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	1,323,609	100.0%
Number of Servers that didn't respond	278,399	21.03%
Server didn't open socket	274,629	20.75%
Server didn't provide banner	3,770	0.28%
Server provided banner	1,045,210	78.97%
Server banner identifies software in use	683,337	51.63%

As indicated by the above table, of the 1,323,609 servers queried, only 683,337 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	395,010	57.81%
Postfix	240,810	35.24%
Sendmail	23,852	3.49%
MailEnable	13,461	1.97%
MDaemon	3,720	0.54%
Microsoft	2,056	0.30%
CommuniGate Pro	879	0.13%
IMail	723	0.11%
XMail	511	0.07%
Qmail Toaster	492	0.07%
OpenSMTPD	444	0.06%
SurgeSMTP	389	0.06%
Lotus Domino	201	0.03%
WinWebMail	173	0.03%
MagicMail	154	0.02%
Kerio	103	0.02%
Merak	96	0.01%
Post.Office	81	0.01%
ArGoSoft	55	0.01%
GroupWise	49	0.01%
Gordano Messaging Suite (GMS)	31	0.00%
Trend Micro	13	0.00%
OpenVMS	12	0.00%
VisNetic	5	0.00%
InterScan VirusWall	5	0.00%
ModusMail	2	0.00%
Interscan	2	0.00%
Mercury	2	0.00%
MessageWall	2	0.00%
Neon Mail Server	1	0.00%
WebSTAR V	1	0.00%
WebSTAR	1	0.00%
Mirapoint	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (395,010 servers)
Version	Number of Servers	Percent
4.94.2	297,269	75.26%
4.93	28,209	7.14%
4.95	20,254	5.13%
4.92	7,553	1.91%
4.94	7,057	1.79%
4.91	5,387	1.36%
4.89	4,244	1.07%
4.92.3	4,009	1.01%
Other	21,028	5.32%
Postfix (240,810 servers)
Version	Number of Servers	Percent
Other	240,810	100.00%
Sendmail (23,852 servers)
Version	Number of Servers	Percent
8.15.2	11,948	50.09%
8.14.4	3,117	13.07%
8.14.7	3,062	12.84%
8.13.8	1,450	6.08%
8.14.5	1,320	5.53%
8.16.1	686	2.88%
8.13.1	390	1.64%
8.14.9	379	1.59%
8.14.3	266	1.12%
8.17.1	251	1.05%
Other	983	4.12%
MailEnable (13,461 servers)
Version	Number of Servers	Percent
10.34--	5,249	38.99%
10.27--	877	6.52%
10.25--	709	5.27%
10.37--	427	3.17%
9.00--	383	2.85%
10.37--10.37	276	2.05%
10.31--	219	1.63%
10.37-10.37-	211	1.57%
10.31-10.31-	188	1.40%
10.29--	159	1.18%
9.16--	142	1.05%
Other	4,621	34.33%
MDaemon (3,720 servers)
Version	Number of Servers	Percent
21.5.1	299	8.04%
21.5.2	268	7.20%
13.5.1	247	6.64%
13.0.4	144	3.87%
21.0.3	143	3.84%
13.0.5	140	3.76%
11.0.0	130	3.49%
11.0.3	127	3.41%
19.5.4	124	3.33%
19.5.5	106	2.85%
16.5.2	97	2.61%
21.5.0	96	2.58%
21.0.2	84	2.26%
12.5.6	76	2.04%
14.5.2	70	1.88%
21.0.1	64	1.72%
12.5.4	49	1.32%
20.0.4	46	1.24%
10.1.2	41	1.10%
15.0.3	40	1.08%
10.0.0	40	1.08%
Other	1,289	34.65%
Microsoft (2,056 servers)
Version	Number of Servers	Percent
6.0.3790.4675	657	31.96%
8.5.9600.16384	327	15.90%
10.0.14393.4169	198	9.63%
7.5.7601.17514	181	8.80%
10.0.17763.1697	158	7.68%
6.0.3790.3959	129	6.27%
5.0.2195.5329	79	3.84%
