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	657,418	100.0%
Number of Servers that didn't respond	164,697	25.05%
Server didn't open socket	163,295	24.84%
Server didn't provide banner	1,402	0.21%
Server provided banner	492,721	74.95%
Server banner identifies software in use	330,160	50.22%

As indicated by the above table, of the 657,418 servers queried, only 330,160 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	198,567	60.14%
Postfix	109,993	33.32%
Sendmail	12,350	3.74%
MailEnable	5,990	1.81%
MDaemon	1,169	0.35%
Microsoft	519	0.16%
CommuniGate Pro	334	0.10%
XMail	222	0.07%
IMail	214	0.06%
OpenSMTPD	182	0.06%
SurgeSMTP	170	0.05%
Qmail Toaster	109	0.03%
MagicMail	90	0.03%
Lotus Domino	53	0.02%
WinWebMail	45	0.01%
Merak	40	0.01%
Kerio	36	0.01%
Post.Office	30	0.01%
ArGoSoft	20	0.01%
GroupWise	12	0.00%
OpenVMS	4	0.00%
Trend Micro	3	0.00%
ModusMail	2	0.00%
VisNetic	2	0.00%
Gordano Messaging Suite (GMS)	1	0.00%
Mercury	1	0.00%
WebSTAR	1	0.00%
Mirapoint	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (198,567 servers)
Version	Number of Servers	Percent
4.96.2	146,647	73.85%
4.96	8,641	4.35%
4.97.1	7,944	4.00%
4.95	7,412	3.73%
4.93	5,700	2.87%
4.94.2	4,227	2.13%
4.96.1	4,207	2.12%
4.92	2,361	1.19%
Other	11,428	5.76%
Postfix (109,993 servers)
Version	Number of Servers	Percent
Other	109,993	100.00%
Sendmail (12,350 servers)
Version	Number of Servers	Percent
8.16.1	4,993	40.43%
8.15.2	3,355	27.17%
8.14.7	1,036	8.39%
8.14.4	941	7.62%
8.13.8	487	3.94%
8.14.5	272	2.20%
8.14.9	178	1.44%
8.17.1	175	1.42%
8.13.1	154	1.25%
8.17.2	129	1.04%
Other	630	5.10%
MailEnable (5,990 servers)
Version	Number of Servers	Percent
10.46--	2,501	41.75%
10.34--	289	4.82%
10.43--	216	3.61%
10.27--	177	2.95%
10.25--	167	2.79%
10.47--	135	2.25%
10.43-10.43-	117	1.95%
10.47--10.47	110	1.84%
10.48--	108	1.80%
10.42--	100	1.67%
9.00--9.00	84	1.40%
9.00--	81	1.35%
10.48--10.48	79	1.32%
10.47-10.47-	75	1.25%
Other	1,751	29.23%
MDaemon (1,169 servers)
Version	Number of Servers	Percent
23.5.3	127	10.86%
13.5.1	65	5.56%
23.5.2	61	5.22%
23.5.1	55	4.70%
13.0.5	45	3.85%
11.0.3	41	3.51%
11.0.0	40	3.42%
13.0.4	36	3.08%
21.5.4	35	2.99%
19.5.4	33	2.82%
23.5.0	30	2.57%
14.5.2	29	2.48%
23.0.1	27	2.31%
16.5.2	26	2.22%
12.5.6	24	2.05%
23.0.2	24	2.05%
21.5.2	20	1.71%
22.0.3	19	1.63%
19.5.5	15	1.28%
