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	2,020,506	100.0%
Number of Servers that didn't respond	359,980	17.82%
Server didn't open socket	352,183	17.43%
Server didn't provide banner	7,797	0.39%
Server provided banner	1,660,526	82.18%
Server banner identifies software in use	1,007,754	49.88%

As indicated by the above table, of the 2,020,506 servers queried, only 1,007,754 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	559,609	55.53%
Postfix	333,494	33.09%
Sendmail	53,660	5.32%
MailEnable	23,815	2.36%
MDaemon	13,510	1.34%
Microsoft	12,223	1.21%
IMail	2,290	0.23%
CommuniGate Pro	1,898	0.19%
Lotus Domino	1,193	0.12%
WinWebMail	1,189	0.12%
XMail	1,106	0.11%
Qmail Toaster	876	0.09%
SurgeSMTP	690	0.07%
Kerio	496	0.05%
Merak	311	0.03%
OpenSMTPD	294	0.03%
MagicMail	262	0.03%
ArGoSoft	219	0.02%
Post.Office	164	0.02%
Gordano Messaging Suite (GMS)	121	0.01%
GroupWise	113	0.01%
Trend Micro	74	0.01%
InterScan VirusWall	32	0.00%
VisNetic	31	0.00%
Mirapoint	27	0.00%
OpenVMS	14	0.00%
ModusMail	9	0.00%
Mercury	7	0.00%
WebSTAR V	7	0.00%
Interscan	6	0.00%
MessageWall	6	0.00%
Neon Mail Server	4	0.00%
WebSTAR	2	0.00%
MAILsweeper	1	0.00%
NetIQ MailMarshal	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (559,609 servers)
Version	Number of Servers	Percent
4.87	407,594	72.84%
4.86	61,435	10.98%
4.84	20,002	3.57%
4.80	12,313	2.20%
4.85	9,799	1.75%
4.72	9,705	1.73%
4.76	8,415	1.50%
4.82	7,916	1.41%
4.80.1	6,494	1.16%
Other	15,936	2.85%
Postfix (333,494 servers)
Version	Number of Servers	Percent
Other	333,494	100.00%
Sendmail (53,660 servers)
Version	Number of Servers	Percent
8.14.5	12,828	23.91%
8.14.4	11,761	21.92%
8.13.8	9,614	17.92%
8.13.1	5,882	10.96%
8.14.3	2,712	5.05%
8.15.2	2,033	3.79%
8.14.9	1,548	2.88%
8.14.7	1,463	2.73%
8.12.11.20060308	886	1.65%
8.14.2	556	1.04%
Other	4,377	8.16%
MailEnable (23,815 servers)
Version	Number of Servers	Percent
9.00--	2,929	12.30%
8.60--	1,575	6.61%
8.53--	1,193	5.01%
6.5--	1,090	4.58%
1.986--	905	3.80%
8.51--	826	3.47%
8.04--	611	2.57%
5.10--	483	2.03%
8.60-8.60-	477	2.00%
8.50--	460	1.93%
8.00--	388	1.63%
6.0--	339	1.42%
4.26--	331	1.39%
7.06--	326	1.37%
9.50--	299	1.26%
9.12--	296	1.24%
Other	11,287	47.39%
MDaemon (13,510 servers)
Version	Number of Servers	Percent
16.5.1	1,306	9.67%
16.5.2	1,070	7.92%
16.0.4	1,028	7.61%
13.5.1	597	4.42%
11.0.3	547	4.05%
