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	1,714,940	100.0%
Number of Servers that didn't respond	312,916	18.25%
Server didn't open socket	307,523	17.93%
Server didn't provide banner	5,393	0.31%
Server provided banner	1,402,024	81.75%
Server banner identifies software in use	870,248	50.75%

As indicated by the above table, of the 1,714,940 servers queried, only 870,248 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	495,149	56.90%
Postfix	304,381	34.98%
Sendmail	33,922	3.90%
MailEnable	18,460	2.12%
MDaemon	7,075	0.81%
Microsoft	4,419	0.51%
IMail	1,285	0.15%
CommuniGate Pro	1,229	0.14%
XMail	775	0.09%
Qmail Toaster	714	0.08%
SurgeSMTP	514	0.06%
Lotus Domino	493	0.06%
WinWebMail	448	0.05%
OpenSMTPD	372	0.04%
Kerio	235	0.03%
MagicMail	172	0.02%
Merak	144	0.02%
Post.Office	130	0.01%
ArGoSoft	100	0.01%
GroupWise	71	0.01%
Gordano Messaging Suite (GMS)	67	0.01%
Trend Micro	41	0.00%
OpenVMS	14	0.00%
VisNetic	10	0.00%
InterScan VirusWall	10	0.00%
Interscan	4	0.00%
Mercury	3	0.00%
WebSTAR V	3	0.00%
ModusMail	2	0.00%
MessageWall	2	0.00%
Mirapoint	2	0.00%
WebSTAR	1	0.00%
Neon Mail Server	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (495,149 servers)
Version	Number of Servers	Percent
4.92	365,286	73.77%
4.91	40,733	8.23%
4.92.3	23,436	4.73%
4.87	11,590	2.34%
4.89	9,391	1.90%
4.92.2	7,855	1.59%
4.84	7,725	1.56%
4.90	5,317	1.07%
Other	23,816	4.81%
Postfix (304,381 servers)
Version	Number of Servers	Percent
Other	304,381	100.00%
Sendmail (33,922 servers)
Version	Number of Servers	Percent
8.15.2	12,941	38.15%
8.14.4	6,414	18.91%
8.13.8	3,285	9.68%
8.14.7	2,877	8.48%
8.14.5	2,585	7.62%
8.13.1	2,122	6.26%
8.14.9	967	2.85%
8.14.3	658	1.94%
Other	2,073	6.11%
MailEnable (18,460 servers)
Version	Number of Servers	Percent
10.25--	6,322	34.25%
9.00--	1,047	5.67%
10.27--	579	3.14%
10.12--	502	2.72%
9.16--	366	1.98%
8.60--	345	1.87%
8.53--	257	1.39%
10.20--	255	1.38%
6.5--	252	1.37%
8.60-8.60-	240	1.30%
10.26--	231	1.25%
8.51--	207	1.12%
10.25--10.25	205	1.11%
10.25-10.25-	201	1.09%
9.00--9.00	193	1.05%
Other	7,258	39.32%
MDaemon (7,075 servers)
Version	Number of Servers	Percent
19.0.3	471	6.66%
13.5.1	449	6.35%
19.5.0	421	5.95%
13.6.3	393	5.55%
13.0.4	307	4.34%
13.0.5	276	3.90%
19.5.1	270	3.82%
11.0.3	260	3.67%
11.0.0	252	3.56%
16.5.2	219	3.10%
12.5.4	155	2.19%
12.5.6	151	2.13%
14.5.2	142	2.01%
18.5.3	108	1.53%
10.0.0	97	1.37%
18.5.1	94	1.33%
10.1.2	91	1.29%
16.0.4	88	1.24%
15.0.3	86	1.22%
18.5.2	84	1.19%
10.1.0	74	1.05%
18.0.2	74	1.05%
19.0.2	73	1.03%
Other	2,440	34.49%
Microsoft (4,419 servers)
Version	Number of Servers	Percent
6.0.3790.4675	1,978	44.76%
8.5.9600.16384	618	13.99%
7.5.7601.17514	539	12.20%
6.0.3790.3959	257	5.82%
10.0.14393.2608	250	5.66%
5.0.2195.5329	130	2.94%
8.0.9200.16384	126	2.85%
6.0.3790.1830	74	1.67%
7.0.6002.18264	72	1.63%
5.0.2195.6713	58	1.31%
Other	317	7.17%
IMail (1,285 servers)
