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	1,831,505	100.0%
Number of Servers that didn't respond	323,971	17.69%
Server didn't open socket	317,840	17.35%
Server didn't provide banner	6,131	0.33%
Server provided banner	1,507,534	82.31%
Server banner identifies software in use	933,014	50.94%

As indicated by the above table, of the 1,831,505 servers queried, only 933,014 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	529,521	56.75%
Postfix	319,976	34.29%
Sendmail	39,718	4.26%
MailEnable	20,521	2.20%
MDaemon	8,892	0.95%
Microsoft	6,245	0.67%
IMail	1,691	0.18%
CommuniGate Pro	1,429	0.15%
XMail	893	0.10%
Lotus Domino	654	0.07%
Qmail Toaster	636	0.07%
WinWebMail	624	0.07%
SurgeSMTP	573	0.06%
OpenSMTPD	323	0.03%
Kerio	320	0.03%
Merak	211	0.02%
MagicMail	184	0.02%
Post.Office	141	0.02%
ArGoSoft	141	0.02%
GroupWise	87	0.01%
Gordano Messaging Suite (GMS)	87	0.01%
Trend Micro	55	0.01%
InterScan VirusWall	22	0.00%
OpenVMS	17	0.00%
VisNetic	17	0.00%
Mirapoint	11	0.00%
Interscan	6	0.00%
Mercury	6	0.00%
WebSTAR V	4	0.00%
Neon Mail Server	3	0.00%
ModusMail	2	0.00%
WebSTAR	2	0.00%
MessageWall	2	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (529,521 servers)
Version	Number of Servers	Percent
4.91	395,405	74.67%
4.89	34,763	6.56%
4.87	32,384	6.12%
4.90	14,678	2.77%
4.84	13,632	2.57%
4.80	5,715	1.08%
4.86	5,304	1.00%
Other	27,640	5.22%
Postfix (319,976 servers)
Version	Number of Servers	Percent
Other	319,976	100.00%
Sendmail (39,718 servers)
Version	Number of Servers	Percent
8.15.2	11,578	29.15%
8.14.4	8,320	20.95%
8.13.8	5,264	13.25%
8.13.1	3,305	8.32%
8.14.5	3,279	8.26%
8.14.7	2,599	6.54%
8.14.9	1,644	4.14%
8.14.3	978	2.46%
Other	2,751	6.93%
MailEnable (20,521 servers)
Version	Number of Servers	Percent
9.00--	2,186	10.65%
10.12--	2,149	10.47%
9.16--	1,917	9.34%
8.53--	679	3.31%
8.60--	674	3.28%
6.5--	509	2.48%
8.51--	473	2.30%
10.16--	357	1.74%
8.60-8.60-	336	1.64%
8.04--	326	1.59%
1.986--	307	1.50%
9.75--	281	1.37%
10.18--	249	1.21%
10.15--	230	1.12%
10.14--	225	1.10%
9.00--9.00	216	1.05%
Other	9,407	45.84%
MDaemon (8,892 servers)
Version	Number of Servers	Percent
18.0.2	1,132	12.73%
13.5.1	512	5.76%
13.6.3	427	4.80%
16.5.2	370	4.16%
13.0.4	359	4.04%
11.0.3	356	4.00%
13.0.5	351	3.95%
11.0.0	334	3.76%
12.5.4	193	2.17%
12.5.6	193	2.17%
17.5.2	184	2.07%
16.0.4	184	2.07%
17.5.3	172	1.93%
14.5.2	167	1.88%
15.0.3	152	1.71%
18.0.1	149	1.68%
10.0.0	134	1.51%
10.1.2	131	1.47%
16.5.1	130	1.46%
10.1.0	111	1.25%
17.5.1	108	1.21%
17.0.2	104	1.17%
16.0.1	104	1.17%
13.0.2	99	1.11%
18.0.0	95	1.07%
Other	2,641	29.70%
Microsoft (6,245 servers)
Version	Number of Servers	Percent
6.0.3790.4675	3,267	52.31%
7.5.7601.17514	830	13.29%
8.5.9600.16384	706	11.31%
