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	1,999,755	100.0%
Number of Servers that didn't respond	375,395	18.77%
Server didn't open socket	368,068	18.41%
Server didn't provide banner	7,327	0.37%
Server provided banner	1,624,360	81.23%
Server banner identifies software in use	1,005,637	50.29%

As indicated by the above table, of the 1,999,755 servers queried, only 1,005,637 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	570,961	56.78%
Postfix	339,631	33.77%
Sendmail	44,552	4.43%
MailEnable	22,318	2.22%
MDaemon	10,585	1.05%
Microsoft	8,095	0.80%
IMail	1,991	0.20%
CommuniGate Pro	1,598	0.16%
XMail	995	0.10%
WinWebMail	841	0.08%
Lotus Domino	820	0.08%
Qmail Toaster	741	0.07%
SurgeSMTP	645	0.06%
Kerio	394	0.04%
OpenSMTPD	312	0.03%
Merak	255	0.03%
ArGoSoft	188	0.02%
MagicMail	180	0.02%
Post.Office	155	0.02%
GroupWise	103	0.01%
Gordano Messaging Suite (GMS)	102	0.01%
Trend Micro	60	0.01%
InterScan VirusWall	26	0.00%
VisNetic	22	0.00%
OpenVMS	18	0.00%
Mirapoint	15	0.00%
Mercury	9	0.00%
Interscan	6	0.00%
WebSTAR V	6	0.00%
Neon Mail Server	5	0.00%
MessageWall	4	0.00%
ModusMail	2	0.00%
WebSTAR	2	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (570,961 servers)
Version	Number of Servers	Percent
4.89	436,729	76.49%
4.87	49,679	8.70%
4.84	17,769	3.11%
4.90	8,973	1.57%
4.80	7,465	1.31%
4.86	6,776	1.19%
4.85	6,313	1.11%
4.72	5,879	1.03%
Other	31,378	5.50%
Postfix (339,631 servers)
Version	Number of Servers	Percent
Other	339,631	100.00%
Sendmail (44,552 servers)
Version	Number of Servers	Percent
8.14.5	12,073	27.10%
8.14.4	10,113	22.70%
8.13.8	6,557	14.72%
8.13.1	4,041	9.07%
8.15.2	3,180	7.14%
8.14.7	2,031	4.56%
8.14.3	1,812	4.07%
8.14.9	1,264	2.84%
Other	3,481	7.81%
MailEnable (22,318 servers)
Version	Number of Servers	Percent
9.00--	2,962	13.27%
9.16--	2,139	9.58%
8.60--	1,029	4.61%
8.53--	899	4.03%
6.5--	742	3.32%
8.51--	628	2.81%
1.986--	464	2.08%
8.04--	449	2.01%
9.75--	402	1.80%
8.60-8.60-	400	1.79%
8.50--	297	1.33%
5.10--	279	1.25%
8.00--	250	1.12%
9.74--	249	1.12%
9.53--	245	1.10%
10.11--	242	1.08%
Other	10,642	47.68%
MDaemon (10,585 servers)
Version	Number of Servers	Percent
17.5.2	1,014	9.58%
13.5.1	575	5.43%
16.5.2	565	5.34%
13.6.3	500	4.72%
17.5.1	448	4.23%
13.0.4	437	4.13%
11.0.0	431	4.07%
11.0.3	421	3.98%
13.0.5	404	3.82%
