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	1,022,454	100.0%
Number of Servers that didn't respond	210,630	20.60%
Server didn't open socket	208,136	20.36%
Server didn't provide banner	2,494	0.24%
Server provided banner	811,824	79.40%
Server banner identifies software in use	521,666	51.02%

As indicated by the above table, of the 1,022,454 servers queried, only 521,666 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	292,383	56.05%
Postfix	196,055	37.58%
Sendmail	17,813	3.41%
MailEnable	9,465	1.81%
MDaemon	2,024	0.39%
Microsoft	1,021	0.20%
CommuniGate Pro	633	0.12%
OpenSMTPD	498	0.10%
XMail	373	0.07%
SurgeSMTP	294	0.06%
IMail	290	0.06%
Qmail Toaster	178	0.03%
MagicMail	147	0.03%
WinWebMail	134	0.03%
Lotus Domino	105	0.02%
Post.Office	54	0.01%
Kerio	52	0.01%
Merak	51	0.01%
ArGoSoft	34	0.01%
GroupWise	26	0.00%
Gordano Messaging Suite (GMS)	12	0.00%
OpenVMS	6	0.00%
InterScan VirusWall	4	0.00%
VisNetic	3	0.00%
Trend Micro	3	0.00%
ModusMail	2	0.00%
MessageWall	2	0.00%
WebSTAR	1	0.00%
Mercury	1	0.00%
Mirapoint	1	0.00%
WebSTAR V	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (292,383 servers)
Version	Number of Servers	Percent
4.96.2	155,138	53.06%
4.98	80,934	27.68%
4.97.1	9,913	3.39%
4.96	9,526	3.26%
4.93	6,661	2.28%
4.94.2	5,416	1.85%
4.95	5,382	1.84%
Other	19,413	6.64%
Postfix (196,055 servers)
Version	Number of Servers	Percent
Other	196,055	100.00%
Sendmail (17,813 servers)
Version	Number of Servers	Percent
8.16.1	7,147	40.12%
8.15.2	4,152	23.31%
8.14.7	1,708	9.59%
8.14.4	1,382	7.76%
8.13.8	673	3.78%
8.18.1	609	3.42%
8.14.5	572	3.21%
8.14.9	238	1.34%
8.17.1	224	1.26%
8.17.1.9	185	1.04%
Other	923	5.18%
MailEnable (9,465 servers)
Version	Number of Servers	Percent
10.48--	3,573	37.75%
10.46--	1,111	11.74%
10.34--	318	3.36%
10.43--	231	2.44%
10.25--	211	2.23%
10.47--	208	2.20%
10.27--	184	1.94%
10.49--	175	1.85%
10.48--10.48	153	1.62%
10.43-10.43-	144	1.52%
10.49--10.49	126	1.33%
9.00--	116	1.23%
10.42--	113	1.19%
10.48-10.48-	113	1.19%
10.47--10.47	112	1.18%
10.47-10.47-	110	1.16%
10.49-10.49-	103	1.09%
9.00--9.00	95	1.00%
Other	2,269	23.97%
MDaemon (2,024 servers)
Version	Number of Servers	Percent
24.5.2	258	12.75%
24.5.1	98	4.84%
13.5.1	84	4.15%
19.5.4	80	3.95%
13.0.5	72	3.56%
11.0.0	69	3.41%
13.0.4	63	3.11%
11.0.3	61	3.01%
24.5.0	46	2.27%
16.5.2	46	2.27%
14.5.2	43	2.12%
23.0.2	36	1.78%
23.5.3	35	1.73%
24.0.1	35	1.73%
23.0.1	34	1.68%
12.5.6	33	1.63%
24.0.2	32	1.58%
21.5.4	30	1.48%
21.5.2	29	1.43%
19.5.5	27	1.33%
10.1.2	26	1.28%
22.0.3	22	1.09%
23.5.2	21	1.04%
Other	744	36.76%
Microsoft (1,021 servers)
Version	Number of Servers	Percent
