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	935,799	100.0%
Number of Servers that didn't respond	149,635	15.99%
Server didn't open socket	147,161	15.73%
Server didn't provide banner	2,474	0.26%
Server provided banner	786,164	84.01%
Server banner identifies software in use	514,947	55.03%

As indicated by the above table, of the 935,799 servers queried, only 514,947 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	306,492	59.52%
Postfix	172,824	33.56%
Sendmail	18,259	3.55%
MailEnable	10,278	2.00%
MDaemon	2,573	0.50%
Microsoft	1,364	0.26%
CommuniGate Pro	622	0.12%
IMail	502	0.10%
Qmail Toaster	427	0.08%
XMail	350	0.07%
SurgeSMTP	283	0.05%
OpenSMTPD	271	0.05%
Lotus Domino	148	0.03%
WinWebMail	128	0.02%
MagicMail	120	0.02%
Kerio	72	0.01%
Merak	65	0.01%
Post.Office	58	0.01%
ArGoSoft	37	0.01%
GroupWise	29	0.01%
Gordano Messaging Suite (GMS)	14	0.00%
Trend Micro	9	0.00%
OpenVMS	8	0.00%
VisNetic	5	0.00%
ModusMail	2	0.00%
WebSTAR V	2	0.00%
Interscan	1	0.00%
Mercury	1	0.00%
MessageWall	1	0.00%
WebSTAR	1	0.00%
Mirapoint	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (306,492 servers)
Version	Number of Servers	Percent
4.94.2	234,960	76.66%
4.93	24,346	7.94%
4.94	7,327	2.39%
4.92	5,908	1.93%
4.95	5,906	1.93%
4.91	4,497	1.47%
4.92.3	3,417	1.11%
4.89	3,272	1.07%
Other	16,859	5.50%
Postfix (172,824 servers)
Version	Number of Servers	Percent
Other	172,824	100.00%
Sendmail (18,259 servers)
Version	Number of Servers	Percent
8.15.2	9,618	52.68%
8.14.4	2,397	13.13%
8.14.7	2,020	11.06%
8.13.8	1,096	6.00%
8.14.5	920	5.04%
8.16.1	502	2.75%
8.14.9	355	1.94%
8.13.1	324	1.77%
8.14.3	189	1.04%
Other	838	4.59%
MailEnable (10,278 servers)
Version	Number of Servers	Percent
10.34--	3,853	37.49%
10.27--	836	8.13%
10.25--	577	5.61%
9.00--	281	2.73%
10.31--	166	1.62%
10.37--	163	1.59%
10.31-10.31-	160	1.56%
10.37--10.37	128	1.25%
10.37-10.37-	122	1.19%
10.29--	117	1.14%
9.16--	113	1.10%
9.00--9.00	109	1.06%
Other	3,653	35.54%
MDaemon (2,573 servers)
Version	Number of Servers	Percent
21.0.3	347	13.49%
13.5.1	171	6.65%
21.0.2	114	4.43%
13.0.5	105	4.08%
19.5.5	91	3.54%
11.0.0	90	3.50%
11.0.3	85	3.30%
19.5.4	83	3.23%
13.0.4	82	3.19%
21.5.0	81	3.15%
16.5.2	77	2.99%
21.0.1	75	2.91%
14.5.2	54	2.10%
12.5.6	53	2.06%
20.0.4	40	1.55%
12.5.4	30	1.17%
10.0.0	30	1.17%
10.1.2	27	1.05%
20.0.3	26	1.01%
Other	912	35.45%
Microsoft (1,364 servers)
Version	Number of Servers	Percent
6.0.3790.4675	451	33.06%
8.5.9600.16384	233	17.08%
7.5.7601.17514	124	9.09%
10.0.14393.4169	114	8.36%
