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	1,100,168	100.0%
Number of Servers that didn't respond	223,341	20.30%
Server didn't open socket	220,688	20.06%
Server didn't provide banner	2,653	0.24%
Server provided banner	876,827	79.70%
Server banner identifies software in use	549,567	49.95%

As indicated by the above table, of the 1,100,168 servers queried, only 549,567 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	302,529	55.05%
Postfix	211,702	38.52%
Sendmail	18,979	3.45%
MailEnable	9,894	1.80%
MDaemon	2,188	0.40%
Microsoft	1,109	0.20%
CommuniGate Pro	681	0.12%
OpenSMTPD	605	0.11%
XMail	401	0.07%
SurgeSMTP	299	0.05%
IMail	298	0.05%
Qmail Toaster	181	0.03%
WinWebMail	169	0.03%
MagicMail	154	0.03%
Lotus Domino	104	0.02%
Post.Office	60	0.01%
Merak	55	0.01%
Kerio	51	0.01%
ArGoSoft	36	0.01%
GroupWise	27	0.00%
Gordano Messaging Suite (GMS)	15	0.00%
OpenVMS	8	0.00%
InterScan VirusWall	7	0.00%
VisNetic	4	0.00%
Trend Micro	3	0.00%
ModusMail	2	0.00%
MessageWall	2	0.00%
WebSTAR	1	0.00%
Mirapoint	1	0.00%
WebSTAR V	1	0.00%
Neon Mail Server	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (302,529 servers)
Version	Number of Servers	Percent
4.96.2	153,480	50.73%
4.98	93,284	30.83%
4.96	9,334	3.09%
4.97.1	8,909	2.94%
4.93	6,593	2.18%
4.95	5,678	1.88%
4.94.2	5,468	1.81%
Other	19,783	6.54%
Postfix (211,702 servers)
Version	Number of Servers	Percent
Other	211,702	100.00%
Sendmail (18,979 servers)
Version	Number of Servers	Percent
8.16.1	7,583	39.95%
8.15.2	4,332	22.83%
8.14.7	1,769	9.32%
8.14.4	1,486	7.83%
8.18.1	784	4.13%
8.13.8	720	3.79%
8.14.5	648	3.41%
8.14.9	245	1.29%
8.17.1	231	1.22%
8.17.1.9	205	1.08%
Other	976	5.14%
MailEnable (9,894 servers)
Version	Number of Servers	Percent
10.49--	3,335	33.71%
10.46--	1,096	11.08%
10.48--	645	6.52%
10.34--	306	3.09%
10.43--	215	2.17%
10.47--	204	2.06%
10.25--	202	2.04%
10.27--	177	1.79%
10.43-10.43-	160	1.62%
10.48--10.48	144	1.46%
10.47--10.47	112	1.13%
10.49--10.49	111	1.12%
10.49-10.49-	106	1.07%
9.00--	104	1.05%
10.42--	103	1.04%
10.47-10.47-	102	1.03%
10.48-10.48-	101	1.02%
Other	2,671	27.00%
MDaemon (2,188 servers)
Version	Number of Servers	Percent
24.5.2	417	19.06%
19.5.4	95	4.34%
13.5.1	85	3.88%
11.0.0	75	3.43%
11.0.3	72	3.29%
13.0.5	68	3.11%
13.0.4	68	3.11%
24.5.1	56	2.56%
14.5.2	45	2.06%
16.5.2	45	2.06%
12.5.6	34	1.55%
23.0.2	34	1.55%
23.0.1	34	1.55%
24.5.0	30	1.37%
23.5.3	30	1.37%
10.1.2	27	1.23%
24.0.1	25	1.14%
21.5.2	25	1.14%