6.0.3790.4675	250	24.49%
10.0.17763.1697	196	19.20%
10.0.14393.4169	127	12.44%
8.5.9600.16384	109	10.68%
7.5.7601.17514	69	6.76%
6.0.3790.3959	65	6.37%
5.0.2195.5329	49	4.80%
10.0.20348.1	34	3.33%
5.0.2195.6713	19	1.86%
8.0.9200.16384	16	1.57%
10.0.17763.1	14	1.37%
6.0.3790.1830	12	1.18%
Other	61	5.97%
CommuniGate Pro (633 servers)
Version	Number of Servers	Percent
6.2.15	54	8.53%
6.2.14	40	6.32%
6.4.1	31	4.90%
6.3.20	23	3.63%
6.1.20	21	3.32%
6.3.18	21	3.32%
6.3.17	19	3.00%
6.4.0	18	2.84%
6.0.11	13	2.05%
5.4.11	12	1.90%
6.0.9	12	1.90%
6.1.16	12	1.90%
5.2.20	12	1.90%
5.1.16	11	1.74%
6.3.19	10	1.58%
6.3.37	10	1.58%
6.3.14	9	1.42%
6.3.6	9	1.42%
6.2.12	8	1.26%
6.3.38	8	1.26%
6.1.18	8	1.26%
6.1.17	7	1.11%
6.1.19	7	1.11%
7.1.8	7	1.11%
7.1.6	7	1.11%
Other	244	38.55%
OpenSMTPD (498 servers)
Version	Number of Servers	Percent
Other	498	100.00%
XMail (373 servers)
Version	Number of Servers	Percent
1.27	239	64.08%
1.22	90	24.13%
1.26	14	3.75%
1.24	10	2.68%
1.25	10	2.68%
Other	10	2.68%
SurgeSMTP (294 servers)
Version	Number of Servers	Percent
7.8g-1	37	12.59%
7.8a-1	36	12.24%
7.3o4-4	23	7.82%
7.7c-1	17	5.78%
7.8c2-2	17	5.78%
7.6j-1	15	5.10%
7.8k-1	14	4.76%
7.5c-1	13	4.42%
7.3e2-2	10	3.40%
7.1e-1	10	3.40%
7.7i-1	9	3.06%
7.4o-1	8	2.72%
6.9c-1	8	2.72%
7.5a-1	7	2.38%
6.5a2-2	6	2.04%
7.2i-1	5	1.70%
7.4e-1	5	1.70%
7.6h-2	4	1.36%
7.6u-1	4	1.36%
7.4m-1	3	1.02%
7.8h-10	3	1.02%
7.6s-1	3	1.02%
6.5a-1	3	1.02%
Other	34	11.56%
IMail (290 servers)
Version	Number of Servers	Percent
12.6.1.4	59	20.34%
9.23	22	7.59%
12.5.8.59	19	6.55%
12.5.6.101	17	5.86%
12.5.8.41	17	5.86%
12.5.7.59	13	4.48%
12.5.3.93	13	4.48%
8.22	12	4.14%
8.05	12	4.14%
12.5.6.105	11	3.79%
12.5.8.58	9	3.10%
12.5.5.115	7	2.41%
7.07	6	2.07%
12.3.0.100	6	2.07%
12.5.4.146	5	1.72%
11.5	5	1.72%
12.5.8.54	4	1.38%
8.00	4	1.38%
12.4.1.15	4	1.38%
10.02	4	1.38%
12.5.5.117	4	1.38%
6.04	3	1.03%
12.6.0.17	3	1.03%
12.5.2.62	3	1.03%
11.03	3	1.03%
Other	25	8.62%
Qmail Toaster (178 servers)
Version	Number of Servers	Percent
1.03	115	64.61%
1.3	57	32.02%
1.03.5	4	2.25%
1.03.6	2	1.12%
Other	0	0.00%
MagicMail (147 servers)
Version	Number of Servers	Percent
Other	147	100.00%
WinWebMail (134 servers)
Version	Number of Servers	Percent
4.5.0.1	25	18.66%
3.8.1.3	17	12.69%
4.4.0.1	17	12.69%
4.2.0.1	15	11.19%
3.9.0.7	11	8.21%
4.0.0.1	6	4.48%
3.8.0.1	5	3.73%
4.3.0.1	5	3.73%
3.9.0.1	4	2.99%
3.7.3.1	4	2.99%
3.7.1.1	3	2.24%
4.1.0.1	3	2.24%
3.9.3.1	2	1.49%
3.7.7.3	2	1.49%
3.9.5.3	2	1.49%
3.8.6.1	2	1.49%
3.8.1.1	2	1.49%
Other	9	6.72%
Lotus Domino (105 servers)
Version	Number of Servers	Percent
8.5.3	19	18.10%
