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	1,219,228	100.0%
Number of Servers that didn't respond	231,024	18.95%
Server didn't open socket	227,973	18.70%
Server didn't provide banner	3,051	0.25%
Server provided banner	988,204	81.05%
Server banner identifies software in use	624,217	51.20%

As indicated by the above table, of the 1,219,228 servers queried, only 624,217 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	349,133	55.93%
Postfix	233,472	37.40%
Sendmail	21,539	3.45%
MailEnable	11,582	1.86%
MDaemon	3,004	0.48%
Microsoft	1,565	0.25%
CommuniGate Pro	845	0.14%
OpenSMTPD	567	0.09%
IMail	535	0.09%
XMail	479	0.08%
SurgeSMTP	346	0.06%
Qmail Toaster	240	0.04%
WinWebMail	207	0.03%
Lotus Domino	166	0.03%
MagicMail	160	0.03%
Kerio	79	0.01%
Merak	77	0.01%
Post.Office	74	0.01%
ArGoSoft	44	0.01%
GroupWise	41	0.01%
Gordano Messaging Suite (GMS)	26	0.00%
OpenVMS	10	0.00%
InterScan VirusWall	8	0.00%
Trend Micro	5	0.00%
VisNetic	5	0.00%
ModusMail	2	0.00%
MessageWall	2	0.00%
Mercury	1	0.00%
WebSTAR	1	0.00%
Mirapoint	1	0.00%
WebSTAR V	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (349,133 servers)
Version	Number of Servers	Percent
4.96	198,164	56.76%
4.95	92,811	26.58%
4.94.2	15,278	4.38%
4.93	13,327	3.82%
4.92	5,217	1.49%
Other	24,336	6.97%
Postfix (233,472 servers)
Version	Number of Servers	Percent
Other	233,472	100.00%
Sendmail (21,539 servers)
Version	Number of Servers	Percent
8.16.1	6,582	30.56%
8.15.2	5,966	27.70%
8.14.7	2,488	11.55%
8.14.4	2,210	10.26%
8.13.8	1,055	4.90%
8.14.5	990	4.60%
8.17.1	527	2.45%
8.14.9	319	1.48%
8.13.1	318	1.48%
Other	1,084	5.03%
MailEnable (11,582 servers)
Version	Number of Servers	Percent
10.43--	4,676	40.37%
10.34--	707	6.10%
10.27--	459	3.96%
10.25--	382	3.30%
10.42--	291	2.51%
10.45--	291	2.51%
10.43-10.43-	260	2.24%
10.45--10.45	212	1.83%
9.00--	204	1.76%
10.45-10.45-	152	1.31%
10.43--10.43	141	1.22%
10.31--	130	1.12%
Other	3,677	31.75%
MDaemon (3,004 servers)
Version	Number of Servers	Percent
23.0.1	519	17.28%
13.5.1	151	5.03%
19.5.4	121	4.03%
13.0.5	118	3.93%
11.0.0	107	3.56%
13.0.4	106	3.53%
11.0.3	104	3.46%
22.0.3	102	3.40%
21.5.2	95	3.16%
23.0.0	87	2.90%
16.5.2	73	2.43%
21.5.3	64	2.13%
14.5.2	63	2.10%
12.5.6	53	1.76%
19.5.5	47	1.56%
10.0.0	35	1.17%
12.5.4	32	1.07%
Other	1,127	37.52%
Microsoft (1,565 servers)
Version	Number of Servers	Percent
6.0.3790.4675	440	28.12%
10.0.17763.1697	223	14.25%
8.5.9600.16384	218	13.93%
10.0.14393.4169	175	11.18%
7.5.7601.17514	111	7.09%
6.0.3790.3959	88	5.62%
5.0.2195.5329	59	3.77%
