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	857,797	100.0%
Number of Servers that didn't respond	127,406	14.85%
Server didn't open socket	125,186	14.59%
Server didn't provide banner	2,220	0.26%
Server provided banner	730,391	85.15%
Server banner identifies software in use	483,818	56.40%

As indicated by the above table, of the 857,797 servers queried, only 483,818 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	291,497	60.25%
Postfix	158,999	32.86%
Sendmail	17,252	3.57%
MailEnable	9,572	1.98%
MDaemon	2,391	0.49%
Microsoft	1,203	0.25%
CommuniGate Pro	586	0.12%
IMail	435	0.09%
Qmail Toaster	414	0.09%
XMail	348	0.07%
OpenSMTPD	262	0.05%
SurgeSMTP	246	0.05%
Lotus Domino	125	0.03%
MagicMail	104	0.02%
WinWebMail	94	0.02%
Merak	69	0.01%
Post.Office	59	0.01%
Kerio	57	0.01%
ArGoSoft	34	0.01%
GroupWise	30	0.01%
Gordano Messaging Suite (GMS)	16	0.00%
Trend Micro	7	0.00%
OpenVMS	6	0.00%
VisNetic	4	0.00%
ModusMail	2	0.00%
Interscan	1	0.00%
Mercury	1	0.00%
Neon Mail Server	1	0.00%
WebSTAR	1	0.00%
Mirapoint	1	0.00%
InterScan VirusWall	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (291,497 servers)
Version	Number of Servers	Percent
4.94.2	216,628	74.32%
4.93	32,746	11.23%
4.94	7,759	2.66%
4.92	5,675	1.95%
4.91	4,282	1.47%
4.92.3	3,383	1.16%
4.89	3,157	1.08%
Other	17,867	6.13%
Postfix (158,999 servers)
Version	Number of Servers	Percent
Other	158,999	100.00%
Sendmail (17,252 servers)
Version	Number of Servers	Percent
8.15.2	9,392	54.44%
8.14.4	2,170	12.58%
8.14.7	1,756	10.18%
8.13.8	1,021	5.92%
8.14.5	917	5.32%
8.16.1	469	2.72%
8.14.9	343	1.99%
8.13.1	276	1.60%
8.14.3	193	1.12%
Other	715	4.14%
MailEnable (9,572 servers)
Version	Number of Servers	Percent
10.34--	3,514	36.71%
10.27--	901	9.41%
10.25--	550	5.75%
9.00--	263	2.75%
10.31--	173	1.81%
10.31-10.31-	149	1.56%
9.16--	109	1.14%
10.35--	108	1.13%
10.29--	105	1.10%
9.00--9.00	103	1.08%
10.30--	98	1.02%
Other	3,499	36.55%
MDaemon (2,391 servers)
Version	Number of Servers	Percent
21.0.3	329	13.76%
13.5.1	160	6.69%
21.0.2	131	5.48%
13.0.5	103	4.31%
11.0.0	92	3.85%
13.0.4	88	3.68%
11.0.3	85	3.55%
19.5.5	83	3.47%
21.0.1	70	2.93%
16.5.2	61	2.55%
12.5.6	57	2.38%
19.5.4	52	2.17%
14.5.2	46	1.92%
20.0.4	39	1.63%
12.5.4	32	1.34%
10.0.0	29	1.21%
20.0.3	27	1.13%
15.0.3	27	1.13%
10.1.2	26	1.09%
Other	854	35.72%
Microsoft (1,203 servers)
Version	Number of Servers	Percent
6.0.3790.4675	403	33.50%
8.5.9600.16384	197	16.38%
