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	1,730,839	100.0%
Number of Servers that didn't respond	317,087	18.32%
Server didn't open socket	309,925	17.91%
Server didn't provide banner	7,162	0.41%
Server provided banner	1,413,752	81.68%
Server banner identifies software in use	877,855	50.72%

As indicated by the above table, of the 1,730,839 servers queried, only 877,855 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	499,352	56.88%
Postfix	306,750	34.94%
Sendmail	34,415	3.92%
MailEnable	18,791	2.14%
MDaemon	7,274	0.83%
Microsoft	4,521	0.52%
IMail	1,279	0.15%
CommuniGate Pro	1,251	0.14%
XMail	783	0.09%
Qmail Toaster	637	0.07%
SurgeSMTP	491	0.06%
Lotus Domino	482	0.05%
WinWebMail	451	0.05%
OpenSMTPD	382	0.04%
Kerio	241	0.03%
MagicMail	162	0.02%
Merak	151	0.02%
Post.Office	130	0.01%
ArGoSoft	104	0.01%
GroupWise	64	0.01%
Gordano Messaging Suite (GMS)	53	0.01%
Trend Micro	43	0.00%
InterScan VirusWall	11	0.00%
VisNetic	10	0.00%
OpenVMS	9	0.00%
Mercury	4	0.00%
Interscan	4	0.00%
WebSTAR V	3	0.00%
ModusMail	2	0.00%
MessageWall	2	0.00%
WebSTAR	1	0.00%
Neon Mail Server	1	0.00%
Mirapoint	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (499,352 servers)
Version	Number of Servers	Percent
4.92	366,875	73.47%
4.91	44,646	8.94%
4.92.2	13,776	2.76%
4.92.3	13,232	2.65%
4.87	12,246	2.45%
4.89	9,822	1.97%
4.84	7,885	1.58%
4.90	5,376	1.08%
Other	25,494	5.11%
Postfix (306,750 servers)
Version	Number of Servers	Percent
Other	306,750	100.00%
Sendmail (34,415 servers)
Version	Number of Servers	Percent
8.15.2	12,490	36.29%
8.14.4	6,542	19.01%
8.13.8	3,417	9.93%
8.14.7	2,936	8.53%
8.14.5	2,641	7.67%
8.13.1	2,214	6.43%
8.14.9	1,384	4.02%
8.14.3	684	1.99%
Other	2,107	6.12%
MailEnable (18,791 servers)
Version	Number of Servers	Percent
10.25--	6,477	34.47%
9.00--	1,108	5.90%
10.12--	599	3.19%
9.16--	501	2.67%
8.60--	359	1.91%
8.53--	290	1.54%
10.20--	277	1.47%
6.5--	269	1.43%
10.26--	269	1.43%
8.60-8.60-	260	1.38%
10.25--10.25	233	1.24%
8.51--	229	1.22%
10.25-10.25-	223	1.19%
9.00--9.00	194	1.03%
Other	7,503	39.93%
MDaemon (7,274 servers)
Version	Number of Servers	Percent
19.0.3	954	13.12%
13.5.1	469	6.45%
13.6.3	396	5.44%
13.0.4	305	4.19%
13.0.5	284	3.90%
11.0.3	273	3.75%
11.0.0	266	3.66%
16.5.2	227	3.12%
12.5.6	161	2.21%
12.5.4	155	2.13%
14.5.2	150	2.06%
18.5.3	128	1.76%
19.0.2	125	1.72%
18.5.1	110	1.51%
19.0.1	108	1.48%
18.5.2	106	1.46%
10.0.0	99	1.36%
10.1.2	94	1.29%
15.0.3	94	1.29%
16.0.4	91	1.25%
18.0.2	77	1.06%
10.1.0	76	1.04%
Other	2,526	34.73%
Microsoft (4,521 servers)
Version	Number of Servers	Percent
6.0.3790.4675	2,038	45.08%
8.5.9600.16384	618	13.67%
7.5.7601.17514	560	12.39%