8.0.9200.16384	58	2.82%
5.0.2195.6713	36	1.75%
10.0.17763.1	31	1.51%
7.0.6002.18264	28	1.36%
6.0.3790.1830	27	1.31%
10.0.14393.2608	22	1.07%
Other	125	6.08%
CommuniGate Pro (879 servers)
Version	Number of Servers	Percent
6.2.15	94	10.69%
6.2.14	86	9.78%
6.1.20	43	4.89%
6.0.11	29	3.30%
6.2.12	26	2.96%
5.2.20	23	2.62%
6.1.16	21	2.39%
6.3.9	21	2.39%
6.3.6	19	2.16%
5.4.11	18	2.05%
6.3.5	17	1.93%
6.0.9	16	1.82%
6.1.18	15	1.71%
5.1.16	14	1.59%
6.3.3	13	1.48%
7.1.1	12	1.37%
6.3.7	12	1.37%
5.2.3	10	1.14%
6.2.7	10	1.14%
6.1.11	9	1.02%
6.1.10	9	1.02%
6.2.10	9	1.02%
6.2.16	9	1.02%
6.3.4	9	1.02%
Other	335	38.11%
IMail (723 servers)
Version	Number of Servers	Percent
12.5.8.41	123	17.01%
12.5.7.59	76	10.51%
12.5.6.101	76	10.51%
12.4.1.15	56	7.75%
9.23	44	6.09%
8.05	30	4.15%
12.5.6.105	30	4.15%
12.5.3.93	29	4.01%
8.22	28	3.87%
12.5.5.115	27	3.73%
12.3.0.100	23	3.18%
12.5.8.54	22	3.04%
10.02	19	2.63%
8.15	18	2.49%
12.5.4.146	16	2.21%
12.5.5.117	13	1.80%
7.07	8	1.11%
12.5.7.58	8	1.11%
Other	77	10.65%
XMail (511 servers)
Version	Number of Servers	Percent
1.27	275	53.82%
1.22	159	31.12%
1.25	23	4.50%
1.26	20	3.91%
1.24	15	2.94%
Other	19	3.72%
Qmail Toaster (492 servers)
Version	Number of Servers	Percent
1.3	344	69.92%
1.03	136	27.64%
1.03.5	7	1.42%
Other	5	1.02%
OpenSMTPD (444 servers)
Version	Number of Servers	Percent
Other	444	100.00%
SurgeSMTP (389 servers)
Version	Number of Servers	Percent
7.3o4-4	53	13.62%
7.6h-2	44	11.31%
7.5c-1	33	8.48%
7.5a-1	24	6.17%
7.3e2-2	22	5.66%
7.6d-1	17	4.37%
7.4o-1	16	4.11%
7.1e-1	16	4.11%
7.4e-1	15	3.86%
7.6j-1	15	3.86%
6.7c-1	9	2.31%
7.3i2-2	8	2.06%
7.2i-1	7	1.80%
6.5a2-2	7	1.80%
7.6m-1	6	1.54%
7.5d-7	6	1.54%
6.5a-1	5	1.29%
7.4m-1	4	1.03%
6.9c-1	4	1.03%
7.2a-1	4	1.03%
3.9e-1	4	1.03%
Other	70	17.99%
Lotus Domino (201 servers)
Version	Number of Servers	Percent
8.5.3FP6	41	20.40%
8.5.3	34	16.92%
8.5.1	10	4.98%
7.0	7	3.48%
8.5.2	7	3.48%
8.5.2FP2	7	3.48%
8.5	7	3.48%
7.0.3	6	2.99%
8.5.3FP3	5	2.49%
7.0.2	5	2.49%
6.5	4	1.99%
8.5.1FP5	4	1.99%
8.0	4	1.99%
8.5.3FP1	3	1.49%
8.5.3FP4	3	1.49%
6.5.1	3	1.49%
8.0.1	3	1.49%
5.0.8	3	1.49%
8.5.2FP3	3	1.49%
7.0.3FP1	3	1.49%
Other	39	19.40%
WinWebMail (173 servers)
Version	Number of Servers	Percent
4.2.0.1	33	19.08%
3.9.0.7	23	13.29%
4.4.0.1	20	11.56%
3.8.1.3	17	9.83%
4.3.0.1	14	8.09%
3.7.3.1	6	3.47%
3.9.0.1	6	3.47%
3.8.1.1	5	2.89%
3.8.0.1	5	2.89%
4.0.0.1	5	2.89%
3.7.7.3	4	2.31%
3.8.6.1	4	2.31%
3.7.6.1	4	2.31%
4.1.0.1	3	1.73%
1.0	3	1.73%
3.8.1.5	3	1.73%
3.8.3.1	2	1.16%
3.9.3.1	2	1.16%
3.7.0.3	2	1.16%
3.8.2.1	2	1.16%
3.9.5.3	2	1.16%
3.7.1.1	2	1.16%
3.8.5.1	2	1.16%
3.7.5.1	2	1.16%
Other	2	1.16%
MagicMail (154 servers)
Version	Number of Servers	Percent
Other	154	100.00%
Kerio (103 servers)