6.0.3790.3959	376	6.02%
10.0.14393.0	181	2.90%
8.0.9200.16384	166	2.66%
5.0.2195.5329	145	2.32%
7.0.6002.18264	107	1.71%
6.0.3790.1830	94	1.51%
5.0.2195.6713	70	1.12%
Other	303	4.85%
IMail (1,691 servers)
Version	Number of Servers	Percent
12.5.6.101	302	17.86%
8.22	168	9.93%
12.4.1.15	153	9.05%
12.5.5.115	124	7.33%
12.5.4.146	108	6.39%
9.23	102	6.03%
12.5.3.93	93	5.50%
12.3.0.100	86	5.09%
8.15	74	4.38%
11.03	50	2.96%
8.05	50	2.96%
11.5	27	1.60%
12.5.5.117	27	1.60%
7.07	26	1.54%
10.02	20	1.18%
10.01	20	1.18%
7.15	19	1.12%
Other	242	14.31%
CommuniGate Pro (1,429 servers)
Version	Number of Servers	Percent
6.1.16	80	5.60%
6.0.11	56	3.92%
6.1.18	55	3.85%
6.2.7	55	3.85%
5.4.11	54	3.78%
5.2.20	40	2.80%
6.1.11	39	2.73%
5.1.16	37	2.59%
6.1.19	35	2.45%
5.3.13	35	2.45%
6.2.6	30	2.10%
6.2.4	30	2.10%
6.2.5	29	2.03%
6.2.1	28	1.96%
6.1.10	28	1.96%
6.0.9	28	1.96%
5.2.3	27	1.89%
6.1.2	26	1.82%
6.2.0	23	1.61%
6.1.13	22	1.54%
6.1.15	21	1.47%
6.1.12	21	1.47%
4.1.8	20	1.40%
6.2.3	18	1.26%
6.1.20	18	1.26%
6.1.17	18	1.26%
6.1.5	17	1.19%
6.1.8	17	1.19%
6.1.14	17	1.19%
6.0.10	16	1.12%
5.4.4	16	1.12%
5.3.15	15	1.05%
6.1.9	15	1.05%
6.2	15	1.05%
6.2.2	15	1.05%
Other	413	28.90%
XMail (893 servers)
Version	Number of Servers	Percent
1.27	420	47.03%
1.22	278	31.13%
1.25	58	6.49%
1.26	58	6.49%
1.24	35	3.92%
1.21	14	1.57%
Other	30	3.36%
Lotus Domino (654 servers)
Version	Number of Servers	Percent
8.5.3FP6	128	19.57%
8.5.3	96	14.68%
8.5.2	32	4.89%
7.0.2	27	4.13%
8.5	24	3.67%
8.5.1	24	3.67%
8.5.3FP2	18	2.75%
8.5.3FP3	17	2.60%
7.0.3	14	2.14%
8.5.3FP4	14	2.14%
8.5.3FP1	14	2.14%
8.5.2FP2	13	1.99%
7.0	12	1.83%
8.5.2FP4	12	1.83%
8.5.2FP3	12	1.83%
8.0	11	1.68%
8.0.1	10	1.53%
7.0.1	10	1.53%
8.5.1FP5	10	1.53%
6.5	9	1.38%
6.5.5	8	1.22%
6.5.4	8	1.22%
8.5.3FP5	7	1.07%
7.0.4	7	1.07%
Other	117	17.89%
Qmail Toaster (636 servers)
Version	Number of Servers	Percent
1.3	486	76.42%
1.03	114	17.92%
1.03.5	11	1.73%
1.03.6	10	1.57%
1.2	10	1.57%
Other	5	0.79%
WinWebMail (624 servers)
Version	Number of Servers	Percent
3.9.0.7	128	20.51%
3.8.1.3	85	13.62%
3.9.0.1	44	7.05%
4.2.0.1	40	6.41%
3.8.0.1	37	5.93%
3.7.6.1	30	4.81%
4.0.0.1	28	4.49%
4.1.0.1	24	3.85%
3.8.1.5	24	3.85%
3.8.5.1	19	3.04%
3.8.6.1	17	2.72%
3.7.3.1	17	2.72%
3.9.3.1	16	2.56%
3.9.5.3	16	2.56%
3.7.7.3	13	2.08%
3.8.1.1	13	2.08%
3.9.2.1	11	1.76%
3.8.2.1	8	1.28%
3.7.1.1	7	1.12%
3.9.5.1	7	1.12%
Other	40	6.41%
SurgeSMTP (573 servers)
Version	Number of Servers	Percent
7.3e2-2	134	23.39%
7.3i2-2	89	15.53%
7.1e-1	42	7.33%
6.5a2-2	29	5.06%
7.2i-1	27	4.71%
6.7c-1	23	4.01%
6.9c-1	23	4.01%
7.2a-1	21	3.66%
7.0c2-2	14	2.44%
6.5a-1	13	2.27%
7.2e-2	13	2.27%
3.9e-1	13	2.27%
7.3o2-2	11	1.92%
7.3c3-3	8	1.40%
6.1c-1	7	1.22%
5.2a-1	7	1.22%
6.4a-1	7	1.22%
