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	1,304,444	100.0%
Number of Servers that didn't respond	229,132	17.57%
Server didn't open socket	224,826	17.24%
Server didn't provide banner	4,306	0.33%
Server provided banner	1,075,312	82.43%
Server banner identifies software in use	674,109	51.68%

As indicated by the above table, of the 1,304,444 servers queried, only 674,109 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	389,062	57.71%
Postfix	234,571	34.80%
Sendmail	24,670	3.66%
MailEnable	13,772	2.04%
MDaemon	4,673	0.69%
Microsoft	2,597	0.39%
CommuniGate Pro	944	0.14%
IMail	789	0.12%
XMail	534	0.08%
Qmail Toaster	510	0.08%
SurgeSMTP	386	0.06%
OpenSMTPD	360	0.05%
WinWebMail	292	0.04%
Lotus Domino	270	0.04%
MagicMail	139	0.02%
Kerio	123	0.02%
Merak	115	0.02%
Post.Office	92	0.01%
ArGoSoft	78	0.01%
GroupWise	52	0.01%
Gordano Messaging Suite (GMS)	28	0.00%
Trend Micro	20	0.00%
OpenVMS	10	0.00%
VisNetic	6	0.00%
WebSTAR V	3	0.00%
InterScan VirusWall	3	0.00%
Mercury	2	0.00%
ModusMail	2	0.00%
Interscan	2	0.00%
MessageWall	1	0.00%
WebSTAR	1	0.00%
Mirapoint	1	0.00%
Neon Mail Server	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (389,062 servers)
Version	Number of Servers	Percent
4.93	284,141	73.03%
4.92	18,428	4.74%
4.91	17,846	4.59%
4.94	15,707	4.04%
4.92.3	9,362	2.41%
4.93.0.4	7,385	1.90%
4.89	6,049	1.55%
4.87	5,485	1.41%
4.84	4,782	1.23%
Other	19,877	5.11%
Postfix (234,571 servers)
Version	Number of Servers	Percent
Other	234,571	100.00%
Sendmail (24,670 servers)
Version	Number of Servers	Percent
8.15.2	11,322	45.89%
8.14.4	4,271	17.31%
8.14.7	2,333	9.46%
8.13.8	2,001	8.11%
8.14.5	1,569	6.36%
8.14.9	724	2.93%
8.13.1	545	2.21%
8.14.3	409	1.66%
Other	1,496	6.06%
MailEnable (13,772 servers)
Version	Number of Servers	Percent
10.27--	3,044	22.10%
10.25--	2,998	21.77%
9.00--	552	4.01%
10.29--	339	2.46%
10.30--	325	2.36%
10.12--	210	1.52%
9.16--	192	1.39%
8.60--	174	1.26%
10.30--10.30	169	1.23%
9.00--9.00	147	1.07%
10.29-10.29-	139	1.01%
Other	5,483	39.81%
MDaemon (4,673 servers)
Version	Number of Servers	Percent
19.5.5	819	17.53%
13.5.1	293	6.27%
13.6.3	279	5.97%
13.0.5	184	3.94%
13.0.4	181	3.87%
11.0.3	164	3.51%
11.0.0	157	3.36%
16.5.2	123	2.63%
12.5.6	99	2.12%
19.5.4	93	1.99%
14.5.2	87	1.86%
12.5.4	84	1.80%
20.0.0	83	1.78%
20.0.1	68	1.46%
10.1.2	59	1.26%
10.0.0	56	1.20%
19.0.3	55	1.18%
19.5.3	55	1.18%
10.1.0	53	1.13%
16.0.4	50	1.07%
15.0.3	49	1.05%
Other	1,582	33.85%
Microsoft (2,597 servers)
Version	Number of Servers	Percent
6.0.3790.4675	1,027	39.55%
8.5.9600.16384	402	15.48%
7.5.7601.17514	280	10.78%
10.0.14393.2608	218	8.39%
6.0.3790.3959	139	5.35%
10.0.17763.1	118	4.54%
5.0.2195.5329	76	2.93%
8.0.9200.16384	64	2.46%
5.0.2195.6713	38	1.46%