10.0.17763.1697	96	7.04%
6.0.3790.3959	73	5.35%
5.0.2195.5329	56	4.11%
8.0.9200.16384	36	2.64%
5.0.2195.6713	23	1.69%
10.0.14393.2608	19	1.39%
6.0.3790.1830	19	1.39%
10.0.17763.1	18	1.32%
7.0.6002.18264	15	1.10%
10.0.14393.0	14	1.03%
Other	73	5.35%
CommuniGate Pro (622 servers)
Version	Number of Servers	Percent
6.2.15	75	12.06%
6.2.14	71	11.41%
6.1.20	33	5.31%
6.2.12	19	3.05%
6.1.16	16	2.57%
5.4.11	15	2.41%
5.2.20	15	2.41%
6.1.18	14	2.25%
6.0.11	13	2.09%
6.3.6	13	2.09%
6.0.9	13	2.09%
6.3.8	11	1.77%
6.3.5	9	1.45%
6.3.3	8	1.29%
6.1.19	8	1.29%
5.2.3	8	1.29%
5.1.16	8	1.29%
6.3.7	7	1.13%
6.2.16	7	1.13%
Other	259	41.64%
IMail (502 servers)
Version	Number of Servers	Percent
12.5.8.41	95	18.92%
12.5.7.59	60	11.95%
12.5.6.101	46	9.16%
12.4.1.15	29	5.78%
9.23	28	5.58%
8.22	23	4.58%
12.5.3.93	22	4.38%
12.5.6.105	19	3.78%
8.15	19	3.78%
12.3.0.100	18	3.59%
12.5.5.115	17	3.39%
8.05	17	3.39%
10.02	15	2.99%
12.5.4.146	9	1.79%
12.5.5.117	9	1.79%
11.5	8	1.59%
Other	68	13.55%
Qmail Toaster (427 servers)
Version	Number of Servers	Percent
1.3	320	74.94%
1.03	98	22.95%
1.03.5	6	1.41%
Other	3	0.70%
XMail (350 servers)
Version	Number of Servers	Percent
1.27	188	53.71%
1.22	106	30.29%
1.25	18	5.14%
1.26	15	4.29%
1.24	6	1.71%
1.15	5	1.43%
Other	12	3.43%
SurgeSMTP (283 servers)
Version	Number of Servers	Percent
7.3o4-4	39	13.78%
7.5c-1	36	12.72%
7.5a-1	24	8.48%
7.4o-1	19	6.71%
7.3e2-2	19	6.71%
7.6d-1	14	4.95%
7.1e-1	12	4.24%
7.6h-2	9	3.18%
6.5a2-2	8	2.83%
7.4e-1	8	2.83%
7.3i2-2	6	2.12%
7.2i-1	6	2.12%
7.6h-1	5	1.77%
6.9c-1	4	1.41%
6.7c-1	4	1.41%
7.2a-1	4	1.41%
7.5d-7	4	1.41%
3.9e-1	4	1.41%
7.4m-1	3	1.06%
7.4a-1	3	1.06%
4.0u4-4	3	1.06%
7.6e-13	3	1.06%
6.5a-1	3	1.06%
Other	43	15.19%
OpenSMTPD (271 servers)
Version	Number of Servers	Percent
Other	271	100.00%
Lotus Domino (148 servers)
Version	Number of Servers	Percent
8.5.3FP6	28	18.92%
8.5.3	27	18.24%
8.5.1	10	6.76%
7.0	7	4.73%
8.5.2FP2	6	4.05%
8.5.2	5	3.38%
8.5	5	3.38%
7.0.3	5	3.38%
7.0.2	5	3.38%
8.5.3FP1	4	2.70%
8.5.2FP4HF759	3	2.03%
6.5.1	3	2.03%
8.5.1FP5	3	2.03%
5.0.8	3	2.03%
8.0.1	3	2.03%
6.5	2	1.35%
8.5.2FP1	2	1.35%
8.5.3FP4	2	1.35%
8.5.1FP4	2	1.35%
8.5.2FP4	2	1.35%
6.5.5	2	1.35%
8.5.3FP3	2	1.35%
8.5.2FP3	2	1.35%
7.0.4	2	1.35%
Other	13	8.78%
WinWebMail (128 servers)
Version	Number of Servers	Percent
3.9.0.7	24	18.75%
4.2.0.1	23	17.97%
3.8.1.3	11	8.59%
4.3.0.1	11	8.59%
4.4.0.1	8	6.25%
3.8.0.1	8	6.25%
3.8.6.1	6	4.69%
3.7.3.1	4	3.12%
4.0.0.1	4	3.12%
1.0	3	2.34%
3.9.0.1	3	2.34%
3.7.6.1	3	2.34%
3.8.3.1	2	1.56%
3.8.5.1	2	1.56%
3.9.5.3	2	1.56%
