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	1,084,800	100.0%
Number of Servers that didn't respond	179,819	16.58%
Server didn't open socket	176,849	16.30%
Server didn't provide banner	2,970	0.27%
Server provided banner	904,981	83.42%
Server banner identifies software in use	581,204	53.58%

As indicated by the above table, of the 1,084,800 servers queried, only 581,204 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	344,026	59.19%
Postfix	195,375	33.62%
Sendmail	20,978	3.61%
MailEnable	11,807	2.03%
MDaemon	3,396	0.58%
Microsoft	1,812	0.31%
CommuniGate Pro	752	0.13%
IMail	606	0.10%
Qmail Toaster	483	0.08%
XMail	445	0.08%
SurgeSMTP	329	0.06%
OpenSMTPD	297	0.05%
Lotus Domino	205	0.04%
WinWebMail	169	0.03%
MagicMail	130	0.02%
Kerio	97	0.02%
Merak	82	0.01%
Post.Office	70	0.01%
ArGoSoft	49	0.01%
GroupWise	37	0.01%
Gordano Messaging Suite (GMS)	22	0.00%
Trend Micro	12	0.00%
OpenVMS	7	0.00%
VisNetic	6	0.00%
ModusMail	2	0.00%
Interscan	2	0.00%
InterScan VirusWall	2	0.00%
Mercury	1	0.00%
MessageWall	1	0.00%
WebSTAR V	1	0.00%
Neon Mail Server	1	0.00%
WebSTAR	1	0.00%
Mirapoint	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (344,026 servers)
Version	Number of Servers	Percent
4.94	158,821	46.17%
4.93	127,456	37.05%
4.91	13,201	3.84%
4.92	8,713	2.53%
4.92.3	6,075	1.77%
4.89	4,579	1.33%
4.93.0.4	3,728	1.08%
4.87	3,702	1.08%
4.84	3,474	1.01%
Other	14,277	4.15%
Postfix (195,375 servers)
Version	Number of Servers	Percent
Other	195,375	100.00%
Sendmail (20,978 servers)
Version	Number of Servers	Percent
8.15.2	10,431	49.72%
8.14.4	3,085	14.71%
8.14.7	2,200	10.49%
8.13.8	1,408	6.71%
8.14.5	1,245	5.93%
8.14.9	530	2.53%
8.16.1	457	2.18%
8.13.1	402	1.92%
8.14.3	263	1.25%
Other	957	4.56%
MailEnable (11,807 servers)
Version	Number of Servers	Percent
10.27--	3,623	30.69%
10.25--	1,928	16.33%
9.00--	382	3.24%
10.31--	376	3.18%
10.29--	224	1.90%
10.31-10.31-	224	1.90%
10.30--	180	1.52%
10.31--10.31	173	1.47%
9.16--	142	1.20%
9.00--9.00	127	1.08%
10.12--	121	1.02%
10.32--	119	1.01%
Other	4,188	35.47%
MDaemon (3,396 servers)
Version	Number of Servers	Percent
21.0.1	317	9.33%
13.5.1	240	7.07%
19.5.5	183	5.39%
13.0.5	139	4.09%
21.0.0	134	3.95%
20.0.4	131	3.86%
11.0.3	128	3.77%
13.0.4	123	3.62%
11.0.0	116	3.42%
20.0.3	95	2.80%
16.5.2	95	2.80%
19.5.4	86	2.53%
12.5.6	75	2.21%
14.5.2	71	2.09%
12.5.4	47	1.38%
13.6.3	44	1.30%
10.1.2	37	1.09%
16.0.4	37	1.09%
10.0.0	37	1.09%
Other	1,261	37.13%
Microsoft (1,812 servers)
Version	Number of Servers	Percent
6.0.3790.4675	672	37.09%
8.5.9600.16384	285	15.73%
7.5.7601.17514	188	10.38%
10.0.14393.4169	119	6.57%
6.0.3790.3959	96	5.30%
5.0.2195.5329	66	3.64%
10.0.17763.1697	65	3.59%
10.0.14393.2608	56	3.09%
