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	754,375	100.0%
Number of Servers that didn't respond	124,833	16.55%
Server didn't open socket	123,292	16.34%
Server didn't provide banner	1,541	0.20%
Server provided banner	629,542	83.45%
Server banner identifies software in use	420,344	55.72%

As indicated by the above table, of the 754,375 servers queried, only 420,344 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	249,347	59.32%
Postfix	144,898	34.47%
Sendmail	14,206	3.38%
MailEnable	7,617	1.81%
MDaemon	1,531	0.36%
Microsoft	696	0.17%
CommuniGate Pro	486	0.12%
XMail	288	0.07%
OpenSMTPD	279	0.07%
IMail	230	0.05%
SurgeSMTP	207	0.05%
Qmail Toaster	132	0.03%
MagicMail	103	0.02%
Lotus Domino	72	0.02%
WinWebMail	59	0.01%
Merak	47	0.01%
Kerio	44	0.01%
Post.Office	41	0.01%
ArGoSoft	23	0.01%
GroupWise	18	0.00%
OpenVMS	6	0.00%
Gordano Messaging Suite (GMS)	4	0.00%
VisNetic	3	0.00%
Trend Micro	2	0.00%
ModusMail	1	0.00%
Mercury	1	0.00%
Neon Mail Server	1	0.00%
WebSTAR	1	0.00%
Mirapoint	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (249,347 servers)
Version	Number of Servers	Percent
4.96.2	146,416	58.72%
4.97.1	55,691	22.33%
4.96	9,953	3.99%
4.93	6,668	2.67%
4.95	6,620	2.65%
4.94.2	5,050	2.03%
4.96.1	2,960	1.19%
4.92	2,873	1.15%
Other	13,116	5.26%
Postfix (144,898 servers)
Version	Number of Servers	Percent
Other	144,898	100.00%
Sendmail (14,206 servers)
Version	Number of Servers	Percent
8.16.1	5,895	41.50%
8.15.2	3,561	25.07%
8.14.7	1,294	9.11%
8.14.4	1,061	7.47%
8.13.8	568	4.00%
8.14.5	315	2.22%
8.18.1	284	2.00%
8.17.1	208	1.46%
8.14.9	194	1.37%
Other	826	5.81%
MailEnable (7,617 servers)
Version	Number of Servers	Percent
10.48--	2,612	34.29%
10.46--	1,124	14.76%
10.34--	310	4.07%
10.43--	231	3.03%
10.27--	195	2.56%
10.25--	188	2.47%
10.47--	162	2.13%
10.48--10.48	154	2.02%
10.43-10.43-	116	1.52%
10.48-10.48-	114	1.50%
10.47--10.47	114	1.50%
10.42--	105	1.38%
9.00--	94	1.23%
10.47-10.47-	93	1.22%
9.00--9.00	80	1.05%
Other	1,925	25.27%
MDaemon (1,531 servers)
Version	Number of Servers	Percent
24.0.1	163	10.65%
23.5.3	78	5.09%
24.0.0	66	4.31%
13.5.1	65	4.25%
13.0.5	60	3.92%
11.0.0	52	3.40%
13.0.4	51	3.33%
11.0.3	51	3.33%
23.5.1	42	2.74%
23.5.2	39	2.55%
14.5.2	37	2.42%
21.5.4	37	2.42%
16.5.2	36	2.35%
23.0.1	34	2.22%
23.0.2	31	2.02%
19.5.4	30	1.96%
23.5.0	29	1.89%
12.5.6	28	1.83%
21.5.2	22	1.44%
22.0.3	21	1.37%
19.5.5	20	1.31%
Other	539	35.21%
Microsoft (696 servers)