17.0.2	289	2.73%
16.0.4	278	2.63%
12.5.6	226	2.14%
12.5.4	216	2.04%
15.0.3	195	1.84%
14.5.2	191	1.80%
16.5.1	183	1.73%
10.1.2	165	1.56%
10.0.0	165	1.56%
16.0.1	126	1.19%
17.0.3	119	1.12%
15.5.3	119	1.12%
10.1.1	112	1.06%
10.1.0	110	1.04%
13.0.2	109	1.03%
17.5.0	109	1.03%
Other	3,078	29.08%
Microsoft (8,095 servers)
Version	Number of Servers	Percent
6.0.3790.4675	4,597	56.79%
7.5.7601.17514	1,022	12.63%
8.5.9600.16384	788	9.73%
6.0.3790.3959	554	6.84%
8.0.9200.16384	193	2.38%
5.0.2195.5329	153	1.89%
7.0.6002.18264	136	1.68%
6.0.3790.1830	129	1.59%
10.0.14393.0	102	1.26%
5.0.2195.6713	81	1.00%
Other	340	4.20%
IMail (1,991 servers)
Version	Number of Servers	Percent
12.5.5.115	238	11.95%
8.22	218	10.95%
12.5.6.101	186	9.34%
12.4.1.15	168	8.44%
12.5.4.146	130	6.53%
9.23	127	6.38%
12.5.3.93	117	5.88%
12.3.0.100	100	5.02%
8.15	85	4.27%
8.05	65	3.26%
11.03	54	2.71%
11.5	48	2.41%
12.5.5.117	32	1.61%
12.5.1.60	25	1.26%
7.07	25	1.26%
7.15	24	1.21%
10.02	23	1.16%
11.02	20	1.00%
Other	306	15.37%
CommuniGate Pro (1,598 servers)
Version	Number of Servers	Percent
6.1.16	104	6.51%
6.1.18	89	5.57%
5.4.11	62	3.88%
6.2.1	60	3.75%
6.0.11	59	3.69%
6.1.11	54	3.38%
5.2.20	51	3.19%
6.2.0	45	2.82%
5.1.16	44	2.75%
6.1.10	44	2.75%
6.0.9	40	2.50%
6.1.17	39	2.44%
6.2	37	2.32%
5.3.13	36	2.25%
6.1.2	32	2.00%
5.0.14	31	1.94%
5.2.3	31	1.94%
6.1.15	30	1.88%
6.1.13	25	1.56%
6.1.14	24	1.50%
6.1.19	24	1.50%
4.1.8	23	1.44%
6.1.12	23	1.44%
6.1.8	20	1.25%
6.1.5	18	1.13%
6.0.10	18	1.13%
5.3.15	17	1.06%
6.1.9	16	1.00%
5.4.4	16	1.00%
Other	486	30.41%
XMail (995 servers)
Version	Number of Servers	Percent
1.27	439	44.12%
1.22	315	31.66%
1.25	69	6.93%
1.26	68	6.83%
1.24	37	3.72%
1.21	19	1.91%
1.23	14	1.41%
Other	34	3.42%
WinWebMail (841 servers)
Version	Number of Servers	Percent
3.9.0.7	189	22.47%
3.8.1.3	122	14.51%
3.9.0.1	65	7.73%
3.7.6.1	48	5.71%
3.8.0.1	46	5.47%
3.8.1.5	37	4.40%
3.9.5.3	34	4.04%
3.7.3.1	27	3.21%
3.8.5.1	27	3.21%
3.8.1.1	24	2.85%
3.9.3.1	23	2.73%
3.9.2.1	22	2.62%
3.7.7.3	22	2.62%
3.9.5.1	19	2.26%
3.8.6.1	17	2.02%
3.8.3.1	16	1.90%
3.8.2.1	14	1.66%
4.0.0.1	13	1.55%
3.7.1.1	13	1.55%
3.7.5.1	10	1.19%
Other	53	6.30%
Lotus Domino (820 servers)
Version	Number of Servers	Percent
8.5.3FP6	162	19.76%
8.5.3	112	13.66%
8.5.2	36	4.39%
7.0.2	35	4.27%
8.5	27	3.29%
8.5.1	27	3.29%
