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	1,077,377	100.0%
Number of Servers that didn't respond	181,739	16.87%
Server didn't open socket	179,003	16.61%
Server didn't provide banner	2,736	0.25%
Server provided banner	895,638	83.13%
Server banner identifies software in use	580,300	53.86%

As indicated by the above table, of the 1,077,377 servers queried, only 580,300 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	340,667	58.71%
Postfix	200,459	34.54%
Sendmail	19,886	3.43%
MailEnable	11,263	1.94%
MDaemon	2,884	0.50%
Microsoft	1,549	0.27%
CommuniGate Pro	706	0.12%
IMail	549	0.09%
Qmail Toaster	465	0.08%
XMail	400	0.07%
OpenSMTPD	373	0.06%
SurgeSMTP	317	0.05%
Lotus Domino	160	0.03%
WinWebMail	135	0.02%
MagicMail	130	0.02%
Merak	77	0.01%
Kerio	76	0.01%
Post.Office	60	0.01%
ArGoSoft	46	0.01%
GroupWise	42	0.01%
Gordano Messaging Suite (GMS)	19	0.00%
OpenVMS	12	0.00%
Trend Micro	8	0.00%
VisNetic	4	0.00%
InterScan VirusWall	4	0.00%
ModusMail	2	0.00%
Mercury	2	0.00%
Interscan	1	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 (340,667 servers)
Version	Number of Servers	Percent
4.94.2	142,916	41.95%
4.95	136,872	40.18%
4.93	23,030	6.76%
4.92	5,882	1.73%
4.94	5,122	1.50%
4.91	4,107	1.21%
Other	22,738	6.67%
Postfix (200,459 servers)
Version	Number of Servers	Percent
Other	200,459	100.00%
Sendmail (19,886 servers)
Version	Number of Servers	Percent
8.15.2	10,376	52.18%
8.14.7	2,461	12.38%
8.14.4	2,448	12.31%
8.13.8	1,103	5.55%
8.14.5	982	4.94%
8.16.1	598	3.01%
8.13.1	347	1.74%
8.14.9	317	1.59%
8.17.1	267	1.34%
8.14.3	214	1.08%
Other	773	3.89%
MailEnable (11,263 servers)
Version	Number of Servers	Percent
10.34--	4,578	40.65%
10.27--	679	6.03%
10.25--	542	4.81%
10.37--	305	2.71%
9.00--	295	2.62%
10.31-10.31-	172	1.53%
10.31--	161	1.43%
10.37--10.37	157	1.39%
10.37-10.37-	125	1.11%
10.29--	121	1.07%
9.16--	116	1.03%
9.00--9.00	114	1.01%
Other	3,898	34.61%
MDaemon (2,884 servers)
Version	Number of Servers	Percent
21.5.2	456	15.81%
13.5.1	186	6.45%
21.5.1	123	4.26%
13.0.5	118	4.09%
19.5.4	101	3.50%
13.0.4	94	3.26%
11.0.0	89	3.09%
11.0.3	88	3.05%
21.0.3	81	2.81%
19.5.5	76	2.64%
16.5.2	75	2.60%
12.5.6	61	2.12%
21.0.1	55	1.91%
21.0.2	52	1.80%
14.5.2	50	1.73%
21.5.0	48	1.66%
10.0.0	38	1.32%
10.1.2	35	1.21%
12.5.4	34	1.18%
20.0.4	33	1.14%
Other	991	34.36%
Microsoft (1,549 servers)
Version	Number of Servers	Percent
6.0.3790.4675	485	31.31%
8.5.9600.16384	246	15.88%
10.0.14393.4169	157	10.14%
7.5.7601.17514	134	8.65%
10.0.17763.1697	130	8.39%
6.0.3790.3959	94	6.07%
5.0.2195.5329	58	3.74%
8.0.9200.16384	43	2.78%