24.0.2	24	1.10%
Other	899	41.09%
Microsoft (1,109 servers)
Version	Number of Servers	Percent
6.0.3790.4675	282	25.43%
10.0.17763.1697	216	19.48%
10.0.14393.4169	130	11.72%
8.5.9600.16384	119	10.73%
7.5.7601.17514	75	6.76%
6.0.3790.3959	64	5.77%
5.0.2195.5329	45	4.06%
10.0.20348.1	40	3.61%
8.0.9200.16384	20	1.80%
5.0.2195.6713	20	1.80%
6.0.3790.1830	13	1.17%
10.0.17763.1	12	1.08%
Other	73	6.58%
CommuniGate Pro (681 servers)
Version	Number of Servers	Percent
6.2.15	64	9.40%
6.2.14	41	6.02%
6.4.1	32	4.70%
6.1.20	25	3.67%
6.3.20	24	3.52%
6.4.0	23	3.38%
6.3.17	19	2.79%
6.3.18	18	2.64%
6.3.39	17	2.50%
5.4.11	13	1.91%
6.0.11	12	1.76%
6.0.9	12	1.76%
5.2.20	12	1.76%
5.1.16	12	1.76%
6.1.16	11	1.62%
6.3.19	10	1.47%
6.2.12	9	1.32%
6.3.16	9	1.32%
6.3.14	8	1.17%
6.3.37	8	1.17%
6.3.38	8	1.17%
7.1.10	8	1.17%
6.1.18	8	1.17%
6.1.17	7	1.03%
5.2.3	7	1.03%
6.3.6	7	1.03%
7.1.8	7	1.03%
Other	250	36.71%
OpenSMTPD (605 servers)
Version	Number of Servers	Percent
Other	605	100.00%
XMail (401 servers)
Version	Number of Servers	Percent
1.27	264	65.84%
1.22	91	22.69%
1.26	15	3.74%
1.25	10	2.49%
1.24	9	2.24%
Other	12	2.99%
SurgeSMTP (299 servers)
Version	Number of Servers	Percent
7.8k-1	39	13.04%
7.8a-1	30	10.03%
7.3o4-4	24	8.03%
7.8g-1	20	6.69%
7.8c2-2	18	6.02%
7.7c-1	16	5.35%
7.6j-1	13	4.35%
7.5c-1	13	4.35%
7.3e2-2	10	3.34%
7.7i-1	10	3.34%
7.1e-1	9	3.01%
6.9c-1	8	2.68%
7.5a-1	6	2.01%
7.4o-1	6	2.01%
6.5a2-2	6	2.01%
7.6u-1	5	1.67%
7.2i-1	5	1.67%
7.4e-1	5	1.67%
7.8h-10	4	1.34%
7.4m-1	3	1.00%
7.6h-2	3	1.00%
7.8l-7	3	1.00%
Other	43	14.38%
IMail (298 servers)
Version	Number of Servers	Percent
12.6.1.4	54	18.12%
9.23	23	7.72%
12.5.6.101	21	7.05%
12.5.8.59	18	6.04%
12.5.8.41	18	6.04%
8.22	14	4.70%
12.5.7.59	14	4.70%
12.5.6.105	14	4.70%
12.5.3.93	13	4.36%
12.5.8.58	10	3.36%
8.05	10	3.36%
12.5.5.115	6	2.01%
7.07	6	2.01%
12.3.0.100	6	2.01%
12.5.5.117	6	2.01%
12.5.4.146	5	1.68%
11.5	5	1.68%
12.5.8.54	4	1.34%
8.00	4	1.34%
12.4.1.15	4	1.34%
10.02	4	1.34%
8.21	3	1.01%
6.04	3	1.01%
12.6.0.17	3	1.01%
11.03	3	1.01%
12.6.0.20	3	1.01%
Other	24	8.05%
Qmail Toaster (181 servers)
Version	Number of Servers	Percent
1.03	118	65.19%
1.3	57	31.49%
1.03.5	4	2.21%
1.03.6	2	1.10%
Other	0	0.00%
WinWebMail (169 servers)
Version	Number of Servers	Percent
4.5.0.1	34	20.12%
4.2.0.1	21	12.43%
3.8.1.3	20	11.83%
4.4.0.1	20	11.83%
3.9.0.7	14	8.28%
3.8.0.1	6	3.55%
4.3.0.1	6	3.55%
3.9.0.1	5	2.96%
4.0.0.1	5	2.96%
4.1.0.1	4	2.37%
3.7.3.1	4	2.37%
3.7.7.3	3	1.78%
