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	1,911,162	100.0%
Number of Servers that didn't respond	335,643	17.56%
Server didn't open socket	326,536	17.09%
Server didn't provide banner	9,107	0.48%
Server provided banner	1,575,519	82.44%
Server banner identifies software in use	974,933	51.01%

As indicated by the above table, of the 1,911,162 servers queried, only 974,933 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	554,937	56.92%
Postfix	329,879	33.84%
Sendmail	42,234	4.33%
MailEnable	21,688	2.22%
MDaemon	10,120	1.04%
Microsoft	7,479	0.77%
IMail	1,863	0.19%
CommuniGate Pro	1,566	0.16%
XMail	947	0.10%
Lotus Domino	768	0.08%
WinWebMail	735	0.08%
SurgeSMTP	550	0.06%
Qmail Toaster	458	0.05%
Kerio	371	0.04%
OpenSMTPD	330	0.03%
Merak	239	0.02%
ArGoSoft	168	0.02%
MagicMail	158	0.02%
Post.Office	141	0.01%
Gordano Messaging Suite (GMS)	73	0.01%
GroupWise	73	0.01%
Trend Micro	62	0.01%
InterScan VirusWall	24	0.00%
VisNetic	21	0.00%
OpenVMS	12	0.00%
Mirapoint	8	0.00%
Mercury	7	0.00%
Interscan	6	0.00%
Neon Mail Server	5	0.00%
WebSTAR V	5	0.00%
MessageWall	3	0.00%
WebSTAR	2	0.00%
ModusMail	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (554,937 servers)
Version	Number of Servers	Percent
4.89	415,021	74.79%
4.87	44,141	7.95%
4.90	26,959	4.86%
4.84	16,401	2.96%
4.80	6,887	1.24%
4.86	6,274	1.13%
4.85	5,575	1.00%
Other	33,679	6.07%
Postfix (329,879 servers)
Version	Number of Servers	Percent
Other	329,879	100.00%
Sendmail (42,234 servers)
Version	Number of Servers	Percent
8.14.5	11,735	27.79%
8.14.4	9,657	22.87%
8.13.8	6,078	14.39%
8.13.1	3,819	9.04%
8.15.2	2,865	6.78%
8.14.7	2,043	4.84%
8.14.3	1,560	3.69%
8.14.9	1,256	2.97%
Other	3,221	7.63%
MailEnable (21,688 servers)
Version	Number of Servers	Percent
9.00--	2,831	13.05%
9.16--	2,340	10.79%
8.60--	940	4.33%
8.53--	844	3.89%
6.5--	672	3.10%
8.51--	600	2.77%
8.04--	431	1.99%
1.986--	424	1.95%
8.60-8.60-	386	1.78%
9.75--	377	1.74%
8.50--	275	1.27%
5.10--	249	1.15%
10.11--	242	1.12%
8.00--	228	1.05%
9.74--	218	1.01%
Other	10,631	49.02%
MDaemon (10,120 servers)
Version	Number of Servers	Percent
17.5.2	1,236	12.21%
13.5.1	563	5.56%
16.5.2	517	5.11%
13.6.3	491	4.85%
13.0.4	410	4.05%
11.0.3	402	3.97%
11.0.0	396	3.91%
13.0.5	390	3.85%
17.5.1	320	3.16%
