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	1,755,511	100.0%
Number of Servers that didn't respond	309,833	17.65%
Server didn't open socket	304,085	17.32%
Server didn't provide banner	5,748	0.33%
Server provided banner	1,445,678	82.35%
Server banner identifies software in use	897,937	51.15%

As indicated by the above table, of the 1,755,511 servers queried, only 897,937 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	512,004	57.02%
Postfix	309,024	34.41%
Sendmail	36,791	4.10%
MailEnable	19,454	2.17%
MDaemon	7,921	0.88%
Microsoft	5,208	0.58%
IMail	1,492	0.17%
CommuniGate Pro	1,296	0.14%
XMail	834	0.09%
Qmail Toaster	744	0.08%
WinWebMail	558	0.06%
Lotus Domino	547	0.06%
SurgeSMTP	534	0.06%
OpenSMTPD	370	0.04%
Kerio	272	0.03%
Merak	180	0.02%
MagicMail	177	0.02%
Post.Office	133	0.01%
ArGoSoft	117	0.01%
GroupWise	80	0.01%
Gordano Messaging Suite (GMS)	72	0.01%
Trend Micro	51	0.01%
InterScan VirusWall	20	0.00%
OpenVMS	15	0.00%
VisNetic	14	0.00%
Mirapoint	8	0.00%
Mercury	7	0.00%
Interscan	4	0.00%
WebSTAR V	3	0.00%
ModusMail	2	0.00%
WebSTAR	2	0.00%
MessageWall	2	0.00%
Neon Mail Server	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (512,004 servers)
Version	Number of Servers	Percent
4.91	407,742	79.64%
4.87	23,201	4.53%
4.89	19,536	3.82%
4.84	11,566	2.26%
4.92	10,336	2.02%
4.90	8,653	1.69%
Other	30,970	6.05%
Postfix (309,024 servers)
Version	Number of Servers	Percent
Other	309,024	100.00%
Sendmail (36,791 servers)
Version	Number of Servers	Percent
8.15.2	11,998	32.61%
8.14.4	7,277	19.78%
8.13.8	4,130	11.23%
8.14.7	3,111	8.46%
8.14.5	2,977	8.09%
8.13.1	2,607	7.09%
8.14.9	1,511	4.11%
8.14.3	797	2.17%
Other	2,383	6.48%
MailEnable (19,454 servers)
Version	Number of Servers	Percent
10.12--	4,053	20.83%
9.00--	1,537	7.90%
9.16--	1,463	7.52%
8.60--	522	2.68%
10.20--	514	2.64%
8.53--	427	2.19%
6.5--	380	1.95%
8.51--	316	1.62%
8.60-8.60-	305	1.57%
10.16--	247	1.27%
10.18--	244	1.25%
10.19--	243	1.25%
8.04--	242	1.24%
1.986--	225	1.16%
10.20--10.20	213	1.09%
9.75--	213	1.09%
9.00--9.00	206	1.06%
Other	8,104	41.66%
MDaemon (7,921 servers)
Version	Number of Servers	Percent
18.5.3	664	8.38%
13.5.1	485	6.12%
18.5.2	400	5.05%
13.6.3	398	5.02%
13.0.4	326	4.12%
13.0.5	312	3.94%
18.5.1	309	3.90%
11.0.3	305	3.85%
11.0.0	303	3.83%
16.5.2	267	3.37%
12.5.4	181	2.29%
12.5.6	173	2.18%
14.5.2	149	1.88%
18.0.2	143	1.81%
10.1.2	123	1.55%
16.0.4	118	1.49%
15.0.3	116	1.46%
10.0.0	111	1.40%
18.5.0	99	1.25%
10.1.0	96	1.21%
16.5.1	89	1.12%
17.5.2	84	1.06%
17.5.3	83	1.05%
13.0.2	80	1.01%
Other	2,507	31.65%
Microsoft (5,208 servers)
Version	Number of Servers	Percent
6.0.3790.4675	2,529	48.56%
7.5.7601.17514	674	12.94%
8.5.9600.16384	658	12.63%
6.0.3790.3959	303	5.82%
10.0.14393.2608	180	3.46%
8.0.9200.16384	152	2.92%
5.0.2195.5329	129	2.48%
6.0.3790.1830	86	1.65%
7.0.6002.18264	82	1.57%
5.0.2195.6713	67	1.29%
10.0.14393.0	59	1.13%
