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	1,398,031	100.0%
Number of Servers that didn't respond	302,026	21.60%
Server didn't open socket	298,162	21.33%
Server didn't provide banner	3,864	0.28%
Server provided banner	1,096,005	78.40%
Server banner identifies software in use	707,684	50.62%

As indicated by the above table, of the 1,398,031 servers queried, only 707,684 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	398,853	56.36%
Postfix	260,309	36.78%
Sendmail	24,644	3.48%
MailEnable	13,312	1.88%
MDaemon	3,734	0.53%
Microsoft	2,073	0.29%
CommuniGate Pro	923	0.13%
IMail	711	0.10%
OpenSMTPD	589	0.08%
XMail	533	0.08%
Qmail Toaster	508	0.07%
SurgeSMTP	393	0.06%
WinWebMail	254	0.04%
Lotus Domino	214	0.03%
MagicMail	159	0.02%
Kerio	107	0.02%
Merak	90	0.01%
Post.Office	84	0.01%
ArGoSoft	54	0.01%
GroupWise	51	0.01%
Gordano Messaging Suite (GMS)	41	0.01%
OpenVMS	10	0.00%
Trend Micro	10	0.00%
InterScan VirusWall	7	0.00%
VisNetic	6	0.00%
Mercury	4	0.00%
ModusMail	2	0.00%
Interscan	2	0.00%
MessageWall	2	0.00%
WebSTAR V	2	0.00%
WebSTAR	1	0.00%
Mirapoint	1	0.00%
Neon Mail Server	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (398,853 servers)
Version	Number of Servers	Percent
4.95	282,941	70.94%
4.94.2	38,740	9.71%
4.93	22,562	5.66%
4.96	12,829	3.22%
4.92	6,816	1.71%
4.94	4,981	1.25%
4.91	4,652	1.17%
Other	25,332	6.35%
Postfix (260,309 servers)
Version	Number of Servers	Percent
Other	260,309	100.00%
Sendmail (24,644 servers)
Version	Number of Servers	Percent
8.15.2	12,027	48.80%
8.14.7	3,279	13.31%
8.14.4	2,973	12.06%
8.13.8	1,338	5.43%
8.16.1	1,300	5.28%
8.14.5	1,244	5.05%
8.13.1	410	1.66%
8.17.1	402	1.63%
8.14.9	378	1.53%
8.14.3	256	1.04%
Other	1,037	4.21%
MailEnable (13,312 servers)
Version	Number of Servers	Percent
10.34--	5,488	41.23%
10.27--	694	5.21%
10.25--	579	4.35%
9.00--	351	2.64%
10.37--	327	2.46%
10.39--	229	1.72%
10.31-10.31-	211	1.59%
10.31--	202	1.52%
10.40--	141	1.06%
10.39--10.39	140	1.05%
10.29--	137	1.03%
Other	4,813	36.16%
MDaemon (3,734 servers)
Version	Number of Servers	Percent
21.5.2	305	8.17%
22.0.2	256	6.86%
13.5.1	240	6.43%
13.0.5	153	4.10%
13.0.4	138	3.70%
19.5.4	130	3.48%
11.0.3	128	3.43%
22.0.1	127	3.40%
11.0.0	120	3.21%
22.0.0	105	2.81%
16.5.2	90	2.41%
19.5.5	86	2.30%
21.0.3	84	2.25%
21.5.1	79	2.12%
12.5.6	75	2.01%
14.5.2	72	1.93%
21.0.1	48	1.29%
10.0.0	47	1.26%
12.5.4	44	1.18%
15.0.3	39	1.04%
21.5.0	39	1.04%
21.0.2	38	1.02%
Other	1,291	34.57%
Microsoft (2,073 servers)
Version	Number of Servers	Percent
6.0.3790.4675	636	30.68%
8.5.9600.16384	322	15.53%
10.0.17763.1697	218	10.52%
10.0.14393.4169	213	10.27%
7.5.7601.17514	174	8.39%
6.0.3790.3959	117	5.64%
5.0.2195.5329	78	3.76%
8.0.9200.16384	61	2.94%
5.0.2195.6713	32	1.54%
6.0.3790.1830	30	1.45%
7.0.6002.18264	25	1.21%
