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	1,708,320	100.0%
Number of Servers that didn't respond	312,728	18.31%
Server didn't open socket	305,292	17.87%
Server didn't provide banner	7,436	0.44%
Server provided banner	1,395,592	81.69%
Server banner identifies software in use	867,831	50.80%

As indicated by the above table, of the 1,708,320 servers queried, only 867,831 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	494,855	57.02%
Postfix	303,245	34.94%
Sendmail	33,609	3.87%
MailEnable	18,280	2.11%
MDaemon	6,967	0.80%
Microsoft	4,331	0.50%
IMail	1,251	0.14%
CommuniGate Pro	1,218	0.14%
XMail	747	0.09%
Qmail Toaster	593	0.07%
Lotus Domino	477	0.05%
SurgeSMTP	476	0.05%
WinWebMail	452	0.05%
OpenSMTPD	390	0.04%
Kerio	229	0.03%
MagicMail	152	0.02%
Merak	148	0.02%
Post.Office	119	0.01%
ArGoSoft	100	0.01%
GroupWise	60	0.01%
Gordano Messaging Suite (GMS)	49	0.01%
Trend Micro	42	0.00%
VisNetic	9	0.00%
OpenVMS	8	0.00%
InterScan VirusWall	8	0.00%
Interscan	4	0.00%
Mercury	3	0.00%
WebSTAR V	3	0.00%
ModusMail	2	0.00%
MessageWall	2	0.00%
Neon Mail Server	1	0.00%
Mirapoint	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (494,855 servers)
Version	Number of Servers	Percent
4.92	367,029	74.17%
4.91	37,954	7.67%
4.92.3	27,002	5.46%
4.87	11,137	2.25%
4.89	9,184	1.86%
4.84	7,621	1.54%
4.92.2	6,725	1.36%
4.90	5,404	1.09%
Other	22,799	4.61%
Postfix (303,245 servers)
Version	Number of Servers	Percent
Other	303,245	100.00%
Sendmail (33,609 servers)
Version	Number of Servers	Percent
8.15.2	13,086	38.94%
8.14.4	6,328	18.83%
8.13.8	3,189	9.49%
8.14.7	2,869	8.54%
8.14.5	2,533	7.54%
8.13.1	2,062	6.14%
8.14.9	884	2.63%
8.14.3	646	1.92%
Other	2,012	5.99%
MailEnable (18,280 servers)
Version	Number of Servers	Percent
10.25--	6,080	33.26%
10.27--	1,034	5.66%
9.00--	1,014	5.55%
10.12--	472	2.58%
9.16--	353	1.93%
8.60--	331	1.81%
8.53--	247	1.35%
6.5--	242	1.32%
10.20--	239	1.31%
8.60-8.60-	224	1.23%
10.26--	221	1.21%
8.51--	197	1.08%
10.27--10.27	191	1.04%
9.00--9.00	189	1.03%
10.25-10.25-	187	1.02%
10.25--10.25	184	1.01%
Other	6,875	37.61%
MDaemon (6,967 servers)
Version	Number of Servers	Percent
19.5.1	732	10.51%
13.5.1	444	6.37%
13.6.3	390	5.60%
19.0.3	338	4.85%
13.0.4	297	4.26%
13.0.5	274	3.93%
11.0.3	257	3.69%
11.0.0	256	3.67%
16.5.2	215	3.09%
19.5.0	170	2.44%
12.5.6	155	2.22%
12.5.4	154	2.21%
14.5.2	139	2.00%
18.5.3	94	1.35%
10.0.0	94	1.35%
10.1.2	93	1.33%
15.0.3	86	1.23%
18.5.1	85	1.22%
16.0.4	83	1.19%
18.5.2	74	1.06%
10.1.0	70	1.00%
Other	2,467	35.41%
Microsoft (4,331 servers)
Version	Number of Servers	Percent
6.0.3790.4675	1,912	44.15%
8.5.9600.16384	617	14.25%
7.5.7601.17514	528	12.19%
10.0.14393.2608	256	5.91%
6.0.3790.3959	241	5.56%
5.0.2195.5329	132	3.05%
8.0.9200.16384	130	3.00%
7.0.6002.18264	69	1.59%