Version	Number of Servers	Percent
12.5.6.101	188	14.63%
12.5.7.59	178	13.85%
12.4.1.15	122	9.49%
9.23	77	5.99%
12.5.3.93	73	5.68%
8.22	65	5.06%
12.5.5.115	64	4.98%
12.3.0.100	59	4.59%
8.15	48	3.74%
8.05	41	3.19%
12.5.4.146	38	2.96%
12.5.7.58	33	2.57%
11.03	31	2.41%
10.02	22	1.71%
12.5.6.105	20	1.56%
12.5.5.117	19	1.48%
11.5	18	1.40%
7.15	16	1.25%
10.01	14	1.09%
Other	159	12.37%
CommuniGate Pro (1,229 servers)
Version	Number of Servers	Percent
6.2.14	96	7.81%
6.2.12	74	6.02%
6.1.16	48	3.91%
6.0.11	47	3.82%
5.4.11	41	3.34%
6.2.13	39	3.17%
5.2.20	38	3.09%
5.3.13	35	2.85%
6.1.20	34	2.77%
6.1.18	29	2.36%
6.2.10	28	2.28%
5.1.16	27	2.20%
6.0.9	24	1.95%
6.1.11	23	1.87%
6.2.7	21	1.71%
5.2.3	19	1.55%
6.1.10	18	1.46%
6.2.9	17	1.38%
6.1.12	17	1.38%
6.2.1	16	1.30%
6.1.2	15	1.22%
6.1.9	14	1.14%
4.2.10	14	1.14%
6.1.13	14	1.14%
6.2.4	14	1.14%
4.1.8	13	1.06%
Other	454	36.94%
XMail (775 servers)
Version	Number of Servers	Percent
1.27	382	49.29%
1.22	245	31.61%
1.26	45	5.81%
1.25	41	5.29%
1.24	27	3.48%
Other	35	4.52%
Qmail Toaster (714 servers)
Version	Number of Servers	Percent
1.3	541	75.77%
1.03	150	21.01%
1.03.5	10	1.40%
Other	13	1.82%
SurgeSMTP (514 servers)
Version	Number of Servers	Percent
7.3o4-4	160	31.13%
7.3e2-2	59	11.48%
7.1e-1	31	6.03%
7.3i2-2	24	4.67%
6.5a2-2	23	4.47%
7.4a-1	19	3.70%
7.2i-1	17	3.31%
7.2a-1	16	3.11%
6.7c-1	16	3.11%
7.0c2-2	12	2.33%
3.9e-1	11	2.14%
6.9c-1	10	1.95%
6.5a-1	8	1.56%
7.2e-2	8	1.56%
4.0u4-4	7	1.36%
Other	93	18.09%
Lotus Domino (493 servers)
Version	Number of Servers	Percent
8.5.3FP6	105	21.30%
8.5.3	63	12.78%
8.5.2	27	5.48%
8.5	19	3.85%
7.0.2	19	3.85%
8.5.1	17	3.45%
7.0	12	2.43%
8.5.2FP2	11	2.23%
8.5.3FP1	11	2.23%
8.5.3FP2	11	2.23%
8.5.3FP3	11	2.23%
8.5.3FP4	10	2.03%
8.0.1	10	2.03%
8.5.2FP3	10	2.03%
7.0.3	9	1.83%
8.5.2FP4	9	1.83%
8.0	8	1.62%
8.5.3FP5	7	1.42%
6.5.4	6	1.22%
8.5.2FP4HF759	6	1.22%
8.5.1FP5	6	1.22%
6.5.5	6	1.22%
8.0.2	5	1.01%
7.0.1	5	1.01%
7.0.4FP2	5	1.01%
8.5.1FP4	5	1.01%
6.5.3	5	1.01%
7.0.3FP1	5	1.01%
Other	70	14.20%
WinWebMail (448 servers)
Version	Number of Servers	Percent
4.2.0.1	77	17.19%
3.9.0.7	72	16.07%
3.8.1.3	51	11.38%
3.9.0.1	35	7.81%
3.8.0.1	25	5.58%
4.1.0.1	17	3.79%
3.7.6.1	17	3.79%
3.8.1.5	17	3.79%
4.0.0.1	16	3.57%
3.8.1.1	12	2.68%
3.8.5.1	11	2.46%
3.7.3.1	10	2.23%
3.8.3.1	9	2.01%
3.9.2.1	9	2.01%
3.9.3.1	8	1.79%
3.7.7.3	7	1.56%
3.9.5.3	7	1.56%
3.8.2.1	7	1.56%
3.8.6.1	6	1.34%
3.7.1.1	6	1.34%
1.0	5	1.12%
Other	24	5.36%
OpenSMTPD (372 servers)
Version	Number of Servers	Percent
Other	372	100.00%
Kerio (235 servers)
Version	Number of Servers	Percent
6.7.3	57	24.26%
6.7.0	30	12.77%
6.7.2	24	10.21%
6.5.2	21	8.94%
6.6.2	20	8.51%
6.5.0	12	5.11%
6.6.1	11	4.68%
6.4.1	10	4.26%
6.7.1	9	3.83%
6.4.0	5	2.13%
6.3.1	5	2.13%
6.1.0	5	2.13%
6.6.0	4	1.70%
6.3.0	3	1.28%
6.1.3	3	1.28%
6.5.1	3	1.28%
Other	13	5.53%
MagicMail (172 servers)
Version	Number of Servers	Percent
Other	172	100.00%
Merak (144 servers)
