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	1,803,256	100.0%
Number of Servers that didn't respond	304,976	16.91%
Server didn't open socket	298,997	16.58%
Server didn't provide banner	5,979	0.33%
Server provided banner	1,498,280	83.09%
Server banner identifies software in use	931,866	51.68%

As indicated by the above table, of the 1,803,256 servers queried, only 931,866 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	528,056	56.67%
Postfix	320,814	34.43%
Sendmail	39,372	4.23%
MailEnable	20,495	2.20%
MDaemon	8,882	0.95%
Microsoft	6,141	0.66%
IMail	1,669	0.18%
CommuniGate Pro	1,416	0.15%
XMail	908	0.10%
Lotus Domino	635	0.07%
WinWebMail	629	0.07%
Qmail Toaster	622	0.07%
SurgeSMTP	573	0.06%
OpenSMTPD	349	0.04%
Kerio	317	0.03%
Merak	210	0.02%
MagicMail	184	0.02%
Post.Office	141	0.02%
ArGoSoft	136	0.01%
GroupWise	86	0.01%
Gordano Messaging Suite (GMS)	83	0.01%
Trend Micro	55	0.01%
InterScan VirusWall	19	0.00%
OpenVMS	17	0.00%
VisNetic	17	0.00%
Mirapoint	11	0.00%
Mercury	7	0.00%
Interscan	6	0.00%
Neon Mail Server	5	0.00%
WebSTAR V	4	0.00%
MessageWall	3	0.00%
ModusMail	2	0.00%
WebSTAR	2	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (528,056 servers)
Version	Number of Servers	Percent
4.91	397,670	75.31%
4.89	33,617	6.37%
4.87	30,934	5.86%
4.90	14,855	2.81%
4.84	13,250	2.51%
4.80	5,590	1.06%
Other	32,140	6.09%
Postfix (320,814 servers)
Version	Number of Servers	Percent
Other	320,814	100.00%
Sendmail (39,372 servers)
Version	Number of Servers	Percent
8.15.2	11,648	29.58%
8.14.4	8,214	20.86%
8.13.8	5,115	12.99%
8.14.5	3,246	8.24%
8.13.1	3,206	8.14%
8.14.7	2,637	6.70%
8.14.9	1,634	4.15%
8.14.3	955	2.43%
Other	2,717	6.90%
MailEnable (20,495 servers)
Version	Number of Servers	Percent
10.12--	2,455	11.98%
9.00--	2,115	10.32%
9.16--	1,865	9.10%
8.60--	662	3.23%
8.53--	659	3.22%
6.5--	492	2.40%
8.51--	455	2.22%
10.18--	352	1.72%
10.16--	344	1.68%
8.60-8.60-	332	1.62%
8.04--	320	1.56%
1.986--	297	1.45%
9.75--	270	1.32%
10.15--	221	1.08%
10.14--	220	1.07%
9.00--9.00	216	1.05%
10.18--10.18	207	1.01%
Other	9,013	43.98%
MDaemon (8,882 servers)
Version	Number of Servers	Percent
18.0.2	873	9.83%
13.5.1	501	5.64%
13.6.3	433	4.88%
16.5.2	381	4.29%
13.0.4	365	4.11%
13.0.5	349	3.93%
11.0.3	347	3.91%
11.0.0	341	3.84%
18.5.0	330	3.72%
12.5.4	196	2.21%
12.5.6	196	2.21%
17.5.2	174	1.96%
16.0.4	174	1.96%
14.5.2	170	1.91%
17.5.3	154	1.73%
15.0.3	147	1.66%
18.0.1	132	1.49%
10.0.0	132	1.49%
10.1.2	131	1.47%
16.5.1	125	1.41%
17.5.1	104	1.17%
10.1.0	104	1.17%
17.0.2	101	1.14%
16.0.1	98	1.10%
13.0.2	94	1.06%
18.0.0	89	1.00%
Other	2,641	29.73%
Microsoft (6,141 servers)
Version	Number of Servers	Percent
6.0.3790.4675	3,206	52.21%
7.5.7601.17514	810	13.19%
8.5.9600.16384	693	11.28%
6.0.3790.3959	378	6.16%
10.0.14393.0	192	3.13%
8.0.9200.16384	166	2.70%
5.0.2195.5329	140	2.28%
7.0.6002.18264	107	1.74%
6.0.3790.1830	93	1.51%
5.0.2195.6713	70	1.14%