Other	289	5.55%
IMail (1,492 servers)
Version	Number of Servers	Percent
12.5.6.101	263	17.63%
12.4.1.15	142	9.52%
8.22	124	8.31%
12.5.5.115	93	6.23%
12.5.3.93	91	6.10%
9.23	86	5.76%
12.5.4.146	85	5.70%
12.3.0.100	76	5.09%
8.15	63	4.22%
11.03	45	3.02%
8.05	45	3.02%
12.5.7.58	40	2.68%
12.5.7.59	40	2.68%
12.5.5.117	21	1.41%
11.5	20	1.34%
10.02	20	1.34%
8.00	16	1.07%
7.07	16	1.07%
10.01	15	1.01%
Other	191	12.80%
CommuniGate Pro (1,296 servers)
Version	Number of Servers	Percent
6.2.12	89	6.87%
6.1.16	57	4.40%
6.2.10	50	3.86%
6.0.11	48	3.70%
5.4.11	43	3.32%
6.1.18	39	3.01%
5.2.20	37	2.85%
5.3.13	36	2.78%
5.1.16	33	2.55%
6.1.11	29	2.24%
6.2.11	29	2.24%
6.2.7	28	2.16%
6.1.20	27	2.08%
6.0.9	24	1.85%
6.1.10	23	1.77%
5.2.3	22	1.70%
6.2.1	20	1.54%
6.1.2	20	1.54%
6.2.9	19	1.47%
6.1.13	18	1.39%
6.1.19	18	1.39%
4.1.8	17	1.31%
6.1.5	16	1.23%
6.1.15	16	1.23%
6.1.12	16	1.23%
6.2.4	16	1.23%
6.2.8	15	1.16%
6.1.9	14	1.08%
4.2.10	14	1.08%
6.1.14	14	1.08%
6.1.17	14	1.08%
6.2.5	13	1.00%
Other	422	32.56%
XMail (834 servers)
Version	Number of Servers	Percent
1.27	398	47.72%
1.22	265	31.77%
1.26	53	6.35%
1.25	46	5.52%
1.24	32	3.84%
1.21	9	1.08%
Other	31	3.72%
Qmail Toaster (744 servers)
Version	Number of Servers	Percent
1.3	594	79.84%
1.03	122	16.40%
1.03.5	11	1.48%
1.03.6	9	1.21%
Other	8	1.08%
WinWebMail (558 servers)
Version	Number of Servers	Percent
3.9.0.7	97	17.38%
4.2.0.1	74	13.26%
3.8.1.3	62	11.11%
3.9.0.1	39	6.99%
3.8.0.1	34	6.09%
3.7.6.1	24	4.30%
3.8.1.5	23	4.12%
4.1.0.1	21	3.76%
4.0.0.1	20	3.58%
3.7.3.1	15	2.69%
3.8.5.1	15	2.69%
3.8.1.1	13	2.33%
3.9.2.1	13	2.33%
3.8.6.1	12	2.15%
3.9.3.1	11	1.97%
3.8.3.1	11	1.97%
3.7.7.3	11	1.97%
3.9.5.3	10	1.79%
3.8.2.1	10	1.79%
3.7.0.5	6	1.08%
Other	37	6.63%
Lotus Domino (547 servers)
Version	Number of Servers	Percent
8.5.3FP6	107	19.56%
8.5.3	81	14.81%
7.0.2	25	4.57%
8.5.2	25	4.57%
8.5.1	19	3.47%
8.5	18	3.29%
8.5.3FP1	15	2.74%
7.0	13	2.38%
8.5.3FP2	13	2.38%
8.5.3FP3	13	2.38%
7.0.3	12	2.19%
8.5.3FP4	11	2.01%
8.0.1	10	1.83%
8.5.1FP5	10	1.83%
8.5.2FP2	10	1.83%
8.0	10	1.83%
8.5.2FP4	9	1.65%
8.5.2FP3	9	1.65%
7.0.4	8	1.46%
6.5	7	1.28%
8.5.3FP5	7	1.28%
6.5.4	7	1.28%
8.5.2FP4HF759	6	1.10%
6.5.5	6	1.10%
7.0.1	6	1.10%
7.0.3FP1	6	1.10%
Other	84	15.36%
SurgeSMTP (534 servers)
Version	Number of Servers	Percent
7.3o4-4	116	21.72%
7.3e2-2	81	15.17%
7.3i2-2	43	8.05%
7.1e-1	35	6.55%
6.5a2-2	25	4.68%
6.7c-1	20	3.75%
6.9c-1	19	3.56%
7.2a-1	17	3.18%
7.2i-1	16	3.00%
7.0c2-2	14	2.62%
7.3o2-2	12	2.25%
3.9e-1	12	2.25%
6.5a-1	10	1.87%
7.2e-2	10	1.87%
5.2a-1	7	1.31%
4.0u4-4	7	1.31%
6.1c-1	6	1.12%
6.4a-1	6	1.12%
Other	78	14.61%
OpenSMTPD (370 servers)
Version	Number of Servers	Percent
Other	370	100.00%
Kerio (272 servers)
Version	Number of Servers	Percent
6.7.3	65	23.90%
6.7.0	37	13.60%
6.6.2	26	9.56%
6.5.2	25	9.19%
6.7.2	24	8.82%
6.4.1	12	4.41%
6.5.0	12	4.41%
6.6.1	11	4.04%
6.7.1	10	3.68%
6.4.0	8	2.94%
6.3.1	8	2.94%
6.6.0	6	2.21%