7.5.7601.17514	109	9.06%
10.0.14393.4169	107	8.89%
10.0.17763.1697	81	6.73%
6.0.3790.3959	64	5.32%
5.0.2195.5329	57	4.74%
8.0.9200.16384	27	2.24%
10.0.14393.2608	23	1.91%
5.0.2195.6713	22	1.83%
6.0.3790.1830	15	1.25%
10.0.17763.1	14	1.16%
Other	84	6.98%
CommuniGate Pro (586 servers)
Version	Number of Servers	Percent
6.2.15	83	14.16%
6.2.14	62	10.58%
6.2.12	20	3.41%
6.1.20	20	3.41%
5.4.11	17	2.90%
6.0.11	17	2.90%
6.3.6	16	2.73%
6.1.16	16	2.73%
6.1.18	15	2.56%
5.2.20	15	2.56%
6.3.5	11	1.88%
6.0.9	10	1.71%
6.3.3	9	1.54%
6.2.16	8	1.37%
5.1.16	8	1.37%
6.2.10	8	1.37%
6.3.8	8	1.37%
4.2.10	7	1.19%
6.1.19	7	1.19%
6.2.13	6	1.02%
6.0.7	6	1.02%
5.2.3	6	1.02%
6.2.7	6	1.02%
6.3.4	6	1.02%
Other	199	33.96%
IMail (435 servers)
Version	Number of Servers	Percent
12.5.8.41	82	18.85%
12.5.7.59	46	10.57%
12.5.6.101	45	10.34%
12.4.1.15	38	8.74%
9.23	24	5.52%
8.05	20	4.60%
8.22	19	4.37%
12.5.6.105	19	4.37%
12.5.3.93	17	3.91%
8.15	17	3.91%
12.3.0.100	17	3.91%
12.5.5.115	14	3.22%
12.5.5.117	10	2.30%
12.5.4.146	9	2.07%
10.02	9	2.07%
Other	49	11.26%
Qmail Toaster (414 servers)
Version	Number of Servers	Percent
1.3	313	75.60%
1.03	90	21.74%
1.03.5	6	1.45%
Other	5	1.21%
XMail (348 servers)
Version	Number of Servers	Percent
1.27	183	52.59%
1.22	114	32.76%
1.25	14	4.02%
1.26	12	3.45%
1.24	10	2.87%
1.15	4	1.15%
Other	11	3.16%
OpenSMTPD (262 servers)
Version	Number of Servers	Percent
Other	262	100.00%
SurgeSMTP (246 servers)
Version	Number of Servers	Percent
7.5c-1	41	16.67%
7.3o4-4	31	12.60%
7.5a-1	21	8.54%
7.6d-1	18	7.32%
7.4o-1	15	6.10%
7.3e2-2	15	6.10%
7.1e-1	12	4.88%
7.4e-1	8	3.25%
6.5a2-2	6	2.44%
7.3i2-2	5	2.03%
6.7c-1	5	2.03%
6.9c-1	4	1.63%
7.2a-1	4	1.63%
3.9e-1	4	1.63%
Other	57	23.17%
Lotus Domino (125 servers)
Version	Number of Servers	Percent
8.5.3	30	24.00%
8.5.3FP6	21	16.80%
7.0	8	6.40%
7.0.3	6	4.80%
8.5.2	5	4.00%
8.5.2FP2	5	4.00%
8.5.1	4	3.20%
7.0.2	4	3.20%
8.5.3FP1	3	2.40%
5.0.8	3	2.40%
8.5.2FP3	3	2.40%
8.0.1	3	2.40%
6.5	2	1.60%
8.5.3FP5	2	1.60%
8.5.2FP1	2	1.60%
8.0	2	1.60%
6.5.1	2	1.60%
8.5.2FP4	2	1.60%
7.5.1	2	1.60%
Other	16	12.80%
MagicMail (104 servers)
Version	Number of Servers	Percent
Other	104	100.00%
WinWebMail (94 servers)
Version	Number of Servers	Percent
4.2.0.1	20	21.28%
3.9.0.7	18	19.15%
4.3.0.1	9	9.57%
3.8.1.3	6	6.38%
3.7.3.1	4	4.26%
4.4.0.1	4	4.26%
3.8.0.1	4	4.26%
3.8.6.1	4	4.26%
4.1.0.1	3	3.19%
1.0	3	3.19%
3.7.6.1	3	3.19%
3.8.5.1	2	2.13%
3.7.0.3	2	2.13%
3.7.5.1	2	2.13%
3.8.3.1	1	1.06%