10.1.2	13	1.11%
Other	404	34.56%
Microsoft (519 servers)
Version	Number of Servers	Percent
6.0.3790.4675	127	24.47%
10.0.17763.1697	98	18.88%
10.0.14393.4169	73	14.07%
8.5.9600.16384	63	12.14%
7.5.7601.17514	35	6.74%
5.0.2195.5329	26	5.01%
6.0.3790.3959	26	5.01%
5.0.2195.6713	14	2.70%
8.0.9200.16384	7	1.35%
7.0.6002.18222	6	1.16%
10.0.17763.1	6	1.16%
Other	38	7.32%
CommuniGate Pro (334 servers)
Version	Number of Servers	Percent
6.2.15	36	10.78%
6.2.14	28	8.38%
6.4.1	15	4.49%
6.1.20	13	3.89%
6.3.20	12	3.59%
6.3.18	11	3.29%
6.0.9	10	2.99%
6.3.17	8	2.40%
5.2.20	7	2.10%
6.3.6	7	2.10%
6.0.11	7	2.10%
6.1.18	7	2.10%
5.4.11	6	1.80%
6.1.16	6	1.80%
6.1.19	6	1.80%
6.3.14	5	1.50%
5.1.7	5	1.50%
6.3.9	4	1.20%
6.2.12	4	1.20%
5.2.3	4	1.20%
5.2.13	4	1.20%
6.2.8	4	1.20%
5.1.16	4	1.20%
6.2.16	4	1.20%
Other	117	35.03%
XMail (222 servers)
Version	Number of Servers	Percent
1.27	139	62.61%
1.22	51	22.97%
1.26	9	4.05%
1.25	9	4.05%
1.24	4	1.80%
1.15	3	1.35%
Other	7	3.15%
IMail (214 servers)
Version	Number of Servers	Percent
12.6.1.4	33	15.42%
9.23	19	8.88%
12.5.8.59	16	7.48%
12.5.8.41	12	5.61%
12.5.7.59	11	5.14%
12.5.6.101	11	5.14%
12.5.3.93	10	4.67%
12.5.6.105	10	4.67%
8.22	8	3.74%
12.5.8.58	8	3.74%
8.05	7	3.27%
12.4.1.15	7	3.27%
8.15	6	2.80%
12.3.0.100	6	2.80%
12.5.5.115	5	2.34%
12.6.0.17	5	2.34%
12.5.4.146	4	1.87%
11.5	4	1.87%
12.5.8.54	3	1.40%
6.04	3	1.40%
10.02	3	1.40%
12.6.0.20	3	1.40%
5.05	3	1.40%
12.5.5.117	3	1.40%
8.00	3	1.40%
Other	11	5.14%
OpenSMTPD (182 servers)
Version	Number of Servers	Percent
Other	182	100.00%
SurgeSMTP (170 servers)
Version	Number of Servers	Percent
7.8a-1	21	12.35%
7.7c-1	14	8.24%
7.3o4-4	13	7.65%
7.7i-1	12	7.06%
7.3e2-2	10	5.88%
7.6j-1	9	5.29%
7.5a-1	7	4.12%
7.5c-1	7	4.12%
6.9c-1	6	3.53%
7.1e-1	5	2.94%
7.6u-1	5	2.94%
7.8b-2	4	2.35%
7.7g-1	4	2.35%
7.4e-1	4	2.35%
7.4o-1	3	1.76%
7.7h-3	3	1.76%
6.5a2-2	3	1.76%
7.6d-1	3	1.76%
7.6h-2	3	1.76%
7.3i2-2	2	1.18%
7.7b-3	2	1.18%
7.3c3-3	2	1.18%
7.6s-1	2	1.18%
7.8b-4	2	1.18%
7.8b-8	2	1.18%
7.3n-1	2	1.18%
3.9e-1	2	1.18%
6.7c-1	2	1.18%
Other	16	9.41%
Qmail Toaster (109 servers)
Version	Number of Servers	Percent
1.03	59	54.13%
1.3	46	42.20%
1.03.5	3	2.75%
Other	1	0.92%
MagicMail (90 servers)
Version	Number of Servers	Percent
Other	90	100.00%
Lotus Domino (53 servers)
Version	Number of Servers	Percent
8.5.3FP6	12	22.64%