8.5.3FP6	18	17.14%
8.5.2	7	6.67%
8.5.1	5	4.76%
7.0	4	3.81%
8.5.2FP1	4	3.81%
6.5	4	3.81%
8.5.3FP3	4	3.81%
7.0.3FP1	3	2.86%
6.5.1	3	2.86%
8.5	3	2.86%
7.0.2	3	2.86%
6.5.3	3	2.86%
8.0	3	2.86%
6.5.2	2	1.90%
7.0.4FP2	2	1.90%
7.5.1	2	1.90%
Other	16	15.24%
Post.Office (54 servers)
Version	Number of Servers	Percent
4.4	22	40.74%
4.2.2	9	16.67%
4.3	5	9.26%
3.5.3	5	9.26%
4.1.2.4	4	7.41%
3.5.1	3	5.56%
4.2.1.3	2	3.70%
4.2	1	1.85%
3.9.2	1	1.85%
3.1.2	1	1.85%
4.2.1.1	1	1.85%
Other	0	0.00%
Kerio (52 servers)
Version	Number of Servers	Percent
6.7.3	11	21.15%
6.6.1	8	15.38%
6.7.0	6	11.54%
6.7.1	5	9.62%
6.6.2	4	7.69%
6.7.2	4	7.69%
6.5.2	4	7.69%
5.7.9	2	3.85%
6.5.1	2	3.85%
6.4.1	1	1.92%
5.7.6	1	1.92%
6.0.8	1	1.92%
6.6.0	1	1.92%
6.3.0	1	1.92%
6.5.0	1	1.92%
Other	0	0.00%
Merak (51 servers)
Version	Number of Servers	Percent
8.0.3	14	27.45%
8.9.1	13	25.49%
7.6.1	8	15.69%
8.3.8	3	5.88%
7.4.5	2	3.92%
7.6.4	2	3.92%
6.0.8	2	3.92%
8.0.1	1	1.96%
8.9.2	1	1.96%
6.1.0	1	1.96%
7.5.2	1	1.96%
7.6.0	1	1.96%
7.4.4	1	1.96%
5.8.2	1	1.96%
Other	0	0.00%
ArGoSoft (34 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	11	32.35%
1.8 (1.8.9.3)	4	11.76%
1.8 (1.8.9.5)	4	11.76%
1.8 (1.8.8.8)	2	5.88%
1.8 (1.8.7.3)	2	5.88%
1.8 (1.8.9.1)	2	5.88%
1.8 (1.8.8.7)	2	5.88%
1.8 (1.8.9.2)	2	5.88%
1.8 (1.8.7.6)	1	2.94%
1.8 (1.8.3.5)	1	2.94%
1.8 (1.8.9.4)	1	2.94%
1.8 (1.8.5.9)	1	2.94%
1.8 (1.8.8.9)	1	2.94%
Other	0	0.00%
GroupWise (26 servers)
Version	Number of Servers	Percent
18.3.1	5	19.23%
18.2.1	3	11.54%
24.3.0	3	11.54%
24.2.0	3	11.54%
18.5.0	2	7.69%
18.2.0	2	7.69%
14.2.1	1	3.85%
24.1.0	1	3.85%
14.2.3	1	3.85%
18.4.1	1	3.85%
24.4.0	1	3.85%
18.1.1	1	3.85%
18.0.2	1	3.85%
14.0.0	1	3.85%
Other	0	0.00%
Gordano Messaging Suite (GMS) (12 servers)
Version	Number of Servers	Percent
Other	12	100.00%
OpenVMS (6 servers)
Version	Number of Servers	Percent
8.4	3	50.00%
7.3	3	50.00%
Other	0	0.00%
InterScan VirusWall (4 servers)
Version	Number of Servers	Percent
Other	4	100.00%
VisNetic (3 servers)
Version	Number of Servers	Percent
9.3.2.0	2	66.67%
8.0.3	1	33.33%
Other	0	0.00%
Trend Micro (3 servers)
Version	Number of Servers	Percent
5.18	2	66.67%
5.5	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%
MessageWall (2 servers)
Version	Number of Servers	Percent
1.0.8	2	100.00%
Other	0	0.00%
WebSTAR (1 servers)
Version	Number of Servers	Percent
Other	1	100.00%
Mercury (1 servers)
Version	Number of Servers	Percent
4.x	1	100.00%
Other	0	0.00%
Mirapoint (1 servers)
Version	Number of Servers	Percent
4.4.5-GA	1	100.00%
Other	0	0.00%
WebSTAR V (1 servers)
Version	Number of Servers	Percent
5.3.2	1	100.00%
Other	0	0.00%