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	733,485	100.0%
Number of Servers that didn't respond	121,064	16.51%
Server didn't open socket	119,563	16.30%
Server didn't provide banner	1,501	0.20%
Server provided banner	612,421	83.49%
Server banner identifies software in use	409,255	55.80%

As indicated by the above table, of the 733,485 servers queried, only 409,255 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	241,702	59.06%
Postfix	141,917	34.68%
Sendmail	13,991	3.42%
MailEnable	7,421	1.81%
MDaemon	1,511	0.37%
Microsoft	689	0.17%
CommuniGate Pro	481	0.12%
OpenSMTPD	281	0.07%
XMail	277	0.07%
IMail	223	0.05%
SurgeSMTP	206	0.05%
Qmail Toaster	124	0.03%
MagicMail	102	0.02%
WinWebMail	69	0.02%
Lotus Domino	69	0.02%
Post.Office	45	0.01%
Merak	44	0.01%
Kerio	40	0.01%
ArGoSoft	26	0.01%
GroupWise	16	0.00%
OpenVMS	6	0.00%
Gordano Messaging Suite (GMS)	4	0.00%
VisNetic	3	0.00%
ModusMail	2	0.00%
Trend Micro	2	0.00%
Mercury	1	0.00%
WebSTAR	1	0.00%
Mirapoint	1	0.00%
InterScan VirusWall	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (241,702 servers)
Version	Number of Servers	Percent
4.96.2	145,756	60.30%
4.97.1	47,920	19.83%
4.96	10,250	4.24%
4.95	7,626	3.16%
4.93	6,579	2.72%
4.94.2	4,942	2.04%
4.96.1	3,342	1.38%
4.92	2,741	1.13%
Other	12,546	5.19%
Postfix (141,917 servers)
Version	Number of Servers	Percent
Other	141,917	100.00%
Sendmail (13,991 servers)
Version	Number of Servers	Percent
8.16.1	5,746	41.07%
8.15.2	3,510	25.09%
8.14.7	1,293	9.24%
8.14.4	1,107	7.91%
8.13.8	553	3.95%
8.14.5	321	2.29%
8.17.1	222	1.59%
8.18.1	212	1.52%
8.14.9	190	1.36%
Other	837	5.98%
MailEnable (7,421 servers)
Version	Number of Servers	Percent
10.46--	2,539	34.21%
10.48--	1,011	13.62%
10.34--	315	4.24%
10.43--	231	3.11%
10.27--	196	2.64%
10.25--	194	2.61%
10.47--	187	2.52%
10.48--10.48	132	1.78%
10.47--10.47	120	1.62%
10.43-10.43-	116	1.56%
10.42--	110	1.48%
10.47-10.47-	95	1.28%
10.48-10.48-	91	1.23%
9.00--	88	1.19%
9.00--9.00	80	1.08%
Other	1,916	25.82%
MDaemon (1,511 servers)
Version	Number of Servers	Percent
24.0.0	144	9.53%
23.5.3	127	8.41%
13.5.1	69	4.57%
13.0.5	57	3.77%
23.5.1	53	3.51%
11.0.3	51	3.38%
11.0.0	51	3.38%
23.5.2	47	3.11%
13.0.4	46	3.04%
21.5.4	41	2.71%
23.0.1	38	2.51%
16.5.2	37	2.45%
14.5.2	36	2.38%
23.5.0	35	2.32%
23.0.2	35	2.32%
19.5.4	30	1.99%
12.5.6	28	1.85%
22.0.3	22	1.46%
21.5.2	19	1.26%
19.5.5	16	1.06%
10.1.2	16	1.06%
