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	765,451	100.0%
Number of Servers that didn't respond	107,776	14.08%
Server didn't open socket	105,730	13.81%
Server didn't provide banner	2,046	0.27%
Server provided banner	657,675	85.92%
Server banner identifies software in use	439,780	57.45%

As indicated by the above table, of the 765,451 servers queried, only 439,780 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	268,027	60.95%
Postfix	142,000	32.29%
Sendmail	15,494	3.52%
MailEnable	8,761	1.99%
MDaemon	1,960	0.45%
Microsoft	988	0.22%
CommuniGate Pro	502	0.11%
Qmail Toaster	390	0.09%
IMail	382	0.09%
XMail	299	0.07%
OpenSMTPD	232	0.05%
SurgeSMTP	224	0.05%
Lotus Domino	98	0.02%
MagicMail	95	0.02%
WinWebMail	78	0.02%
Merak	60	0.01%
Kerio	52	0.01%
Post.Office	43	0.01%
ArGoSoft	34	0.01%
GroupWise	24	0.01%
Gordano Messaging Suite (GMS)	12	0.00%
Trend Micro	9	0.00%
OpenVMS	5	0.00%
VisNetic	3	0.00%
ModusMail	2	0.00%
Neon Mail Server	1	0.00%
Interscan	1	0.00%
WebSTAR	1	0.00%
Mirapoint	1	0.00%
WebSTAR V	1	0.00%
InterScan VirusWall	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (268,027 servers)
Version	Number of Servers	Percent
4.94.2	206,456	77.03%
4.93	19,001	7.09%
4.95	9,203	3.43%
4.94	5,331	1.99%
4.92	4,795	1.79%
4.91	3,543	1.32%
4.92.3	2,784	1.04%
4.89	2,690	1.00%
Other	14,224	5.31%
Postfix (142,000 servers)
Version	Number of Servers	Percent
Other	142,000	100.00%
Sendmail (15,494 servers)
Version	Number of Servers	Percent
8.15.2	8,872	57.26%
8.14.4	1,788	11.54%
8.14.7	1,538	9.93%
8.13.8	831	5.36%
8.14.5	759	4.90%
8.16.1	383	2.47%
8.14.9	269	1.74%
8.13.1	244	1.57%
8.14.3	159	1.03%
Other	651	4.20%
MailEnable (8,761 servers)
Version	Number of Servers	Percent
10.34--	3,433	39.19%
10.27--	630	7.19%
10.25--	468	5.34%
9.00--	232	2.65%
10.37--	223	2.55%
10.37--10.37	153	1.75%
10.31--	136	1.55%
10.31-10.31-	134	1.53%
10.37-10.37-	131	1.50%
9.00--9.00	103	1.18%
9.16--	98	1.12%
10.29--	96	1.10%
Other	2,924	33.38%
MDaemon (1,960 servers)
Version	Number of Servers	Percent
21.5.1	186	9.49%
13.5.1	117	5.97%
21.0.3	112	5.71%
21.5.0	90	4.59%
13.0.5	85	4.34%
13.0.4	80	4.08%
11.0.0	74	3.78%
11.0.3	72	3.67%
19.5.5	69	3.52%
21.0.2	61	3.11%
16.5.2	49	2.50%
19.5.4	45	2.30%
21.0.1	41	2.09%
14.5.2	39	1.99%
12.5.6	37	1.89%
20.0.4	27	1.38%
9.6.6	25	1.28%
10.0.0	24	1.22%
15.0.3	21	1.07%
12.5.4	20	1.02%
10.1.2	20	1.02%
Other	666	33.98%
Microsoft (988 servers)
Version	Number of Servers	Percent
6.0.3790.4675	309	31.28%
8.5.9600.16384	152	15.38%
10.0.14393.4169	107	10.83%
10.0.17763.1697	73	7.39%
7.5.7601.17514	72	7.29%
5.0.2195.5329	51	5.16%