6.0.3790.3959	261	5.77%
10.0.14393.2608	248	5.49%
8.0.9200.16384	133	2.94%
5.0.2195.5329	130	2.88%
6.0.3790.1830	78	1.73%
7.0.6002.18264	72	1.59%
5.0.2195.6713	56	1.24%
Other	327	7.23%
IMail (1,279 servers)
Version	Number of Servers	Percent
12.5.6.101	186	14.54%
12.5.7.59	151	11.81%
12.4.1.15	124	9.70%
12.5.5.115	79	6.18%
12.5.3.93	77	6.02%
9.23	77	6.02%
8.22	62	4.85%
12.3.0.100	61	4.77%
8.15	50	3.91%
12.5.4.146	42	3.28%
8.05	40	3.13%
11.03	32	2.50%
12.5.7.58	31	2.42%
10.02	22	1.72%
12.5.6.105	20	1.56%
11.5	18	1.41%
12.5.5.117	18	1.41%
7.15	14	1.09%
10.01	14	1.09%
Other	161	12.59%
CommuniGate Pro (1,251 servers)
Version	Number of Servers	Percent
6.2.12	52	4.16%
6.2.14	49	3.92%
6.1.16	35	2.80%
6.2.12.	32	2.56%
6.2.13	31	2.48%
6.0.11	28	2.24%
6.1.20	27	2.16%
5.4.11	26	2.08%
5.1.16	24	1.92%
6.2.10	24	1.92%
6.2.14.	23	1.84%
5.3.13	22	1.76%
6.1.18	22	1.76%
6.0.9	21	1.68%
5.2.20	21	1.68%
6.0.11.	18	1.44%
6.1.11	17	1.36%
5.2.20.	16	1.28%
6.1.16.	16	1.28%
5.4.11.	15	1.20%
6.1.10	15	1.20%
6.2.9	15	1.20%
5.2.3	14	1.12%
6.1.2	14	1.12%
6.1.12	14	1.12%
5.3.13.	13	1.04%
Other	647	51.72%
XMail (783 servers)
Version	Number of Servers	Percent
1.27	386	49.30%
1.22	248	31.67%
1.25	44	5.62%
1.26	44	5.62%
1.24	27	3.45%
Other	34	4.34%
Qmail Toaster (637 servers)
Version	Number of Servers	Percent
1.3	476	74.73%
1.03	144	22.61%
1.03.5	8	1.26%
Other	9	1.41%
SurgeSMTP (491 servers)
Version	Number of Servers	Percent
7.3o4-4	162	32.99%
7.3e2-2	61	12.42%
7.1e-1	27	5.50%
7.3i2-2	26	5.30%
6.5a2-2	22	4.48%
6.7c-1	18	3.67%
7.2a-1	16	3.26%
7.2i-1	16	3.26%
7.0c2-2	15	3.05%
6.9c-1	10	2.04%
3.9e-1	9	1.83%
7.4a-1	9	1.83%
7.2e-2	7	1.43%
4.0u4-4	7	1.43%
6.1c-1	5	1.02%
6.5a-1	5	1.02%
5.2a-1	5	1.02%
Other	71	14.46%
Lotus Domino (482 servers)
Version	Number of Servers	Percent
8.5.3FP6	104	21.58%
8.5.3	66	13.69%
8.5.2	22	4.56%
8.5	20	4.15%
7.0.2	17	3.53%
8.5.1	16	3.32%
8.5.3FP2	13	2.70%
7.0	12	2.49%
8.5.3FP1	12	2.49%
8.5.2FP2	11	2.28%
8.5.3FP3	11	2.28%
8.5.3FP4	10	2.07%
8.0.1	9	1.87%
7.0.3	9	1.87%
8.5.2FP4	9	1.87%
8.5.2FP3	9	1.87%
8.5.3FP5	6	1.24%
8.5.2FP4HF759	6	1.24%
8.5.1FP5	6	1.24%
8.0	6	1.24%
8.0.2	5	1.04%
6.5	5	1.04%
7.0.1	5	1.04%
8.5.1FP4	5	1.04%
6.5.3	5	1.04%
6.5.5	5	1.04%
7.0.3FP1	5	1.04%
Other	73	15.15%
WinWebMail (451 servers)
Version	Number of Servers	Percent
4.2.0.1	79	17.52%
3.9.0.7	75	16.63%
3.8.1.3	45	9.98%
3.9.0.1	35	7.76%
3.8.0.1	23	5.10%
3.7.6.1	17	3.77%
4.0.0.1	17	3.77%
4.1.0.1	15	3.33%
3.8.1.5	14	3.10%
3.8.2.1	12	2.66%
3.7.3.1	11	2.44%
3.8.1.1	11	2.44%
3.8.5.1	11	2.44%
3.9.2.1	11	2.44%
3.7.7.3	10	2.22%
3.8.3.1	9	2.00%
3.9.3.1	8	1.77%
3.8.6.1	7	1.55%
3.9.5.3	6	1.33%
3.7.1.1	5	1.11%
Other	30	6.65%
OpenSMTPD (382 servers)