4.1.0.1	2	1.56%
3.8.1.1	2	1.56%
3.7.0.3	2	1.56%
3.7.5.1	2	1.56%
Other	6	4.69%
MagicMail (120 servers)
Version	Number of Servers	Percent
Other	120	100.00%
Kerio (72 servers)
Version	Number of Servers	Percent
6.7.3	16	22.22%
6.6.2	9	12.50%
6.6.1	8	11.11%
6.7.0	7	9.72%
6.5.0	6	8.33%
6.7.2	5	6.94%
6.7.1	4	5.56%
6.5.2	4	5.56%
6.4.1	2	2.78%
6.3.0	2	2.78%
5.7.6	2	2.78%
6.5.1	2	2.78%
6.3.1	1	1.39%
6.0.10	1	1.39%
5.7.9	1	1.39%
6.0.8	1	1.39%
6.6.0	1	1.39%
Other	0	0.00%
Merak (65 servers)
Version	Number of Servers	Percent
8.9.1	19	29.23%
8.0.3	16	24.62%
7.6.1	7	10.77%
8.3.8	4	6.15%
7.4.5	3	4.62%
7.6.0	2	3.08%
8.0.1	1	1.54%
8.9.2	1	1.54%
8.3.6	1	1.54%
6.1.0	1	1.54%
8.5.0	1	1.54%
8.3.0	1	1.54%
4.2.1	1	1.54%
5.8.2	1	1.54%
8.9.7	1	1.54%
7.4.4	1	1.54%
9.0.3	1	1.54%
7.0.1	1	1.54%
8.9.0	1	1.54%
6.0.3	1	1.54%
Other	0	0.00%
Post.Office (58 servers)
Version	Number of Servers	Percent
4.4	18	31.03%
4.3	14	24.14%
4.2.2	10	17.24%
3.5.3	5	8.62%
4.1.2.4	3	5.17%
4.2.1.1	2	3.45%
3.9.2	1	1.72%
3.5.3J	1	1.72%
3.5.1	1	1.72%
4.1.0.3	1	1.72%
4.1	1	1.72%
3.1.2	1	1.72%
Other	0	0.00%
ArGoSoft (37 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	9	24.32%
1.8 (1.8.9.5)	5	13.51%
1.8 (1.8.9.3)	4	10.81%
1.8 (1.8.8.8)	2	5.41%
1.8 (1.8.8.9)	2	5.41%
1.8 (1.8.9.1)	2	5.41%
1.8 (1.8.8.7)	2	5.41%
1.8 (1.8.9.2)	2	5.41%
1.8 (1.8.2.1)	2	5.41%
1.8 (1.8.6.1)	1	2.70%
1.8 (1.8.7.6)	1	2.70%
1.8 (1.8.7.3)	1	2.70%
1.8 (1.8.5.8)	1	2.70%
1.8 (1.8.8.4)	1	2.70%
1.8 (1.8.9.4)	1	2.70%
1.8 (1.8.2.5)	1	2.70%
Other	0	0.00%
GroupWise (29 servers)
Version	Number of Servers	Percent
18.3.1	5	17.24%
18.1.1	4	13.79%
18.2.0	4	13.79%
18.2.1	4	13.79%
14.2.1	2	6.90%
6.5.7	1	3.45%
18.3.0	1	3.45%
14.0.0	1	3.45%
18.0.0	1	3.45%
14.2.3	1	3.45%
8.0.3	1	3.45%
7.0.1	1	3.45%
14.2.0	1	3.45%
14.2.2	1	3.45%
7.0.2	1	3.45%
Other	0	0.00%
Gordano Messaging Suite (GMS) (14 servers)
Version	Number of Servers	Percent
Other	14	100.00%
Trend Micro (9 servers)
Version	Number of Servers	Percent
5.18	4	44.44%
5.5	2	22.22%
5.7	1	11.11%
7.5ready	1	11.11%
7.1	1	11.11%
Other	0	0.00%
OpenVMS (8 servers)
Version	Number of Servers	Percent
8.4	5	62.50%
7.3	3	37.50%
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%
ModusMail (2 servers)
Version	Number of Servers	Percent
4.1.361.21	2	100.00%
Other	0	0.00%
WebSTAR V (2 servers)
Version	Number of Servers	Percent
5.4.1	1	50.00%
5.3.2	1	50.00%
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%
MessageWall (1 servers)
Version	Number of Servers	Percent
1.0.8	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%