6.0.3790.1830	38	1.46%
7.0.6002.18264	35	1.35%
5.0.2195.7381	30	1.16%
Other	132	5.08%
CommuniGate Pro (944 servers)
Version	Number of Servers	Percent
6.2.14	87	9.22%
6.2.15	54	5.72%
6.1.20	32	3.39%
6.0.11	28	2.97%
6.1.16	24	2.54%
5.4.11	24	2.54%
6.2.12	24	2.54%
6.2.15.	22	2.33%
6.2.14.	21	2.22%
5.2.20	21	2.22%
5.3.13	21	2.22%
6.1.18	19	2.01%
5.1.16	18	1.91%
6.2.13	13	1.38%
6.0.9	13	1.38%
5.2.3	11	1.17%
6.2.12.	10	1.06%
6.2.9	10	1.06%
6.1.2	10	1.06%
Other	482	51.06%
IMail (789 servers)
Version	Number of Servers	Percent
12.5.7.59	101	12.80%
12.5.8.41	95	12.04%
12.5.6.101	86	10.90%
12.4.1.15	58	7.35%
9.23	49	6.21%
8.22	43	5.45%
12.5.3.93	36	4.56%
8.05	34	4.31%
12.3.0.100	32	4.06%
8.15	29	3.68%
12.5.5.115	29	3.68%
11.03	20	2.53%
12.5.6.105	18	2.28%
10.02	15	1.90%
12.5.5.117	15	1.90%
12.5.4.146	14	1.77%
12.5.7.58	13	1.65%
11.5	9	1.14%
8.00	8	1.01%
7.07	8	1.01%
Other	77	9.76%
XMail (534 servers)
Version	Number of Servers	Percent
1.27	278	52.06%
1.22	169	31.65%
1.26	27	5.06%
1.25	21	3.93%
1.24	16	3.00%
Other	23	4.31%
Qmail Toaster (510 servers)
Version	Number of Servers	Percent
1.3	382	74.90%
1.03	116	22.75%
1.03.5	7	1.37%
Other	5	0.98%
SurgeSMTP (386 servers)
Version	Number of Servers	Percent
7.3o4-4	62	16.06%
7.4o-1	53	13.73%
7.4e-1	31	8.03%
7.3e2-2	28	7.25%
7.3i2-2	18	4.66%
7.1e-1	18	4.66%
6.5a2-2	16	4.15%
7.4m-1	13	3.37%
7.2i-1	13	3.37%
6.7c-1	12	3.11%
7.4p-18	9	2.33%
7.2a-1	8	2.07%
3.9e-1	8	2.07%
6.5a-1	6	1.55%
7.4g-1	5	1.30%
7.2e-2	5	1.30%
7.4q-1	5	1.30%
6.9c-1	4	1.04%
4.0u4-4	4	1.04%
7.0c2-2	4	1.04%
5.0e4-4	4	1.04%
Other	60	15.54%
OpenSMTPD (360 servers)
Version	Number of Servers	Percent
Other	360	100.00%
WinWebMail (292 servers)
Version	Number of Servers	Percent
4.2.0.1	77	26.37%
3.9.0.7	50	17.12%
3.8.1.3	26	8.90%
3.8.0.1	17	5.82%
3.9.0.1	14	4.79%
3.7.6.1	10	3.42%
4.0.0.1	10	3.42%
4.1.0.1	9	3.08%
3.7.3.1	9	3.08%
3.8.3.1	7	2.40%
3.8.6.1	7	2.40%
3.9.2.1	7	2.40%
3.8.5.1	6	2.05%
3.8.1.1	6	2.05%
3.8.1.5	6	2.05%
1.0	4	1.37%
3.7.7.3	4	1.37%
3.9.5.3	4	1.37%
3.9.3.1	3	1.03%
Other	16	5.48%
Lotus Domino (270 servers)
Version	Number of Servers	Percent
8.5.3FP6	53	19.63%
8.5.3	37	13.70%
8.5.1	15	5.56%
8.5.2	11	4.07%
8.5.2FP2	11	4.07%
7.0.2	11	4.07%
7.0	8	2.96%
8.5	8	2.96%
8.5.3FP1	7	2.59%
8.5.3FP5	6	2.22%
8.5.1FP5	6	2.22%
7.0.3	6	2.22%
6.5.4	5	1.85%
8.5.3FP4	5	1.85%
8.0.1	5	1.85%
8.5.3FP3	5	1.85%
6.5.3	4	1.48%
8.5.2FP3	4	1.48%
7.0.4	4	1.48%
8.5.2FP1	3	1.11%
8.5.2FP4HF759	3	1.11%
6.5.5	3	1.11%
8.5.3FP2	3	1.11%
8.5.2FP4	3	1.11%
5.0.8	3	1.11%
7.0.3FP1	3	1.11%
Other	38	14.07%
MagicMail (139 servers)
Version	Number of Servers	Percent
Other	139	100.00%
Kerio (123 servers)
Version	Number of Servers	Percent
6.7.3	30	24.39%
6.7.0	19	15.45%
6.6.2	13	10.57%
6.6.1	9	7.32%