Version	Number of Servers	Percent
6.7.3	25	24.27%
6.7.0	15	14.56%
6.6.1	11	10.68%
6.6.2	9	8.74%
6.7.1	7	6.80%
6.7.2	7	6.80%
6.5.2	6	5.83%
6.5.0	6	5.83%
6.3.1	2	1.94%
6.4.1	2	1.94%
6.3.0	2	1.94%
5.7.9	2	1.94%
6.0.5	2	1.94%
5.7.6	2	1.94%
6.5.1	2	1.94%
Other	3	2.91%
Merak (96 servers)
Version	Number of Servers	Percent
8.9.1	29	30.21%
8.0.3	19	19.79%
7.6.1	7	7.29%
8.3.8	5	5.21%
9.0.3	5	5.21%
7.4.5	4	4.17%
8.5.0	3	3.12%
7.4.2	2	2.08%
7.5.2	2	2.08%
7.6.4	2	2.08%
7.6.0	2	2.08%
6.0.8	2	2.08%
8.0.1	1	1.04%
8.9.2	1	1.04%
8.3.6	1	1.04%
6.1.0	1	1.04%
4.4.2	1	1.04%
8.3.0	1	1.04%
4.2.1	1	1.04%
5.8.2	1	1.04%
8.9.7	1	1.04%
7.4.4	1	1.04%
6.0.7	1	1.04%
7.0.1	1	1.04%
8.9.0	1	1.04%
6.0.3	1	1.04%
Other	0	0.00%
Post.Office (81 servers)
Version	Number of Servers	Percent
4.4	25	30.86%
4.3	16	19.75%
4.2.2	12	14.81%
3.5.3	7	8.64%
4.1.2.4	6	7.41%
3.9.2	2	2.47%
4.2	2	2.47%
4.2.1.1	2	2.47%
4.2.1.3	2	2.47%
4.1.1	1	1.23%
4.0.1	1	1.23%
3.5.3J	1	1.23%
3.5.1	1	1.23%
4.1	1	1.23%
3.1.2	1	1.23%
4.2.1	1	1.23%
Other	0	0.00%
ArGoSoft (55 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	17	30.91%
1.8 (1.8.9.3)	8	14.55%
1.8 (1.8.9.5)	7	12.73%
1.8 (1.8.8.8)	3	5.45%
1.8 (1.8.9.1)	3	5.45%
1.8 (1.8.7.3)	2	3.64%
1.8 (1.8.8.9)	2	3.64%
1.8 (1.8.8.7)	2	3.64%
1.8 (1.8.7.6)	2	3.64%
1.8 (1.8.9.2)	2	3.64%
1.8 (1.8.2.1)	2	3.64%
1.8 (1.8.5.8)	1	1.82%
1.8 (1.8.8.4)	1	1.82%
1.8 (1.8.9.4)	1	1.82%
1.8 (1.8.3.5)	1	1.82%
1.8 (1.8.2.5)	1	1.82%
Other	0	0.00%
GroupWise (49 servers)
Version	Number of Servers	Percent
18.3.1	11	22.45%
18.2.1	9	18.37%
18.1.1	5	10.20%
18.2.0	5	10.20%
14.2.2	3	6.12%
14.2.1	2	4.08%
18.3.0	2	4.08%
18.1.0	2	4.08%
14.0.0	2	4.08%
6.5.7	1	2.04%
18.4.0	1	2.04%
18.0.0	1	2.04%
6.5.0	1	2.04%
8.0.3	1	2.04%
14.2.0	1	2.04%
14.2.3	1	2.04%
18.0.2	1	2.04%
Other	0	0.00%
Gordano Messaging Suite (GMS) (31 servers)
Version	Number of Servers	Percent
Other	31	100.00%
Trend Micro (13 servers)
Version	Number of Servers	Percent
5.7	4	30.77%
5.18	4	30.77%
5.5	2	15.38%
7.5ready	1	7.69%
7.0	1	7.69%
7.1	1	7.69%
Other	0	0.00%
OpenVMS (12 servers)
Version	Number of Servers	Percent
8.4	6	50.00%
7.3	4	33.33%
8.3	1	8.33%
8.2	1	8.33%
Other	0	0.00%
VisNetic (5 servers)
Version	Number of Servers	Percent
9.3.2.0	3	60.00%
8.0.3	1	20.00%
5.0.1	1	20.00%
Other	0	0.00%
InterScan VirusWall (5 servers)
Version	Number of Servers	Percent
Other	5	100.00%
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%
3.81-Build_1022	1	50.00%
Other	0	0.00%
Mercury (2 servers)
Version	Number of Servers	Percent
1.48	1	50.00%
4	1	50.00%
Other	0	0.00%
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
3.1.2	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%
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%