11.0.0	532	3.94%
13.0.4	521	3.86%
13.0.5	498	3.69%
16.5.0	394	2.92%
15.0.3	350	2.59%
13.6.3	333	2.46%
12.5.6	287	2.12%
15.5.3	277	2.05%
12.5.4	241	1.78%
10.0.0	235	1.74%
16.0.1	234	1.73%
14.5.2	225	1.67%
16.0.2	218	1.61%
10.1.2	215	1.59%
15.5.2	162	1.20%
10.1.0	142	1.05%
10.1.1	140	1.04%
Other	3,958	29.30%
Microsoft (12,223 servers)
Version	Number of Servers	Percent
6.0.3790.4675	7,798	63.80%
7.5.7601.17514	1,280	10.47%
6.0.3790.3959	921	7.53%
8.5.9600.16384	698	5.71%
6.0.3790.1830	261	2.14%
7.0.6002.18264	238	1.95%
8.0.9200.16384	212	1.73%
5.0.2195.5329	177	1.45%
5.0.2195.7381	142	1.16%
Other	496	4.06%
IMail (2,290 servers)
Version	Number of Servers	Percent
12.5.5.115	308	13.45%
12.5.4.146	199	8.69%
12.4.1.15	196	8.56%
8.22	191	8.34%
12.5.3.93	166	7.25%
9.23	157	6.86%
8.15	120	5.24%
12.3.0.100	115	5.02%
8.05	87	3.80%
11.03	69	3.01%
11.5	58	2.53%
7.07	37	1.62%
10.02	36	1.57%
7.15	34	1.48%
11.02	34	1.48%
12.5.1.60	33	1.44%
12.5.3.99	31	1.35%
12.1.0.270	30	1.31%
12.2.0.235	28	1.22%
12.5.2.62	24	1.05%
8.00	24	1.05%
12.4.1.9	23	1.00%
Other	290	12.66%
CommuniGate Pro (1,898 servers)
Version	Number of Servers	Percent
5.1.16	177	9.33%
6.1.11	129	6.80%
6.1.12	102	5.37%
6.1.13	82	4.32%
6.1.10	81	4.27%
5.4.11	75	3.95%
5.2.20	72	3.79%
6.0.11	71	3.74%
6.1.2	52	2.74%
6.0.9	48	2.53%
5.3.13	43	2.27%
6.1.8	41	2.16%
6.1.5	38	2.00%
5.2.3	36	1.90%
5.3.15	35	1.84%
5.0.14	35	1.84%
6.1.7	31	1.63%
4.1.8	30	1.58%
6.0.10	30	1.58%
6.1.9	23	1.21%
6.1.4	22	1.16%
5.2.16	21	1.11%
5.1.12	21	1.11%
5.4.5	20	1.05%
Other	583	30.72%
Lotus Domino (1,193 servers)
Version	Number of Servers	Percent
8.5.3FP6	211	17.69%
8.5.3	169	14.17%
8.5.2	54	4.53%
8.5.1	47	3.94%
7.0.2	41	3.44%
8.5	40	3.35%
8.5.3FP4	36	3.02%
8.5.2FP3	34	2.85%
8.5.3FP2	33	2.77%
8.5.2FP4	31	2.60%
8.5.3FP3	29	2.43%
8.5.3FP5	28	2.35%
8.5.3FP1	26	2.18%
8.0.1	25	2.10%
7.0.3	21	1.76%
7.0.1	21	1.76%
8.5.2FP2	19	1.59%
8.0	19	1.59%
8.5.1FP5	18	1.51%
7.0	16	1.34%
7.0.4	15	1.26%
6.5.1	14	1.17%
6.5.4	12	1.01%
8.5.2FP1	12	1.01%
Other	222	18.61%
WinWebMail (1,189 servers)
Version	Number of Servers	Percent
3.9.0.7	318	26.75%
3.8.1.3	184	15.48%
3.7.6.1	86	7.23%
3.8.0.1	84	7.06%
3.9.0.1	80	6.73%
3.8.1.5	59	4.96%
3.8.1.1	52	4.37%
3.8.5.1	48	4.04%
3.7.3.1	46	3.87%
3.8.6.1	40	3.36%
3.7.7.3	36	3.03%
3.8.2.1	29	2.44%
3.8.3.1	23	1.93%
3.7.1.1	23	1.93%
3.8.3.3	13	1.09%
