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	1,628,378	100.0%
Number of Servers that didn't respond	311,306	19.12%
Server didn't open socket	303,525	18.64%
Server didn't provide banner	7,781	0.48%
Server provided banner	1,317,072	80.88%
Server banner identifies software in use	813,746	49.97%

As indicated by the above table, of the 1,628,378 servers queried, only 813,746 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	463,780	56.99%
Postfix	288,883	35.50%
Sendmail	29,671	3.65%
MailEnable	16,436	2.02%
MDaemon	5,776	0.71%
Microsoft	3,392	0.42%
CommuniGate Pro	1,129	0.14%
IMail	1,055	0.13%
XMail	668	0.08%
Qmail Toaster	535	0.07%
SurgeSMTP	447	0.05%
OpenSMTPD	438	0.05%
Lotus Domino	376	0.05%
WinWebMail	370	0.05%
Kerio	159	0.02%
MagicMail	153	0.02%
Merak	132	0.02%
Post.Office	110	0.01%
ArGoSoft	80	0.01%
GroupWise	60	0.01%
Gordano Messaging Suite (GMS)	30	0.00%
Trend Micro	28	0.00%
OpenVMS	8	0.00%
VisNetic	7	0.00%
InterScan VirusWall	7	0.00%
Interscan	4	0.00%
Mercury	3	0.00%
WebSTAR V	3	0.00%
ModusMail	2	0.00%
MessageWall	2	0.00%
WebSTAR	1	0.00%
Neon Mail Server	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (463,780 servers)
Version	Number of Servers	Percent
4.93	347,028	74.83%
4.91	20,652	4.45%
4.94	20,638	4.45%
4.92	15,250	3.29%
4.92.3	10,332	2.23%
4.93.0.4	7,578	1.63%
4.89	7,131	1.54%
4.87	6,527	1.41%
4.84	5,554	1.20%
Other	23,090	4.98%
Postfix (288,883 servers)
Version	Number of Servers	Percent
Other	288,883	100.00%
Sendmail (29,671 servers)
Version	Number of Servers	Percent
8.15.2	13,317	44.88%
8.14.4	5,239	17.66%
8.14.7	2,964	9.99%
8.13.8	2,386	8.04%
8.14.5	2,015	6.79%
8.14.9	798	2.69%
8.13.1	671	2.26%
8.14.3	500	1.69%
Other	1,781	6.00%
MailEnable (16,436 servers)
Version	Number of Servers	Percent
10.27--	3,726	22.67%
10.25--	3,528	21.47%
9.00--	663	4.03%
10.29--	404	2.46%
10.30--	341	2.07%
10.31--	245	1.49%
9.16--	238	1.45%
10.12--	233	1.42%
8.60--	194	1.18%
10.31--10.31	188	1.14%
9.00--9.00	166	1.01%
Other	6,510	39.61%
MDaemon (5,776 servers)
Version	Number of Servers	Percent
19.5.5	912	15.79%
13.5.1	381	6.60%
13.6.3	305	5.28%
13.0.4	229	3.96%
13.0.5	218	3.77%
11.0.3	209	3.62%
11.0.0	193	3.34%
16.5.2	160	2.77%
20.0.2	125	2.16%
12.5.6	123	2.13%
12.5.4	121	2.09%
14.5.2	110	1.90%
19.5.4	110	1.90%
20.0.1	105	1.82%
20.0.0	83	1.44%
10.0.0	77	1.33%
10.1.2	70	1.21%
16.0.4	63	1.09%
10.1.0	62	1.07%
15.0.3	61	1.06%
19.5.3	60	1.04%
19.0.3	59	1.02%
Other	1,940	33.59%
Microsoft (3,392 servers)
Version	Number of Servers	Percent
6.0.3790.4675	1,354	39.92%
8.5.9600.16384	508	14.98%
7.5.7601.17514	371	10.94%
10.0.14393.2608	285	8.40%
6.0.3790.3959	188	5.54%
