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	773,395	100.0%
Number of Servers that didn't respond	121,492	15.71%
Server didn't open socket	119,763	15.49%
Server didn't provide banner	1,729	0.22%
Server provided banner	651,903	84.29%
Server banner identifies software in use	430,748	55.70%

As indicated by the above table, of the 773,395 servers queried, only 430,748 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	253,410	58.83%
Postfix	148,568	34.49%
Sendmail	15,577	3.62%
MailEnable	8,085	1.88%
MDaemon	1,888	0.44%
Microsoft	879	0.20%
CommuniGate Pro	505	0.12%
IMail	331	0.08%
XMail	304	0.07%
OpenSMTPD	293	0.07%
SurgeSMTP	228	0.05%
Qmail Toaster	167	0.04%
MagicMail	111	0.03%
WinWebMail	81	0.02%
Lotus Domino	81	0.02%
Merak	58	0.01%
Post.Office	48	0.01%
Kerio	47	0.01%
ArGoSoft	32	0.01%
GroupWise	24	0.01%
Gordano Messaging Suite (GMS)	10	0.00%
OpenVMS	5	0.00%
VisNetic	4	0.00%
Trend Micro	4	0.00%
ModusMail	2	0.00%
Interscan	1	0.00%
Mercury	1	0.00%
Neon Mail Server	1	0.00%
Mirapoint	1	0.00%
WebSTAR V	1	0.00%
InterScan VirusWall	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (253,410 servers)
Version	Number of Servers	Percent
4.95	174,969	69.05%
4.96	34,377	13.57%
4.94.2	12,748	5.03%
4.93	9,535	3.76%
4.92	3,587	1.42%
Other	18,194	7.18%
Postfix (148,568 servers)
Version	Number of Servers	Percent
Other	148,568	100.00%
Sendmail (15,577 servers)
Version	Number of Servers	Percent
8.15.2	5,563	35.71%
8.16.1	4,109	26.38%
8.14.7	1,756	11.27%
8.14.4	1,559	10.01%
8.13.8	722	4.64%
8.14.5	473	3.04%
8.17.1	272	1.75%
8.14.9	256	1.64%
8.13.1	195	1.25%
Other	672	4.31%
MailEnable (8,085 servers)
Version	Number of Servers	Percent
10.42--	2,213	27.37%
10.43--	1,191	14.73%
10.34--	631	7.80%
10.27--	335	4.14%
10.25--	285	3.53%
10.43-10.43-	253	3.13%
10.43--10.43	190	2.35%
9.00--	146	1.81%
10.31--	98	1.21%
9.00--9.00	89	1.10%
Other	2,654	32.83%
MDaemon (1,888 servers)
Version	Number of Servers	Percent
22.0.3	255	13.51%
21.5.2	121	6.41%
13.5.1	115	6.09%
23.0.0	81	4.29%
13.0.5	78	4.13%
11.0.3	65	3.44%
11.0.0	64	3.39%
13.0.4	62	3.28%
19.5.4	58	3.07%
22.0.2	57	3.02%
14.5.2	45	2.38%
16.5.2	45	2.38%
19.5.5	35	1.85%
12.5.6	30	1.59%
21.0.3	28	1.48%
10.0.0	23	1.22%
12.5.4	20	1.06%
21.0.1	19	1.01%
Other	687	36.39%
Microsoft (879 servers)
Version	Number of Servers	Percent
6.0.3790.4675	239	27.19%
8.5.9600.16384	142	16.15%
10.0.14393.4169	113	12.86%
10.0.17763.1697	93	10.58%
7.5.7601.17514	69	7.85%
