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	1,929,497	100.0%
Number of Servers that didn't respond	346,271	17.95%
Server didn't open socket	339,268	17.58%
Server didn't provide banner	7,003	0.36%
Server provided banner	1,583,226	82.05%
Server banner identifies software in use	978,435	50.71%

As indicated by the above table, of the 1,929,497 servers queried, only 978,435 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	556,213	56.85%
Postfix	330,622	33.79%
Sendmail	42,700	4.36%
MailEnable	21,796	2.23%
MDaemon	10,229	1.05%
Microsoft	7,749	0.79%
IMail	1,901	0.19%
CommuniGate Pro	1,564	0.16%
XMail	955	0.10%
Lotus Domino	782	0.08%
WinWebMail	759	0.08%
Qmail Toaster	720	0.07%
SurgeSMTP	636	0.07%
Kerio	372	0.04%
OpenSMTPD	325	0.03%
Merak	239	0.02%
ArGoSoft	179	0.02%
MagicMail	178	0.02%
Post.Office	148	0.02%
Gordano Messaging Suite (GMS)	101	0.01%
GroupWise	97	0.01%
Trend Micro	62	0.01%
InterScan VirusWall	25	0.00%
VisNetic	22	0.00%
OpenVMS	18	0.00%
Mirapoint	11	0.00%
Mercury	8	0.00%
Interscan	6	0.00%
WebSTAR V	6	0.00%
Neon Mail Server	5	0.00%
MessageWall	3	0.00%
ModusMail	2	0.00%
WebSTAR	2	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (556,213 servers)
Version	Number of Servers	Percent
4.89	418,206	75.19%
4.87	46,586	8.38%
4.90	19,758	3.55%
4.84	16,857	3.03%
4.80	7,008	1.26%
4.86	6,544	1.18%
4.85	6,018	1.08%
Other	35,236	6.33%
Postfix (330,622 servers)
Version	Number of Servers	Percent
Other	330,622	100.00%
Sendmail (42,700 servers)
Version	Number of Servers	Percent
8.14.5	11,766	27.56%
8.14.4	9,805	22.96%
8.13.8	6,233	14.60%
8.13.1	3,837	8.99%
8.15.2	2,842	6.66%
8.14.7	2,024	4.74%
8.14.3	1,599	3.74%
8.14.9	1,278	2.99%
8.14.2	428	1.00%
Other	2,888	6.76%
MailEnable (21,796 servers)
Version	Number of Servers	Percent
9.00--	2,889	13.25%
9.16--	2,194	10.07%
8.60--	962	4.41%
8.53--	868	3.98%
6.5--	704	3.23%
8.51--	615	2.82%
1.986--	439	2.01%
8.04--	434	1.99%
8.60-8.60-	399	1.83%
9.75--	386	1.77%
8.50--	281	1.29%
5.10--	267	1.22%
10.11--	252	1.16%
8.00--	238	1.09%
9.53--	229	1.05%
9.74--	226	1.04%
Other	10,413	47.77%
MDaemon (10,229 servers)
Version	Number of Servers	Percent
17.5.2	1,102	10.77%
13.5.1	565	5.52%
16.5.2	529	5.17%
13.6.3	492	4.81%
11.0.3	413	4.04%
13.0.4	413	4.04%
11.0.0	412	4.03%
13.0.5	399	3.90%
17.5.1	387	3.78%
16.0.4	264	2.58%
17.0.2	253	2.47%
12.5.6	221	2.16%
12.5.4	200	1.96%
15.0.3	182	1.78%
14.5.2	182	1.78%
16.5.1	177	1.73%
10.1.2	159	1.55%
10.0.0	156	1.53%
16.0.1	126	1.23%
17.0.3	111	1.09%
15.5.3	110	1.08%
10.1.1	107	1.05%
10.1.0	106	1.04%
13.0.2	103	1.01%
Other	3,060	29.91%
Microsoft (7,749 servers)
Version	Number of Servers	Percent
6.0.3790.4675	4,375	56.46%
7.5.7601.17514	994	12.83%
8.5.9600.16384	757	9.77%
6.0.3790.3959	517	6.67%
8.0.9200.16384	191	2.46%
5.0.2195.5329	151	1.95%