8.0.9200.16384	43	2.37%
10.0.17763.1	36	1.99%
7.0.6002.18264	30	1.66%
6.0.3790.1830	24	1.32%
5.0.2195.6713	24	1.32%
5.0.2195.7381	21	1.16%
Other	87	4.80%
CommuniGate Pro (752 servers)
Version	Number of Servers	Percent
6.2.14	93	12.37%
6.2.15	82	10.90%
6.1.20	36	4.79%
6.2.12	25	3.32%
5.3.13	23	3.06%
6.1.16	22	2.93%
5.4.11	21	2.79%
6.0.11	19	2.53%
5.2.20	18	2.39%
6.1.18	16	2.13%
6.0.9	14	1.86%
6.3.3	13	1.73%
5.1.16	12	1.60%
6.3.5	10	1.33%
5.2.3	10	1.33%
6.3.6	10	1.33%
6.0.7	9	1.20%
6.1.9	9	1.20%
6.1.19	8	1.06%
6.2.7	8	1.06%
6.2.10	8	1.06%
Other	286	38.03%
IMail (606 servers)
Version	Number of Servers	Percent
12.5.8.41	101	16.67%
12.5.7.59	78	12.87%
12.5.6.101	57	9.41%
12.4.1.15	47	7.76%
9.23	31	5.12%
8.22	31	5.12%
12.5.3.93	26	4.29%
12.3.0.100	25	4.13%
8.05	24	3.96%
8.15	21	3.47%
12.5.5.115	20	3.30%
10.02	18	2.97%
12.5.6.105	16	2.64%
12.5.4.146	12	1.98%
12.5.5.117	9	1.49%
7.07	8	1.32%
11.5	8	1.32%
Other	74	12.21%
Qmail Toaster (483 servers)
Version	Number of Servers	Percent
1.3	368	76.19%
1.03	104	21.53%
1.03.5	7	1.45%
Other	4	0.83%
XMail (445 servers)
Version	Number of Servers	Percent
1.27	235	52.81%
1.22	141	31.69%
1.26	21	4.72%
1.25	21	4.72%
1.24	10	2.25%
1.15	5	1.12%
Other	12	2.70%
SurgeSMTP (329 servers)
Version	Number of Servers	Percent
7.3o4-4	49	14.89%
7.4o-1	37	11.25%
7.5a-1	37	11.25%
7.3e2-2	22	6.69%
7.5c-1	17	5.17%
7.1e-1	17	5.17%
7.4e-1	14	4.26%
7.3i2-2	11	3.34%
6.7c-1	9	2.74%
6.5a2-2	9	2.74%
7.2i-1	8	2.43%
7.4m-1	6	1.82%
7.5d-2	6	1.82%
7.5d-7	6	1.82%
7.5b-22	5	1.52%
3.9e-1	5	1.52%
7.2a-1	5	1.52%
6.9c-1	4	1.22%
Other	62	18.84%
OpenSMTPD (297 servers)
Version	Number of Servers	Percent
Other	297	100.00%
Lotus Domino (205 servers)
Version	Number of Servers	Percent
8.5.3FP6	39	19.02%
8.5.3	35	17.07%
8.5.1	15	7.32%
7.0	8	3.90%
8.5.2	8	3.90%
7.0.2	8	3.90%
8.5.2FP2	8	3.90%
7.0.3	6	2.93%
8.5.3FP5	5	2.44%
8.5.3FP1	4	1.95%
8.5	4	1.95%
8.5.3FP4	4	1.95%
8.5.3FP3	4	1.95%
8.5.1FP5	4	1.95%
8.5.2FP3	4	1.95%
8.5.2FP4HF759	3	1.46%
6.5.1	3	1.46%
Other	43	20.98%
WinWebMail (169 servers)
Version	Number of Servers	Percent
4.2.0.1	44	26.04%
3.9.0.7	28	16.57%
3.8.1.3	17	10.06%
4.3.0.1	12	7.10%
3.7.3.1	6	3.55%
3.8.0.1	6	3.55%
4.0.0.1	6	3.55%
3.8.6.1	5	2.96%
3.9.0.1	5	2.96%
3.8.1.1	5	2.96%
3.7.6.1	4	2.37%
4.1.0.1	3	1.78%
3.7.7.3	3	1.78%
1.0	3	1.78%
3.7.0.3	3	1.78%
3.8.1.5	3	1.78%
3.8.3.1	2	1.18%
3.8.5.1	2	1.18%
3.9.3.1	2	1.18%
3.7.5.1	2	1.18%
3.9.2.1	2	1.18%
Other	6	3.55%
MagicMail (130 servers)
Version	Number of Servers	Percent
Other	130	100.00%
Kerio (97 servers)
Version	Number of Servers	Percent
6.7.3	24	24.74%
6.7.0	14	14.43%
6.6.2	12	12.37%
6.6.1	9	9.28%
6.7.2	7	7.22%
6.5.0	6	6.19%
6.7.1	5	5.15%
6.5.2	4	4.12%
6.4.1	3	3.09%
6.3.0	2	2.06%
5.7.9	2	2.06%
5.7.6	2	2.06%