Other	68	5.72%
XMail (1,106 servers)
Version	Number of Servers	Percent
1.27	461	41.68%
1.22	334	30.20%
1.25	98	8.86%
1.26	80	7.23%
1.24	52	4.70%
1.21	25	2.26%
1.23	14	1.27%
Other	42	3.80%
Qmail Toaster (876 servers)
Version	Number of Servers	Percent
1.3	796	90.87%
1.03	32	3.65%
1.2	14	1.60%
1.03.5	12	1.37%
Other	22	2.51%
SurgeSMTP (690 servers)
Version	Number of Servers	Percent
7.1e-1	184	26.67%
7.2a-1	101	14.64%
6.5a2-2	59	8.55%
6.9c-1	41	5.94%
6.7c-1	30	4.35%
7.0c2-2	27	3.91%
6.5a-1	27	3.91%
3.9e-1	18	2.61%
5.2a-1	15	2.17%
6.1c-1	14	2.03%
6.3c2-2	14	2.03%
6.4a-1	12	1.74%
3.8k4-4	9	1.30%
4.0u4-4	9	1.30%
7.2d-5	8	1.16%
7.1f-32	7	1.01%
Other	115	16.67%
Kerio (496 servers)
Version	Number of Servers	Percent
6.7.3	104	20.97%
6.7.0	49	9.88%
6.6.2	45	9.07%
6.5.2	43	8.67%
6.5.0	34	6.85%
6.7.2	28	5.65%
6.4.1	24	4.84%
6.6.1	24	4.84%
6.7.1	21	4.23%
6.3.1	17	3.43%
6.3.0	16	3.23%
6.5.1	15	3.02%
6.4.0	13	2.62%
6.6.0	9	1.81%
6.1.3	9	1.81%
6.2.0	6	1.21%
5.7.9	6	1.21%
6.0.3	5	1.01%
6.4.2	5	1.01%
6.1.0	5	1.01%
Other	18	3.63%
Merak (311 servers)
Version	Number of Servers	Percent
8.0.3	93	29.90%
8.9.1	43	13.83%
8.5.0	24	7.72%
7.5.2	19	6.11%
7.4.5	18	5.79%
8.3.8	15	4.82%
7.6.4	13	4.18%
7.6.1	12	3.86%
7.4.2	7	2.25%
8.3.15	7	2.25%
7.2.0	7	2.25%
6.1.0	4	1.29%
8.9.0	4	1.29%
6.0.8	4	1.29%
Other	41	13.18%
OpenSMTPD (294 servers)
Version	Number of Servers	Percent
Other	294	100.00%
MagicMail (262 servers)
Version	Number of Servers	Percent
Other	262	100.00%
ArGoSoft (219 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	76	34.70%
1.8 (1.8.9.5)	27	12.33%
1.8 (1.8.9.1)	24	10.96%
1.8 (1.8.9.3)	18	8.22%
1.8 (1.8.8.8)	8	3.65%
1.8 (1.8.8.7)	7	3.20%
1.8 (1.8.7.3)	6	2.74%
1.8 (1.8.9.2)	6	2.74%
1.8 (1.8.6.0)	6	2.74%
1.8 (1.8.9.4)	4	1.83%
1.8 (1.8.8.9)	4	1.83%
1.8 (1.8.8.4)	3	1.37%
Other	30	13.70%
Post.Office (164 servers)
Version	Number of Servers	Percent
4.2.2	37	22.56%
4.3	27	16.46%
4.1.2.4	20	12.20%
3.5.3	18	10.98%
4.2.1.3	8	4.88%
3.9.2.3	6	3.66%
3.9.2	4	2.44%
4.0.1	4	2.44%
4.1.1	4	2.44%
3.1.2	4	2.44%
4.1.2.3	3	1.83%
3.8.7.4	3	1.83%
3.5.1	3	1.83%
4.2.1.1	3	1.83%
4.2	3	1.83%
3.5.4	2	1.22%
4.1.0.3	2	1.22%
4.1.0.2	2	1.22%
Other	11	6.71%
Gordano Messaging Suite (GMS) (121 servers)
Version	Number of Servers	Percent
Other	121	100.00%
GroupWise (113 servers)
Version	Number of Servers	Percent
14.2.1	30	26.55%
14.2.0	14	12.39%
