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	1,108,293	100.0%
Number of Servers that didn't respond	231,480	20.89%
Server didn't open socket	228,806	20.64%
Server didn't provide banner	2,674	0.24%
Server provided banner	876,813	79.11%
Server banner identifies software in use	560,372	50.56%

As indicated by the above table, of the 1,108,293 servers queried, only 560,372 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	315,524	56.31%
Postfix	208,725	37.25%
Sendmail	19,045	3.40%
MailEnable	10,230	1.83%
MDaemon	2,401	0.43%
Microsoft	1,221	0.22%
CommuniGate Pro	722	0.13%
OpenSMTPD	498	0.09%
XMail	418	0.07%
IMail	415	0.07%
SurgeSMTP	302	0.05%
Qmail Toaster	181	0.03%
WinWebMail	142	0.03%
MagicMail	138	0.02%
Lotus Domino	120	0.02%
Post.Office	64	0.01%
Kerio	60	0.01%
Merak	57	0.01%
GroupWise	34	0.01%
ArGoSoft	33	0.01%
Gordano Messaging Suite (GMS)	15	0.00%
OpenVMS	8	0.00%
InterScan VirusWall	5	0.00%
Trend Micro	4	0.00%
ModusMail	2	0.00%
VisNetic	2	0.00%
MessageWall	2	0.00%
Mercury	1	0.00%
WebSTAR	1	0.00%
Neon Mail Server	1	0.00%
Mirapoint	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (315,524 servers)
Version	Number of Servers	Percent
4.96.2	201,038	63.72%
4.97.1	46,833	14.84%
4.96	13,642	4.32%
4.95	10,606	3.36%
4.93	9,457	3.00%
4.94.2	6,850	2.17%
4.96.1	5,332	1.69%
4.92	3,995	1.27%
Other	17,771	5.63%
Postfix (208,725 servers)
Version	Number of Servers	Percent
Other	208,725	100.00%
Sendmail (19,045 servers)
Version	Number of Servers	Percent
8.16.1	6,929	36.38%
8.15.2	4,711	24.74%
8.14.7	2,064	10.84%
8.14.4	1,616	8.49%
8.13.8	832	4.37%
8.14.5	708	3.72%
8.17.1	355	1.86%
8.18.1	267	1.40%
8.14.9	255	1.34%
8.13.1	198	1.04%
Other	1,110	5.83%
MailEnable (10,230 servers)
Version	Number of Servers	Percent
10.46--	4,346	42.48%
10.34--	430	4.20%
10.43--	336	3.28%
10.47--	320	3.13%
10.27--	294	2.87%
10.25--	264	2.58%
10.48--	248	2.42%
10.47--10.47	177	1.73%
10.43-10.43-	169	1.65%
10.42--	156	1.52%
10.48--10.48	156	1.52%
10.47-10.47-	146	1.43%
9.00--	137	1.34%
10.48-10.48-	121	1.18%
10.45--	111	1.09%
Other	2,819	27.56%
MDaemon (2,401 servers)
Version	Number of Servers	Percent
23.5.3	350	14.58%
13.5.1	109	4.54%
23.5.1	90	3.75%
13.0.5	88	3.67%
19.5.4	86	3.58%
13.0.4	85	3.54%
23.0.2	82	3.42%
23.5.2	82	3.42%
11.0.3	78	3.25%
11.0.0	76	3.17%
23.5.0	65	2.71%
16.5.2	60	2.50%
21.5.4	60	2.50%
14.5.2	52	2.17%
23.0.1	51	2.12%
12.5.6	41	1.71%
21.5.2	35	1.46%
19.5.5	33	1.37%
10.0.0	27	1.12%
22.0.3	25	1.04%
Other	826	34.40%
Microsoft (1,221 servers)
Version	Number of Servers	Percent
6.0.3790.4675	308	25.23%
10.0.17763.1697	227	18.59%
8.5.9600.16384	149	12.20%