Other	513	33.95%
Microsoft (689 servers)
Version	Number of Servers	Percent
6.0.3790.4675	168	24.38%
10.0.17763.1697	121	17.56%
10.0.14393.4169	97	14.08%
8.5.9600.16384	81	11.76%
7.5.7601.17514	47	6.82%
5.0.2195.5329	38	5.52%
6.0.3790.3959	37	5.37%
10.0.20348.1	14	2.03%
8.0.9200.16384	13	1.89%
5.0.2195.6713	11	1.60%
10.0.17763.1	9	1.31%
6.0.3790.1830	7	1.02%
Other	46	6.68%
CommuniGate Pro (481 servers)
Version	Number of Servers	Percent
6.2.15	44	9.15%
6.2.14	36	7.48%
6.4.1	29	6.03%
6.3.17	21	4.37%
6.1.20	16	3.33%
6.3.20	16	3.33%
6.3.18	14	2.91%
6.4.0	13	2.70%
6.0.9	11	2.29%
6.3.19	9	1.87%
6.0.11	9	1.87%
5.4.11	8	1.66%
6.1.16	8	1.66%
6.1.19	8	1.66%
7.1.8	8	1.66%
6.3.6	7	1.46%
6.1.18	7	1.46%
5.1.16	7	1.46%
6.3.14	6	1.25%
5.2.20	6	1.25%
5.1.7	6	1.25%
6.3.13	6	1.25%
6.3.15	5	1.04%
5.4.8	5	1.04%
6.2.12	5	1.04%
6.2.8	5	1.04%
Other	166	34.51%
OpenSMTPD (281 servers)
Version	Number of Servers	Percent
Other	281	100.00%
XMail (277 servers)
Version	Number of Servers	Percent
1.27	178	64.26%
1.22	63	22.74%
1.26	10	3.61%
1.25	10	3.61%
1.24	4	1.44%
1.15	4	1.44%
Other	8	2.89%
IMail (223 servers)
Version	Number of Servers	Percent
12.6.1.4	34	15.25%
12.5.8.41	15	6.73%
12.5.8.59	15	6.73%
9.23	14	6.28%
12.5.6.101	14	6.28%
12.5.3.93	12	5.38%
12.5.7.59	11	4.93%
12.5.8.58	10	4.48%
12.5.6.105	10	4.48%
8.05	9	4.04%
12.4.1.15	8	3.59%
8.22	6	2.69%
12.6.0.20	5	2.24%
8.15	5	2.24%
12.6.0.17	5	2.24%
11.5	5	2.24%
12.5.4.146	4	1.79%
10.02	4	1.79%
12.3.0.100	4	1.79%
12.5.8.54	3	1.35%
6.04	3	1.35%
12.5.5.115	3	1.35%
5.05	3	1.35%
12.5.5.117	3	1.35%
8.00	3	1.35%
Other	15	6.73%
SurgeSMTP (206 servers)
Version	Number of Servers	Percent
7.8a-1	39	18.93%
7.3o4-4	18	8.74%
7.7c-1	16	7.77%
7.7i-1	12	5.83%
7.6j-1	12	5.83%
7.3e2-2	11	5.34%
7.5c-1	9	4.37%
7.5a-1	6	2.91%
7.1e-1	6	2.91%
7.4e-1	6	2.91%
6.9c-1	6	2.91%
7.4o-1	5	2.43%
6.5a2-2	5	2.43%
7.6s-1	5	2.43%
7.6u-1	4	1.94%
7.8b-2	4	1.94%
6.7c-1	4	1.94%
7.6d-1	4	1.94%
7.7h-3	3	1.46%
Other	31	15.05%
Qmail Toaster (124 servers)
Version	Number of Servers	Percent
1.03	72	58.06%
1.3	48	38.71%
1.03.5	3	2.42%
Other	1	0.81%
MagicMail (102 servers)
Version	Number of Servers	Percent
Other	102	100.00%
WinWebMail (69 servers)
Version	Number of Servers	Percent
3.9.0.7	12	17.39%
4.4.0.1	12	17.39%
4.5.0.1	12	17.39%
4.2.0.1	8	11.59%
3.8.1.3	6	8.70%
4.3.0.1	3	4.35%
3.8.5.1	2	2.90%
3.8.0.1	2	2.90%
4.0.0.1	2	2.90%
3.8.6.1	2	2.90%
3.7.3.1	2	2.90%