6.5.7	8	7.08%
14.0.1	8	7.08%
14.0.2	7	6.19%
14.0.0	7	6.19%
8.0.3	6	5.31%
7.0.4	4	3.54%
7.0.3	4	3.54%
7.0.2	3	2.65%
12.0.4	3	2.65%
8.0.2	3	2.65%
6.0.3	2	1.77%
12.0.1	2	1.77%
6.0.2	2	1.77%
12.0.2	2	1.77%
Other	8	7.08%
Trend Micro (74 servers)
Version	Number of Servers	Percent
5.7	29	39.19%
5.18	13	17.57%
5.5	12	16.22%
7.0	8	10.81%
7.5	4	5.41%
7.1	2	2.70%
3.53	2	2.70%
8.5	1	1.35%
8.5.2	1	1.35%
9.0	1	1.35%
8	1	1.35%
Other	0	0.00%
InterScan VirusWall (32 servers)
Version	Number of Servers	Percent
Other	32	100.00%
VisNetic (31 servers)
Version	Number of Servers	Percent
9.3.2.0	9	29.03%
5.8.6.6	2	6.45%
5.0.2.3	2	6.45%
6.2.2.0	2	6.45%
5.5.8.3	2	6.45%
9.1.4.1	2	6.45%
8.0.3	1	3.23%
7.2.4.0	1	3.23%
8.3.0.1	1	3.23%
9.1.4.0	1	3.23%
8.5.0.5	1	3.23%
8.0.3.1	1	3.23%
7.6.1.0	1	3.23%
5.3.5.0	1	3.23%
5.0.2.0	1	3.23%
9.1.4.1 provided by Techfount Systems Pte Ltd	1	3.23%
8.5.0.8	1	3.23%
7.2.4.1	1	3.23%
Other	0	0.00%
Mirapoint (27 servers)
Version	Number of Servers	Percent
4.4.3-GA	5	18.52%
4.4.5-GA	4	14.81%
4.4.2a-FCS	3	11.11%
4.3.5-GA	3	11.11%
4.4.4-GA	2	7.41%
4.4.7-GA	2	7.41%
4.1.10-GA	2	7.41%
4.1.9-GA	1	3.70%
4.4.5a-GA	1	3.70%
4.3.6-GA	1	3.70%
3.10.10a-GA	1	3.70%
3.7.5a-GA	1	3.70%
4.4.6-GA	1	3.70%
Other	0	0.00%
OpenVMS (14 servers)
Version	Number of Servers	Percent
8.4	5	35.71%
7.3	4	28.57%
8.3	4	28.57%
8.2	1	7.14%
Other	0	0.00%
ModusMail (9 servers)
Version	Number of Servers	Percent
4.35.477.0	5	55.56%
4.1.361.21	2	22.22%
3.2.315.0	1	11.11%
4.35.477.8	1	11.11%
Other	0	0.00%
Mercury (7 servers)
Version	Number of Servers	Percent
3.32	4	57.14%
3.21	1	14.29%
1.48	1	14.29%
4.x	1	14.29%
Other	0	0.00%
WebSTAR V (7 servers)
Version	Number of Servers	Percent
5.4.1	4	57.14%
5.4.0	1	14.29%
5.3.2	1	14.29%
5.3.4	1	14.29%
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%
3.5 (build 1294)	1	16.67%
3.8-Build_3013	1	16.67%
3.8-Build_1080	1	16.67%
Other	0	0.00%
MessageWall (6 servers)
Version	Number of Servers	Percent
1.0.8	6	100.00%
Other	0	0.00%
Neon Mail Server (4 servers)
Version	Number of Servers	Percent
3.1.0	2	50.00%
3.1.2	1	25.00%
3.0.7	1	25.00%
Other	0	0.00%
WebSTAR (2 servers)
Version	Number of Servers	Percent
Other	2	100.00%
MAILsweeper (1 servers)
Version	Number of Servers	Percent
4.3.20.0	1	100.00%
Other	0	0.00%
NetIQ MailMarshal (1 servers)
Version	Number of Servers	Percent
5.5.6.7	1	100.00%
Other	0	0.00%