10.0.17763.1	150	4.42%
5.0.2195.5329	107	3.15%
8.0.9200.16384	91	2.68%
6.0.3790.1830	53	1.56%
7.0.6002.18264	46	1.36%
5.0.2195.6713	42	1.24%
5.0.2195.7381	41	1.21%
Other	156	4.60%
CommuniGate Pro (1,129 servers)
Version	Number of Servers	Percent
6.2.14	71	6.29%
6.2.14.	60	5.31%
6.2.15.	52	4.61%
5.3.13.	33	2.92%
6.2.15	32	2.83%
6.1.20	26	2.30%
6.0.11.	25	2.21%
6.2.12	24	2.13%
6.1.20.	23	2.04%
5.1.16	21	1.86%
6.1.16.	21	1.86%
5.2.20.	20	1.77%
6.2.12.	19	1.68%
6.1.18	19	1.68%
5.4.11	18	1.59%
6.0.11	17	1.51%
6.1.16	16	1.42%
6.3.3	12	1.06%
Other	620	54.92%
IMail (1,055 servers)
Version	Number of Servers	Percent
12.5.8.41	125	11.85%
12.5.7.59	125	11.85%
12.5.6.101	122	11.56%
12.4.1.15	107	10.14%
9.23	64	6.07%
8.22	52	4.93%
12.5.3.93	50	4.74%
12.5.5.115	41	3.89%
8.05	41	3.89%
12.3.0.100	38	3.60%
8.15	28	2.65%
12.5.6.105	28	2.65%
12.5.4.146	22	2.09%
11.03	21	1.99%
10.02	21	1.99%
12.5.5.117	18	1.71%
12.5.7.58	17	1.61%
11.5	13	1.23%
8.00	11	1.04%
7.15	11	1.04%
Other	100	9.48%
XMail (668 servers)
Version	Number of Servers	Percent
1.27	335	50.15%
1.22	219	32.78%
1.26	35	5.24%
1.25	28	4.19%
1.24	23	3.44%
Other	28	4.19%
Qmail Toaster (535 servers)
Version	Number of Servers	Percent
1.3	373	69.72%
1.03	151	28.22%
1.03.5	6	1.12%
Other	5	0.93%
SurgeSMTP (447 servers)
Version	Number of Servers	Percent
7.3o4-4	74	16.55%
7.4o-1	71	15.88%
7.4e-1	33	7.38%
7.3e2-2	27	6.04%
7.1e-1	20	4.47%
7.3i2-2	19	4.25%
7.4q-1	18	4.03%
7.4m-1	17	3.80%
6.5a2-2	17	3.80%
6.7c-1	13	2.91%
7.2i-1	13	2.91%
7.2a-1	9	2.01%
3.9e-1	7	1.57%
6.9c-1	6	1.34%
7.4g-1	6	1.34%
6.5a-1	5	1.12%
7.2e-2	5	1.12%
4.0u4-4	5	1.12%
Other	82	18.34%
OpenSMTPD (438 servers)
Version	Number of Servers	Percent
Other	438	100.00%
Lotus Domino (376 servers)
Version	Number of Servers	Percent
8.5.3FP6	85	22.61%
8.5.3	49	13.03%
8.5.2	19	5.05%
8.5.1	17	4.52%
7.0.2	16	4.26%
8.5	13	3.46%
7.0	11	2.93%
8.5.2FP2	11	2.93%
8.5.3FP5	8	2.13%
8.5.3FP3	8	2.13%
8.5.1FP5	7	1.86%
7.0.3	7	1.86%
8.5.3FP1	7	1.86%
8.5.2FP4HF759	6	1.60%
8.5.3FP4	6	1.60%
8.0.1	6	1.60%
6.5	5	1.33%
6.5.4	5	1.33%
8.5.2FP4	5	1.33%
6.5.3	5	1.33%
8.0	5	1.33%
8.5.2FP3	5	1.33%
6.5.1	4	1.06%
7.0.3FP1	4	1.06%
7.0.4	4	1.06%
Other	58	15.43%
WinWebMail (370 servers)
Version	Number of Servers	Percent
4.2.0.1	84	22.70%
3.9.0.7	67	18.11%
3.8.1.3	39	10.54%
3.9.0.1	25	6.76%
3.8.0.1	18	4.86%
4.1.0.1	15	4.05%
3.7.3.1	11	2.97%
3.8.5.1	10	2.70%
4.0.0.1	10	2.70%
3.7.6.1	9	2.43%
3.8.1.5	9	2.43%
3.8.1.1	9	2.43%
3.8.3.1	7	1.89%
3.8.6.1	7	1.89%
3.9.2.1	7	1.89%
1.0	5	1.35%
3.7.7.3	5	1.35%
4.3.0.1	5	1.35%
3.9.3.1	4	1.08%
3.9.5.3	4	1.08%
Other	20	5.41%
Kerio (159 servers)
Version	Number of Servers	Percent