16.0.4	254	2.51%
17.0.2	231	2.28%
12.5.6	215	2.12%
12.5.4	204	2.02%
14.5.2	195	1.93%
15.0.3	182	1.80%
16.5.1	173	1.71%
10.1.2	156	1.54%
10.0.0	155	1.53%
16.0.1	121	1.20%
13.0.2	107	1.06%
10.1.1	106	1.05%
10.1.0	106	1.05%
15.5.3	105	1.04%
17.0.3	102	1.01%
Other	2,983	29.48%
Microsoft (7,479 servers)
Version	Number of Servers	Percent
6.0.3790.4675	4,165	55.69%
7.5.7601.17514	953	12.74%
8.5.9600.16384	755	10.09%
6.0.3790.3959	501	6.70%
8.0.9200.16384	184	2.46%
5.0.2195.5329	148	1.98%
7.0.6002.18264	131	1.75%
6.0.3790.1830	125	1.67%
10.0.14393.0	110	1.47%
Other	407	5.44%
IMail (1,863 servers)
Version	Number of Servers	Percent
12.5.5.115	210	11.27%
12.5.6.101	206	11.06%
8.22	202	10.84%
12.4.1.15	153	8.21%
9.23	122	6.55%
12.5.3.93	115	6.17%
12.5.4.146	101	5.42%
12.3.0.100	94	5.05%
8.15	84	4.51%
8.05	59	3.17%
11.03	54	2.90%
11.5	38	2.04%
12.5.5.117	28	1.50%
7.07	27	1.45%
12.5.1.60	26	1.40%
7.15	23	1.23%
10.02	22	1.18%
10.01	19	1.02%
Other	280	15.03%
CommuniGate Pro (1,566 servers)
Version	Number of Servers	Percent
6.1.16.	58	3.70%
6.2.1	48	3.07%
6.1.18.	46	2.94%
6.1.16	46	2.94%
6.1.18	40	2.55%
5.4.11	32	2.04%
5.3.13.	32	2.04%
6.1.10	31	1.98%
6.1.11	31	1.98%
6.0.11.	31	1.98%
6.2.1.	27	1.72%
5.4.11.	26	1.66%
6.0.11	25	1.60%
6.2.0	25	1.60%
5.2.20.	24	1.53%
6.2	24	1.53%
5.1.16.	24	1.53%
5.2.20	23	1.47%
6.2.0.	20	1.28%
5.1.16	20	1.28%
6.1.11.	20	1.28%
6.0.9	19	1.21%
6.0.9.	19	1.21%
5.0.14.	19	1.21%
6.1.19.	18	1.15%
5.2.3	18	1.15%
6.1.17	17	1.09%
6.1.2.	17	1.09%
6.1.15.	16	1.02%
Other	770	49.17%
XMail (947 servers)
Version	Number of Servers	Percent
1.27	422	44.56%
1.22	302	31.89%
1.26	66	6.97%
1.25	65	6.86%
1.24	34	3.59%
1.21	18	1.90%
1.23	11	1.16%
Other	29	3.06%
Lotus Domino (768 servers)
Version	Number of Servers	Percent
8.5.3FP6	149	19.40%
8.5.3	107	13.93%
8.5.2	35	4.56%
7.0.2	30	3.91%
8.5	26	3.39%
8.5.1	25	3.26%
8.5.3FP2	22	2.86%
8.5.3FP1	22	2.86%
8.5.3FP4	21	2.73%
7.0.3	18	2.34%
8.5.3FP3	17	2.21%
8.5.2FP4	16	2.08%
8.5.2FP3	15	1.95%
8.5.2FP2	14	1.82%
8.0.1	13	1.69%
8.5.1FP5	13	1.69%
7.0	12	1.56%
8.5.3FP5	12	1.56%
8.0	12	1.56%
6.5	10	1.30%
7.0.1	10	1.30%
7.0.4	9	1.17%
6.5.1	9	1.17%
6.5.4	8	1.04%
8.0.2	8	1.04%
7.0.3FP1	8	1.04%
Other	127	16.54%
WinWebMail (735 servers)
Version	Number of Servers	Percent
