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	804,432	100.0%
Number of Servers that didn't respond	123,912	15.40%
Server didn't open socket	120,105	14.93%
Server didn't provide banner	3,807	0.47%
Server provided banner	680,520	84.60%
Server banner identifies software in use	453,405	56.36%

As indicated by the above table, of the 804,432 servers queried, only 453,405 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	275,279	60.71%
Postfix	148,363	32.72%
Sendmail	15,704	3.46%
MailEnable	8,608	1.90%
MDaemon	1,896	0.42%
Microsoft	931	0.21%
CommuniGate Pro	539	0.12%
Qmail Toaster	455	0.10%
IMail	345	0.08%
XMail	312	0.07%
OpenSMTPD	263	0.06%
SurgeSMTP	219	0.05%
MagicMail	105	0.02%
Lotus Domino	91	0.02%
WinWebMail	63	0.01%
Merak	53	0.01%
Kerio	47	0.01%
Post.Office	45	0.01%
ArGoSoft	29	0.01%
GroupWise	25	0.01%
Gordano Messaging Suite (GMS)	11	0.00%
OpenVMS	6	0.00%
VisNetic	5	0.00%
Trend Micro	4	0.00%
ModusMail	2	0.00%
Neon Mail Server	2	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 (275,279 servers)
Version	Number of Servers	Percent
4.95	201,655	73.25%
4.94.2	19,722	7.16%
4.96	14,986	5.44%
4.93	14,057	5.11%
4.92	3,928	1.43%
4.94	3,012	1.09%
Other	17,919	6.51%
Postfix (148,363 servers)
Version	Number of Servers	Percent
Other	148,363	100.00%
Sendmail (15,704 servers)
Version	Number of Servers	Percent
8.15.2	5,987	38.12%
8.16.1	3,772	24.02%
8.14.7	1,721	10.96%
8.14.4	1,590	10.12%
8.13.8	786	5.01%
8.14.5	463	2.95%
8.14.9	242	1.54%
8.13.1	231	1.47%
8.17.1	224	1.43%
Other	688	4.38%
MailEnable (8,608 servers)
Version	Number of Servers	Percent
10.34--	3,847	44.69%
10.27--	416	4.83%
10.25--	340	3.95%
9.00--	192	2.23%
10.37--	161	1.87%
10.39--	130	1.51%
10.31-10.31-	114	1.32%
10.31--	111	1.29%
10.40--	98	1.14%
9.00--9.00	95	1.10%
10.42--10.42	89	1.03%
10.42--	89	1.03%
Other	2,926	33.99%
MDaemon (1,896 servers)
Version	Number of Servers	Percent
22.0.3	206	10.86%
21.5.2	134	7.07%
13.5.1	112	5.91%
22.0.2	80	4.22%
13.0.5	75	3.96%
13.0.4	73	3.85%
11.0.0	69	3.64%
11.0.3	67	3.53%
14.5.2	44	2.32%
16.5.2	42	2.22%
19.5.4	40	2.11%
19.5.5	37	1.95%
12.5.6	32	1.69%
21.0.3	31	1.64%
21.5.1	30	1.58%
22.0.0	28	1.48%
10.0.0	26	1.37%
21.0.1	21	1.11%
12.5.4	20	1.05%
21.0.2	20	1.05%
22.0.1	19	1.00%
Other	690	36.39%
Microsoft (931 servers)
Version	Number of Servers	Percent
6.0.3790.4675	281	30.18%
8.5.9600.16384	133	14.29%
10.0.14393.4169	115	12.35%