4.0u4-4	7	1.22%
7.3j-4	6	1.05%
7.3n-1	6	1.05%
Other	73	12.74%
OpenSMTPD (323 servers)
Version	Number of Servers	Percent
Other	323	100.00%
Kerio (320 servers)
Version	Number of Servers	Percent
6.7.3	65	20.31%
6.7.0	48	15.00%
6.5.2	32	10.00%
6.6.2	30	9.38%
6.7.2	26	8.12%
6.4.1	15	4.69%
6.5.0	15	4.69%
6.6.1	14	4.38%
6.7.1	12	3.75%
6.3.1	9	2.81%
6.4.0	8	2.50%
6.3.0	6	1.88%
6.6.0	6	1.88%
6.5.1	6	1.88%
6.1.3	4	1.25%
5.7.9	4	1.25%
Other	20	6.25%
Merak (211 servers)
Version	Number of Servers	Percent
8.0.3	61	28.91%
8.9.1	42	19.91%
8.5.0	15	7.11%
7.6.1	11	5.21%
8.3.8	10	4.74%
7.4.5	10	4.74%
7.5.2	9	4.27%
7.6.4	7	3.32%
9.0.3	6	2.84%
7.4.2	4	1.90%
7.2.0	4	1.90%
7.6.0	3	1.42%
7.0.1	3	1.42%
6.0.8	3	1.42%
Other	23	10.90%
MagicMail (184 servers)
Version	Number of Servers	Percent
Other	184	100.00%
Post.Office (141 servers)
Version	Number of Servers	Percent
4.3	32	22.70%
4.2.2	24	17.02%
4.1.2.4	15	10.64%
3.5.3	12	8.51%
4.4	11	7.80%
4.2.1.3	10	7.09%
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 (141 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	52	36.88%
1.8 (1.8.9.3)	20	14.18%
1.8 (1.8.9.5)	18	12.77%
1.8 (1.8.9.1)	14	9.93%
1.8 (1.8.8.8)	5	3.55%
1.8 (1.8.7.3)	3	2.13%
1.8 (1.8.8.7)	3	2.13%
1.8 (1.8.8.9)	3	2.13%
1.8 (1.8.7.6)	2	1.42%
1.8 (1.8.9.4)	2	1.42%
1.8 (1.8.8.4)	2	1.42%
1.8 (1.8.5.8)	2	1.42%
1.8 (1.8.9.2)	2	1.42%
1.8 (1.8.6.0)	2	1.42%
1.8 (1.8.2.1)	2	1.42%
Other	9	6.38%
GroupWise (87 servers)
Version	Number of Servers	Percent
14.2.2	13	14.94%
14.2.3	9	10.34%
18.0.2	9	10.34%
14.2.1	7	8.05%
14.2.0	5	5.75%
14.0.1	5	5.75%
6.5.7	4	4.60%
7.0.3	4	4.60%
18.0.0	4	4.60%
18.0.1	4	4.60%
7.0.2	3	3.45%
8.0.3	3	3.45%
7.0.4	2	2.30%
6.0.2	2	2.30%
6.0.4	2	2.30%
6.5.0	1	1.15%
6.0.3	1	1.15%
6.5.5	1	1.15%
12.0.1	1	1.15%
7.0.1	1	1.15%
8.0.0	1	1.15%
6.5.6	1	1.15%
6.5.4	1	1.15%
8.0.1	1	1.15%
6.5.2	1	1.15%
18.0.9	1	1.15%
Other	0	0.00%
Gordano Messaging Suite (GMS) (87 servers)
Version	Number of Servers	Percent
Other	87	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 (22 servers)
Version	Number of Servers	Percent
Other	22	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%
5.8.6.6	2	11.76%
8.0.3	1	5.88%
5.0.2.3	1	5.88%
9.1.4.0	1	5.88%
8.0.3.1	1	5.88%
5.0.2.0	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%
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%
Mercury (6 servers)
Version	Number of Servers	Percent
3.32	3	50.00%
1.48	3	50.00%
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%
Neon Mail Server (3 servers)
Version	Number of Servers	Percent
3.1.3	1	33.33%
3.0.7	1	33.33%
3.0.8	1	33.33%
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%
MessageWall (2 servers)
Version	Number of Servers	Percent
1.0.8	2	100.00%
Other	0	0.00%