Other	286	4.66%
IMail (1,669 servers)
Version	Number of Servers	Percent
12.5.6.101	304	18.21%
8.22	172	10.31%
12.4.1.15	153	9.17%
12.5.5.115	125	7.49%
12.5.4.146	105	6.29%
9.23	101	6.05%
12.5.3.93	90	5.39%
12.3.0.100	84	5.03%
8.15	73	4.37%
11.03	51	3.06%
8.05	49	2.94%
12.5.5.117	27	1.62%
11.5	22	1.32%
10.02	21	1.26%
10.01	20	1.20%
7.07	19	1.14%
7.15	18	1.08%
Other	235	14.08%
CommuniGate Pro (1,416 servers)
Version	Number of Servers	Percent
6.1.16	75	5.30%
6.2.7	64	4.52%
6.1.18	54	3.81%
6.0.11	54	3.81%
5.4.11	53	3.74%
5.2.20	37	2.61%
5.1.16	37	2.61%
6.1.11	37	2.61%
5.3.13	37	2.61%
6.1.19	34	2.40%
6.2.1	30	2.12%
6.0.9	29	2.05%
6.2.6	29	2.05%
6.2.4	29	2.05%
6.1.10	28	1.98%
5.2.3	27	1.91%
6.2.5	24	1.69%
6.1.2	24	1.69%
6.2.0	23	1.62%
6.1.15	21	1.48%
4.1.8	21	1.48%
6.1.12	21	1.48%
6.2.8	20	1.41%
6.1.13	19	1.34%
6.2.3	18	1.27%
6.1.17	18	1.27%
6.1.8	18	1.27%
6.1.20	17	1.20%
6.1.14	17	1.20%
6.1.5	16	1.13%
6.0.10	15	1.06%
5.4.4	15	1.06%
Other	455	32.13%
XMail (908 servers)
Version	Number of Servers	Percent
1.27	431	47.47%
1.22	283	31.17%
1.25	60	6.61%
1.26	57	6.28%
1.24	34	3.74%
1.21	12	1.32%
Other	31	3.41%
Lotus Domino (635 servers)
Version	Number of Servers	Percent
8.5.3FP6	125	19.69%
8.5.3	96	15.12%
8.5.2	34	5.35%
7.0.2	27	4.25%
8.5.1	24	3.78%
8.5	22	3.46%
8.5.3FP2	18	2.83%
8.5.3FP3	14	2.20%
7.0.3	13	2.05%
8.5.3FP4	13	2.05%
8.5.3FP1	13	2.05%
8.5.2FP2	12	1.89%
7.0	11	1.73%
8.5.2FP4	11	1.73%
8.0	11	1.73%
8.5.1FP5	10	1.57%
8.5.2FP3	10	1.57%
6.5	9	1.42%
8.0.1	9	1.42%
7.0.1	9	1.42%
6.5.5	7	1.10%
6.5.4	7	1.10%
8.5.3FP5	7	1.10%
7.0.4	7	1.10%
Other	116	18.27%
WinWebMail (629 servers)
Version	Number of Servers	Percent
3.9.0.7	124	19.71%
3.8.1.3	82	13.04%
3.9.0.1	43	6.84%
4.2.0.1	41	6.52%
3.8.0.1	36	5.72%
3.7.6.1	28	4.45%
4.1.0.1	27	4.29%
3.8.1.5	27	4.29%
4.0.0.1	26	4.13%
3.8.6.1	18	2.86%
3.7.3.1	17	2.70%
3.8.1.1	17	2.70%
3.8.5.1	17	2.70%
3.9.3.1	16	2.54%
3.9.5.3	14	2.23%
3.7.7.3	12	1.91%
3.8.3.1	11	1.75%
3.9.2.1	11	1.75%
3.8.2.1	10	1.59%
3.7.1.1	8	1.27%
Other	44	7.00%
Qmail Toaster (622 servers)
Version	Number of Servers	Percent
1.3	477	76.69%
1.03	109	17.52%
1.03.5	11	1.77%
1.2	10	1.61%
1.03.6	9	1.45%
Other	6	0.96%
SurgeSMTP (573 servers)
Version	Number of Servers	Percent
7.3e2-2	123	21.47%
7.3i2-2	99	17.28%
7.1e-1	42	7.33%
6.5a2-2	30	5.24%
7.2i-1	27	4.71%
6.9c-1	23	4.01%
6.7c-1	21	3.66%
7.2a-1	20	3.49%
7.0c2-2	15	2.62%
3.9e-1	14	2.44%
7.3o2-2	12	2.09%
6.5a-1	12	2.09%
7.2e-2	12	2.09%
7.3c3-3	8	1.40%
6.4a-1	8	1.40%
6.1c-1	7	1.22%
7.3j-4	7	1.22%
5.2a-1	7	1.22%
4.0u4-4	7	1.22%
7.3n-1	6	1.05%
Other	73	12.74%
OpenSMTPD (349 servers)
Version	Number of Servers	Percent
Other	349	100.00%
Kerio (317 servers)
Version	Number of Servers	Percent
6.7.3	62	19.56%
6.7.0	44	13.88%
6.6.2	33	10.41%
6.5.2	32	10.09%
6.7.2	29	9.15%
6.6.1	16	5.05%
6.5.0	15	4.73%
6.4.1	14	4.42%
6.7.1	12	3.79%
6.3.1	10	3.15%
6.4.0	7	2.21%
6.3.0	6	1.89%
6.6.0	6	1.89%
6.5.1	6	1.89%