10.0.17763.1697	92	9.88%
7.5.7601.17514	69	7.41%
5.0.2195.5329	48	5.16%
6.0.3790.3959	43	4.62%
8.0.9200.16384	25	2.69%
5.0.2195.6713	16	1.72%
7.0.6002.18264	13	1.40%
10.0.14393.0	12	1.29%
10.0.17763.1	12	1.29%
Other	72	7.73%
CommuniGate Pro (539 servers)
Version	Number of Servers	Percent
6.2.15	65	12.06%
6.2.14	50	9.28%
6.1.20	22	4.08%
6.3.14	21	3.90%
6.3.15	21	3.90%
6.0.11	12	2.23%
6.0.9	12	2.23%
6.1.16	12	2.23%
6.3.13	12	2.23%
6.1.18	11	2.04%
5.4.11	10	1.86%
6.2.16	9	1.67%
5.2.20	9	1.67%
7.1.2	8	1.48%
6.2.12	8	1.48%
5.1.16	8	1.48%
6.3.6	8	1.48%
7.1.1	7	1.30%
6.3.9	6	1.11%
6.3.5	6	1.11%
6.3.11	6	1.11%
Other	216	40.07%
Qmail Toaster (455 servers)
Version	Number of Servers	Percent
1.3	371	81.54%
1.03	80	17.58%
Other	4	0.88%
IMail (345 servers)
Version	Number of Servers	Percent
12.5.8.41	44	12.75%
12.5.6.101	32	9.28%
12.5.7.59	26	7.54%
9.23	24	6.96%
12.5.8.58	19	5.51%
12.6.0.17	17	4.93%
12.4.1.15	17	4.93%
12.5.8.59	16	4.64%
12.5.6.105	14	4.06%
8.05	14	4.06%
8.22	12	3.48%
12.5.3.93	12	3.48%
8.15	11	3.19%
10.02	11	3.19%
12.5.8.54	10	2.90%
12.3.0.100	8	2.32%
12.5.4.146	5	1.45%
12.5.5.115	5	1.45%
12.5.5.117	5	1.45%
11.5	4	1.16%
Other	39	11.30%
XMail (312 servers)
Version	Number of Servers	Percent
1.27	182	58.33%
1.22	82	26.28%
1.26	13	4.17%
1.25	13	4.17%
1.24	9	2.88%
1.15	6	1.92%
Other	7	2.24%
OpenSMTPD (263 servers)
Version	Number of Servers	Percent
Other	263	100.00%
SurgeSMTP (219 servers)
Version	Number of Servers	Percent
7.6j-1	38	17.35%
7.3o4-4	25	11.42%
7.6s-1	18	8.22%
7.3e2-2	16	7.31%
7.5c-1	14	6.39%
7.5a-1	10	4.57%
7.1e-1	8	3.65%
7.4o-1	8	3.65%
7.6h-2	7	3.20%
7.4e-1	7	3.20%
6.7c-1	6	2.74%
6.5a2-2	6	2.74%
7.6d-1	6	2.74%
7.6m-1	6	2.74%
7.3i2-2	4	1.83%
3.9e-1	3	1.37%
Other	37	16.89%
MagicMail (105 servers)
Version	Number of Servers	Percent
Other	105	100.00%
Lotus Domino (91 servers)
Version	Number of Servers	Percent
8.5.3	17	18.68%
8.5.3FP6	13	14.29%
7.0	6	6.59%
8.5.1	5	5.49%
7.0.3	4	4.40%
8.5.2FP2	4	4.40%
7.0.2	3	3.30%
6.5	2	2.20%
8.5.2FP1	2	2.20%
8.5.3FP4	2	2.20%
8.0	2	2.20%
8.5.1FP5	2	2.20%
8.5.2	2	2.20%
8.5.2FP3	2	2.20%
8.0.1	2	2.20%
7.5.1	2	2.20%
6.5.3	2	2.20%
7.0.4FP2	2	2.20%
8.5.3FP2	1	1.10%
8.5.3FP1	1	1.10%
8.5.1FP4	1	1.10%
8.5.3FP6HF1215	1	1.10%
6.5.4	1	1.10%
6.5.1	1	1.10%
8.5.3FP5	1	1.10%
5.0.13a	1	1.10%
8.5.2FP4	1	1.10%
5.0.8	1	1.10%
7.0.4FP1	1	1.10%
5.0.11	1	1.10%
8.5.1FP3	1	1.10%
6.5.2	1	1.10%
7.0.3FP1	1	1.10%
6.5.4FP2	1	1.10%