6.7.3	43	27.04%
6.7.0	25	15.72%
6.6.2	14	8.81%
6.6.1	12	7.55%
6.7.2	12	7.55%
6.7.1	10	6.29%
6.5.0	8	5.03%
6.5.2	7	4.40%
6.3.1	5	3.14%
6.4.1	4	2.52%
6.4.0	4	2.52%
6.3.0	3	1.89%
5.7.9	2	1.26%
5.7.6	2	1.26%
6.5.1	2	1.26%
Other	6	3.77%
MagicMail (153 servers)
Version	Number of Servers	Percent
Other	153	100.00%
Merak (132 servers)
Version	Number of Servers	Percent
8.9.1	38	28.79%
8.0.3	31	23.48%
7.6.1	9	6.82%
9.0.3	8	6.06%
7.4.5	6	4.55%
8.5.0	6	4.55%
8.3.8	6	4.55%
7.5.2	4	3.03%
6.0.8	3	2.27%
7.4.2	2	1.52%
7.6.4	2	1.52%
7.6.0	2	1.52%
7.0.1	2	1.52%
Other	13	9.85%
Post.Office (110 servers)
Version	Number of Servers	Percent
4.3	27	24.55%
4.4	25	22.73%
4.2.2	17	15.45%
3.5.3	9	8.18%
4.1.2.4	8	7.27%
4.2.1.3	4	3.64%
4.0.1	3	2.73%
4.2.1.1	3	2.73%
3.9.2	2	1.82%
Other	12	10.91%
ArGoSoft (80 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	25	31.25%
1.8 (1.8.9.3)	13	16.25%
1.8 (1.8.9.5)	11	13.75%
1.8 (1.8.9.1)	6	7.50%
1.8 (1.8.7.6)	3	3.75%
1.8 (1.8.8.8)	2	2.50%
1.8 (1.8.7.3)	2	2.50%
1.8 (1.8.8.9)	2	2.50%
1.8 (1.8.8.7)	2	2.50%
1.8 (1.8.9.2)	2	2.50%
1.8 (1.8.2.1)	2	2.50%
1.8 (1.8.6.1)	1	1.25%
1.8 (1.8.5.5)	1	1.25%
1.8 (1.8.5.8)	1	1.25%
1.8 (1.8.8.4)	1	1.25%
1.8 (1.8.6.0)	1	1.25%
1.8 (1.8.9.4)	1	1.25%
1.8 (1.8.3.5)	1	1.25%
1.8 (1.8.1.1)	1	1.25%
1.8 (1.8.5.9)	1	1.25%
1.8 (1.8.2.5)	1	1.25%
Other	0	0.00%
GroupWise (60 servers)
Version	Number of Servers	Percent
18.1.1	9	15.00%
14.2.2	8	13.33%
18.2.1	7	11.67%
18.2.0	6	10.00%
14.2.1	5	8.33%
14.2.0	4	6.67%
14.2.3	4	6.67%
18.0.2	4	6.67%
18.1.0	3	5.00%
14.0.0	2	3.33%
14.0.1	1	1.67%
6.5.0	1	1.67%
6.5.5	1	1.67%
7.0.1	1	1.67%
6.0.5	1	1.67%
6.5.2	1	1.67%
18.0.0	1	1.67%
6.0.2	1	1.67%
Other	0	0.00%
Gordano Messaging Suite (GMS) (30 servers)
Version	Number of Servers	Percent
Other	30	100.00%
Trend Micro (28 servers)
Version	Number of Servers	Percent
5.7	9	32.14%
5.18	9	32.14%
5.5	3	10.71%
7.5	2	7.14%
7.0	2	7.14%
7.5ready	1	3.57%
8	1	3.57%
7.1	1	3.57%
Other	0	0.00%
OpenVMS (8 servers)
Version	Number of Servers	Percent
8.4	4	50.00%
7.3	3	37.50%
8.3	1	12.50%
Other	0	0.00%
VisNetic (7 servers)
Version	Number of Servers	Percent
9.3.2.0	5	71.43%
8.0.3	1	14.29%
6.2.2.0	1	14.29%
Other	0	0.00%
InterScan VirusWall (7 servers)
Version	Number of Servers	Percent
Other	7	100.00%
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%
Mercury (3 servers)
Version	Number of Servers	Percent
4.x	1	33.33%
4	1	33.33%
1.48	1	33.33%
Other	0	0.00%
WebSTAR V (3 servers)
Version	Number of Servers	Percent
5.4.1	2	66.67%
5.3.2	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%
Neon Mail Server (1 servers)
Version	Number of Servers	Percent
3.1.2	1	100.00%
Other	0	0.00%