3.9.0.7	166	22.59%
3.8.1.3	100	13.61%
3.9.0.1	52	7.07%
3.8.0.1	43	5.85%
3.7.6.1	39	5.31%
3.8.1.5	31	4.22%
4.0.0.1	30	4.08%
3.9.5.3	26	3.54%
3.7.3.1	24	3.27%
3.8.5.1	23	3.13%
3.8.1.1	22	2.99%
3.9.3.1	21	2.86%
3.9.2.1	18	2.45%
3.8.6.1	17	2.31%
3.7.7.3	17	2.31%
3.9.5.1	17	2.31%
3.8.3.1	16	2.18%
3.8.2.1	11	1.50%
3.7.1.1	10	1.36%
3.7.5.1	8	1.09%
Other	44	5.99%
SurgeSMTP (550 servers)
Version	Number of Servers	Percent
7.3e2-2	164	29.82%
7.1e-1	59	10.73%
6.5a2-2	32	5.82%
7.2i-1	30	5.45%
7.2a-1	26	4.73%
6.7c-1	24	4.36%
7.3c3-3	18	3.27%
7.2e-2	17	3.09%
6.9c-1	17	3.09%
6.5a-1	17	3.09%
7.0c2-2	15	2.73%
3.9e-1	13	2.36%
5.2a-1	12	2.18%
7.3d-5	9	1.64%
6.1c-1	8	1.45%
6.4a-1	8	1.45%
4.0u4-4	8	1.45%
7.3f-16	7	1.27%
Other	66	12.00%
Qmail Toaster (458 servers)
Version	Number of Servers	Percent
1.3	346	75.55%
1.03	88	19.21%
1.2	9	1.97%
1.03.5	7	1.53%
1.03.6	5	1.09%
Other	3	0.66%
Kerio (371 servers)
Version	Number of Servers	Percent
6.7.3	72	19.41%
6.7.0	54	14.56%
6.5.2	39	10.51%
6.6.2	33	8.89%
6.7.2	30	8.09%
6.6.1	19	5.12%
6.5.0	18	4.85%
6.7.1	16	4.31%
6.4.1	15	4.04%
6.3.1	11	2.96%
6.4.0	9	2.43%
6.5.1	8	2.16%
6.3.0	7	1.89%
6.6.0	7	1.89%
6.1.3	5	1.35%
6.4.2	4	1.08%
5.7.9	4	1.08%
Other	20	5.39%
OpenSMTPD (330 servers)
Version	Number of Servers	Percent
Other	330	100.00%
Merak (239 servers)
Version	Number of Servers	Percent
8.0.3	70	29.29%
8.9.1	45	18.83%
8.5.0	17	7.11%
8.3.8	14	5.86%
7.5.2	12	5.02%
7.6.1	12	5.02%
7.4.5	11	4.60%
7.6.4	9	3.77%
9.0.3	5	2.09%
7.2.0	4	1.67%
7.4.2	3	1.26%
4.2.1	3	1.26%
7.6.0	3	1.26%
6.0.8	3	1.26%
Other	28	11.72%
ArGoSoft (168 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	58	34.52%
1.8 (1.8.9.3)	21	12.50%
1.8 (1.8.9.5)	20	11.90%
1.8 (1.8.9.1)	16	9.52%
1.8 (1.8.9.2)	6	3.57%
1.8 (1.8.7.3)	5	2.98%
1.8 (1.8.8.8)	5	2.98%
1.8 (1.8.8.7)	5	2.98%
1.8 (1.8.8.9)	4	2.38%
1.8 (1.8.9.4)	3	1.79%
1.8 (1.8.6.0)	3	1.79%
1.8 (1.8.7.6)	2	1.19%
1.8 (1.8.8.4)	2	1.19%
1.8 (1.8.5.8)	2	1.19%
1.8 (1.8.2.1)	2	1.19%
Other	14	8.33%
MagicMail (158 servers)
Version	Number of Servers	Percent
Other	158	100.00%
Post.Office (141 servers)
Version	Number of Servers	Percent
4.3	33	23.40%
4.2.2	27	19.15%
3.5.3	14	9.93%
4.1.2.4	14	9.93%
4.2.1.3	9	6.38%
3.9.2.3	5	3.55%
3.1.2	4	2.84%
4.1.1	3	2.13%
4.2.1.1	3	2.13%
3.5.1	3	2.13%