7.0.6002.18264	134	1.73%
6.0.3790.1830	129	1.66%
10.0.14393.0	97	1.25%
Other	404	5.21%
IMail (1,901 servers)
Version	Number of Servers	Percent
12.5.5.115	223	11.73%
8.22	203	10.68%
12.5.6.101	195	10.26%
12.4.1.15	151	7.94%
9.23	125	6.58%
12.5.4.146	124	6.52%
12.5.3.93	113	5.94%
12.3.0.100	93	4.89%
8.15	83	4.37%
8.05	60	3.16%
11.03	53	2.79%
11.5	42	2.21%
12.5.5.117	28	1.47%
7.07	27	1.42%
12.5.1.60	25	1.32%
7.15	23	1.21%
10.02	22	1.16%
Other	311	16.36%
CommuniGate Pro (1,564 servers)
Version	Number of Servers	Percent
6.1.16	104	6.65%
6.1.18	88	5.63%
6.2.1	73	4.67%
6.0.11	59	3.77%
5.4.11	59	3.77%
6.1.11	50	3.20%
5.2.20	48	3.07%
5.1.16	44	2.81%
6.2.0	42	2.69%
6.1.10	40	2.56%
6.0.9	37	2.37%
6.1.17	35	2.24%
5.3.13	34	2.17%
6.1.2	32	2.05%
5.2.3	30	1.92%
5.0.14	30	1.92%
6.1.15	29	1.85%
6.2	29	1.85%
6.1.19	26	1.66%
6.1.13	24	1.53%
6.1.14	24	1.53%
4.1.8	23	1.47%
6.1.12	22	1.41%
6.1.8	18	1.15%
5.3.15	17	1.09%
6.0.10	17	1.09%
6.1.5	16	1.02%
6.1.9	16	1.02%
5.4.4	16	1.02%
Other	482	30.82%
XMail (955 servers)
Version	Number of Servers	Percent
1.27	429	44.92%
1.22	299	31.31%
1.25	67	7.02%
1.26	64	6.70%
1.24	33	3.46%
1.21	18	1.88%
1.23	13	1.36%
Other	32	3.35%
Lotus Domino (782 servers)
Version	Number of Servers	Percent
8.5.3FP6	157	20.08%
8.5.3	106	13.55%
8.5.2	35	4.48%
7.0.2	30	3.84%
8.5	24	3.07%
8.5.1	24	3.07%
8.5.3FP4	22	2.81%
8.5.3FP1	22	2.81%
8.5.3FP2	20	2.56%
7.0.3	17	2.17%
8.5.3FP3	17	2.17%
8.5.2FP4	16	2.05%
8.5.2FP3	16	2.05%
8.0.1	15	1.92%
8.5.2FP2	14	1.79%
8.5.1FP5	13	1.66%
7.0	12	1.53%
8.5.3FP5	12	1.53%
6.5	11	1.41%
7.0.1	11	1.41%
6.5.1	11	1.41%
8.0	11	1.41%
6.5.4	9	1.15%
7.0.4	8	1.02%
8.0.2	8	1.02%
7.0.3FP1	8	1.02%
Other	133	17.01%
WinWebMail (759 servers)
Version	Number of Servers	Percent
3.9.0.7	168	22.13%
3.8.1.3	106	13.97%
3.9.0.1	56	7.38%
3.8.0.1	43	5.67%
3.7.6.1	38	5.01%
3.8.1.5	35	4.61%
3.9.5.3	30	3.95%
3.8.5.1	26	3.43%
3.7.3.1	25	3.29%
3.9.3.1	24	3.16%
3.9.2.1	23	3.03%
3.8.1.1	22	2.90%
3.7.7.3	19	2.50%
3.8.6.1	18	2.37%
3.8.3.1	16	2.11%
3.9.5.1	16	2.11%
4.0.0.1	16	2.11%
3.8.2.1	13	1.71%
3.7.1.1	10	1.32%
3.7.5.1	8	1.05%
Other	47	6.19%
Qmail Toaster (720 servers)
Version	Number of Servers	Percent
1.3	582	80.83%
1.03	98	13.61%
1.2	12	1.67%
1.03.6	11	1.53%
1.03.5	11	1.53%
Other	6	0.83%
SurgeSMTP (636 servers)
Version	Number of Servers	Percent
7.3e2-2	167	26.26%
7.1e-1	71	11.16%
7.2i-1	39	6.13%
6.5a2-2	37	5.82%
6.9c-1	32	5.03%
6.7c-1	27	4.25%
7.2a-1	26	4.09%
7.3c3-3	23	3.62%
6.5a-1	20	3.14%
7.2e-2	19	2.99%
7.0c2-2	17	2.67%
3.9e-1	16	2.52%
5.2a-1	14	2.20%
7.3d-5	9	1.42%
6.1c-1	9	1.42%
7.3f-16	8	1.26%
6.4a-1	8	1.26%
4.0u4-4	8	1.26%
6.3c2-2	7	1.10%
Other	79	12.42%
Kerio (372 servers)
Version	Number of Servers	Percent
6.7.3	73	19.62%
6.7.0	52	13.98%
6.5.2	40	10.75%
6.6.2	35	9.41%
6.7.2	29	7.80%
6.6.1	19	5.11%
6.5.0	18	4.84%
6.7.1	16	4.30%