6.0.3790.3959	44	5.01%
5.0.2195.5329	40	4.55%
8.0.9200.16384	26	2.96%
5.0.2195.6713	17	1.93%
7.0.6002.18264	12	1.37%
10.0.17763.1	9	1.02%
5.0.2195.7381	9	1.02%
Other	66	7.51%
CommuniGate Pro (505 servers)
Version	Number of Servers	Percent
6.2.14	51	10.10%
6.2.15	49	9.70%
6.3.17	25	4.95%
6.1.20	22	4.36%
6.1.18	14	2.77%
6.1.16	14	2.77%
5.4.11	13	2.57%
6.0.11	12	2.38%
6.0.9	12	2.38%
5.2.20	11	2.18%
6.3.14	10	1.98%
6.2.12	10	1.98%
6.3.16	10	1.98%
6.3.6	8	1.58%
6.3.15	7	1.39%
7.1.4	6	1.19%
6.3.5	6	1.19%
7.1.1	6	1.19%
6.3.9	6	1.19%
6.1.19	6	1.19%
6.3.13	6	1.19%
Other	201	39.80%
IMail (331 servers)
Version	Number of Servers	Percent
12.5.8.41	42	12.69%
12.5.7.59	30	9.06%
12.5.6.101	25	7.55%
9.23	21	6.34%
12.6.0.17	19	5.74%
12.5.8.58	17	5.14%
12.5.6.105	16	4.83%
12.4.1.15	14	4.23%
12.5.3.93	13	3.93%
12.5.8.59	13	3.93%
8.05	12	3.63%
8.22	11	3.32%
12.5.8.54	10	3.02%
8.15	10	3.02%
10.02	9	2.72%
12.3.0.100	9	2.72%
12.5.4.146	7	2.11%
12.5.5.117	6	1.81%
12.6.0.19	5	1.51%
12.5.5.115	4	1.21%
11.5	4	1.21%
Other	34	10.27%
XMail (304 servers)
Version	Number of Servers	Percent
1.27	184	60.53%
1.22	72	23.68%
1.25	14	4.61%
1.26	13	4.28%
1.24	8	2.63%
1.15	6	1.97%
Other	7	2.30%
OpenSMTPD (293 servers)
Version	Number of Servers	Percent
Other	293	100.00%
SurgeSMTP (228 servers)
Version	Number of Servers	Percent
7.6j-1	30	13.16%
7.6u-1	24	10.53%
7.3o4-4	19	8.33%
7.3e2-2	17	7.46%
7.5c-1	12	5.26%
7.6s-1	10	4.39%
7.5a-1	9	3.95%
7.6h-2	9	3.95%
7.1e-1	8	3.51%
7.4o-1	7	3.07%
7.6d-1	7	3.07%
7.7c-1	7	3.07%
6.5a2-2	5	2.19%
7.6m-1	5	2.19%
7.6q-1	4	1.75%
7.4e-1	4	1.75%
7.4m-1	3	1.32%
6.5a-1	3	1.32%
3.9e-1	3	1.32%
6.7c-1	3	1.32%
Other	39	17.11%
Qmail Toaster (167 servers)
Version	Number of Servers	Percent
1.03	89	53.29%
1.3	71	42.51%
1.03.5	6	3.59%
Other	1	0.60%
MagicMail (111 servers)
Version	Number of Servers	Percent
Other	111	100.00%
WinWebMail (81 servers)
Version	Number of Servers	Percent
4.4.0.1	15	18.52%
3.9.0.7	14	17.28%
4.2.0.1	14	17.28%
3.8.1.3	7	8.64%
4.3.0.1	5	6.17%
3.8.0.1	5	6.17%
3.7.3.1	3	3.70%
4.1.0.1	3	3.70%
3.8.6.1	3	3.70%
3.8.1.5	2	2.47%
3.9.2.1	2	2.47%
3.7.7.3	1	1.23%
3.8.3.1	1	1.23%
1.0	1	1.23%
3.7.6.1	1	1.23%
3.8.5.1	1	1.23%
3.8.1.6	1	1.23%
4.0.0.1	1	1.23%
3.7.5.1	1	1.23%
Other	0	0.00%
Lotus Domino (81 servers)
Version	Number of Servers	Percent
8.5.3	19	23.46%
8.5.3FP6	12	14.81%
7.0.3	5	6.17%
7.0	4	4.94%
6.5	3	3.70%
8.5.2FP1	3	3.70%
8.5.2FP2	3	3.70%
7.0.2	3	3.70%
8.5.3FP1	2	2.47%
6.5.1	2	2.47%
8.5.1	2	2.47%