8.5.3FP3	1	1.10%
Other	0	0.00%
WinWebMail (63 servers)
Version	Number of Servers	Percent
4.2.0.1	12	19.05%
3.9.0.7	11	17.46%
4.4.0.1	9	14.29%
3.7.3.1	4	6.35%
4.3.0.1	4	6.35%
3.8.6.1	4	6.35%
4.1.0.1	3	4.76%
3.8.1.3	3	4.76%
3.8.0.1	2	3.17%
3.8.1.5	2	3.17%
4.0.0.1	2	3.17%
1.0	1	1.59%
3.8.5.1	1	1.59%
3.9.3.1	1	1.59%
3.9.2.1	1	1.59%
3.7.6.1	1	1.59%
3.9.2.2	1	1.59%
3.7.5.1	1	1.59%
Other	0	0.00%
Merak (53 servers)
Version	Number of Servers	Percent
8.0.3	14	26.42%
8.9.1	13	24.53%
7.6.1	7	13.21%
8.3.8	3	5.66%
7.4.5	3	5.66%
9.0.3	2	3.77%
8.9.2	1	1.89%
8.3.6	1	1.89%
6.1.0	1	1.89%
8.5.0	1	1.89%
8.9.7	1	1.89%
7.6.0	1	1.89%
7.4.4	1	1.89%
6.0.8	1	1.89%
7.0.1	1	1.89%
8.9.0	1	1.89%
5.8.2	1	1.89%
Other	0	0.00%
Kerio (47 servers)
Version	Number of Servers	Percent
6.7.3	11	23.40%
6.6.1	6	12.77%
6.6.2	6	12.77%
6.7.0	5	10.64%
6.7.1	4	8.51%
6.5.2	4	8.51%
6.3.0	2	4.26%
6.7.2	2	4.26%
6.5.1	2	4.26%
6.0.10	1	2.13%
5.7.9	1	2.13%
6.3.1	1	2.13%
6.0.8	1	2.13%
6.5.0	1	2.13%
Other	0	0.00%
Post.Office (45 servers)
Version	Number of Servers	Percent
4.4	14	31.11%
4.3	9	20.00%
4.2.2	9	20.00%
4.1.2.4	3	6.67%
3.9.2	2	4.44%
3.5.3	2	4.44%
4.2	1	2.22%
4.1.1	1	2.22%
3.5.3J	1	2.22%
4.1	1	2.22%
3.1.2	1	2.22%
4.2.1.1	1	2.22%
Other	0	0.00%
ArGoSoft (29 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	8	27.59%
1.8 (1.8.9.3)	3	10.34%
1.8 (1.8.9.5)	3	10.34%
1.8 (1.8.8.8)	2	6.90%
1.8 (1.8.7.3)	2	6.90%
1.8 (1.8.9.1)	2	6.90%
1.8 (1.8.6.1)	1	3.45%
1.8 (1.8.1.7)	1	3.45%
1.8 (1.8.8.7)	1	3.45%
1.8 (1.8.8.4)	1	3.45%
1.8 (1.8.6.0)	1	3.45%
1.8 (1.8.9.4)	1	3.45%
1.8 (1.8.2.1)	1	3.45%
1.8 (1.8.9.2)	1	3.45%
1.8 (1.8.2.5)	1	3.45%
Other	0	0.00%
GroupWise (25 servers)
Version	Number of Servers	Percent
18.2.1	4	16.00%
18.4.0	4	16.00%
18.3.1	4	16.00%
18.1.1	2	8.00%
14.2.1	1	4.00%
14.2.3	1	4.00%
18.0.0	1	4.00%
6.5.0	1	4.00%
14.2.0	1	4.00%
8.0.3	1	4.00%
18.4.1	1	4.00%
14.2.2	1	4.00%
14.0.0	1	4.00%
18.2.0	1	4.00%
18.0.2	1	4.00%
Other	0	0.00%
Gordano Messaging Suite (GMS) (11 servers)
Version	Number of Servers	Percent
Other	11	100.00%
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%
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%
Trend Micro (4 servers)
Version	Number of Servers	Percent
5.7	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%
Neon Mail Server (2 servers)
Version	Number of Servers	Percent
3.0.7	1	50.00%
3.1.2	1	50.00%
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%