6.7.2	9	7.32%
6.7.1	7	5.69%
6.5.2	6	4.88%
6.5.0	6	4.88%
6.4.1	4	3.25%
6.3.0	3	2.44%
6.3.1	2	1.63%
5.7.9	2	1.63%
6.4.0	2	1.63%
5.7.6	2	1.63%
6.5.1	2	1.63%
Other	7	5.69%
Merak (115 servers)
Version	Number of Servers	Percent
8.9.1	31	26.96%
8.0.3	28	24.35%
7.6.1	10	8.70%
7.4.5	8	6.96%
8.5.0	6	5.22%
8.3.8	5	4.35%
9.0.3	5	4.35%
7.5.2	4	3.48%
7.6.4	2	1.74%
6.0.8	2	1.74%
Other	14	12.17%
Post.Office (92 servers)
Version	Number of Servers	Percent
4.4	22	23.91%
4.3	22	23.91%
4.2.2	14	15.22%
3.5.3	8	8.70%
4.1.2.4	6	6.52%
4.2.1.1	4	4.35%
3.9.2	2	2.17%
4.0.1	2	2.17%
4.1.2.1	1	1.09%
4.1.1	1	1.09%
3.5.3J	1	1.09%
3.5.1	1	1.09%
3.6.2	1	1.09%
3.9.1.3	1	1.09%
4.1.0.3	1	1.09%
4.2.1.3	1	1.09%
4.1	1	1.09%
3.1.2	1	1.09%
3.1.2J	1	1.09%
4.2	1	1.09%
Other	0	0.00%
ArGoSoft (78 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	25	32.05%
1.8 (1.8.9.3)	15	19.23%
1.8 (1.8.9.5)	12	15.38%
1.8 (1.8.9.1)	5	6.41%
1.8 (1.8.8.8)	3	3.85%
1.8 (1.8.7.3)	3	3.85%
1.8 (1.8.7.6)	2	2.56%
1.8 (1.8.8.9)	2	2.56%
1.8 (1.8.9.2)	2	2.56%
1.8 (1.8.2.1)	2	2.56%
1.8 (1.8.6.1)	1	1.28%
1.8 (1.8.8.7)	1	1.28%
1.8 (1.8.1.7)	1	1.28%
1.8 (1.8.5.8)	1	1.28%
1.8 (1.8.8.4)	1	1.28%
1.8 (1.8.1.1)	1	1.28%
1.8 (1.8.2.5)	1	1.28%
Other	0	0.00%
GroupWise (52 servers)
Version	Number of Servers	Percent
18.1.1	9	17.31%
18.2.0	7	13.46%
18.2.1	6	11.54%
14.2.1	5	9.62%
18.1.0	4	7.69%
14.2.2	4	7.69%
14.2.3	3	5.77%
18.0.2	3	5.77%
14.0.1	2	3.85%
14.2.0	2	3.85%
6.5.7	1	1.92%
6.5.0	1	1.92%
7.0.1	1	1.92%
14.0.0	1	1.92%
6.5.4	1	1.92%
18.0.0	1	1.92%
6.0.2	1	1.92%
Other	0	0.00%
Gordano Messaging Suite (GMS) (28 servers)
Version	Number of Servers	Percent
Other	28	100.00%
Trend Micro (20 servers)
Version	Number of Servers	Percent
5.7	7	35.00%
5.18	4	20.00%
5.5	3	15.00%
7.5	3	15.00%
7.5ready	1	5.00%
7.0	1	5.00%
7.1	1	5.00%
Other	0	0.00%
OpenVMS (10 servers)
Version	Number of Servers	Percent
8.4	6	60.00%
7.3	2	20.00%
8.3	2	20.00%
Other	0	0.00%
VisNetic (6 servers)
Version	Number of Servers	Percent
9.3.2.0	4	66.67%
8.0.3	1	16.67%
6.2.2.0	1	16.67%
Other	0	0.00%
WebSTAR V (3 servers)
Version	Number of Servers	Percent
5.4.1	2	66.67%
5.3.2	1	33.33%
Other	0	0.00%
InterScan VirusWall (3 servers)
Version	Number of Servers	Percent
Other	3	100.00%
Mercury (2 servers)
Version	Number of Servers	Percent
3.32	1	50.00%
1.48	1	50.00%
Other	0	0.00%
ModusMail (2 servers)
Version	Number of Servers	Percent
4.1.361.21	2	100.00%
Other	0	0.00%
Interscan (2 servers)
Version	Number of Servers	Percent
3.8-Build_3013	1	50.00%
3.81-Build_1022	1	50.00%
Other	0	0.00%
MessageWall (1 servers)
Version	Number of Servers	Percent
1.0.8	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%
Neon Mail Server (1 servers)
Version	Number of Servers	Percent
3.1.2	1	100.00%
Other	0	0.00%