5.0.2195.6713	32	2.07%
10.0.17763.1	23	1.48%
10.0.14393.2608	17	1.10%
7.0.6002.18264	17	1.10%
6.0.3790.1830	17	1.10%
Other	96	6.20%
CommuniGate Pro (706 servers)
Version	Number of Servers	Percent
6.2.15	84	11.90%
6.2.14	70	9.92%
6.1.20	28	3.97%
6.3.10	26	3.68%
6.0.11	21	2.97%
6.2.12	18	2.55%
5.2.20	18	2.55%
6.3.9	17	2.41%
5.4.11	16	2.27%
7.1.1	16	2.27%
6.1.16	15	2.12%
5.1.16	13	1.84%
6.1.18	12	1.70%
6.3.6	11	1.56%
6.0.9	11	1.56%
6.3.5	11	1.56%
6.2.10	9	1.27%
6.2.7	8	1.13%
6.3.4	8	1.13%
Other	294	41.64%
IMail (549 servers)
Version	Number of Servers	Percent
12.5.8.41	72	13.11%
12.5.6.101	54	9.84%
12.5.7.59	48	8.74%
12.5.8.58	45	8.20%
9.23	35	6.38%
12.5.5.115	24	4.37%
12.5.8.54	22	4.01%
12.5.3.93	22	4.01%
8.22	22	4.01%
8.05	22	4.01%
12.4.1.15	19	3.46%
12.3.0.100	17	3.10%
12.5.6.105	16	2.91%
8.15	15	2.73%
12.5.4.146	14	2.55%
10.02	12	2.19%
12.5.5.117	9	1.64%
12.5.8.59	9	1.64%
7.07	7	1.28%
Other	65	11.84%
Qmail Toaster (465 servers)
Version	Number of Servers	Percent
1.3	336	72.26%
1.03	119	25.59%
1.03.5	6	1.29%
Other	4	0.86%
XMail (400 servers)
Version	Number of Servers	Percent
1.27	228	57.00%
1.22	119	29.75%
1.26	16	4.00%
1.25	15	3.75%
1.24	8	2.00%
1.15	5	1.25%
Other	9	2.25%
OpenSMTPD (373 servers)
Version	Number of Servers	Percent
Other	373	100.00%
SurgeSMTP (317 servers)
Version	Number of Servers	Percent
7.3o4-4	37	11.67%
7.6j-1	35	11.04%
7.5c-1	30	9.46%
7.5a-1	20	6.31%
7.3e2-2	19	5.99%
7.6h-2	17	5.36%
7.4o-1	13	4.10%
7.1e-1	12	3.79%
7.6d-1	12	3.79%
7.4e-1	10	3.15%
7.6m-1	8	2.52%
6.7c-1	8	2.52%
6.5a2-2	8	2.52%
7.3i2-2	7	2.21%
7.2i-1	5	1.58%
6.9c-1	4	1.26%
3.9e-1	4	1.26%
Other	68	21.45%
Lotus Domino (160 servers)
Version	Number of Servers	Percent
8.5.3FP6	35	21.88%
8.5.3	26	16.25%
8.5.2	7	4.38%
8.5.1	7	4.38%
7.0	6	3.75%
8.5.2FP2	6	3.75%
8.5	5	3.12%
8.5.1FP5	5	3.12%
7.0.3	5	3.12%
7.0.2	4	2.50%
8.5.2FP1	3	1.88%
8.5.3FP1	3	1.88%
8.5.3FP4	3	1.88%
8.5.3FP3	3	1.88%
8.5.2FP3	3	1.88%
7.0.3FP1	3	1.88%
6.5	2	1.25%
8.5.3FP5	2	1.25%
8.5.1FP4	2	1.25%
6.5.1	2	1.25%
6.5.4	2	1.25%
5.0.8	2	1.25%
7.5.1	2	1.25%
6.5.3	2	1.25%
7.0.4FP2	2	1.25%
Other	18	11.25%
WinWebMail (135 servers)
Version	Number of Servers	Percent
4.2.0.1	28	20.74%
3.9.0.7	18	13.33%
4.4.0.1	18	13.33%
4.3.0.1	10	7.41%
3.8.1.3	10	7.41%
3.7.3.1	6	4.44%
3.8.6.1	6	4.44%
4.1.0.1	5	3.70%
3.9.0.1	4	2.96%
1.0	3	2.22%
4.0.0.1	3	2.22%
3.7.6.1	3	2.22%
3.8.3.1	2	1.48%
3.7.7.3	2	1.48%
3.8.5.1	2	1.48%
3.8.0.1	2	1.48%
3.8.1.1	2	1.48%
3.7.5.1	2	1.48%
3.8.1.5	2	1.48%
Other	7	5.19%
MagicMail (130 servers)
Version	Number of Servers	Percent
Other	130	100.00%
Merak (77 servers)
