4.94.2	4,715	1.64%
Other	17,444	6.08%
Postfix (192,104 servers)
Version	Number of Servers	Percent
Other	192,104	100.00%
Sendmail (18,198 servers)
Version	Number of Servers	Percent
8.16.1	7,849	43.13%
8.15.2	3,743	20.57%
8.14.7	1,622	8.91%
8.14.4	1,386	7.62%
8.18.1	919	5.05%
8.13.8	652	3.58%
8.14.5	532	2.92%
8.14.9	237	1.30%
8.17.1.9	205	1.13%
8.17.1	184	1.01%
Other	869	4.78%
MailEnable (9,392 servers)
Version	Number of Servers	Percent
10.51--	1,812	19.29%
10.50--	1,362	14.50%
10.46--	980	10.43%
10.48--	452	4.81%
10.49--	357	3.80%
10.34--	278	2.96%
10.43--	178	1.90%
10.25--	173	1.84%
10.47--	171	1.82%
10.27--	169	1.80%
10.43-10.43-	152	1.62%
10.52--10.52	110	1.17%
10.48--10.48	96	1.02%
10.47--10.47	95	1.01%
Other	3,007	32.02%
MDaemon (2,003 servers)
Version	Number of Servers	Percent
25.0.2	359	17.92%
24.5.2	104	5.19%
19.5.4	92	4.59%
13.5.1	74	3.69%
11.0.0	69	3.44%
13.0.5	64	3.20%
11.0.3	61	3.05%
13.0.4	59	2.95%
16.5.2	43	2.15%
14.5.2	38	1.90%
23.0.2	29	1.45%
12.5.6	28	1.40%
23.0.1	26	1.30%
25.0.0	23	1.15%
24.0.1	22	1.10%
10.1.2	22	1.10%
21.5.2	21	1.05%
25.0.1	21	1.05%
Other	848	42.34%
Microsoft (1,008 servers)
Version	Number of Servers	Percent
6.0.3790.4675	261	25.89%
10.0.17763.1697	200	19.84%
10.0.14393.4169	117	11.61%
8.5.9600.16384	95	9.42%
7.5.7601.17514	65	6.45%
6.0.3790.3959	58	5.75%
5.0.2195.5329	47	4.66%
10.0.20348.1	41	4.07%
5.0.2195.6713	20	1.98%
8.0.9200.16384	18	1.79%
6.0.3790.1830	14	1.39%
Other	72	7.14%
CommuniGate Pro (610 servers)
Version	Number of Servers	Percent
6.2.15	60	9.84%
6.2.14	48	7.87%
6.3.39	41	6.72%
6.4.1	24	3.93%
6.3.20	21	3.44%
6.1.20	21	3.44%
6.4.0	18	2.95%
6.3.18	15	2.46%
6.3.17	14	2.30%
5.4.11	12	1.97%
6.0.11	11	1.80%
5.1.16	11	1.80%
5.2.20	10	1.64%
6.1.16	9	1.48%
6.5.1	8	1.31%
6.1.18	8	1.31%
6.0.9	8	1.31%
6.2.7	7	1.15%
6.3.6	7	1.15%
6.2.12	7	1.15%
7.1.8	7	1.15%
7.1.10	7	1.15%
Other	236	38.69%
OpenSMTPD (557 servers)
Version	Number of Servers	Percent
Other	557	100.00%
XMail (381 servers)
Version	Number of Servers	Percent
1.27	249	65.35%
1.22	88	23.10%
1.26	13	3.41%
1.25	11	2.89%
1.24	8	2.10%
Other	12	3.15%
SurgeSMTP (287 servers)
Version	Number of Servers	Percent
7.8k-1	57	19.86%
7.8a-1	25	8.71%
7.8g-1	21	7.32%
7.3o4-4	21	7.32%
7.5c-1	13	4.53%
7.7c-1	12	4.18%
7.8m-1	12	4.18%
7.6j-1	11	3.83%
7.8c2-2	11	3.83%
7.3e2-2	10	3.48%
8.0a-1	9	3.14%
6.9c-1	8	2.79%
7.1e-1	7	2.44%
7.5a-1	5	1.74%
7.2i-1	5	1.74%
6.5a2-2	5	1.74%
7.7i-1	4	1.39%
7.4e-1	4	1.39%
7.4m-1	3	1.05%
7.4o-1	3	1.05%
7.6u-1	3	1.05%
7.8h-10	3	1.05%
Other	35	12.20%
IMail (277 servers)
Version	Number of Servers	Percent
12.6.1.4	49	17.69%
9.23	21	7.58%
12.5.6.101	20	7.22%
12.5.8.59	18	6.50%
12.5.8.41	18	6.50%
12.5.3.93	13	4.69%
12.5.6.105	13	4.69%
8.22	12	4.33%
12.5.7.59	11	3.97%
12.5.8.58	10	3.61%
8.05	9	3.25%
12.3.0.100	6	2.17%
12.5.4.146	5	1.81%
12.5.5.115	5	1.81%
7.07	5	1.81%
11.5	5	1.81%
8.00	4	1.44%
12.6.0.20	4	1.44%
12.4.1.15	4	1.44%
11.03	4	1.44%
12.5.5.117	4	1.44%
12.5.8.54	3	1.08%
8.21	3	1.08%
12.6.0.17	3	1.08%
Other	28	10.11%
Qmail Toaster (175 servers)