8.5.3FP1	21	2.56%
8.5.3FP2	20	2.44%
8.5.3FP4	20	2.44%
7.0.3	19	2.32%
8.5.3FP3	19	2.32%
8.5.2FP4	18	2.20%
8.5.2FP3	17	2.07%
8.0.1	17	2.07%
8.5.2FP2	16	1.95%
8.5.3FP5	14	1.71%
8.0	13	1.59%
6.5.1	12	1.46%
7.0.1	11	1.34%
8.5.1FP5	11	1.34%
7.0	10	1.22%
6.5	10	1.22%
7.0.4	9	1.10%
Other	164	20.00%
Qmail Toaster (741 servers)
Version	Number of Servers	Percent
1.3	606	81.78%
1.03	95	12.82%
1.2	11	1.48%
1.03.6	11	1.48%
1.03.5	11	1.48%
Other	7	0.94%
SurgeSMTP (645 servers)
Version	Number of Servers	Percent
7.3e2-2	152	23.57%
7.1e-1	73	11.32%
7.2i-1	46	7.13%
6.5a2-2	38	5.89%
6.9c-1	30	4.65%
7.3c3-3	29	4.50%
7.2a-1	29	4.50%
6.7c-1	26	4.03%
6.5a-1	20	3.10%
7.2e-2	20	3.10%
7.0c2-2	17	2.64%
3.9e-1	16	2.48%
5.2a-1	13	2.02%
7.3d-5	10	1.55%
6.1c-1	10	1.55%
7.3f-16	10	1.55%
4.0u4-4	8	1.24%
6.4a-1	7	1.09%
Other	91	14.11%
Kerio (394 servers)
Version	Number of Servers	Percent
6.7.3	77	19.54%
6.7.0	55	13.96%
6.5.2	41	10.41%
6.6.2	36	9.14%
6.7.2	28	7.11%
6.5.0	22	5.58%
6.6.1	20	5.08%
6.4.1	16	4.06%
6.7.1	16	4.06%
6.3.1	13	3.30%
6.4.0	10	2.54%
6.3.0	8	2.03%
6.5.1	8	2.03%
6.6.0	8	2.03%
6.1.3	6	1.52%
6.4.2	4	1.02%
6.0.8	4	1.02%
5.7.9	4	1.02%
Other	18	4.57%
OpenSMTPD (312 servers)
Version	Number of Servers	Percent
Other	312	100.00%
Merak (255 servers)
Version	Number of Servers	Percent
8.0.3	74	29.02%
8.9.1	44	17.25%
8.5.0	19	7.45%
7.5.2	15	5.88%
8.3.8	14	5.49%
7.4.5	13	5.10%
7.6.1	12	4.71%
7.6.4	9	3.53%
7.0.1	4	1.57%
9.0.3	4	1.57%
7.2.0	4	1.57%
7.4.2	3	1.18%
5.9.4	3	1.18%
4.2.1	3	1.18%
7.6.0	3	1.18%
6.1.0	3	1.18%
6.0.8	3	1.18%
Other	25	9.80%
ArGoSoft (188 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	68	36.17%
1.8 (1.8.9.5)	22	11.70%
1.8 (1.8.9.3)	19	10.11%
1.8 (1.8.9.1)	19	10.11%
1.8 (1.8.7.3)	6	3.19%
1.8 (1.8.9.2)	6	3.19%
1.8 (1.8.8.7)	6	3.19%
1.8 (1.8.8.8)	5	2.66%
1.8 (1.8.8.9)	4	2.13%
1.8 (1.8.6.0)	4	2.13%
1.8 (1.8.9.4)	3	1.60%
1.8 (1.8.7.6)	2	1.06%
1.8 (1.8.8.4)	2	1.06%
1.8 (1.8.5.8)	2	1.06%
1.8 (1.8.2.1)	2	1.06%
1.8 (1.8.6.1a	2	1.06%
1.8 (1.8.5.9)	2	1.06%
Other	14	7.45%
MagicMail (180 servers)
Version	Number of Servers	Percent
Other	180	100.00%
Post.Office (155 servers)
Version	Number of Servers	Percent
4.3	34	21.94%
4.2.2	30	19.35%
4.1.2.4	18	11.61%
3.5.3	15	9.68%
4.2.1.3	10	6.45%
4.1.1	4	2.58%
3.9.2.3	4	2.58%
4.2.1.1	4	2.58%
3.1.2	4	2.58%
4.0.1	3	1.94%
3.5.1	3	1.94%
