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	1,380,107	100.0%
Number of Servers that didn't respond	243,949	17.68%
Server didn't open socket	239,947	17.39%
Server didn't provide banner	4,002	0.29%
Server provided banner	1,136,158	82.32%
Server banner identifies software in use	714,688	51.78%

As indicated by the above table, of the 1,380,107 servers queried, only 714,688 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	411,621	57.59%
Postfix	248,020	34.70%
Sendmail	26,814	3.75%
MailEnable	14,810	2.07%
MDaemon	5,188	0.73%
Microsoft	2,992	0.42%
CommuniGate Pro	992	0.14%
IMail	896	0.13%
Qmail Toaster	601	0.08%
XMail	594	0.08%
SurgeSMTP	420	0.06%
OpenSMTPD	352	0.05%
WinWebMail	317	0.04%
Lotus Domino	305	0.04%
MagicMail	148	0.02%
Kerio	138	0.02%
Merak	126	0.02%
Post.Office	97	0.01%
ArGoSoft	83	0.01%
GroupWise	62	0.01%
Gordano Messaging Suite (GMS)	46	0.01%
Trend Micro	27	0.00%
OpenVMS	13	0.00%
VisNetic	8	0.00%
InterScan VirusWall	4	0.00%
Mercury	3	0.00%
Interscan	3	0.00%
ModusMail	2	0.00%
WebSTAR V	2	0.00%
Mirapoint	2	0.00%
MessageWall	1	0.00%
WebSTAR	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (411,621 servers)
Version	Number of Servers	Percent
4.93	234,806	57.04%
4.92	79,071	19.21%
4.91	22,216	5.40%
4.93.0.4	16,787	4.08%
4.92.3	14,709	3.57%
4.87	7,193	1.75%
4.89	6,840	1.66%
4.84	5,689	1.38%
4.90	4,191	1.02%
Other	20,119	4.89%
Postfix (248,020 servers)
Version	Number of Servers	Percent
Other	248,020	100.00%
Sendmail (26,814 servers)
Version	Number of Servers	Percent
8.15.2	11,584	43.20%
8.14.4	4,686	17.48%
8.14.7	2,484	9.26%
8.13.8	2,259	8.42%
8.14.5	1,800	6.71%
8.13.1	1,270	4.74%
8.14.9	778	2.90%
8.14.3	464	1.73%
Other	1,489	5.55%
MailEnable (14,810 servers)
Version	Number of Servers	Percent
10.25--	3,729	25.18%
10.27--	2,487	16.79%
9.00--	664	4.48%
10.29--	438	2.96%
10.12--	269	1.82%
9.16--	234	1.58%
10.29--10.29	227	1.53%
8.60--	220	1.49%
10.29-10.29-	208	1.40%
9.00--9.00	163	1.10%
8.53--	159	1.07%
Other	6,012	40.59%
MDaemon (5,188 servers)
Version	Number of Servers	Percent
19.5.5	829	15.98%
13.5.1	334	6.44%
13.6.3	307	5.92%
13.0.4	205	3.95%
13.0.5	204	3.93%
11.0.0	180	3.47%
11.0.3	178	3.43%
19.5.4	156	3.01%
16.5.2	152	2.93%
12.5.6	113	2.18%
12.5.4	103	1.99%
14.5.2	100	1.93%
19.5.3	98	1.89%
19.0.3	78	1.50%
10.1.2	70	1.35%
10.0.0	60	1.16%
15.0.3	59	1.14%
16.0.4	56	1.08%
Other	1,906	36.74%
Microsoft (2,992 servers)
Version	Number of Servers	Percent
6.0.3790.4675	1,229	41.08%
8.5.9600.16384	475	15.88%
7.5.7601.17514	339	11.33%
10.0.14393.2608	215	7.19%
6.0.3790.3959	164	5.48%
10.0.17763.1	95	3.18%
5.0.2195.5329	91	3.04%
8.0.9200.16384	71	2.37%
5.0.2195.6713	47	1.57%
6.0.3790.1830	42	1.40%
7.0.6002.18264	41	1.37%