Version	Number of Servers	Percent
Other	382	100.00%
Kerio (241 servers)
Version	Number of Servers	Percent
6.7.3	58	24.07%
6.7.0	30	12.45%
6.7.2	23	9.54%
6.5.2	22	9.13%
6.6.2	19	7.88%
6.6.1	11	4.56%
6.5.0	11	4.56%
6.4.1	10	4.15%
6.7.1	9	3.73%
6.3.1	7	2.90%
6.4.0	6	2.49%
6.5.1	5	2.07%
6.6.0	5	2.07%
6.1.0	4	1.66%
6.3.0	3	1.24%
6.1.3	3	1.24%
5.7.9	3	1.24%
Other	12	4.98%
MagicMail (162 servers)
Version	Number of Servers	Percent
Other	162	100.00%
Merak (151 servers)
Version	Number of Servers	Percent
8.0.3	36	23.84%
8.9.1	33	21.85%
8.5.0	10	6.62%
7.6.1	10	6.62%
7.4.5	9	5.96%
8.3.8	7	4.64%
9.0.3	6	3.97%
7.5.2	4	2.65%
7.6.4	4	2.65%
7.6.0	3	1.99%
7.0.1	3	1.99%
6.0.8	3	1.99%
7.4.2	2	1.32%
4.4.1	2	1.32%
Other	19	12.58%
Post.Office (130 servers)
Version	Number of Servers	Percent
4.3	33	25.38%
4.2.2	25	19.23%
4.4	18	13.85%
4.1.2.4	13	10.00%
3.5.3	8	6.15%
4.2.1.3	5	3.85%
3.5.3J	4	3.08%
4.2.1.1	3	2.31%
3.5.1	3	2.31%
3.9.2	2	1.54%
4.0.1	2	1.54%
4.1.1	2	1.54%
3.8.7.4	2	1.54%
Other	10	7.69%
ArGoSoft (104 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	37	35.58%
1.8 (1.8.9.3)	15	14.42%
1.8 (1.8.9.5)	15	14.42%
1.8 (1.8.9.1)	6	5.77%
1.8 (1.8.8.8)	3	2.88%
1.8 (1.8.7.6)	3	2.88%
1.8 (1.8.6.0)	3	2.88%
1.8 (1.8.7.3)	2	1.92%
1.8 (1.8.8.9)	2	1.92%
1.8 (1.8.8.7)	2	1.92%
1.8 (1.8.8.4)	2	1.92%
1.8 (1.8.5.8)	2	1.92%
1.8 (1.8.9.2)	2	1.92%
1.8 (1.8.2.1)	2	1.92%
Other	8	7.69%
GroupWise (64 servers)
Version	Number of Servers	Percent
18.1.1	12	18.75%
14.2.2	8	12.50%
18.1.0	7	10.94%
14.2.3	6	9.38%
14.2.1	5	7.81%
18.0.2	5	7.81%
14.2.0	3	4.69%
6.5.7	3	4.69%
14.0.1	2	3.12%
8.0.3	2	3.12%
6.5.0	1	1.56%
6.5.5	1	1.56%
12.0.1	1	1.56%
7.0.1	1	1.56%
18.0.1	1	1.56%
6.5.6	1	1.56%
6.5.2	1	1.56%
14.0.0	1	1.56%
7.0.2	1	1.56%
6.0.2	1	1.56%
6.0.4	1	1.56%
Other	0	0.00%
Gordano Messaging Suite (GMS) (53 servers)
Version	Number of Servers	Percent
Other	53	100.00%
Trend Micro (43 servers)
Version	Number of Servers	Percent
5.7	13	30.23%
5.18	11	25.58%
5.5	5	11.63%
7.0	5	11.63%
7.5	4	9.30%
7.1	2	4.65%
7.5ready	1	2.33%
8	1	2.33%
9.0	1	2.33%
Other	0	0.00%
InterScan VirusWall (11 servers)
Version	Number of Servers	Percent
Other	11	100.00%
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%
OpenVMS (9 servers)
Version	Number of Servers	Percent
7.3	4	44.44%
8.4	3	33.33%
8.3	1	11.11%
8.2	1	11.11%
Other	0	0.00%
Mercury (4 servers)
Version	Number of Servers	Percent
3.32	3	75.00%
1.48	1	25.00%
Other	0	0.00%
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%
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%
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%
Mirapoint (1 servers)
Version	Number of Servers	Percent
4.4.6-GA	1	100.00%
Other	0	0.00%