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	1,077,495	100.0%
Number of Servers that didn't respond	226,074	20.98%
Server didn't open socket	223,582	20.75%
Server didn't provide banner	2,492	0.23%
Server provided banner	851,421	79.02%
Server banner identifies software in use	541,276	50.23%

As indicated by the above table, of the 1,077,495 servers queried, only 541,276 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	303,243	56.02%
Postfix	203,026	37.51%
Sendmail	18,632	3.44%
MailEnable	9,946	1.84%
MDaemon	2,199	0.41%
Microsoft	1,105	0.20%
CommuniGate Pro	702	0.13%
OpenSMTPD	522	0.10%
XMail	405	0.07%
IMail	351	0.06%
SurgeSMTP	292	0.05%
Qmail Toaster	186	0.03%
MagicMail	147	0.03%
WinWebMail	128	0.02%
Lotus Domino	115	0.02%
Kerio	63	0.01%
Post.Office	58	0.01%
Merak	53	0.01%
ArGoSoft	36	0.01%
GroupWise	30	0.01%
Gordano Messaging Suite (GMS)	14	0.00%
OpenVMS	6	0.00%
InterScan VirusWall	5	0.00%
VisNetic	3	0.00%
Trend Micro	3	0.00%
ModusMail	2	0.00%
MessageWall	2	0.00%
Mercury	1	0.00%
Mirapoint	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (303,243 servers)
Version	Number of Servers	Percent
4.96.2	164,970	54.40%
4.97.1	73,393	24.20%
4.98	11,353	3.74%
4.96	10,784	3.56%
4.95	7,692	2.54%
4.93	7,500	2.47%
4.94.2	5,998	1.98%
4.96.1	3,118	1.03%
4.92	3,116	1.03%
Other	15,319	5.05%
Postfix (203,026 servers)
Version	Number of Servers	Percent
Other	203,026	100.00%
Sendmail (18,632 servers)
Version	Number of Servers	Percent
8.16.1	7,323	39.30%
8.15.2	4,372	23.47%
8.14.7	1,909	10.25%
8.14.4	1,454	7.80%
8.13.8	742	3.98%
8.14.5	618	3.32%
8.18.1	549	2.95%
8.14.9	253	1.36%
8.17.1	249	1.34%
Other	1,163	6.24%
MailEnable (9,946 servers)
Version	Number of Servers	Percent
10.48--	3,654	36.74%
10.46--	1,262	12.69%
10.34--	348	3.50%
10.43--	259	2.60%
10.47--	235	2.36%
10.25--	231	2.32%
10.27--	205	2.06%
10.48--10.48	179	1.80%
10.43-10.43-	153	1.54%
10.48-10.48-	134	1.35%
10.42--	128	1.29%
10.47--10.47	127	1.28%
9.00--	126	1.27%
10.47-10.47-	122	1.23%
Other	2,783	27.98%
MDaemon (2,199 servers)
Version	Number of Servers	Percent
24.0.2	241	10.96%
24.0.1	108	4.91%
13.5.1	95	4.32%
19.5.4	81	3.68%
13.0.4	78	3.55%
13.0.5	73	3.32%
11.0.0	71	3.23%
11.0.3	68	3.09%
24.5.0	68	3.09%
23.5.3	62	2.82%
23.0.2	58	2.64%
16.5.2	53	2.41%
21.5.4	51	2.32%
14.5.2	44	2.00%
12.5.6	37	1.68%
23.0.1	37	1.68%
23.5.1	35	1.59%
21.5.2	34	1.55%
23.5.2	33	1.50%