3.8.1.5	3	1.78%
3.7.1.1	3	1.78%
3.8.6.1	3	1.78%
3.9.3.1	2	1.18%
3.8.5.1	2	1.18%
3.9.2.1	2	1.18%
3.9.5.3	2	1.18%
3.8.1.1	2	1.18%
Other	8	4.73%
MagicMail (154 servers)
Version	Number of Servers	Percent
Other	154	100.00%
Lotus Domino (104 servers)
Version	Number of Servers	Percent
8.5.3FP6	18	17.31%
8.5.3	18	17.31%
8.5.2	7	6.73%
8.5.1	6	5.77%
7.0	5	4.81%
8.5.2FP1	4	3.85%
8.5	4	3.85%
6.5	3	2.88%
6.5.1	3	2.88%
8.5.3FP3	3	2.88%
7.0.2	3	2.88%
6.5.2	2	1.92%
6.5.3	2	1.92%
7.0.4FP2	2	1.92%
7.5.1	2	1.92%
8.0.1	2	1.92%
7.0.3	2	1.92%
8.0	2	1.92%
Other	16	15.38%
Post.Office (60 servers)
Version	Number of Servers	Percent
4.4	28	46.67%
4.2.2	9	15.00%
4.3	5	8.33%
3.5.3	5	8.33%
4.1.2.4	4	6.67%
3.5.1	3	5.00%
3.9.2	2	3.33%
4.2	1	1.67%
3.1.2	1	1.67%
4.2.1.1	1	1.67%
4.2.1.3	1	1.67%
Other	0	0.00%
Merak (55 servers)
Version	Number of Servers	Percent
8.9.1	17	30.91%
8.0.3	14	25.45%
7.6.1	8	14.55%
8.3.8	5	9.09%
7.4.5	2	3.64%
6.0.8	2	3.64%
8.0.1	1	1.82%
8.9.2	1	1.82%
6.1.0	1	1.82%
7.5.2	1	1.82%
7.6.0	1	1.82%
7.4.4	1	1.82%
5.8.2	1	1.82%
Other	0	0.00%
Kerio (51 servers)
Version	Number of Servers	Percent
6.7.3	12	23.53%
6.6.1	8	15.69%
6.7.0	7	13.73%
6.6.2	4	7.84%
6.5.2	4	7.84%
6.7.1	3	5.88%
6.7.2	3	5.88%
6.5.1	2	3.92%
6.6.0	2	3.92%
5.7.9	1	1.96%
6.4.1	1	1.96%
6.0.8	1	1.96%
5.7.6	1	1.96%
6.5.0	1	1.96%
6.3.0	1	1.96%
Other	0	0.00%
ArGoSoft (36 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	14	38.89%
1.8 (1.8.9.3)	5	13.89%
1.8 (1.8.9.5)	5	13.89%
1.8 (1.8.7.3)	2	5.56%
1.8 (1.8.9.1)	2	5.56%
1.8 (1.8.8.7)	2	5.56%
1.8 (1.8.9.2)	2	5.56%
1.8 (1.8.8.8)	1	2.78%
1.8 (1.8.3.5)	1	2.78%
1.8 (1.8.9.4)	1	2.78%
1.8 (1.8.8.9)	1	2.78%
Other	0	0.00%
GroupWise (27 servers)
Version	Number of Servers	Percent
18.3.1	4	14.81%
24.4.0	4	14.81%
18.2.1	3	11.11%
24.2.0	3	11.11%
18.5.0	2	7.41%
24.3.0	2	7.41%
18.2.0	2	7.41%
7.0.4	1	3.70%
14.2.1	1	3.70%
24.1.0	1	3.70%
14.2.3	1	3.70%
18.4.1	1	3.70%
18.1.1	1	3.70%
14.0.0	1	3.70%
Other	0	0.00%
Gordano Messaging Suite (GMS) (15 servers)
Version	Number of Servers	Percent
Other	15	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 (7 servers)
Version	Number of Servers	Percent
Other	7	100.00%
VisNetic (4 servers)
Version	Number of Servers	Percent
9.3.2.0	2	50.00%
8.0.3	1	25.00%
6.2.2.0	1	25.00%
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%
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%
Neon Mail Server (1 servers)
Version	Number of Servers	Percent
3.1.2	1	100.00%
Other	0	0.00%