8.5.2FP3	2	2.47%
7.5.1	2	2.47%
7.0.3FP1	2	2.47%
8.0	1	1.23%
6.5.4	1	1.23%
6.0.1	1	1.23%
8.5.3FP5	1	1.23%
8.5.2FP4	1	1.23%
5.0.8	1	1.23%
8.5.3FP3	1	1.23%
8.5.3FP4	1	1.23%
7.0.4FP1	1	1.23%
5.0.11	1	1.23%
8.5.1FP5	1	1.23%
8.0.1	1	1.23%
6.5.2	1	1.23%
6.5.4FP2	1	1.23%
7.0.4FP2	1	1.23%
8.5.1FP2	1	1.23%
6.5.3	1	1.23%
Other	0	0.00%
Merak (58 servers)
Version	Number of Servers	Percent
8.0.3	15	25.86%
8.9.1	14	24.14%
7.6.1	7	12.07%
8.3.8	5	8.62%
7.4.5	2	3.45%
8.0.1	1	1.72%
8.9.2	1	1.72%
8.3.6	1	1.72%
6.1.0	1	1.72%
8.5.0	1	1.72%
9.0.3	1	1.72%
7.6.4	1	1.72%
4.2.1	1	1.72%
8.9.7	1	1.72%
7.6.0	1	1.72%
7.4.4	1	1.72%
6.0.8	1	1.72%
7.0.1	1	1.72%
8.9.0	1	1.72%
5.8.2	1	1.72%
Other	0	0.00%
Post.Office (48 servers)
Version	Number of Servers	Percent
4.4	20	41.67%
4.3	8	16.67%
4.2.2	8	16.67%
3.5.3	4	8.33%
4.1.2.4	3	6.25%
4.2	2	4.17%
3.9.2	1	2.08%
4.1	1	2.08%
3.1.2	1	2.08%
Other	0	0.00%
Kerio (47 servers)
Version	Number of Servers	Percent
6.7.3	8	17.02%
6.7.0	7	14.89%
6.6.1	6	12.77%
6.6.2	6	12.77%
6.7.1	5	10.64%
6.5.2	4	8.51%
6.7.2	3	6.38%
5.7.9	2	4.26%
6.4.1	2	4.26%
6.5.1	2	4.26%
6.0.10	1	2.13%
6.0.8	1	2.13%
Other	0	0.00%
ArGoSoft (32 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	10	31.25%
1.8 (1.8.9.3)	4	12.50%
1.8 (1.8.9.5)	3	9.38%
1.8 (1.8.8.8)	2	6.25%
1.8 (1.8.7.3)	2	6.25%
1.8 (1.8.9.1)	2	6.25%
1.8 (1.8.8.7)	2	6.25%
1.8 (1.8.9.2)	2	6.25%
1.8 (1.8.6.1)	1	3.12%
1.8 (1.8.8.4)	1	3.12%
1.8 (1.8.1.7)	1	3.12%
1.8 (1.8.6.0)	1	3.12%
1.8 (1.8.9.4)	1	3.12%
Other	0	0.00%
GroupWise (24 servers)
Version	Number of Servers	Percent
18.3.1	4	16.67%
18.2.1	3	12.50%
18.1.1	2	8.33%
18.4.1	2	8.33%
18.4.2	2	8.33%
6.5.7	1	4.17%
14.2.1	1	4.17%
14.2.3	1	4.17%
18.0.0	1	4.17%
6.5.0	1	4.17%
8.0.3	1	4.17%
14.0.0	1	4.17%
18.2.0	1	4.17%
18.0.2	1	4.17%
14.2.2	1	4.17%
18.4.0	1	4.17%
Other	0	0.00%
Gordano Messaging Suite (GMS) (10 servers)
Version	Number of Servers	Percent
Other	10	100.00%
OpenVMS (5 servers)
Version	Number of Servers	Percent
8.4	3	60.00%
7.3	2	40.00%
Other	0	0.00%
VisNetic (4 servers)
Version	Number of Servers	Percent
9.3.2.0	3	75.00%
8.0.3	1	25.00%
Other	0	0.00%
Trend Micro (4 servers)
Version	Number of Servers	Percent
5.18	3	75.00%
5.5	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
3.0.7	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%
WebSTAR V (1 servers)
Version	Number of Servers	Percent
5.3.2	1	100.00%
Other	0	0.00%
InterScan VirusWall (1 servers)
Version	Number of Servers	Percent
Other	1	100.00%