6.0.3790.3959	51	5.16%
8.0.9200.16384	28	2.83%
5.0.2195.6713	22	2.23%
10.0.14393.2608	17	1.72%
6.0.3790.1830	13	1.32%
10.0.17763.1	12	1.21%
7.0.6002.18264	11	1.11%
10.0.14393.0	10	1.01%
Other	60	6.07%
CommuniGate Pro (502 servers)
Version	Number of Servers	Percent
6.2.15	62	12.35%
6.2.14	46	9.16%
6.1.20	21	4.18%
6.2.12	18	3.59%
6.0.11	14	2.79%
5.4.11	13	2.59%
6.2.16	13	2.59%
6.1.18	13	2.59%
6.1.16	12	2.39%
6.3.6	10	1.99%
5.2.20	9	1.79%
5.1.16	9	1.79%
7.1.1	8	1.59%
6.3.5	8	1.59%
6.0.9	8	1.59%
6.3.9	8	1.59%
6.3.7	7	1.39%
6.2.10	7	1.39%
6.3.4	7	1.39%
5.2.13	6	1.20%
5.1.7	6	1.20%
Other	197	39.24%
Qmail Toaster (390 servers)
Version	Number of Servers	Percent
1.3	305	78.21%
1.03	76	19.49%
1.03.5	5	1.28%
Other	4	1.03%
IMail (382 servers)
Version	Number of Servers	Percent
12.5.8.41	69	18.06%
12.5.6.101	45	11.78%
12.5.7.59	35	9.16%
9.23	22	5.76%
12.4.1.15	22	5.76%
8.22	21	5.50%
8.05	18	4.71%
12.5.6.105	16	4.19%
12.5.3.93	15	3.93%
12.3.0.100	13	3.40%
12.5.5.115	12	3.14%
8.15	11	2.88%
12.5.5.117	8	2.09%
12.5.4.146	7	1.83%
10.02	7	1.83%
12.5.8.54	6	1.57%
11.5	6	1.57%
9.20	4	1.05%
7.07	4	1.05%
Other	41	10.73%
XMail (299 servers)
Version	Number of Servers	Percent
1.27	152	50.84%
1.22	101	33.78%
1.26	15	5.02%
1.25	11	3.68%
1.24	5	1.67%
1.15	5	1.67%
Other	10	3.34%
OpenSMTPD (232 servers)
Version	Number of Servers	Percent
Other	232	100.00%
SurgeSMTP (224 servers)
Version	Number of Servers	Percent
7.3o4-4	29	12.95%
7.5c-1	23	10.27%
7.6h-2	22	9.82%
7.5a-1	15	6.70%
7.4o-1	14	6.25%
7.3e2-2	14	6.25%
7.6d-1	13	5.80%
7.1e-1	11	4.91%
6.7c-1	7	3.12%
7.4e-1	7	3.12%
7.3i2-2	6	2.68%
6.5a2-2	5	2.23%
7.2a-1	4	1.79%
3.9e-1	4	1.79%
6.9c-1	3	1.34%
7.6h-1	3	1.34%
Other	44	19.64%
Lotus Domino (98 servers)
Version	Number of Servers	Percent
8.5.3	18	18.37%
8.5.3FP6	14	14.29%
7.0	6	6.12%
8.5.2FP2	6	6.12%
7.0.2	5	5.10%
8.5.1	5	5.10%
7.0.3	4	4.08%
8.5.2FP1	2	2.04%
8.5.3FP1	2	2.04%
8.5	2	2.04%
8.5.3FP4	2	2.04%
8.5.1FP4	2	2.04%
8.5.2	2	2.04%
5.0.8	2	2.04%
8.5.2FP3	2	2.04%
7.0.3FP1	2	2.04%
8.0.1	2	2.04%
7.5.1	2	2.04%
6.5.3	2	2.04%
7.0.4FP2	2	2.04%
6.5	1	1.02%
8.5.3FP6HF1215	1	1.02%
6.5.4	1	1.02%
8.5.3FP3	1	1.02%
6.5.6FP3	1	1.02%
8.5.1FP5	1	1.02%
5.0.13a	1	1.02%
8.5.2FP4	1	1.02%
7.0.4FP1	1	1.02%
5.0.11	1	1.02%
8.0	1	1.02%
8.5.3FP2	1	1.02%
6.5.2	1	1.02%
7.0.4	1	1.02%
Other	0	0.00%
MagicMail (95 servers)
Version	Number of Servers	Percent
Other	95	100.00%
WinWebMail (78 servers)
Version	Number of Servers	Percent
4.2.0.1	14	17.95%
3.9.0.7	13	16.67%
4.4.0.1	10	12.82%
4.3.0.1	7	8.97%
3.8.6.1	5	6.41%
3.8.1.3	4	5.13%
3.7.3.1	3	3.85%
3.8.5.1	3	3.85%
4.0.0.1	3	3.85%