8.5.3	9	16.98%
7.0	4	7.55%
8.5.2FP1	2	3.77%
8.5.3FP1	2	3.77%
7.0.3	2	3.77%
8.5.1	2	3.77%
6.5.3	2	3.77%
7.0.2	2	3.77%
8.5	1	1.89%
6.5.4	1	1.89%
6.0.1	1	1.89%
8.5.1FP5	1	1.89%
8.5.2	1	1.89%
5.0.8	1	1.89%
8.5.3FP3	1	1.89%
8.0.1	1	1.89%
8.5.3FP4	1	1.89%
7.0.4FP1	1	1.89%
8.0	1	1.89%
8.5.2FP2	1	1.89%
6.5.2	1	1.89%
8.5.3FP5	1	1.89%
7.0.3FP1	1	1.89%
6.5	1	1.89%
Other	0	0.00%
WinWebMail (45 servers)
Version	Number of Servers	Percent
4.4.0.1	8	17.78%
4.2.0.1	8	17.78%
3.9.0.7	6	13.33%
4.5.0.1	5	11.11%
3.8.0.1	3	6.67%
3.8.1.3	3	6.67%
3.8.6.1	2	4.44%
4.3.0.1	2	4.44%
1.0	1	2.22%
3.7.6.1	1	2.22%
3.9.3.1	1	2.22%
3.9.2.1	1	2.22%
3.9.0.1	1	2.22%
3.7.3.1	1	2.22%
3.8.1.5	1	2.22%
4.0.0.1	1	2.22%
Other	0	0.00%
Merak (40 servers)
Version	Number of Servers	Percent
8.9.1	12	30.00%
8.0.3	8	20.00%
7.6.1	7	17.50%
8.3.8	3	7.50%
8.0.1	1	2.50%
8.9.2	1	2.50%
8.3.6	1	2.50%
6.1.0	1	2.50%
7.4.5	1	2.50%
8.5.0	1	2.50%
4.2.1	1	2.50%
7.6.0	1	2.50%
6.0.8	1	2.50%
5.8.2	1	2.50%
Other	0	0.00%
Kerio (36 servers)
Version	Number of Servers	Percent
6.7.3	7	19.44%
6.7.0	6	16.67%
6.6.1	5	13.89%
6.6.2	4	11.11%
6.7.1	3	8.33%
6.5.2	3	8.33%
5.7.9	2	5.56%
6.7.2	2	5.56%
6.4.1	1	2.78%
6.0.10	1	2.78%
6.0.8	1	2.78%
6.5.1	1	2.78%
Other	0	0.00%
Post.Office (30 servers)
Version	Number of Servers	Percent
4.4	11	36.67%
4.2.2	7	23.33%
4.3	6	20.00%
3.5.3	2	6.67%
4.2	1	3.33%
4.1.2.4	1	3.33%
3.9.2	1	3.33%
3.1.2	1	3.33%
Other	0	0.00%
ArGoSoft (20 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	7	35.00%
1.8 (1.8.9.3)	3	15.00%
1.8 (1.8.8.8)	2	10.00%
1.8 (1.8.8.7)	2	10.00%
1.8 (1.8.9.2)	2	10.00%
1.8 (1.8.6.1)	1	5.00%
1.8 (1.8.9.1)	1	5.00%
1.8 (1.8.9.4)	1	5.00%
1.8 (1.8.9.5)	1	5.00%
Other	0	0.00%
GroupWise (12 servers)
Version	Number of Servers	Percent
18.3.1	2	16.67%
6.5.7	1	8.33%
14.2.1	1	8.33%
14.2.3	1	8.33%
18.0.0	1	8.33%
18.2.1	1	8.33%
14.2.2	1	8.33%
18.2.0	1	8.33%
24.1.0	1	8.33%
18.0.2	1	8.33%
18.5.0	1	8.33%
Other	0	0.00%
OpenVMS (4 servers)
Version	Number of Servers	Percent
7.3	2	50.00%
8.4	1	25.00%
8.2	1	25.00%
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%
VisNetic (2 servers)
Version	Number of Servers	Percent
8.0.3	1	50.00%
9.3.2.0	1	50.00%
Other	0	0.00%
Gordano Messaging Suite (GMS) (1 servers)
Version	Number of Servers	Percent
Other	1	100.00%
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%