3.9.1.1	1	1.06%
3.7.6.2	1	1.06%
3.9.0.1	1	1.06%
3.9.5.3	1	1.06%
3.8.1.5	1	1.06%
3.8.1.1	1	1.06%
3.9.2.2	1	1.06%
4.0.0.1	1	1.06%
3.8.1.6	1	1.06%
Other	0	0.00%
Merak (69 servers)
Version	Number of Servers	Percent
8.9.1	18	26.09%
8.0.3	18	26.09%
7.6.1	8	11.59%
8.3.8	4	5.80%
7.4.5	3	4.35%
9.0.3	3	4.35%
8.5.0	2	2.90%
7.6.0	2	2.90%
8.0.1	1	1.45%
8.9.2	1	1.45%
8.3.6	1	1.45%
6.1.0	1	1.45%
4.2.1	1	1.45%
5.8.2	1	1.45%
8.9.7	1	1.45%
7.4.4	1	1.45%
6.0.8	1	1.45%
7.0.1	1	1.45%
8.9.0	1	1.45%
Other	0	0.00%
Post.Office (59 servers)
Version	Number of Servers	Percent
4.4	19	32.20%
4.3	13	22.03%
4.2.2	11	18.64%
4.1.2.4	4	6.78%
3.5.3	3	5.08%
3.9.2	2	3.39%
4.2.1.1	2	3.39%
4.1.1	1	1.69%
3.5.3J	1	1.69%
4.1.0.3	1	1.69%
4.1	1	1.69%
3.1.2	1	1.69%
Other	0	0.00%
Kerio (57 servers)
Version	Number of Servers	Percent
6.7.3	17	29.82%
6.7.0	7	12.28%
6.6.1	6	10.53%
6.6.2	5	8.77%
6.5.0	5	8.77%
6.5.2	4	7.02%
6.7.1	3	5.26%
6.7.2	3	5.26%
6.5.1	2	3.51%
5.7.9	1	1.75%
6.3.1	1	1.75%
6.0.8	1	1.75%
6.6.0	1	1.75%
6.4.1	1	1.75%
Other	0	0.00%
ArGoSoft (34 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	7	20.59%
1.8 (1.8.9.3)	6	17.65%
1.8 (1.8.9.5)	5	14.71%
1.8 (1.8.8.8)	2	5.88%
1.8 (1.8.8.7)	2	5.88%
1.8 (1.8.9.1)	2	5.88%
1.8 (1.8.6.1)	1	2.94%
1.8 (1.8.7.3)	1	2.94%
1.8 (1.8.8.9)	1	2.94%
1.8 (1.8.5.8)	1	2.94%
1.8 (1.8.8.4)	1	2.94%
1.8 (1.8.9.4)	1	2.94%
1.8 (1.8.9.2)	1	2.94%
1.8 (1.8.1.7)	1	2.94%
1.8 (1.8.2.1)	1	2.94%
1.8 (1.8.2.5)	1	2.94%
Other	0	0.00%
GroupWise (30 servers)
Version	Number of Servers	Percent
18.1.1	5	16.67%
18.2.0	4	13.33%
18.3.1	4	13.33%
18.1.0	3	10.00%
18.2.1	2	6.67%
14.2.2	2	6.67%
6.5.7	1	3.33%
18.0.0	1	3.33%
14.2.3	1	3.33%
6.5.0	1	3.33%
8.0.3	1	3.33%
14.2.1	1	3.33%
14.2.0	1	3.33%
14.0.0	1	3.33%
18.0.2	1	3.33%
7.0.2	1	3.33%
Other	0	0.00%
Gordano Messaging Suite (GMS) (16 servers)
Version	Number of Servers	Percent
Other	16	100.00%
Trend Micro (7 servers)
Version	Number of Servers	Percent
5.7	3	42.86%
5.18	3	42.86%
7.5ready	1	14.29%
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%
VisNetic (4 servers)
Version	Number of Servers	Percent
9.3.2.0	2	50.00%
8.0.3	1	25.00%
5.0.1	1	25.00%
Other	0	0.00%
ModusMail (2 servers)
Version	Number of Servers	Percent
4.1.361.21	2	100.00%
Other	0	0.00%
Interscan (1 servers)
Version	Number of Servers	Percent
3.8-Build_3013	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%
InterScan VirusWall (1 servers)
Version	Number of Servers	Percent
Other	1	100.00%