Version	Number of Servers	Percent
6.0.3790.4675	173	24.86%
10.0.17763.1697	124	17.82%
10.0.14393.4169	97	13.94%
8.5.9600.16384	78	11.21%
7.5.7601.17514	45	6.47%
5.0.2195.5329	41	5.89%
6.0.3790.3959	40	5.75%
10.0.20348.1	14	2.01%
5.0.2195.6713	13	1.87%
8.0.9200.16384	12	1.72%
10.0.17763.1	8	1.15%
7.0.6002.18264	7	1.01%
Other	44	6.32%
CommuniGate Pro (486 servers)
Version	Number of Servers	Percent
6.2.15	46	9.47%
6.2.14	38	7.82%
6.4.1	26	5.35%
6.3.17	22	4.53%
6.3.18	19	3.91%
6.1.20	16	3.29%
6.3.20	16	3.29%
6.4.0	12	2.47%
6.3.19	10	2.06%
6.0.11	10	2.06%
6.0.9	9	1.85%
5.4.11	8	1.65%
6.3.14	8	1.65%
5.1.16	8	1.65%
5.2.20	7	1.44%
6.3.6	7	1.44%
6.1.18	7	1.44%
6.1.19	7	1.44%
6.3.15	6	1.23%
6.1.16	6	1.23%
5.1.7	6	1.23%
6.3.13	6	1.23%
6.2.12	5	1.03%
Other	181	37.24%
XMail (288 servers)
Version	Number of Servers	Percent
1.27	185	64.24%
1.22	64	22.22%
1.26	12	4.17%
1.25	9	3.12%
1.15	5	1.74%
1.24	4	1.39%
Other	9	3.12%
OpenSMTPD (279 servers)
Version	Number of Servers	Percent
Other	279	100.00%
IMail (230 servers)
Version	Number of Servers	Percent
12.6.1.4	38	16.52%
9.23	14	6.09%
12.5.8.59	14	6.09%
12.5.8.41	14	6.09%
12.5.6.101	13	5.65%
12.5.6.105	13	5.65%
12.5.3.93	10	4.35%
12.5.8.58	10	4.35%
12.5.7.59	9	3.91%
12.4.1.15	8	3.48%
8.05	8	3.48%
8.22	7	3.04%
12.6.0.20	5	2.17%
7.07	5	2.17%
8.15	5	2.17%
12.5.5.117	5	2.17%
12.6.0.17	5	2.17%
11.5	5	2.17%
12.5.4.146	4	1.74%
12.3.0.100	4	1.74%
12.5.8.54	3	1.30%
6.04	3	1.30%
12.5.5.115	3	1.30%
8.00	3	1.30%
10.02	3	1.30%
Other	19	8.26%
SurgeSMTP (207 servers)
Version	Number of Servers	Percent
7.8a-1	34	16.43%
7.3o4-4	18	8.70%
7.7c-1	16	7.73%
7.3e2-2	13	6.28%
7.6j-1	13	6.28%
7.8c2-2	11	5.31%
7.5c-1	9	4.35%
6.9c-1	8	3.86%
7.7i-1	7	3.38%
7.4o-1	7	3.38%
7.5a-1	6	2.90%
7.1e-1	6	2.90%
6.5a2-2	6	2.90%
7.6s-1	4	1.93%
7.6u-1	4	1.93%
7.4e-1	4	1.93%
7.6d-1	4	1.93%
7.7h-3	3	1.45%
7.8b-2	3	1.45%
6.7c-1	3	1.45%
Other	28	13.53%
Qmail Toaster (132 servers)
Version	Number of Servers	Percent
1.03	78	59.09%
1.3	51	38.64%
1.03.5	2	1.52%
Other	1	0.76%
MagicMail (103 servers)
Version	Number of Servers	Percent
Other	103	100.00%
Lotus Domino (72 servers)
Version	Number of Servers	Percent
8.5.3	14	19.44%
8.5.3FP6	8	11.11%
7.0	4	5.56%
8.5.1	4	5.56%
7.0.3	3	4.17%
8.5.2FP1	2	2.78%
8.5.3FP1	2	2.78%
8.5	2	2.78%
8.5.2FP2	2	2.78%
8.5.2	2	2.78%
6.5	2	2.78%
8.5.3FP3	2	2.78%
7.0.4FP2	2	2.78%
7.5.1	2	2.78%
8.0.1	2	2.78%
7.0.3FP1	2	2.78%
8.5.3FP2	1	1.39%
8.5.3FP6HF1215	1	1.39%