10.0.17763.1	24	1.16%
5.0.2195.7381	21	1.01%
Other	122	5.89%
CommuniGate Pro (923 servers)
Version	Number of Servers	Percent
6.2.15	105	11.38%
6.2.14	86	9.32%
6.1.20	43	4.66%
6.3.13	31	3.36%
6.0.11	28	3.03%
5.2.20	23	2.49%
6.3.14	21	2.28%
6.1.16	20	2.17%
6.2.12	19	2.06%
5.4.11	18	1.95%
6.0.9	16	1.73%
6.1.18	16	1.73%
5.1.16	15	1.63%
6.3.6	15	1.63%
7.1.2	14	1.52%
6.3.11	14	1.52%
7.1.1	12	1.30%
6.3.5	12	1.30%
6.3.10	11	1.19%
6.1.11	10	1.08%
6.2.10	10	1.08%
Other	384	41.60%
IMail (711 servers)
Version	Number of Servers	Percent
12.5.8.41	88	12.38%
12.5.6.101	59	8.30%
12.5.7.59	52	7.31%
12.5.8.58	50	7.03%
9.23	48	6.75%
12.4.1.15	39	5.49%
12.5.5.115	29	4.08%
8.22	28	3.94%
12.5.3.93	28	3.94%
8.05	26	3.66%
12.5.8.54	24	3.38%
12.5.6.105	24	3.38%
12.5.8.59	21	2.95%
10.02	18	2.53%
12.6.0.17	17	2.39%
12.5.4.146	15	2.11%
8.15	14	1.97%
12.3.0.100	14	1.97%
12.5.5.117	13	1.83%
11.03	9	1.27%
Other	95	13.36%
OpenSMTPD (589 servers)
Version	Number of Servers	Percent
Other	589	100.00%
XMail (533 servers)
Version	Number of Servers	Percent
1.27	304	57.04%
1.22	152	28.52%
1.26	22	4.13%
1.25	21	3.94%
1.24	15	2.81%
Other	19	3.56%
Qmail Toaster (508 servers)
Version	Number of Servers	Percent
1.3	349	68.70%
1.03	149	29.33%
1.03.5	6	1.18%
Other	4	0.79%
SurgeSMTP (393 servers)
Version	Number of Servers	Percent
7.6j-1	72	18.32%
7.3o4-4	44	11.20%
7.5c-1	28	7.12%
7.3e2-2	21	5.34%
7.6h-2	20	5.09%
7.4o-1	16	4.07%
7.5a-1	16	4.07%
7.1e-1	14	3.56%
7.6m-1	13	3.31%
7.6d-1	12	3.05%
7.4e-1	12	3.05%
7.3i2-2	10	2.54%
6.5a2-2	10	2.54%
6.7c-1	7	1.78%
7.2i-1	6	1.53%
7.4m-1	5	1.27%
7.2a-1	5	1.27%
7.6q-1	5	1.27%
6.9c-1	4	1.02%
3.9e-1	4	1.02%
5.0e4-4	4	1.02%
6.5a-1	4	1.02%
Other	61	15.52%
WinWebMail (254 servers)
Version	Number of Servers	Percent
4.2.0.1	41	16.14%
4.4.0.1	37	14.57%
3.9.0.7	28	11.02%
3.8.1.3	21	8.27%
4.3.0.1	21	8.27%
3.9.0.1	18	7.09%
3.8.0.1	13	5.12%
3.7.3.1	10	3.94%
3.8.1.5	9	3.54%
4.1.0.1	8	3.15%
4.0.0.1	7	2.76%
3.8.6.1	6	2.36%
3.7.7.3	5	1.97%
3.8.5.1	4	1.57%
3.8.1.1	4	1.57%
3.9.3.1	3	1.18%
3.7.1.1	3	1.18%
Other	16	6.30%
Lotus Domino (214 servers)
Version	Number of Servers	Percent
8.5.3FP6	45	21.03%
8.5.3	31	14.49%
8.5.2	10	4.67%
7.0	8	3.74%
8.5.1	8	3.74%
7.0.3	7	3.27%
8.5	7	3.27%
8.5.2FP2	6	2.80%
6.5	5	2.34%
8.5.3FP3	5	2.34%
7.0.2	5	2.34%
8.5.3FP5	4	1.87%
8.5.3FP1	4	1.87%
6.5.3	4	1.87%
8.0	4	1.87%
6.5.1	4	1.87%
7.0.3FP1	4	1.87%
8.5.2FP1	3	1.40%
8.5.1FP5	3	1.40%
8.5.3FP4	3	1.40%
6.5.4	3	1.40%
8.0.1	3	1.40%
8.5.2FP3	3	1.40%
Other	35	16.36%
MagicMail (159 servers)
Version	Number of Servers	Percent
Other	159	100.00%
Kerio (107 servers)
Version	Number of Servers	Percent
6.7.3	24	22.43%
6.7.0	15	14.02%
6.6.2	11	10.28%
6.6.1	11	10.28%
6.7.1	8	7.48%
6.5.2	8	7.48%
6.7.2	7	6.54%
6.5.0	5	4.67%
6.4.1	3	2.80%
6.3.1	3	2.80%
5.7.9	2	1.87%
6.3.0	2	1.87%