3.5.3J	3	2.13%
3.5.4	2	1.42%
4.1.0.3	2	1.42%
4.4	2	1.42%
3.8.7.4	2	1.42%
Other	15	10.64%
Gordano Messaging Suite (GMS) (73 servers)
Version	Number of Servers	Percent
Other	73	100.00%
GroupWise (73 servers)
Version	Number of Servers	Percent
14.2.2	20	27.40%
14.2.1	9	12.33%
6.5.7	8	10.96%
14.0.1	5	6.85%
18.0.0	5	6.85%
14.2.0	4	5.48%
7.0.3	3	4.11%
7.0.2	2	2.74%
18.0.1	2	2.74%
6.0.2	2	2.74%
6.0.4	2	2.74%
6.5.0	1	1.37%
6.0.3	1	1.37%
6.5.5	1	1.37%
7.0.1	1	1.37%
8.0.3	1	1.37%
8.0.1	1	1.37%
14.0.0	1	1.37%
14.0.2	1	1.37%
7.0.4	1	1.37%
12.0.2	1	1.37%
12.0.1	1	1.37%
Other	0	0.00%
Trend Micro (62 servers)
Version	Number of Servers	Percent
5.7	19	30.65%
5.18	12	19.35%
5.5	12	19.35%
7.0	8	12.90%
7.5	5	8.06%
3.53	2	3.23%
7.1	1	1.61%
8.5	1	1.61%
8	1	1.61%
9.0	1	1.61%
Other	0	0.00%
InterScan VirusWall (24 servers)
Version	Number of Servers	Percent
Other	24	100.00%
VisNetic (21 servers)
Version	Number of Servers	Percent
9.3.2.0	7	33.33%
5.8.6.6	2	9.52%
5.0.2.3	2	9.52%
6.2.2.0	1	4.76%
8.0.3	1	4.76%
9.1.4.0	1	4.76%
8.5.0.5	1	4.76%
7.6.1.0	1	4.76%
9.1.4.1	1	4.76%
5.5.8.3	1	4.76%
8.0.3.1	1	4.76%
5.0.2.0	1	4.76%
8.5.0.8	1	4.76%
Other	0	0.00%
OpenVMS (12 servers)
Version	Number of Servers	Percent
7.3	7	58.33%
8.4	4	33.33%
8.2	1	8.33%
Other	0	0.00%
Mirapoint (8 servers)
Version	Number of Servers	Percent
4.4.2a-FCS	2	25.00%
4.3.5-GA	2	25.00%
4.4.3-GA	2	25.00%
3.10.10a-GA	1	12.50%
4.4.3a-GA	1	12.50%
Other	0	0.00%
Mercury (7 servers)
Version	Number of Servers	Percent
3.32	4	57.14%
1.48	2	28.57%
3.21	1	14.29%
Other	0	0.00%
Interscan (6 servers)
Version	Number of Servers	Percent
3.81-Build_1022	2	33.33%
3.81-Build_1084	1	16.67%
3.8-Build_3013	1	16.67%
3.8-Build_1080	1	16.67%
3.5 (build 1294)	1	16.67%
Other	0	0.00%
Neon Mail Server (5 servers)
Version	Number of Servers	Percent
3.1.3	1	20.00%
3.0.7	1	20.00%
3.1.0	1	20.00%
3.1.5	1	20.00%
3.1.2	1	20.00%
Other	0	0.00%
WebSTAR V (5 servers)
Version	Number of Servers	Percent
5.4.1	3	60.00%
5.3.2	1	20.00%
5.3.4	1	20.00%
Other	0	0.00%
MessageWall (3 servers)
Version	Number of Servers	Percent
1.0.8	3	100.00%
Other	0	0.00%
WebSTAR (2 servers)
Version	Number of Servers	Percent
Other	2	100.00%
ModusMail (1 servers)
Version	Number of Servers	Percent
4.1.361.21	1	100.00%
Other	0	0.00%