6.5.1	4	1.47%
6.1.3	3	1.10%
6.3.0	3	1.10%
5.7.9	3	1.10%
6.1.0	3	1.10%
Other	12	4.41%
Merak (180 servers)
Version	Number of Servers	Percent
8.0.3	45	25.00%
8.9.1	39	21.67%
8.5.0	12	6.67%
7.4.5	10	5.56%
7.6.1	10	5.56%
8.3.8	9	5.00%
7.5.2	7	3.89%
9.0.3	7	3.89%
7.6.4	5	2.78%
7.4.2	4	2.22%
7.2.0	4	2.22%
7.6.0	3	1.67%
7.0.1	3	1.67%
6.0.8	3	1.67%
4.4.1	2	1.11%
Other	17	9.44%
MagicMail (177 servers)
Version	Number of Servers	Percent
Other	177	100.00%
Post.Office (133 servers)
Version	Number of Servers	Percent
4.3	34	25.56%
4.2.2	24	18.05%
4.4	15	11.28%
4.1.2.4	14	10.53%
3.5.3	9	6.77%
4.2.1.3	6	4.51%
4.1.1	4	3.01%
4.2.1.1	3	2.26%
3.5.3J	3	2.26%
3.5.1	3	2.26%
3.9.2	2	1.50%
4.0.1	2	1.50%
3.8.7.4	2	1.50%
3.9.2.3	2	1.50%
Other	10	7.52%
ArGoSoft (117 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	42	35.90%
1.8 (1.8.9.3)	16	13.68%
1.8 (1.8.9.5)	15	12.82%
1.8 (1.8.9.1)	14	11.97%
1.8 (1.8.8.8)	4	3.42%
1.8 (1.8.7.3)	4	3.42%
1.8 (1.8.7.6)	2	1.71%
1.8 (1.8.8.9)	2	1.71%
1.8 (1.8.8.7)	2	1.71%
1.8 (1.8.5.8)	2	1.71%
1.8 (1.8.9.2)	2	1.71%
1.8 (1.8.6.0)	2	1.71%
1.8 (1.8.2.1)	2	1.71%
Other	8	6.84%
GroupWise (80 servers)
Version	Number of Servers	Percent
14.2.2	11	13.75%
18.1.0	11	13.75%
14.2.3	9	11.25%
18.0.2	8	10.00%
14.2.1	5	6.25%
14.0.1	4	5.00%
14.2.0	4	5.00%
6.5.7	3	3.75%
7.0.3	3	3.75%
18.0.0	2	2.50%
8.0.3	2	2.50%
18.0.1	2	2.50%
14.0.0	2	2.50%
7.0.2	2	2.50%
6.0.4	2	2.50%
7.0.4	1	1.25%
6.5.0	1	1.25%
6.5.5	1	1.25%
12.0.1	1	1.25%
7.0.1	1	1.25%
8.0.0	1	1.25%
6.5.6	1	1.25%
18.1.1	1	1.25%
6.5.4	1	1.25%
6.0.2	1	1.25%
Other	0	0.00%
Gordano Messaging Suite (GMS) (72 servers)
Version	Number of Servers	Percent
Other	72	100.00%
Trend Micro (51 servers)
Version	Number of Servers	Percent
5.7	14	27.45%
5.18	12	23.53%
5.5	8	15.69%
7.0	7	13.73%
7.5	5	9.80%
8.5	1	1.96%
7.5ready	1	1.96%
8	1	1.96%
9.0	1	1.96%
7.1	1	1.96%
Other	0	0.00%
InterScan VirusWall (20 servers)
Version	Number of Servers	Percent
Other	20	100.00%
OpenVMS (15 servers)
Version	Number of Servers	Percent
8.4	9	60.00%
7.3	3	20.00%
8.3	2	13.33%
8.2	1	6.67%
Other	0	0.00%
VisNetic (14 servers)
Version	Number of Servers	Percent
9.3.2.0	8	57.14%
5.5.8.3	2	14.29%
8.0.3	1	7.14%
5.0.2.3	1	7.14%
9.1.4.0	1	7.14%
6.2.2.0	1	7.14%
Other	0	0.00%
Mirapoint (8 servers)
Version	Number of Servers	Percent
4.4.2a-FCS	2	25.00%
4.4.3-GA	1	12.50%
4.3.6-GA	1	12.50%
3.10.10a-GA	1	12.50%
4.3.5-GA	1	12.50%
4.4.5-GA	1	12.50%
4.4.6-GA	1	12.50%
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 (4 servers)
Version	Number of Servers	Percent
3.81-Build_1022	2	50.00%
3.8-Build_3013	1	25.00%
3.8-Build_1080	1	25.00%
Other	0	0.00%
WebSTAR V (3 servers)
Version	Number of Servers	Percent
5.4.1	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%
MessageWall (2 servers)
Version	Number of Servers	Percent
1.0.8	2	100.00%
Other	0	0.00%
Neon Mail Server (1 servers)
Version	Number of Servers	Percent
3.0.8	1	100.00%
Other	0	0.00%