23.5.0	33	1.50%
19.5.5	30	1.36%
24.0.0	28	1.27%
10.1.2	26	1.18%
22.0.3	23	1.05%
Other	732	33.29%
Microsoft (1,105 servers)
Version	Number of Servers	Percent
6.0.3790.4675	265	23.98%
10.0.17763.1697	221	20.00%
10.0.14393.4169	135	12.22%
8.5.9600.16384	129	11.67%
7.5.7601.17514	72	6.52%
6.0.3790.3959	65	5.88%
5.0.2195.5329	50	4.52%
10.0.20348.1	33	2.99%
5.0.2195.6713	21	1.90%
8.0.9200.16384	20	1.81%
10.0.17763.1	14	1.27%
6.0.3790.1830	13	1.18%
Other	67	6.06%
CommuniGate Pro (702 servers)
Version	Number of Servers	Percent
6.2.15	55	7.83%
6.2.14	46	6.55%
6.4.1	36	5.13%
6.3.20	25	3.56%
6.1.20	25	3.56%
6.3.17	25	3.56%
6.4.0	21	2.99%
6.3.18	21	2.99%
6.0.11	14	1.99%
6.1.16	13	1.85%
5.4.11	12	1.71%
6.0.9	12	1.71%
5.2.20	11	1.57%
6.1.18	11	1.57%
6.3.19	10	1.42%
6.3.14	10	1.42%
6.3.37	10	1.42%
6.2.12	9	1.28%
6.3.6	9	1.28%
5.1.16	9	1.28%
Other	318	45.30%
OpenSMTPD (522 servers)
Version	Number of Servers	Percent
Other	522	100.00%
XMail (405 servers)
Version	Number of Servers	Percent
1.27	263	64.94%
1.22	90	22.22%
1.26	18	4.44%
1.25	12	2.96%
1.24	10	2.47%
Other	12	2.96%
IMail (351 servers)
Version	Number of Servers	Percent
12.6.1.4	74	21.08%
9.23	26	7.41%
12.5.8.41	24	6.84%
12.5.8.59	22	6.27%
12.5.6.101	19	5.41%
12.5.7.59	16	4.56%
12.5.6.105	15	4.27%
12.5.3.93	14	3.99%
8.22	14	3.99%
8.05	13	3.70%
12.4.1.15	12	3.42%
12.5.8.58	11	3.13%
12.5.4.146	8	2.28%
12.5.5.115	6	1.71%
7.07	6	1.71%
12.3.0.100	6	1.71%
12.5.8.54	5	1.42%
8.00	5	1.42%
12.6.0.17	5	1.42%
11.5	5	1.42%
12.6.0.20	4	1.14%
10.02	4	1.14%
12.5.5.117	4	1.14%
Other	33	9.40%
SurgeSMTP (292 servers)
Version	Number of Servers	Percent
7.8a-1	45	15.41%
7.8c2-2	26	8.90%
7.3o4-4	22	7.53%
7.7c-1	20	6.85%
7.8g-1	18	6.16%
7.6j-1	17	5.82%
7.5c-1	14	4.79%
7.3e2-2	11	3.77%
7.7i-1	10	3.42%
7.1e-1	10	3.42%
7.4e-1	8	2.74%
6.9c-1	8	2.74%
7.5a-1	7	2.40%
6.5a2-2	7	2.40%
7.4o-1	6	2.05%
7.6u-1	5	1.71%
7.2i-1	5	1.71%
7.4m-1	4	1.37%
7.6h-2	4	1.37%
7.7h-3	3	1.03%
7.8h-4	3	1.03%
7.6s-1	3	1.03%
7.8b-2	3	1.03%
6.5a-1	3	1.03%
Other	30	10.27%
Qmail Toaster (186 servers)
Version	Number of Servers	Percent
1.03	117	62.90%
1.3	63	33.87%
1.03.5	4	2.15%
1.03.6	2	1.08%
Other	0	0.00%
MagicMail (147 servers)
Version	Number of Servers	Percent
Other	147	100.00%
WinWebMail (128 servers)
Version	Number of Servers	Percent
4.5.0.1	20	15.62%
3.8.1.3	15	11.72%
4.4.0.1	15	11.72%
4.2.0.1	15	11.72%
3.9.0.7	12	9.38%
4.0.0.1	7	5.47%