6.0.3790.1830	68	1.57%
5.0.2195.6713	54	1.25%
5.0.2195.7381	45	1.04%
10.0.17763.1	45	1.04%
Other	234	5.40%
IMail (1,251 servers)
Version	Number of Servers	Percent
12.5.7.59	187	14.95%
12.5.6.101	177	14.15%
12.4.1.15	118	9.43%
9.23	76	6.08%
12.5.3.93	69	5.52%
12.5.5.115	61	4.88%
8.22	58	4.64%
12.3.0.100	54	4.32%
8.15	49	3.92%
8.05	41	3.28%
12.5.4.146	34	2.72%
12.5.7.58	32	2.56%
11.03	31	2.48%
10.02	22	1.76%
12.5.6.105	21	1.68%
12.5.5.117	21	1.68%
11.5	18	1.44%
7.15	15	1.20%
10.01	14	1.12%
Other	153	12.23%
CommuniGate Pro (1,218 servers)
Version	Number of Servers	Percent
6.2.14.	70	5.75%
6.2.14	50	4.11%
6.2.12	40	3.28%
5.3.13.	33	2.71%
6.2.12.	32	2.63%
6.0.11.	25	2.05%
6.1.16	24	1.97%
5.2.20.	23	1.89%
6.0.11	22	1.81%
5.4.11.	22	1.81%
5.1.16	21	1.72%
6.1.20	21	1.72%
6.2.13	20	1.64%
5.4.11	19	1.56%
6.0.9	18	1.48%
6.1.18	18	1.48%
6.1.20.	17	1.40%
6.2.10	17	1.40%
6.1.16.	16	1.31%
6.1.2.	14	1.15%
6.2.13.	14	1.15%
5.2.20	13	1.07%
Other	669	54.93%
XMail (747 servers)
Version	Number of Servers	Percent
1.27	371	49.67%
1.22	242	32.40%
1.26	40	5.35%
1.25	36	4.82%
1.24	25	3.35%
Other	33	4.42%
Qmail Toaster (593 servers)
Version	Number of Servers	Percent
1.3	420	70.83%
1.03	160	26.98%
1.03.5	6	1.01%
Other	7	1.18%
Lotus Domino (477 servers)
Version	Number of Servers	Percent
8.5.3FP6	103	21.59%
8.5.3	64	13.42%
8.5.2	21	4.40%
7.0.2	19	3.98%
8.5	18	3.77%
8.5.1	15	3.14%
7.0	12	2.52%
8.5.2FP2	11	2.31%
8.5.3FP1	11	2.31%
8.5.3FP3	11	2.31%
7.0.3	10	2.10%
8.5.3FP2	10	2.10%
8.5.2FP3	10	2.10%
8.0.1	9	1.89%
8.5.3FP4	9	1.89%
8.5.2FP4	9	1.89%
8.0	8	1.68%
8.5.1FP5	7	1.47%
6.5.4	6	1.26%
8.5.2FP4HF759	6	1.26%
6.5	5	1.05%
8.5.3FP5	5	1.05%
7.0.1	5	1.05%
7.0.4FP2	5	1.05%
8.5.1FP4	5	1.05%
6.5.3	5	1.05%
6.5.5	5	1.05%
Other	73	15.30%
SurgeSMTP (476 servers)
Version	Number of Servers	Percent
7.3o4-4	173	36.34%
7.3e2-2	54	11.34%
7.1e-1	27	5.67%
7.3i2-2	22	4.62%
6.5a2-2	21	4.41%
7.4a-1	20	4.20%
6.7c-1	15	3.15%
7.2i-1	15	3.15%
7.2a-1	14	2.94%
3.9e-1	9	1.89%
6.9c-1	8	1.68%
7.2e-2	6	1.26%
7.0c2-2	6	1.26%
6.5a-1	5	1.05%
4.0u4-4	5	1.05%
Other	76	15.97%
WinWebMail (452 servers)
Version	Number of Servers	Percent
4.2.0.1	88	19.47%
3.9.0.7	75	16.59%
3.8.1.3	51	11.28%
3.9.0.1	36	7.96%
3.8.0.1	23	5.09%
4.1.0.1	16	3.54%
3.7.6.1	16	3.54%
3.8.1.5	16	3.54%
4.0.0.1	14	3.10%
3.8.1.1	11	2.43%
3.7.3.1	10	2.21%
3.8.5.1	10	2.21%
3.9.3.1	9	1.99%
3.9.2.1	9	1.99%
3.8.3.1	8	1.77%
3.8.6.1	7	1.55%
3.7.7.3	6	1.33%
3.9.5.3	6	1.33%
3.7.1.1	6	1.33%
1.0	5	1.11%
3.7.0.5	5	1.11%
3.8.2.1	5	1.11%
Other	20	4.42%
OpenSMTPD (390 servers)
Version	Number of Servers	Percent
Other	390	100.00%
Kerio (229 servers)
Version	Number of Servers	Percent
6.7.3	54	23.58%
6.7.0	30	13.10%
6.7.2	23	10.04%
6.5.2	21	9.17%
6.6.2	20	8.73%
6.5.0	11	4.80%
6.6.1	10	4.37%
6.7.1	9	3.93%
6.4.1	8	3.49%
6.4.0	7	3.06%
6.3.1	6	2.62%