10.0.14393.4169	137	11.22%
7.5.7601.17514	85	6.96%
6.0.3790.3959	67	5.49%
5.0.2195.5329	58	4.75%
10.0.20348.1	26	2.13%
8.0.9200.16384	25	2.05%
5.0.2195.6713	22	1.80%
10.0.17763.1	21	1.72%
6.0.3790.1830	16	1.31%
Other	80	6.55%
CommuniGate Pro (722 servers)
Version	Number of Servers	Percent
6.2.15	62	8.59%
6.2.14	50	6.93%
6.4.1	41	5.68%
6.3.17	30	4.16%
6.3.20	28	3.88%
6.1.20	28	3.88%
6.4.0	23	3.19%
6.3.18	20	2.77%
5.4.11	14	1.94%
6.0.11	14	1.94%
5.1.16	12	1.66%
5.2.20	12	1.66%
6.3.19	11	1.52%
6.2.12	11	1.52%
6.1.16	11	1.52%
6.1.18	10	1.39%
6.1.19	9	1.25%
6.0.9	9	1.25%
7.1.4	8	1.11%
6.3.14	8	1.11%
6.3.15	8	1.11%
6.3.16	8	1.11%
Other	295	40.86%
OpenSMTPD (498 servers)
Version	Number of Servers	Percent
Other	498	100.00%
XMail (418 servers)
Version	Number of Servers	Percent
1.27	264	63.16%
1.22	99	23.68%
1.26	15	3.59%
1.25	13	3.11%
1.24	12	2.87%
1.15	5	1.20%
Other	10	2.39%
IMail (415 servers)
Version	Number of Servers	Percent
12.6.1.4	84	20.24%
12.5.6.101	28	6.75%
9.23	24	5.78%
12.4.1.15	24	5.78%
12.5.8.41	23	5.54%
8.05	19	4.58%
12.5.3.93	18	4.34%
12.5.7.59	17	4.10%
8.22	17	4.10%
12.5.6.105	17	4.10%
12.5.8.59	16	3.86%
12.5.8.58	14	3.37%
12.5.4.146	11	2.65%
12.6.0.17	9	2.17%
12.6.0.20	9	2.17%
12.5.5.115	8	1.93%
12.3.0.100	7	1.69%
7.07	6	1.45%
11.5	6	1.45%
12.5.8.54	5	1.20%
8.00	5	1.20%
10.02	5	1.20%
8.15	5	1.20%
Other	38	9.16%
SurgeSMTP (302 servers)
Version	Number of Servers	Percent
7.8a-1	45	14.90%
7.7c-1	30	9.93%
7.3o4-4	21	6.95%
7.6j-1	20	6.62%
7.7i-1	19	6.29%
7.3e2-2	15	4.97%
7.5c-1	14	4.64%
7.1e-1	10	3.31%
7.4e-1	10	3.31%
7.4o-1	9	2.98%
7.6u-1	9	2.98%
6.9c-1	8	2.65%
7.5a-1	7	2.32%
6.5a2-2	6	1.99%
6.7c-1	5	1.66%
7.2i-1	5	1.66%
7.6h-2	5	1.66%
7.7g-1	5	1.66%
7.4m-1	4	1.32%
7.7h-3	4	1.32%
7.6d-1	4	1.32%
Other	47	15.56%
Qmail Toaster (181 servers)
Version	Number of Servers	Percent
1.03	102	56.35%
1.3	73	40.33%
1.03.5	4	2.21%
1.03.6	2	1.10%
Other	0	0.00%
WinWebMail (142 servers)
Version	Number of Servers	Percent
4.4.0.1	20	14.08%
4.5.0.1	19	13.38%
3.8.1.3	16	11.27%
4.2.0.1	14	9.86%
3.9.0.7	13	9.15%
3.8.0.1	7	4.93%
4.3.0.1	7	4.93%
4.0.0.1	6	4.23%
3.9.0.1	5	3.52%
3.7.7.3	4	2.82%
3.7.3.1	4	2.82%
4.1.0.1	4	2.82%
3.9.3.1	3	2.11%
3.7.1.1	3	2.11%
3.8.1.5	2	1.41%
3.8.6.1	2	1.41%
3.8.1.1	2	1.41%
Other	11	7.75%
MagicMail (138 servers)
Version	Number of Servers	Percent
Other	138	100.00%
Lotus Domino (120 servers)
Version	Number of Servers	Percent
8.5.3	21	17.50%
8.5.3FP6	20	16.67%
8.5.1	7	5.83%
7.0	6	5.00%
8.5.2	6	5.00%
8.5	5	4.17%
7.0.2	5	4.17%
8.5.2FP1	4	3.33%
6.5	4	3.33%
7.0.3	4	3.33%
8.5.3FP3	4	3.33%
6.5.1	3	2.50%
6.5.3	3	2.50%
8.0	3	2.50%
8.5.3FP1	2	1.67%