8.0.9200.16384	43	2.75%
5.0.2195.6713	28	1.79%
6.0.3790.1830	20	1.28%
7.0.6002.18264	19	1.21%
10.0.17763.1	19	1.21%
5.0.2195.7381	17	1.09%
Other	105	6.71%
CommuniGate Pro (845 servers)
Version	Number of Servers	Percent
6.2.15	74	8.76%
6.2.14	71	8.40%
6.3.18	53	6.27%
6.3.17	52	6.15%
6.1.20	34	4.02%
6.3.19	29	3.43%
5.4.11	19	2.25%
6.0.11	16	1.89%
7.1.4	15	1.78%
6.1.16	15	1.78%
6.1.18	15	1.78%
6.3.14	14	1.66%
6.2.12	14	1.66%
6.0.9	14	1.66%
5.2.20	13	1.54%
6.3.6	11	1.30%
5.1.16	10	1.18%
7.1.1	9	1.07%
6.3.15	9	1.07%
6.3.16	9	1.07%
Other	349	41.30%
OpenSMTPD (567 servers)
Version	Number of Servers	Percent
Other	567	100.00%
IMail (535 servers)
Version	Number of Servers	Percent
12.5.8.41	56	10.47%
12.5.6.101	48	8.97%
12.6.0.17	38	7.10%
12.5.7.59	37	6.92%
12.4.1.15	34	6.36%
9.23	33	6.17%
12.5.8.58	28	5.23%
12.5.6.105	26	4.86%
8.22	22	4.11%
8.05	22	4.11%
12.5.8.54	20	3.74%
12.5.3.93	20	3.74%
12.5.8.59	17	3.18%
12.5.5.115	15	2.80%
12.5.4.146	13	2.43%
12.3.0.100	13	2.43%
12.6.0.19	9	1.68%
11.03	8	1.50%
8.15	7	1.31%
8.00	6	1.12%
12.5.5.117	6	1.12%
Other	57	10.65%
XMail (479 servers)
Version	Number of Servers	Percent
1.27	293	61.17%
1.22	121	25.26%
1.26	19	3.97%
1.25	17	3.55%
1.24	12	2.51%
1.15	6	1.25%
Other	11	2.30%
SurgeSMTP (346 servers)
Version	Number of Servers	Percent
7.7c-1	58	16.76%
7.6j-1	35	10.12%
7.6u-1	28	8.09%
7.3o4-4	27	7.80%
7.5c-1	21	6.07%
7.3e2-2	16	4.62%
7.1e-1	11	3.18%
7.6h-2	11	3.18%
7.5a-1	10	2.89%
7.4o-1	9	2.60%
6.9c-1	9	2.60%
7.6d-1	9	2.60%
7.4e-1	8	2.31%
7.6s-1	7	2.02%
7.3i2-2	6	1.73%
7.2i-1	6	1.73%
6.5a2-2	6	1.73%
6.7c-1	5	1.45%
7.4m-1	4	1.16%
6.5a-1	4	1.16%
Other	56	16.18%
Qmail Toaster (240 servers)
Version	Number of Servers	Percent
1.03	125	52.08%
1.3	105	43.75%
1.03.5	6	2.50%
1.03.6	3	1.25%
Other	1	0.42%
WinWebMail (207 servers)
Version	Number of Servers	Percent
4.4.0.1	38	18.36%
4.2.0.1	31	14.98%
3.9.0.7	22	10.63%
3.8.1.3	20	9.66%
4.3.0.1	11	5.31%
3.7.3.1	8	3.86%
3.9.0.1	8	3.86%
3.8.0.1	8	3.86%
4.0.0.1	7	3.38%
3.8.6.1	6	2.90%
4.1.0.1	6	2.90%
3.8.1.5	6	2.90%
4.5.0.1	5	2.42%
3.9.2.1	4	1.93%
3.7.7.3	3	1.45%
3.7.1.1	3	1.45%
3.8.5.1	3	1.45%
3.8.1.1	3	1.45%
Other	15	7.25%
Lotus Domino (166 servers)
Version	Number of Servers	Percent
8.5.3FP6	32	19.28%
8.5.3	29	17.47%
8.5.1	9	5.42%
7.0	8	4.82%
7.0.2	7	4.22%
6.5	6	3.61%
8.5.2	6	3.61%
8.5.1FP5	5	3.01%
7.0.3	5	3.01%
6.5.3	4	2.41%
8.0	4	2.41%
8.5.3FP5	3	1.81%
6.5.2	3	1.81%
6.5.1	3	1.81%
8.5.2FP2	3	1.81%
8.5.3FP3	3	1.81%
8.0.1	3	1.81%
8.5.2FP1	2	1.20%
8.5.3FP1	2	1.20%
5.0.13a	2	1.20%
6.5.4	2	1.20%
8.5.2FP4	2	1.20%