4.1.0.1	6	4.69%
4.3.0.1	6	4.69%
3.9.0.1	4	3.12%
3.9.3.1	3	2.34%
3.7.7.3	3	2.34%
3.7.3.1	3	2.34%
3.8.1.5	2	1.56%
3.8.0.1	2	1.56%
3.9.5.3	2	1.56%
3.8.6.1	2	1.56%
3.7.1.1	2	1.56%
3.8.1.1	2	1.56%
Other	7	5.47%
Lotus Domino (115 servers)
Version	Number of Servers	Percent
8.5.3FP6	23	20.00%
8.5.3	22	19.13%
8.5	5	4.35%
6.5	5	4.35%
8.5.1	5	4.35%
7.0	4	3.48%
8.5.2FP1	4	3.48%
8.5.2	4	3.48%
8.5.3FP3	4	3.48%
7.0.2	4	3.48%
6.5.1	3	2.61%
6.5.3	3	2.61%
8.0	3	2.61%
6.5.2	2	1.74%
7.0.3	2	1.74%
7.0.4FP2	2	1.74%
7.5.1	2	1.74%
7.0.3FP1	2	1.74%
Other	16	13.91%
Kerio (63 servers)
Version	Number of Servers	Percent
6.7.3	12	19.05%
6.7.0	9	14.29%
6.6.2	8	12.70%
6.6.1	8	12.70%
6.7.1	5	7.94%
6.7.2	4	6.35%
6.5.2	4	6.35%
5.7.9	2	3.17%
6.5.1	2	3.17%
6.4.1	1	1.59%
6.0.10	1	1.59%
5.7.6	1	1.59%
6.0.8	1	1.59%
6.3.1	1	1.59%
6.6.0	1	1.59%
6.4.0	1	1.59%
6.3.0	1	1.59%
6.5.0	1	1.59%
Other	0	0.00%
Post.Office (58 servers)
Version	Number of Servers	Percent
4.4	24	41.38%
4.2.2	10	17.24%
4.3	5	8.62%
3.5.3	5	8.62%
4.1.2.4	4	6.90%
3.5.1	3	5.17%
4.2.1.3	2	3.45%
4.2.1.1	2	3.45%
4.2	1	1.72%
3.9.2	1	1.72%
3.1.2	1	1.72%
Other	0	0.00%
Merak (53 servers)
Version	Number of Servers	Percent
8.9.1	14	26.42%
8.0.3	13	24.53%
7.6.1	8	15.09%
8.3.8	3	5.66%
7.4.5	2	3.77%
7.6.4	2	3.77%
6.0.8	2	3.77%
8.0.1	1	1.89%
8.9.2	1	1.89%
6.1.0	1	1.89%
9.0.3	1	1.89%
8.5.0	1	1.89%
7.5.2	1	1.89%
7.6.0	1	1.89%
7.4.4	1	1.89%
5.8.2	1	1.89%
Other	0	0.00%
ArGoSoft (36 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	11	30.56%
1.8 (1.8.9.3)	5	13.89%
1.8 (1.8.9.5)	5	13.89%
1.8 (1.8.9.1)	3	8.33%
1.8 (1.8.8.8)	2	5.56%
1.8 (1.8.7.3)	2	5.56%
1.8 (1.8.8.7)	2	5.56%
1.8 (1.8.9.2)	2	5.56%
1.8 (1.8.6.1)	1	2.78%
1.8 (1.8.3.5)	1	2.78%
1.8 (1.8.5.9)	1	2.78%
1.8 (1.8.8.9)	1	2.78%
Other	0	0.00%
GroupWise (30 servers)
Version	Number of Servers	Percent
24.2.0	5	16.67%
24.3.0	5	16.67%
18.3.1	4	13.33%
18.2.1	3	10.00%
18.1.1	2	6.67%
18.5.0	2	6.67%
18.2.0	2	6.67%
14.2.1	1	3.33%
24.1.0	1	3.33%
14.2.3	1	3.33%
6.5.0	1	3.33%
18.4.1	1	3.33%
18.0.2	1	3.33%
14.0.0	1	3.33%
Other	0	0.00%
Gordano Messaging Suite (GMS) (14 servers)
Version	Number of Servers	Percent
Other	14	100.00%
OpenVMS (6 servers)
Version	Number of Servers	Percent
7.3	3	50.00%
8.4	2	33.33%
8.2	1	16.67%
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%
Mercury (1 servers)
Version	Number of Servers	Percent
4.x	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%