6.5.2	2	1.67%
8.5.2FP2	2	1.67%
8.0.1	2	1.67%
7.5.1	2	1.67%
Other	15	12.50%
Post.Office (64 servers)
Version	Number of Servers	Percent
4.4	28	43.75%
4.2.2	11	17.19%
4.3	5	7.81%
3.5.3	5	7.81%
4.1.2.4	4	6.25%
3.5.1	3	4.69%
3.9.2	2	3.12%
4.2.1.3	2	3.12%
4.2	1	1.56%
4.0.1	1	1.56%
3.1.2	1	1.56%
4.2.1.1	1	1.56%
Other	0	0.00%
Kerio (60 servers)
Version	Number of Servers	Percent
6.7.3	12	20.00%
6.7.0	11	18.33%
6.6.1	7	11.67%
6.6.2	5	8.33%
6.7.1	4	6.67%
6.7.2	4	6.67%
6.5.2	3	5.00%
5.7.9	2	3.33%
6.5.1	2	3.33%
6.4.1	1	1.67%
6.0.3	1	1.67%
6.0.5	1	1.67%
5.7.6	1	1.67%
6.0.8	1	1.67%
6.3.1	1	1.67%
6.6.0	1	1.67%
6.4.0	1	1.67%
6.3.0	1	1.67%
6.5.0	1	1.67%
Other	0	0.00%
Merak (57 servers)
Version	Number of Servers	Percent
8.9.1	16	28.07%
8.0.3	12	21.05%
7.6.1	8	14.04%
8.3.8	4	7.02%
7.4.5	2	3.51%
6.0.8	2	3.51%
8.0.1	1	1.75%
8.9.2	1	1.75%
8.3.6	1	1.75%
6.1.0	1	1.75%
7.6.4	1	1.75%
9.0.3	1	1.75%
8.5.0	1	1.75%
7.5.2	1	1.75%
4.2.1	1	1.75%
7.6.0	1	1.75%
7.4.4	1	1.75%
7.0.1	1	1.75%
5.8.2	1	1.75%
Other	0	0.00%
GroupWise (34 servers)
Version	Number of Servers	Percent
18.3.1	9	26.47%
18.2.1	3	8.82%
24.1.0	2	5.88%
18.1.1	2	5.88%
18.5.0	2	5.88%
18.2.0	2	5.88%
24.2.0	2	5.88%
14.2.1	1	2.94%
14.2.3	1	2.94%
18.0.0	1	2.94%
6.5.0	1	2.94%
18.4.1	1	2.94%
18.3.0	1	2.94%
23.4.0	1	2.94%
18.1.0	1	2.94%
14.2.2	1	2.94%
14.0.0	1	2.94%
18.0.2	1	2.94%
18.0.1	1	2.94%
Other	0	0.00%
ArGoSoft (33 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	8	24.24%
1.8 (1.8.9.3)	5	15.15%
1.8 (1.8.9.5)	4	12.12%
1.8 (1.8.9.1)	3	9.09%
1.8 (1.8.8.8)	2	6.06%
1.8 (1.8.7.3)	1	3.03%
1.8 (1.8.8.4)	1	3.03%
1.8 (1.8.3.5)	1	3.03%
1.8 (1.8.7.6)	1	3.03%
1.8 (1.8.1.7)	1	3.03%
1.8 (1.8.6.0)	1	3.03%
1.8 (1.8.8.7)	1	3.03%
1.8 (1.8.9.4)	1	3.03%
1.8 (1.8.5.9)	1	3.03%
1.8 (1.8.9.2)	1	3.03%
1.8 (1.8.8.9)	1	3.03%
Other	0	0.00%
Gordano Messaging Suite (GMS) (15 servers)
Version	Number of Servers	Percent
Other	15	100.00%
OpenVMS (8 servers)
Version	Number of Servers	Percent
8.4	5	62.50%
7.3	2	25.00%
8.2	1	12.50%
Other	0	0.00%
InterScan VirusWall (5 servers)
Version	Number of Servers	Percent
Other	5	100.00%
Trend Micro (4 servers)
Version	Number of Servers	Percent
5.5	2	50.00%
5.18	2	50.00%
Other	0	0.00%
ModusMail (2 servers)
Version	Number of Servers	Percent
4.1.361.21	2	100.00%
Other	0	0.00%
VisNetic (2 servers)
Version	Number of Servers	Percent
8.0.3	1	50.00%
9.3.2.0	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%
Mercury (1 servers)
Version	Number of Servers	Percent
1.48	1	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%
Mirapoint (1 servers)
Version	Number of Servers	Percent
4.4.5-GA	1	100.00%
Other	0	0.00%