6.1.3	4	1.26%
5.7.9	4	1.26%
Other	17	5.36%
Merak (210 servers)
Version	Number of Servers	Percent
8.0.3	58	27.62%
8.9.1	43	20.48%
8.5.0	15	7.14%
7.6.1	11	5.24%
7.5.2	10	4.76%
8.3.8	10	4.76%
7.4.5	10	4.76%
7.6.4	7	3.33%
9.0.3	7	3.33%
7.4.2	4	1.90%
7.2.0	4	1.90%
7.6.0	3	1.43%
7.0.1	3	1.43%
6.0.8	3	1.43%
Other	22	10.48%
MagicMail (184 servers)
Version	Number of Servers	Percent
Other	184	100.00%
Post.Office (141 servers)
Version	Number of Servers	Percent
4.3	33	23.40%
4.2.2	24	17.02%
4.1.2.4	15	10.64%
3.5.3	12	8.51%
4.4	12	8.51%
4.2.1.3	8	5.67%
4.1.1	4	2.84%
3.9.2.3	3	2.13%
4.2.1.1	3	2.13%
3.5.1	3	2.13%
3.5.3J	3	2.13%
3.1.2	3	2.13%
3.9.2	2	1.42%
4.0.1	2	1.42%
3.8.7.4	2	1.42%
Other	12	8.51%
ArGoSoft (136 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	49	36.03%
1.8 (1.8.9.3)	18	13.24%
1.8 (1.8.9.5)	18	13.24%
1.8 (1.8.9.1)	12	8.82%
1.8 (1.8.8.8)	5	3.68%
1.8 (1.8.7.3)	4	2.94%
1.8 (1.8.8.7)	3	2.21%
1.8 (1.8.8.9)	3	2.21%
1.8 (1.8.7.6)	2	1.47%
1.8 (1.8.8.4)	2	1.47%
1.8 (1.8.5.8)	2	1.47%
1.8 (1.8.9.2)	2	1.47%
1.8 (1.8.6.0)	2	1.47%
1.8 (1.8.9.4)	2	1.47%
1.8 (1.8.2.1)	2	1.47%
Other	10	7.35%
GroupWise (86 servers)
Version	Number of Servers	Percent
14.2.2	14	16.28%
18.0.2	10	11.63%
14.2.3	8	9.30%
14.2.1	7	8.14%
14.2.0	6	6.98%
14.0.1	5	5.81%
6.5.7	4	4.65%
7.0.3	4	4.65%
18.0.1	4	4.65%
18.0.0	3	3.49%
8.0.3	3	3.49%
7.0.2	2	2.33%
6.0.2	2	2.33%
6.0.4	2	2.33%
7.0.4	1	1.16%
6.5.0	1	1.16%
6.0.3	1	1.16%
6.5.5	1	1.16%
12.0.1	1	1.16%
7.0.1	1	1.16%
8.0.0	1	1.16%
14.0.0	1	1.16%
6.5.6	1	1.16%
6.5.4	1	1.16%
8.0.1	1	1.16%
18.0.9	1	1.16%
Other	0	0.00%
Gordano Messaging Suite (GMS) (83 servers)
Version	Number of Servers	Percent
Other	83	100.00%
Trend Micro (55 servers)
Version	Number of Servers	Percent
5.7	17	30.91%
5.18	12	21.82%
5.5	8	14.55%
7.0	7	12.73%
7.5	5	9.09%
3.53	2	3.64%
8.5	1	1.82%
7.5ready	1	1.82%
8	1	1.82%
9.0	1	1.82%
Other	0	0.00%
InterScan VirusWall (19 servers)
Version	Number of Servers	Percent
Other	19	100.00%
OpenVMS (17 servers)
Version	Number of Servers	Percent
8.4	8	47.06%
7.3	6	35.29%
8.3	2	11.76%
8.2	1	5.88%
Other	0	0.00%
VisNetic (17 servers)
Version	Number of Servers	Percent
9.3.2.0	7	41.18%
5.5.8.3	2	11.76%
5.0.2.3	2	11.76%
8.0.3	1	5.88%
5.8.6.6	1	5.88%
9.1.4.0	1	5.88%
8.0.3.1	1	5.88%
6.2.2.0	1	5.88%
8.5.0.8	1	5.88%
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%
4.4.5-GA	1	9.09%
4.4.6-GA	1	9.09%
Other	0	0.00%
Mercury (7 servers)
Version	Number of Servers	Percent
1.48	4	57.14%
3.32	3	42.86%
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%
Neon Mail Server (5 servers)
Version	Number of Servers	Percent
3.1.3	1	20.00%
3.0.7	1	20.00%
3.1.2	1	20.00%
3.1.0	1	20.00%
3.0.8	1	20.00%
Other	0	0.00%
WebSTAR V (4 servers)
Version	Number of Servers	Percent
5.4.1	3	75.00%
5.3.2	1	25.00%
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	2	100.00%
Other	0	0.00%
WebSTAR (2 servers)
Version	Number of Servers	Percent
Other	2	100.00%