6.0.5	2	1.87%
6.5.1	2	1.87%
Other	4	3.74%
Merak (90 servers)
Version	Number of Servers	Percent
8.9.1	24	26.67%
8.0.3	22	24.44%
7.6.1	8	8.89%
9.0.3	5	5.56%
7.4.5	4	4.44%
8.3.8	4	4.44%
7.6.4	2	2.22%
8.5.0	2	2.22%
7.0.1	2	2.22%
6.0.8	2	2.22%
8.0.1	1	1.11%
7.4.2	1	1.11%
8.9.2	1	1.11%
8.3.6	1	1.11%
6.1.0	1	1.11%
6.2.1	1	1.11%
7.5.2	1	1.11%
8.3.0	1	1.11%
4.2.1	1	1.11%
8.9.7	1	1.11%
7.6.0	1	1.11%
7.4.4	1	1.11%
6.0.7	1	1.11%
8.9.0	1	1.11%
5.8.2	1	1.11%
Other	0	0.00%
Post.Office (84 servers)
Version	Number of Servers	Percent
4.4	31	36.90%
4.3	15	17.86%
4.2.2	13	15.48%
3.5.3	6	7.14%
4.1.2.4	5	5.95%
3.5.1	3	3.57%
3.9.2	2	2.38%
4.2	2	2.38%
4.2.1.3	2	2.38%
4.1.1	1	1.19%
3.5.3J	1	1.19%
4.1	1	1.19%
3.1.2	1	1.19%
4.2.1.1	1	1.19%
Other	0	0.00%
ArGoSoft (54 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	15	27.78%
1.8 (1.8.9.3)	9	16.67%
1.8 (1.8.9.5)	6	11.11%
1.8 (1.8.8.8)	3	5.56%
1.8 (1.8.9.1)	3	5.56%
1.8 (1.8.7.3)	2	3.70%
1.8 (1.8.8.9)	2	3.70%
1.8 (1.8.8.7)	2	3.70%
1.8 (1.8.7.6)	2	3.70%
1.8 (1.8.5.8)	1	1.85%
1.8 (1.8.8.4)	1	1.85%
1.8 (1.8.6.0)	1	1.85%
1.8 (1.8.1.7)	1	1.85%
1.8 (1.8.9.4)	1	1.85%
1.8 (1.8.3.5)	1	1.85%
1.8 (1.8.2.1)	1	1.85%
1.8 (1.8.9.2)	1	1.85%
1.8 (1.8.5.9)	1	1.85%
1.8 (1.8.2.5)	1	1.85%
Other	0	0.00%
GroupWise (51 servers)
Version	Number of Servers	Percent
18.3.1	14	27.45%
18.2.1	6	11.76%
18.4.0	6	11.76%
18.1.1	4	7.84%
18.1.0	4	7.84%
14.2.2	3	5.88%
18.2.0	2	3.92%
14.0.0	2	3.92%
14.2.1	1	1.96%
18.4.1	1	1.96%
18.0.0	1	1.96%
6.5.0	1	1.96%
14.2.0	1	1.96%
18.3.0	1	1.96%
8.0.3	1	1.96%
14.2.3	1	1.96%
18.0.2	1	1.96%
6.0.4	1	1.96%
Other	0	0.00%
Gordano Messaging Suite (GMS) (41 servers)
Version	Number of Servers	Percent
Other	41	100.00%
OpenVMS (10 servers)
Version	Number of Servers	Percent
8.4	5	50.00%
7.3	4	40.00%
8.2	1	10.00%
Other	0	0.00%
Trend Micro (10 servers)
Version	Number of Servers	Percent
5.18	4	40.00%
5.7	3	30.00%
5.5	2	20.00%
7.0	1	10.00%
Other	0	0.00%
InterScan VirusWall (7 servers)
Version	Number of Servers	Percent
Other	7	100.00%
VisNetic (6 servers)
Version	Number of Servers	Percent
9.3.2.0	3	50.00%
8.0.3	1	16.67%
6.2.2.0	1	16.67%
5.0.1	1	16.67%
Other	0	0.00%
Mercury (4 servers)
Version	Number of Servers	Percent
1.48	2	50.00%
4.x	1	25.00%
4	1	25.00%
Other	0	0.00%
ModusMail (2 servers)
Version	Number of Servers	Percent
4.1.361.21	2	100.00%
Other	0	0.00%
Interscan (2 servers)
Version	Number of Servers	Percent
3.8-Build_3013	1	50.00%
3.81-Build_1022	1	50.00%
Other	0	0.00%
MessageWall (2 servers)
Version	Number of Servers	Percent
1.0.8	2	100.00%
Other	0	0.00%
WebSTAR V (2 servers)
Version	Number of Servers	Percent
5.4.1	1	50.00%
5.3.2	1	50.00%
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%
Neon Mail Server (1 servers)
Version	Number of Servers	Percent
3.1.2	1	100.00%
Other	0	0.00%