6.5.4	1	1.39%
6.5.1	1	1.39%
6.0.1	1	1.39%
5.0.13a	1	1.39%
5.0.8	1	1.39%
8.5.3FP5	1	1.39%
7.0.4FP1	1	1.39%
8.0	1	1.39%
8.5.1FP3	1	1.39%
8.5.2FP4	1	1.39%
7.0.2	1	1.39%
6.6.6	1	1.39%
6.5.2	1	1.39%
5.0.13	1	1.39%
6.5.3	1	1.39%
Other	0	0.00%
WinWebMail (59 servers)
Version	Number of Servers	Percent
4.5.0.1	10	16.95%
4.4.0.1	9	15.25%
4.2.0.1	9	15.25%
3.9.0.7	8	13.56%
3.8.1.3	5	8.47%
4.0.0.1	3	5.08%
3.8.0.1	2	3.39%
3.8.6.1	2	3.39%
3.7.3.1	2	3.39%
4.3.0.1	2	3.39%
1.0	1	1.69%
3.7.6.1	1	1.69%
3.8.5.1	1	1.69%
3.9.3.1	1	1.69%
4.1.0.1	1	1.69%
3.8.1.6	1	1.69%
3.7.5.1	1	1.69%
Other	0	0.00%
Merak (47 servers)
Version	Number of Servers	Percent
8.9.1	12	25.53%
8.0.3	11	23.40%
7.6.1	7	14.89%
8.3.8	5	10.64%
8.0.1	1	2.13%
8.9.2	1	2.13%
8.3.6	1	2.13%
6.1.0	1	2.13%
7.4.5	1	2.13%
9.0.3	1	2.13%
8.5.0	1	2.13%
4.2.1	1	2.13%
7.6.0	1	2.13%
7.4.4	1	2.13%
6.0.8	1	2.13%
5.8.2	1	2.13%
Other	0	0.00%
Kerio (44 servers)
Version	Number of Servers	Percent
6.7.3	9	20.45%
6.6.1	6	13.64%
6.7.0	6	13.64%
6.7.1	5	11.36%
6.6.2	4	9.09%
6.5.2	4	9.09%
5.7.9	2	4.55%
6.5.1	2	4.55%
6.4.1	1	2.27%
6.0.10	1	2.27%
6.0.8	1	2.27%
6.5.0	1	2.27%
6.7.2	1	2.27%
6.3.0	1	2.27%
Other	0	0.00%
Post.Office (41 servers)
Version	Number of Servers	Percent
4.4	21	51.22%
4.2.2	9	21.95%
4.3	3	7.32%
3.5.3	3	7.32%
3.9.2	2	4.88%
4.2	1	2.44%
4.1.2.4	1	2.44%
3.1.2	1	2.44%
Other	0	0.00%
ArGoSoft (23 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	7	30.43%
1.8 (1.8.9.5)	3	13.04%
1.8 (1.8.8.8)	2	8.70%
1.8 (1.8.9.3)	2	8.70%
1.8 (1.8.8.7)	2	8.70%
1.8 (1.8.9.2)	2	8.70%
1.8 (1.8.9.1)	2	8.70%
1.8 (1.8.6.1)	1	4.35%
1.8 (1.8.6.0)	1	4.35%
1.8 (1.8.9.4)	1	4.35%
Other	0	0.00%
GroupWise (18 servers)
Version	Number of Servers	Percent
24.2.0	4	22.22%
18.3.1	3	16.67%
18.5.0	2	11.11%
7.0.4	1	5.56%
14.2.1	1	5.56%
18.1.1	1	5.56%
14.2.3	1	5.56%
6.5.0	1	5.56%
18.4.1	1	5.56%
23.4.0	1	5.56%
14.2.2	1	5.56%
18.0.2	1	5.56%
Other	0	0.00%
OpenVMS (6 servers)
Version	Number of Servers	Percent
8.4	3	50.00%
7.3	2	33.33%
8.2	1	16.67%
Other	0	0.00%
Gordano Messaging Suite (GMS) (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 (2 servers)
Version	Number of Servers	Percent
5.18	2	100.00%
Other	0	0.00%
ModusMail (1 servers)
Version	Number of Servers	Percent
4.1.361.21	1	100.00%
Other	0	0.00%
Mercury (1 servers)
Version	Number of Servers	Percent
1.48	1	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 (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%