6.4.1	15	4.03%
6.3.1	10	2.69%
6.4.0	9	2.42%
6.3.0	8	2.15%
6.5.1	8	2.15%
6.6.0	7	1.88%
6.1.3	5	1.34%
6.4.2	4	1.08%
5.7.9	4	1.08%
Other	20	5.38%
OpenSMTPD (325 servers)
Version	Number of Servers	Percent
Other	325	100.00%
Merak (239 servers)
Version	Number of Servers	Percent
8.0.3	70	29.29%
8.9.1	43	17.99%
8.5.0	17	7.11%
7.5.2	14	5.86%
8.3.8	14	5.86%
7.6.1	12	5.02%
7.4.5	12	5.02%
7.6.4	9	3.77%
9.0.3	4	1.67%
7.2.0	4	1.67%
7.4.2	3	1.26%
4.2.1	3	1.26%
7.6.0	3	1.26%
6.0.8	3	1.26%
Other	28	11.72%
ArGoSoft (179 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	65	36.31%
1.8 (1.8.9.5)	22	12.29%
1.8 (1.8.9.3)	21	11.73%
1.8 (1.8.9.1)	16	8.94%
1.8 (1.8.9.2)	6	3.35%
1.8 (1.8.7.3)	5	2.79%
1.8 (1.8.8.8)	5	2.79%
1.8 (1.8.8.7)	5	2.79%
1.8 (1.8.8.9)	4	2.23%
1.8 (1.8.9.4)	3	1.68%
1.8 (1.8.6.0)	3	1.68%
1.8 (1.8.7.6)	2	1.12%
1.8 (1.8.8.4)	2	1.12%
1.8 (1.8.5.8)	2	1.12%
1.8 (1.8.2.1)	2	1.12%
1.8 (1.8.6.1a	2	1.12%
1.8 (1.8.5.9)	2	1.12%
Other	12	6.70%
MagicMail (178 servers)
Version	Number of Servers	Percent
Other	178	100.00%
Post.Office (148 servers)
Version	Number of Servers	Percent
4.3	34	22.97%
4.2.2	29	19.59%
3.5.3	14	9.46%
4.1.2.4	14	9.46%
4.2.1.3	10	6.76%
3.9.2.3	5	3.38%
4.1.1	4	2.70%
3.1.2	4	2.70%
4.2.1.1	3	2.03%
3.5.1	3	2.03%
3.5.3J	3	2.03%
3.5.4	2	1.35%
4.0.1	2	1.35%
4.1.0.3	2	1.35%
3.8.7.4	2	1.35%
Other	17	11.49%
Gordano Messaging Suite (GMS) (101 servers)
Version	Number of Servers	Percent
Other	101	100.00%
GroupWise (97 servers)
Version	Number of Servers	Percent
14.2.2	26	26.80%
14.2.1	9	9.28%
6.5.7	8	8.25%
14.2.0	7	7.22%
18.0.0	7	7.22%
7.0.3	5	5.15%
14.0.1	5	5.15%
8.0.3	4	4.12%
7.0.2	3	3.09%
14.0.0	3	3.09%
7.0.4	3	3.09%
6.5.4	2	2.06%
6.5.5	2	2.06%
6.0.2	2	2.06%
6.0.4	2	2.06%
6.5.0	1	1.03%
6.0.3	1	1.03%
7.0.1	1	1.03%
8.0.0	1	1.03%
8.0.1	1	1.03%
14.0.2	1	1.03%
12.0.2	1	1.03%
12.0.1	1	1.03%
18.0.1	1	1.03%
Other	0	0.00%
Trend Micro (62 servers)
Version	Number of Servers	Percent
5.7	20	32.26%
5.18	12	19.35%
5.5	10	16.13%
7.0	8	12.90%
7.5	5	8.06%
3.53	2	3.23%
7.1	1	1.61%
8.5	1	1.61%
7.5ready	1	1.61%
8	1	1.61%
9.0	1	1.61%
Other	0	0.00%
InterScan VirusWall (25 servers)
Version	Number of Servers	Percent
Other	25	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%
5.5.8.3	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%
8.0.3.1	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 (11 servers)
Version	Number of Servers	Percent
4.4.2a-FCS	2	18.18%
4.3.5-GA	2	18.18%
4.4.3-GA	2	18.18%
4.1.9-GA	1	9.09%
4.3.6-GA	1	9.09%
3.10.10a-GA	1	9.09%
4.4.3a-GA	1	9.09%
4.4.5-GA	1	9.09%
Other	0	0.00%
Mercury (8 servers)
Version	Number of Servers	Percent
3.32	4	50.00%
1.48	3	37.50%
3.21	1	12.50%
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 (3 servers)
Version	Number of Servers	Percent
1.0.8	3	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%