6.5.1	4	1.75%
6.6.0	4	1.75%
6.1.0	4	1.75%
6.3.0	3	1.31%
6.1.3	3	1.31%
Other	12	5.24%
MagicMail (152 servers)
Version	Number of Servers	Percent
Other	152	100.00%
Merak (148 servers)
Version	Number of Servers	Percent
8.0.3	38	25.68%
8.9.1	33	22.30%
7.6.1	10	6.76%
8.5.0	9	6.08%
7.4.5	8	5.41%
8.3.8	7	4.73%
9.0.3	7	4.73%
7.5.2	4	2.70%
7.6.4	4	2.70%
7.6.0	3	2.03%
7.0.1	3	2.03%
6.0.8	3	2.03%
7.4.2	2	1.35%
4.4.1	2	1.35%
Other	15	10.14%
Post.Office (119 servers)
Version	Number of Servers	Percent
4.3	32	26.89%
4.2.2	21	17.65%
4.4	16	13.45%
4.1.2.4	13	10.92%
3.5.3	7	5.88%
4.2.1.3	5	4.20%
3.5.3J	3	2.52%
3.5.1	3	2.52%
4.1.1	2	1.68%
4.2.1.1	2	1.68%
3.8.7.4	2	1.68%
Other	13	10.92%
ArGoSoft (100 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	31	31.00%
1.8 (1.8.9.3)	17	17.00%
1.8 (1.8.9.5)	13	13.00%
1.8 (1.8.9.1)	7	7.00%
1.8 (1.8.8.8)	3	3.00%
1.8 (1.8.7.3)	3	3.00%
1.8 (1.8.7.6)	3	3.00%
1.8 (1.8.6.0)	3	3.00%
1.8 (1.8.8.9)	2	2.00%
1.8 (1.8.8.7)	2	2.00%
1.8 (1.8.8.4)	2	2.00%
1.8 (1.8.5.8)	2	2.00%
1.8 (1.8.9.2)	2	2.00%
1.8 (1.8.6.1)	1	1.00%
1.8 (1.8.5.5)	1	1.00%
1.8 (1.8.5.9)	1	1.00%
1.8 (1.8.9.0)	1	1.00%
1.8 (1.8.9.4)	1	1.00%
1.8 (1.8.3.5)	1	1.00%
1.8 (1.8.1.1)	1	1.00%
1.8 (1.8.2.1)	1	1.00%
1.8 (1.8.1.7)	1	1.00%
1.8 (1.8.2.5)	1	1.00%
Other	0	0.00%
GroupWise (60 servers)
Version	Number of Servers	Percent
18.1.1	12	20.00%
14.2.2	8	13.33%
14.2.1	5	8.33%
14.2.3	5	8.33%
18.1.0	5	8.33%
14.0.1	4	6.67%
18.0.2	4	6.67%
14.2.0	3	5.00%
6.5.7	2	3.33%
8.0.3	2	3.33%
18.2.0	2	3.33%
6.5.0	1	1.67%
6.5.5	1	1.67%
12.0.1	1	1.67%
7.0.1	1	1.67%
18.0.1	1	1.67%
14.0.0	1	1.67%
6.5.6	1	1.67%
6.0.2	1	1.67%
Other	0	0.00%
Gordano Messaging Suite (GMS) (49 servers)
Version	Number of Servers	Percent
Other	49	100.00%
Trend Micro (42 servers)
Version	Number of Servers	Percent
5.7	11	26.19%
5.18	11	26.19%
5.5	5	11.90%
7.5	5	11.90%
7.0	5	11.90%
7.1	2	4.76%
7.5ready	1	2.38%
8	1	2.38%
9.0	1	2.38%
Other	0	0.00%
VisNetic (9 servers)
Version	Number of Servers	Percent
9.3.2.0	7	77.78%
8.0.3	1	11.11%
5.5.8.3	1	11.11%
Other	0	0.00%
OpenVMS (8 servers)
Version	Number of Servers	Percent
8.4	3	37.50%
7.3	3	37.50%
8.3	1	12.50%
8.2	1	12.50%
Other	0	0.00%
InterScan VirusWall (8 servers)
Version	Number of Servers	Percent
Other	8	100.00%
Interscan (4 servers)
Version	Number of Servers	Percent
3.81-Build_1022	2	50.00%
3.8-Build_3013	1	25.00%
3.8-Build_1080	1	25.00%
Other	0	0.00%
Mercury (3 servers)
Version	Number of Servers	Percent
1.48	2	66.67%
3.32	1	33.33%
Other	0	0.00%
WebSTAR V (3 servers)
Version	Number of Servers	Percent
5.4.1	3	100.00%
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%
Neon Mail Server (1 servers)
Version	Number of Servers	Percent
3.1.2	1	100.00%
Other	0	0.00%
Mirapoint (1 servers)
Version	Number of Servers	Percent
4.4.6-GA	1	100.00%
Other	0	0.00%