5.0.2195.7381	31	1.04%
Other	152	5.08%
CommuniGate Pro (992 servers)
Version	Number of Servers	Percent
6.2.14	110	11.09%
6.2.15	68	6.85%
6.2.12	37	3.73%
6.0.11	35	3.53%
5.4.11	34	3.43%
6.1.20	34	3.43%
6.1.16	33	3.33%
5.3.13	28	2.82%
5.2.20	27	2.72%
6.1.18	22	2.22%
5.1.16	22	2.22%
6.2.13	21	2.12%
6.0.9	18	1.81%
6.2.7	14	1.41%
5.2.3	13	1.31%
6.2.9	13	1.31%
6.1.12	13	1.31%
6.1.11	12	1.21%
4.2.10	11	1.11%
6.1.2	11	1.11%
6.2.10	11	1.11%
6.1.9	11	1.11%
5.3.15	10	1.01%
Other	384	38.71%
IMail (896 servers)
Version	Number of Servers	Percent
12.5.7.59	128	14.29%
12.5.6.101	111	12.39%
12.5.8.41	76	8.48%
12.4.1.15	67	7.48%
9.23	58	6.47%
8.22	47	5.25%
12.5.3.93	44	4.91%
12.5.5.115	39	4.35%
8.15	35	3.91%
12.3.0.100	35	3.91%
8.05	34	3.79%
11.03	23	2.57%
12.5.4.146	22	2.46%
10.02	19	2.12%
12.5.6.105	15	1.67%
12.5.7.58	15	1.67%
12.5.5.117	14	1.56%
7.07	10	1.12%
11.5	9	1.00%
Other	95	10.60%
Qmail Toaster (601 servers)
Version	Number of Servers	Percent
1.3	453	75.37%
1.03	133	22.13%
1.03.5	7	1.16%
Other	8	1.33%
XMail (594 servers)
Version	Number of Servers	Percent
1.27	306	51.52%
1.22	186	31.31%
1.26	31	5.22%
1.25	28	4.71%
1.24	18	3.03%
Other	25	4.21%
SurgeSMTP (420 servers)
Version	Number of Servers	Percent
7.3o4-4	94	22.38%
7.4e-1	59	14.05%
7.3e2-2	39	9.29%
7.1e-1	23	5.48%
6.5a2-2	21	5.00%
7.3i2-2	20	4.76%
6.7c-1	14	3.33%
7.2i-1	12	2.86%
7.2a-1	10	2.38%
3.9e-1	9	2.14%
7.4i-1	7	1.67%
6.5a-1	6	1.43%
7.4g-1	5	1.19%
6.9c-1	5	1.19%
7.0c2-2	5	1.19%
Other	91	21.67%
OpenSMTPD (352 servers)
Version	Number of Servers	Percent
Other	352	100.00%
WinWebMail (317 servers)
Version	Number of Servers	Percent
4.2.0.1	76	23.97%
3.9.0.7	57	17.98%
3.8.1.3	30	9.46%
3.8.0.1	19	5.99%
3.9.0.1	17	5.36%
4.1.0.1	11	3.47%
3.7.6.1	11	3.47%
3.7.3.1	10	3.15%
4.0.0.1	9	2.84%
3.8.1.1	9	2.84%
3.9.2.1	8	2.52%
3.8.6.1	7	2.21%
3.8.1.5	7	2.21%
3.8.3.1	6	1.89%
3.7.7.3	6	1.89%
3.8.5.1	5	1.58%
3.9.3.1	4	1.26%
1.0	4	1.26%
3.9.5.3	4	1.26%
Other	17	5.36%
Lotus Domino (305 servers)
Version	Number of Servers	Percent
8.5.3FP6	59	19.34%
8.5.3	40	13.11%
8.5.1	13	4.26%
7.0.2	13	4.26%
8.5.2	12	3.93%
8.5.2FP2	11	3.61%
7.0	10	3.28%
8.5	10	3.28%
7.0.3	8	2.62%
8.0.1	7	2.30%
8.5.3FP4	7	2.30%
8.5.3FP1	7	2.30%
8.5.2FP3	7	2.30%
8.5.3FP5	6	1.97%
6.5.4	6	1.97%
8.5.3FP3	6	1.97%
8.5.3FP2	5	1.64%
8.5.2FP4	5	1.64%
8.5.1FP5	5	1.64%
8.0.2	4	1.31%
6.5.3	4	1.31%
7.0.3FP1	4	1.31%
Other	56	18.36%
MagicMail (148 servers)
Version	Number of Servers	Percent
Other	148	100.00%
Kerio (138 servers)
Version	Number of Servers	Percent
6.7.3	35	25.36%
6.7.0	18	13.04%
6.6.2	16	11.59%
6.7.2	12	8.70%
6.6.1	9	6.52%
6.5.2	9	6.52%
6.7.1	8	5.80%
6.5.0	8	5.80%
6.4.1	3	2.17%
6.3.0	3	2.17%
6.3.1	2	1.45%
5.7.9	2	1.45%
5.7.6	2	1.45%
6.1.0	2	1.45%
6.5.1	2	1.45%