3.5.3J	3	1.94%
3.5.4	2	1.29%
3.9.2	2	1.29%
4.2	2	1.29%
4.1.0.3	2	1.29%
Other	15	9.68%
GroupWise (103 servers)
Version	Number of Servers	Percent
14.2.2	27	26.21%
14.2.1	11	10.68%
14.2.0	8	7.77%
6.5.7	8	7.77%
7.0.3	6	5.83%
18.0.0	6	5.83%
14.0.1	5	4.85%
14.0.0	5	4.85%
8.0.3	4	3.88%
7.0.2	3	2.91%
6.5.4	2	1.94%
6.5.5	2	1.94%
7.0.4	2	1.94%
6.0.2	2	1.94%
6.0.4	2	1.94%
Other	10	9.71%
Gordano Messaging Suite (GMS) (102 servers)
Version	Number of Servers	Percent
Other	102	100.00%
Trend Micro (60 servers)
Version	Number of Servers	Percent
5.7	20	33.33%
5.5	10	16.67%
5.18	10	16.67%
7.0	8	13.33%
7.5	5	8.33%
3.53	2	3.33%
7.1	1	1.67%
8.5	1	1.67%
7.5ready	1	1.67%
8	1	1.67%
9.0	1	1.67%
Other	0	0.00%
InterScan VirusWall (26 servers)
Version	Number of Servers	Percent
Other	26	100.00%
VisNetic (22 servers)
Version	Number of Servers	Percent
9.3.2.0	7	31.82%
5.0.2.3	2	9.09%
5.8.6.6	2	9.09%
6.2.2.0	1	4.55%
8.0.3	1	4.55%
9.1.4.0	1	4.55%
8.5.0.5	1	4.55%
7.6.1.0	1	4.55%
9.1.4.1	1	4.55%
5.5.8.3	1	4.55%
8.0.3.1	1	4.55%
5.3.5.0	1	4.55%
5.0.2.0	1	4.55%
8.5.0.8	1	4.55%
Other	0	0.00%
OpenVMS (18 servers)
Version	Number of Servers	Percent
8.4	8	44.44%
7.3	7	38.89%
8.3	2	11.11%
8.2	1	5.56%
Other	0	0.00%
Mirapoint (15 servers)
Version	Number of Servers	Percent
4.4.6-GA	2	13.33%
4.4.2a-FCS	2	13.33%
4.3.5-GA	2	13.33%
4.4.3-GA	2	13.33%
4.4.7-GA	2	13.33%
4.1.9-GA	1	6.67%
4.3.6-GA	1	6.67%
3.10.10a-GA	1	6.67%
4.4.3a-GA	1	6.67%
4.4.5-GA	1	6.67%
Other	0	0.00%
Mercury (9 servers)
Version	Number of Servers	Percent
3.32	4	44.44%
1.48	4	44.44%
3.21	1	11.11%
Other	0	0.00%
Interscan (6 servers)
Version	Number of Servers	Percent
3.81-Build_1022	2	33.33%
3.81-Build_1084	1	16.67%
3.8-Build_3013	1	16.67%
3.8-Build_1080	1	16.67%
3.5 (build 1294)	1	16.67%
Other	0	0.00%
WebSTAR V (6 servers)
Version	Number of Servers	Percent
5.4.1	4	66.67%
5.3.2	1	16.67%
5.3.4	1	16.67%
Other	0	0.00%
Neon Mail Server (5 servers)
Version	Number of Servers	Percent
3.1.3	1	20.00%
3.0.7	1	20.00%
3.1.0	1	20.00%
3.1.5	1	20.00%
3.1.2	1	20.00%
Other	0	0.00%
MessageWall (4 servers)
Version	Number of Servers	Percent
1.0.8	4	100.00%
Other	0	0.00%
ModusMail (2 servers)
Version	Number of Servers	Percent
4.1.361.21	1	50.00%
4.35.477.8	1	50.00%
Other	0	0.00%
WebSTAR (2 servers)
Version	Number of Servers	Percent
Other	2	100.00%