6.5.1	2	2.06%
6.3.1	1	1.03%
6.0.10	1	1.03%
6.0.8	1	1.03%
6.6.0	1	1.03%
6.1.0	1	1.03%
Other	0	0.00%
Merak (82 servers)
Version	Number of Servers	Percent
8.9.1	23	28.05%
8.0.3	23	28.05%
7.6.1	7	8.54%
8.3.8	4	4.88%
7.4.5	4	4.88%
9.0.3	3	3.66%
8.5.0	2	2.44%
7.6.0	2	2.44%
8.9.2	1	1.22%
8.3.6	1	1.22%
7.5.2	1	1.22%
6.1.0	1	1.22%
8.3.0	1	1.22%
4.2.1	1	1.22%
5.8.2	1	1.22%
8.9.7	1	1.22%
7.6.4	1	1.22%
7.4.4	1	1.22%
6.0.8	1	1.22%
7.0.1	1	1.22%
8.9.0	1	1.22%
6.0.3	1	1.22%
Other	0	0.00%
Post.Office (70 servers)
Version	Number of Servers	Percent
4.4	19	27.14%
4.3	17	24.29%
4.2.2	14	20.00%
3.5.3	7	10.00%
4.1.2.4	4	5.71%
4.1.1	2	2.86%
4.2.1.1	2	2.86%
3.9.2	1	1.43%
3.5.3J	1	1.43%
4.1	1	1.43%
3.1.2	1	1.43%
4.2	1	1.43%
Other	0	0.00%
ArGoSoft (49 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	14	28.57%
1.8 (1.8.9.3)	9	18.37%
1.8 (1.8.9.5)	5	10.20%
1.8 (1.8.7.3)	3	6.12%
1.8 (1.8.8.8)	2	4.08%
1.8 (1.8.8.9)	2	4.08%
1.8 (1.8.8.7)	2	4.08%
1.8 (1.8.9.2)	2	4.08%
1.8 (1.8.2.1)	2	4.08%
1.8 (1.8.9.1)	2	4.08%
1.8 (1.8.7.6)	1	2.04%
1.8 (1.8.5.8)	1	2.04%
1.8 (1.8.8.4)	1	2.04%
1.8 (1.8.6.0)	1	2.04%
1.8 (1.8.9.4)	1	2.04%
1.8 (1.8.2.5)	1	2.04%
Other	0	0.00%
GroupWise (37 servers)
Version	Number of Servers	Percent
18.1.1	8	21.62%
18.2.1	6	16.22%
18.2.0	4	10.81%
18.1.0	4	10.81%
14.2.1	3	8.11%
18.3.0	2	5.41%
6.5.7	1	2.70%
18.0.0	1	2.70%
14.2.3	1	2.70%
6.5.0	1	2.70%
8.0.3	1	2.70%
7.0.1	1	2.70%
14.2.0	1	2.70%
14.0.0	1	2.70%
18.0.2	1	2.70%
14.2.2	1	2.70%
Other	0	0.00%
Gordano Messaging Suite (GMS) (22 servers)
Version	Number of Servers	Percent
Other	22	100.00%
Trend Micro (12 servers)
Version	Number of Servers	Percent
5.18	4	33.33%
5.5	2	16.67%
7.5	2	16.67%
5.7	1	8.33%
7.5ready	1	8.33%
7.0	1	8.33%
7.1	1	8.33%
Other	0	0.00%
OpenVMS (7 servers)
Version	Number of Servers	Percent
8.4	5	71.43%
7.3	2	28.57%
Other	0	0.00%
VisNetic (6 servers)
Version	Number of Servers	Percent
9.3.2.0	3	50.00%
8.0.3	1	16.67%
6.2.2.0	1	16.67%
5.0.1	1	16.67%
Other	0	0.00%
ModusMail (2 servers)
Version	Number of Servers	Percent
4.1.361.21	2	100.00%
Other	0	0.00%
Interscan (2 servers)
Version	Number of Servers	Percent
3.8-Build_3013	1	50.00%
3.8-Build_1080	1	50.00%
Other	0	0.00%
InterScan VirusWall (2 servers)
Version	Number of Servers	Percent
Other	2	100.00%
Mercury (1 servers)
Version	Number of Servers	Percent
1.48	1	100.00%
Other	0	0.00%
MessageWall (1 servers)
Version	Number of Servers	Percent
1.0.8	1	100.00%
Other	0	0.00%
WebSTAR V (1 servers)
Version	Number of Servers	Percent
5.4.1	1	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%
WebSTAR (1 servers)
Version	Number of Servers	Percent
Other	1	100.00%
Mirapoint (1 servers)
Version	Number of Servers	Percent
4.4.5-GA	1	100.00%
Other	0	0.00%