Version	Number of Servers	Percent
1.03	116	66.29%
1.3	53	30.29%
1.03.5	4	2.29%
1.03.6	2	1.14%
Other	0	0.00%
MagicMail (149 servers)
Version	Number of Servers	Percent
Other	149	100.00%
WinWebMail (142 servers)
Version	Number of Servers	Percent
4.5.0.1	30	21.13%
4.4.0.1	17	11.97%
4.2.0.1	17	11.97%
3.8.1.3	16	11.27%
3.9.0.7	11	7.75%
3.8.0.1	6	4.23%
3.9.0.1	5	3.52%
4.1.0.1	5	3.52%
3.8.1.5	3	2.11%
3.7.1.1	3	2.11%
4.0.0.1	3	2.11%
3.7.3.1	3	2.11%
4.3.0.1	3	2.11%
3.9.3.1	2	1.41%
3.7.7.3	2	1.41%
3.9.2.1	2	1.41%
3.9.5.3	2	1.41%
3.8.6.1	2	1.41%
3.8.1.1	2	1.41%
Other	8	5.63%
Lotus Domino (97 servers)
Version	Number of Servers	Percent
8.5.3FP6	21	21.65%
8.5.3	14	14.43%
8.5.2	7	7.22%
8.5	5	5.15%
8.5.2FP1	4	4.12%
6.5	4	4.12%
8.5.1	4	4.12%
6.5.1	3	3.09%
8.5.3FP3	3	3.09%
7.0	2	2.06%
6.5.2	2	2.06%
6.5.3	2	2.06%
7.0.2	2	2.06%
7.0.4FP2	2	2.06%
7.5.1	2	2.06%
7.0.3	2	2.06%
8.0	2	2.06%
8.0.1	2	2.06%
8.5.3FP2	1	1.03%
8.5.3FP6HF1215	1	1.03%
6.5.4	1	1.03%
6.0.1	1	1.03%
5.0.13a	1	1.03%
6.0	1	1.03%
5.0.8	1	1.03%
6.5.5	1	1.03%
8.5.3FP1	1	1.03%
5.0.5	1	1.03%
8.5.3FP5	1	1.03%
8.5.1FP5	1	1.03%
6.6.6	1	1.03%
7.0.3FP1	1	1.03%
Other	0	0.00%
Post.Office (56 servers)
Version	Number of Servers	Percent
4.4	25	44.64%
4.2.2	8	14.29%
4.3	5	8.93%
3.5.3	5	8.93%
4.1.2.4	4	7.14%
3.5.1	3	5.36%
3.9.2	2	3.57%
4.2	1	1.79%
3.1.2	1	1.79%
4.2.1.1	1	1.79%
4.2.1.3	1	1.79%
Other	0	0.00%
Kerio (50 servers)
Version	Number of Servers	Percent
6.7.3	14	28.00%
6.6.1	7	14.00%
6.6.2	5	10.00%
6.7.0	5	10.00%
6.5.2	4	8.00%
6.7.1	3	6.00%
6.7.2	3	6.00%
6.5.1	2	4.00%
6.6.0	2	4.00%
6.4.1	1	2.00%
6.0.8	1	2.00%
5.7.6	1	2.00%
6.5.0	1	2.00%
6.3.0	1	2.00%
Other	0	0.00%
Merak (49 servers)
Version	Number of Servers	Percent
8.9.1	14	28.57%
8.0.3	14	28.57%
7.6.1	8	16.33%
7.4.5	2	4.08%
8.3.8	2	4.08%
6.0.8	2	4.08%
8.0.1	1	2.04%
8.9.2	1	2.04%
6.1.0	1	2.04%
7.5.2	1	2.04%
7.6.0	1	2.04%
7.4.4	1	2.04%
5.8.2	1	2.04%
Other	0	0.00%
ArGoSoft (32 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	11	34.38%
1.8 (1.8.9.3)	5	15.62%
1.8 (1.8.9.5)	4	12.50%
1.8 (1.8.7.3)	2	6.25%
1.8 (1.8.9.1)	2	6.25%
1.8 (1.8.8.7)	2	6.25%
1.8 (1.8.9.2)	2	6.25%
1.8 (1.8.8.8)	1	3.12%
1.8 (1.8.3.5)	1	3.12%
1.8 (1.8.9.4)	1	3.12%
1.8 (1.8.8.9)	1	3.12%
Other	0	0.00%
GroupWise (27 servers)
Version	Number of Servers	Percent
24.4.0	7	25.93%
18.3.1	3	11.11%
18.2.1	3	11.11%
24.1.0	2	7.41%
18.5.0	2	7.41%
24.3.0	2	7.41%
24.2.0	2	7.41%
14.2.1	1	3.70%
7.0.3	1	3.70%
18.4.1	1	3.70%
18.2.0	1	3.70%
18.1.1	1	3.70%
14.0.0	1	3.70%
Other	0	0.00%
Gordano Messaging Suite (GMS) (13 servers)
Version	Number of Servers	Percent
Other	13	100.00%
OpenVMS (8 servers)
Version	Number of Servers	Percent
8.4	5	62.50%
7.3	3	37.50%
Other	0	0.00%
InterScan VirusWall (5 servers)
Version	Number of Servers	Percent
Other	5	100.00%
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%
Trend Micro (3 servers)
Version	Number of Servers	Percent
5.18	2	66.67%
5.5	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%
MessageWall (2 servers)
Version	Number of Servers	Percent
1.0.8	2	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%