6.1.3	2	1.45%
Other	5	3.62%
Merak (126 servers)
Version	Number of Servers	Percent
8.9.1	31	24.60%
8.0.3	29	23.02%
7.6.1	9	7.14%
7.4.5	8	6.35%
8.5.0	7	5.56%
9.0.3	6	4.76%
8.3.8	5	3.97%
7.5.2	4	3.17%
7.6.4	4	3.17%
4.4.1	2	1.59%
7.6.0	2	1.59%
7.0.1	2	1.59%
6.0.8	2	1.59%
Other	15	11.90%
Post.Office (97 servers)
Version	Number of Servers	Percent
4.3	25	25.77%
4.4	18	18.56%
4.2.2	17	17.53%
4.1.2.4	9	9.28%
3.5.3	7	7.22%
4.2.1.1	3	3.09%
3.9.2	2	2.06%
4.1.1	2	2.06%
4.0.1	2	2.06%
4.1.2.1	1	1.03%
3.9.2.1	1	1.03%
3.5.3J	1	1.03%
3.5.1	1	1.03%
3.6.2	1	1.03%
3.9.1.3	1	1.03%
4.1.0.3	1	1.03%
4.2.1.3	1	1.03%
4.1	1	1.03%
3.1.2	1	1.03%
3.1.2J	1	1.03%
4.2	1	1.03%
Other	0	0.00%
ArGoSoft (83 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	27	32.53%
1.8 (1.8.9.3)	13	15.66%
1.8 (1.8.9.5)	13	15.66%
1.8 (1.8.9.1)	6	7.23%
1.8 (1.8.8.8)	3	3.61%
1.8 (1.8.7.3)	3	3.61%
1.8 (1.8.7.6)	2	2.41%
1.8 (1.8.8.9)	2	2.41%
1.8 (1.8.9.2)	2	2.41%
1.8 (1.8.6.0)	2	2.41%
1.8 (1.8.2.1)	2	2.41%
1.8 (1.8.6.1)	1	1.20%
1.8 (1.8.8.7)	1	1.20%
1.8 (1.8.5.8)	1	1.20%
1.8 (1.8.8.4)	1	1.20%
1.8 (1.8.1.7)	1	1.20%
1.8 (1.8.9.4)	1	1.20%
1.8 (1.8.1.1)	1	1.20%
1.8 (1.8.2.5)	1	1.20%
Other	0	0.00%
GroupWise (62 servers)
Version	Number of Servers	Percent
18.1.1	10	16.13%
18.2.0	8	12.90%
18.1.0	6	9.68%
14.2.1	5	8.06%
14.2.3	5	8.06%
14.2.2	5	8.06%
18.2.1	4	6.45%
18.0.2	3	4.84%
14.0.1	2	3.23%
14.2.0	2	3.23%
14.0.0	2	3.23%
18.0.0	2	3.23%
6.5.7	1	1.61%
8.0.3	1	1.61%
7.0.1	1	1.61%
6.5.6	1	1.61%
6.5.4	1	1.61%
7.0.2	1	1.61%
5.2	1	1.61%
6.0.2	1	1.61%
Other	0	0.00%
Gordano Messaging Suite (GMS) (46 servers)
Version	Number of Servers	Percent
Other	46	100.00%
Trend Micro (27 servers)
Version	Number of Servers	Percent
5.7	7	25.93%
5.18	7	25.93%
7.5	5	18.52%
5.5	4	14.81%
7.0	2	7.41%
7.5ready	1	3.70%
7.1	1	3.70%
Other	0	0.00%
OpenVMS (13 servers)
Version	Number of Servers	Percent
8.4	7	53.85%
7.3	3	23.08%
8.3	2	15.38%
8.2	1	7.69%
Other	0	0.00%
VisNetic (8 servers)
Version	Number of Servers	Percent
9.3.2.0	7	87.50%
8.0.3	1	12.50%
Other	0	0.00%
InterScan VirusWall (4 servers)
Version	Number of Servers	Percent
Other	4	100.00%
Mercury (3 servers)
Version	Number of Servers	Percent
1.48	2	66.67%
3.32	1	33.33%
Other	0	0.00%
Interscan (3 servers)
Version	Number of Servers	Percent
3.8-Build_3013	1	33.33%
3.8-Build_1080	1	33.33%
3.81-Build_1022	1	33.33%
Other	0	0.00%
ModusMail (2 servers)
Version	Number of Servers	Percent
4.1.361.21	2	100.00%
Other	0	0.00%
WebSTAR V (2 servers)
Version	Number of Servers	Percent
5.4.1	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%
MessageWall (1 servers)
Version	Number of Servers	Percent
1.0.8	1	100.00%
Other	0	0.00%
WebSTAR (1 servers)
Version	Number of Servers	Percent
Other	1	100.00%