8.5	2	1.20%
7.0.4FP2	2	1.20%
7.0.3FP1	2	1.20%
Other	17	10.24%
MagicMail (160 servers)
Version	Number of Servers	Percent
Other	160	100.00%
Kerio (79 servers)
Version	Number of Servers	Percent
6.7.3	16	20.25%
6.6.1	10	12.66%
6.6.2	8	10.13%
6.7.0	8	10.13%
6.7.1	6	7.59%
6.7.2	5	6.33%
6.5.2	5	6.33%
6.5.0	4	5.06%
6.4.1	3	3.80%
6.3.1	3	3.80%
5.7.9	2	2.53%
6.3.0	2	2.53%
6.6.0	2	2.53%
6.5.1	2	2.53%
6.0.10	1	1.27%
6.0.8	1	1.27%
5.7.6	1	1.27%
Other	0	0.00%
Merak (77 servers)
Version	Number of Servers	Percent
8.9.1	22	28.57%
8.0.3	21	27.27%
7.6.1	8	10.39%
8.3.8	5	6.49%
7.4.5	4	5.19%
8.5.0	2	2.60%
6.0.8	2	2.60%
8.0.1	1	1.30%
8.9.2	1	1.30%
8.3.6	1	1.30%
6.1.0	1	1.30%
7.6.4	1	1.30%
6.2.1	1	1.30%
9.0.3	1	1.30%
7.5.2	1	1.30%
4.2.1	1	1.30%
7.6.0	1	1.30%
7.4.4	1	1.30%
7.0.1	1	1.30%
5.8.2	1	1.30%
Other	0	0.00%
Post.Office (74 servers)
Version	Number of Servers	Percent
4.4	31	41.89%
4.2.2	11	14.86%
4.3	10	13.51%
4.1.2.4	5	6.76%
3.5.3	4	5.41%
3.5.1	3	4.05%
3.9.2	2	2.70%
4.2	2	2.70%
4.2.1.3	2	2.70%
4.0.1	1	1.35%
4.1	1	1.35%
3.1.2	1	1.35%
4.2.1.1	1	1.35%
Other	0	0.00%
ArGoSoft (44 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	15	34.09%
1.8 (1.8.9.3)	5	11.36%
1.8 (1.8.9.5)	5	11.36%
1.8 (1.8.9.1)	3	6.82%
1.8 (1.8.8.8)	2	4.55%
1.8 (1.8.7.3)	2	4.55%
1.8 (1.8.8.9)	2	4.55%
1.8 (1.8.8.7)	2	4.55%
1.8 (1.8.9.2)	2	4.55%
1.8 (1.8.7.6)	1	2.27%
1.8 (1.8.8.4)	1	2.27%
1.8 (1.8.6.0)	1	2.27%
1.8 (1.8.5.9)	1	2.27%
1.8 (1.8.9.4)	1	2.27%
1.8 (1.8.3.5)	1	2.27%
Other	0	0.00%
GroupWise (41 servers)
Version	Number of Servers	Percent
18.3.1	9	21.95%
18.4.2	7	17.07%
18.2.1	5	12.20%
18.1.1	3	7.32%
18.2.0	3	7.32%
14.2.2	2	4.88%
14.0.0	2	4.88%
6.5.7	1	2.44%
14.2.1	1	2.44%
18.5.0	1	2.44%
14.2.3	1	2.44%
18.0.0	1	2.44%
18.4.1	1	2.44%
18.3.0	1	2.44%
18.1.0	1	2.44%
18.0.2	1	2.44%
18.4.0	1	2.44%
Other	0	0.00%
Gordano Messaging Suite (GMS) (26 servers)
Version	Number of Servers	Percent
Other	26	100.00%
OpenVMS (10 servers)
Version	Number of Servers	Percent
8.4	6	60.00%
7.3	3	30.00%
8.2	1	10.00%
Other	0	0.00%
InterScan VirusWall (8 servers)
Version	Number of Servers	Percent
Other	8	100.00%
Trend Micro (5 servers)
Version	Number of Servers	Percent
5.18	3	60.00%
5.7	1	20.00%
5.5	1	20.00%
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%
MessageWall (2 servers)
Version	Number of Servers	Percent
1.0.8	2	100.00%
Other	0	0.00%
Mercury (1 servers)
Version	Number of Servers	Percent
1.48	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%
WebSTAR V (1 servers)
Version	Number of Servers	Percent
5.3.2	1	100.00%
Other	0	0.00%