Version	Number of Servers	Percent
8.0.3	34	23.61%
8.9.1	31	21.53%
7.6.1	10	6.94%
7.4.5	9	6.25%
8.5.0	9	6.25%
8.3.8	7	4.86%
9.0.3	7	4.86%
7.5.2	4	2.78%
7.6.4	3	2.08%
7.6.0	3	2.08%
7.0.1	3	2.08%
6.0.8	3	2.08%
7.4.2	2	1.39%
4.4.1	2	1.39%
Other	17	11.81%
Post.Office (130 servers)
Version	Number of Servers	Percent
4.3	32	24.62%
4.2.2	26	20.00%
4.4	17	13.08%
4.1.2.4	13	10.00%
3.5.3	9	6.92%
4.2.1.3	5	3.85%
4.1.1	3	2.31%
3.5.3J	3	2.31%
3.5.1	3	2.31%
3.9.2	2	1.54%
4.0.1	2	1.54%
4.2.1.1	2	1.54%
3.8.7.4	2	1.54%
Other	11	8.46%
ArGoSoft (100 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	32	32.00%
1.8 (1.8.9.3)	17	17.00%
1.8 (1.8.9.5)	15	15.00%
1.8 (1.8.9.1)	6	6.00%
1.8 (1.8.8.8)	3	3.00%
1.8 (1.8.7.6)	3	3.00%
1.8 (1.8.7.3)	2	2.00%
1.8 (1.8.8.9)	2	2.00%
1.8 (1.8.8.7)	2	2.00%
1.8 (1.8.8.4)	2	2.00%
1.8 (1.8.5.8)	2	2.00%
1.8 (1.8.9.2)	2	2.00%
1.8 (1.8.6.0)	2	2.00%
1.8 (1.8.2.1)	2	2.00%
1.8 (1.8.6.1)	1	1.00%
1.8 (1.8.5.5)	1	1.00%
1.8 (1.8.9.0)	1	1.00%
1.8 (1.8.9.4)	1	1.00%
1.8 (1.8.3.5)	1	1.00%
1.8 (1.8.1.1)	1	1.00%
1.8 (1.8.1.7)	1	1.00%
1.8 (1.8.2.5)	1	1.00%
Other	0	0.00%
GroupWise (71 servers)
Version	Number of Servers	Percent
18.1.1	12	16.90%
18.1.0	9	12.68%
14.2.2	8	11.27%
14.2.3	7	9.86%
14.2.1	5	7.04%
18.0.2	5	7.04%
14.2.0	4	5.63%
8.0.3	3	4.23%
6.5.7	2	2.82%
14.0.0	2	2.82%
18.0.0	2	2.82%
14.0.1	2	2.82%
6.5.0	1	1.41%
6.5.5	1	1.41%
12.0.1	1	1.41%
7.0.1	1	1.41%
18.0.1	1	1.41%
6.5.6	1	1.41%
6.5.4	1	1.41%
7.0.3	1	1.41%
7.0.2	1	1.41%
6.0.2	1	1.41%
Other	0	0.00%
Gordano Messaging Suite (GMS) (67 servers)
Version	Number of Servers	Percent
Other	67	100.00%
Trend Micro (41 servers)
Version	Number of Servers	Percent
5.7	11	26.83%
5.18	11	26.83%
5.5	5	12.20%
7.0	5	12.20%
7.5	4	9.76%
7.1	2	4.88%
7.5ready	1	2.44%
8	1	2.44%
9.0	1	2.44%
Other	0	0.00%
OpenVMS (14 servers)
Version	Number of Servers	Percent
8.4	7	50.00%
7.3	4	28.57%
8.3	2	14.29%
8.2	1	7.14%
Other	0	0.00%
VisNetic (10 servers)
Version	Number of Servers	Percent
9.3.2.0	7	70.00%
8.0.3	1	10.00%
9.1.4.0	1	10.00%
5.5.8.3	1	10.00%
Other	0	0.00%
InterScan VirusWall (10 servers)
Version	Number of Servers	Percent
Other	10	100.00%
Interscan (4 servers)
Version	Number of Servers	Percent
3.81-Build_1022	2	50.00%
3.8-Build_3013	1	25.00%
3.8-Build_1080	1	25.00%
Other	0	0.00%
Mercury (3 servers)
Version	Number of Servers	Percent
1.48	2	66.67%
3.32	1	33.33%
Other	0	0.00%
WebSTAR V (3 servers)
Version	Number of Servers	Percent
5.4.1	3	100.00%
Other	0	0.00%
ModusMail (2 servers)
Version	Number of Servers	Percent
4.1.361.21	2	100.00%
Other	0	0.00%
MessageWall (2 servers)
Version	Number of Servers	Percent
1.0.8	2	100.00%
Other	0	0.00%
Mirapoint (2 servers)
Version	Number of Servers	Percent
4.4.5-GA	1	50.00%
4.4.6-GA	1	50.00%
Other	0	0.00%
WebSTAR (1 servers)
Version	Number of Servers	Percent
Other	1	100.00%
Neon Mail Server (1 servers)
Version	Number of Servers	Percent
3.1.2	1	100.00%
Other	0	0.00%