Version	Number of Servers	Percent
8.9.1	21	27.27%
8.0.3	19	24.68%
7.6.1	8	10.39%
7.4.5	4	5.19%
9.0.3	4	5.19%
8.3.8	3	3.90%
8.5.0	2	2.60%
8.0.1	1	1.30%
7.4.2	1	1.30%
8.9.2	1	1.30%
8.3.6	1	1.30%
6.1.0	1	1.30%
4.4.2	1	1.30%
7.6.4	1	1.30%
8.3.0	1	1.30%
4.2.1	1	1.30%
8.9.7	1	1.30%
7.6.0	1	1.30%
6.0.8	1	1.30%
6.0.7	1	1.30%
8.9.0	1	1.30%
6.0.3	1	1.30%
5.8.2	1	1.30%
Other	0	0.00%
Kerio (76 servers)
Version	Number of Servers	Percent
6.7.3	15	19.74%
6.7.0	12	15.79%
6.6.1	8	10.53%
6.6.2	7	9.21%
6.7.1	6	7.89%
6.5.2	6	7.89%
6.5.0	4	5.26%
6.3.1	3	3.95%
6.4.1	2	2.63%
6.3.0	2	2.63%
5.7.9	2	2.63%
5.7.6	2	2.63%
6.5.1	2	2.63%
6.7.2	2	2.63%
6.0.10	1	1.32%
6.0.8	1	1.32%
6.1.4	1	1.32%
Other	0	0.00%
Post.Office (60 servers)
Version	Number of Servers	Percent
4.4	17	28.33%
4.2.2	11	18.33%
4.3	10	16.67%
3.5.3	6	10.00%
4.1.2.4	4	6.67%
3.5.1	3	5.00%
3.9.2	2	3.33%
4.2	1	1.67%
4.1.1	1	1.67%
3.5.3J	1	1.67%
4.2.1.3	1	1.67%
4.1	1	1.67%
3.1.2	1	1.67%
4.2.1.1	1	1.67%
Other	0	0.00%
ArGoSoft (46 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	14	30.43%
1.8 (1.8.9.5)	5	10.87%
1.8 (1.8.9.1)	4	8.70%
1.8 (1.8.9.3)	3	6.52%
1.8 (1.8.8.8)	2	4.35%
1.8 (1.8.7.3)	2	4.35%
1.8 (1.8.8.7)	2	4.35%
1.8 (1.8.7.6)	2	4.35%
1.8 (1.8.9.2)	2	4.35%
1.8 (1.8.2.1)	2	4.35%
1.8 (1.8.6.1)	1	2.17%
1.8 (1.8.5.8)	1	2.17%
1.8 (1.8.8.4)	1	2.17%
1.8 (1.8.9.4)	1	2.17%
1.8 (1.8.3.5)	1	2.17%
1.8 (1.8.1.7)	1	2.17%
1.8 (1.8.8.9)	1	2.17%
1.8 (1.8.2.5)	1	2.17%
Other	0	0.00%
GroupWise (42 servers)
Version	Number of Servers	Percent
18.3.1	10	23.81%
18.2.1	5	11.90%
18.1.1	4	9.52%
18.4.0	4	9.52%
14.2.2	3	7.14%
14.2.1	2	4.76%
18.1.0	2	4.76%
18.2.0	2	4.76%
6.5.7	1	2.38%
18.0.0	1	2.38%
6.5.0	1	2.38%
18.3.0	1	2.38%
8.0.3	1	2.38%
14.2.0	1	2.38%
14.0.0	1	2.38%
6.5.2	1	2.38%
14.2.3	1	2.38%
18.0.2	1	2.38%
Other	0	0.00%
Gordano Messaging Suite (GMS) (19 servers)
Version	Number of Servers	Percent
Other	19	100.00%
OpenVMS (12 servers)
Version	Number of Servers	Percent
8.4	7	58.33%
7.3	3	25.00%
8.3	1	8.33%
8.2	1	8.33%
Other	0	0.00%
Trend Micro (8 servers)
Version	Number of Servers	Percent
5.18	4	50.00%
5.7	3	37.50%
5.5	1	12.50%
Other	0	0.00%
VisNetic (4 servers)
Version	Number of Servers	Percent
9.3.2.0	2	50.00%
8.0.3	1	25.00%
5.0.1	1	25.00%
Other	0	0.00%
InterScan VirusWall (4 servers)
Version	Number of Servers	Percent
Other	4	100.00%
ModusMail (2 servers)
Version	Number of Servers	Percent
4.1.361.21	2	100.00%
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%
Interscan (1 servers)
Version	Number of Servers	Percent
3.8-Build_3013	1	100.00%
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%