1.0	2	2.56%
4.1.0.1	2	2.56%
3.8.0.1	2	2.56%
3.7.6.1	2	2.56%
3.8.1.5	2	2.56%
3.7.5.1	2	2.56%
3.7.6.2	1	1.28%
3.9.0.1	1	1.28%
3.8.1.1	1	1.28%
3.9.2.2	1	1.28%
Other	0	0.00%
Merak (60 servers)
Version	Number of Servers	Percent
8.0.3	18	30.00%
8.9.1	14	23.33%
7.6.1	7	11.67%
8.5.0	3	5.00%
7.4.5	3	5.00%
9.0.3	3	5.00%
8.3.8	2	3.33%
8.9.2	1	1.67%
6.1.0	1	1.67%
4.4.2	1	1.67%
5.8.2	1	1.67%
8.9.7	1	1.67%
7.6.4	1	1.67%
7.6.0	1	1.67%
6.0.8	1	1.67%
8.9.0	1	1.67%
6.0.3	1	1.67%
Other	0	0.00%
Kerio (52 servers)
Version	Number of Servers	Percent
6.7.3	9	17.31%
6.6.2	9	17.31%
6.6.1	6	11.54%
6.5.0	6	11.54%
6.7.0	5	9.62%
6.5.2	5	9.62%
6.7.1	2	3.85%
6.3.0	2	3.85%
6.0.10	1	1.92%
5.7.9	1	1.92%
6.3.1	1	1.92%
6.0.8	1	1.92%
6.6.0	1	1.92%
6.4.1	1	1.92%
6.5.1	1	1.92%
6.7.2	1	1.92%
Other	0	0.00%
Post.Office (43 servers)
Version	Number of Servers	Percent
4.4	11	25.58%
4.2.2	9	20.93%
4.3	7	16.28%
3.5.3	3	6.98%
4.1.2.4	3	6.98%
3.9.2	2	4.65%
4.2.1.1	2	4.65%
4.2	1	2.33%
4.1.1	1	2.33%
3.5.3J	1	2.33%
4.1.0.3	1	2.33%
4.1	1	2.33%
3.1.2	1	2.33%
Other	0	0.00%
ArGoSoft (34 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.5)	5	14.71%
1.8 (1.8.9.3)	5	14.71%
1.8 (1.8.9.6)	5	14.71%
1.8 (1.8.8.8)	3	8.82%
1.8 (1.8.9.1)	3	8.82%
1.8 (1.8.7.3)	2	5.88%
1.8 (1.8.8.7)	2	5.88%
1.8 (1.8.9.2)	2	5.88%
1.8 (1.8.6.1)	1	2.94%
1.8 (1.8.8.9)	1	2.94%
1.8 (1.8.5.8)	1	2.94%
1.8 (1.8.8.4)	1	2.94%
1.8 (1.8.9.4)	1	2.94%
1.8 (1.8.2.1)	1	2.94%
1.8 (1.8.2.5)	1	2.94%
Other	0	0.00%
GroupWise (24 servers)
Version	Number of Servers	Percent
18.3.1	7	29.17%
18.2.0	3	12.50%
18.1.1	2	8.33%
14.2.1	2	8.33%
18.2.1	2	8.33%
18.0.0	1	4.17%
6.5.0	1	4.17%
8.0.3	1	4.17%
7.0.1	1	4.17%
14.2.0	1	4.17%
14.2.2	1	4.17%
14.0.0	1	4.17%
18.0.2	1	4.17%
Other	0	0.00%
Gordano Messaging Suite (GMS) (12 servers)
Version	Number of Servers	Percent
Other	12	100.00%
Trend Micro (9 servers)
Version	Number of Servers	Percent
5.18	4	44.44%
5.7	3	33.33%
7.5ready	1	11.11%
7.1	1	11.11%
Other	0	0.00%
OpenVMS (5 servers)
Version	Number of Servers	Percent
8.4	3	60.00%
7.3	1	20.00%
8.2	1	20.00%
Other	0	0.00%
VisNetic (3 servers)
Version	Number of Servers	Percent
8.0.3	1	33.33%
5.0.1	1	33.33%
9.3.2.0	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%
Neon Mail Server (1 servers)
Version	Number of Servers	Percent
3.1.2	1	100.00%
Other	0	0.00%
Interscan (1 servers)
Version	Number of Servers	Percent
3.8-Build_3013	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%
WebSTAR V (1 servers)
Version	Number of Servers	Percent
5.3.2	1	100.00%
Other	0	0.00%
InterScan VirusWall (1 servers)
Version	Number of Servers	Percent
Other	1	100.00%