1.0	1	1.45%
3.7.6.1	1	1.45%
3.9.3.1	1	1.45%
3.7.7.3	1	1.45%
4.1.0.1	1	1.45%
3.7.5.1	1	1.45%
Other	0	0.00%
Lotus Domino (69 servers)
Version	Number of Servers	Percent
8.5.3	14	20.29%
8.5.3FP6	12	17.39%
7.0	4	5.80%
7.0.3	4	5.80%
8.5.2FP1	2	2.90%
8.5.3FP1	2	2.90%
8.5	2	2.90%
6.5.1	2	2.90%
8.5.2FP2	2	2.90%
8.5.2	2	2.90%
8.0.1	2	2.90%
6.5.3	2	2.90%
7.5.1	2	2.90%
7.0.2	2	2.90%
8.5.3FP6HF1215	1	1.45%
6.5.4	1	1.45%
6.0.1	1	1.45%
6.5	1	1.45%
5.0.8	1	1.45%
7.0.4FP2	1	1.45%
8.5.3FP5	1	1.45%
7.0.4FP1	1	1.45%
8.0	1	1.45%
8.5.2FP4	1	1.45%
6.6.6	1	1.45%
6.5.2	1	1.45%
7.0.3FP1	1	1.45%
8.5.1	1	1.45%
5.0.13	1	1.45%
Other	0	0.00%
Post.Office (45 servers)
Version	Number of Servers	Percent
4.4	24	53.33%
4.2.2	8	17.78%
3.5.3	3	6.67%
4.3	3	6.67%
4.1.2.4	3	6.67%
3.9.2	2	4.44%
4.2	1	2.22%
3.1.2	1	2.22%
Other	0	0.00%
Merak (44 servers)
Version	Number of Servers	Percent
8.9.1	12	27.27%
8.0.3	9	20.45%
7.6.1	7	15.91%
8.3.8	4	9.09%
8.0.1	1	2.27%
8.9.2	1	2.27%
8.3.6	1	2.27%
6.1.0	1	2.27%
7.4.5	1	2.27%
9.0.3	1	2.27%
8.5.0	1	2.27%
4.2.1	1	2.27%
7.6.0	1	2.27%
7.4.4	1	2.27%
6.0.8	1	2.27%
5.8.2	1	2.27%
Other	0	0.00%
Kerio (40 servers)
Version	Number of Servers	Percent
6.7.3	9	22.50%
6.6.1	7	17.50%
6.7.0	6	15.00%
6.7.1	4	10.00%
6.5.2	3	7.50%
6.6.2	3	7.50%
5.7.9	2	5.00%
6.5.1	2	5.00%
6.4.1	1	2.50%
6.0.10	1	2.50%
6.0.8	1	2.50%
6.7.2	1	2.50%
Other	0	0.00%
ArGoSoft (26 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	8	30.77%
1.8 (1.8.9.3)	4	15.38%
1.8 (1.8.9.5)	3	11.54%
1.8 (1.8.8.8)	2	7.69%
1.8 (1.8.7.3)	2	7.69%
1.8 (1.8.8.7)	2	7.69%
1.8 (1.8.9.2)	2	7.69%
1.8 (1.8.6.0)	1	3.85%
1.8 (1.8.9.1)	1	3.85%
1.8 (1.8.9.4)	1	3.85%
Other	0	0.00%
GroupWise (16 servers)
Version	Number of Servers	Percent
24.2.0	3	18.75%
18.3.1	3	18.75%
18.5.0	2	12.50%
14.2.1	1	6.25%
18.1.1	1	6.25%
14.2.3	1	6.25%
6.5.0	1	6.25%
18.4.1	1	6.25%
23.4.0	1	6.25%
14.2.2	1	6.25%
18.0.2	1	6.25%
Other	0	0.00%
OpenVMS (6 servers)
Version	Number of Servers	Percent
8.4	3	50.00%
7.3	2	33.33%
8.2	1	16.67%
Other	0	0.00%
Gordano Messaging Suite (GMS) (4 servers)
Version	Number of Servers	Percent
Other	4	100.00%
VisNetic (3 servers)
Version	Number of Servers	Percent
9.3.2.0	2	66.67%
8.0.3	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%
Trend Micro (2 servers)
Version	Number of Servers	Percent
5.18	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%
InterScan VirusWall (1 servers)
Version	Number of Servers	Percent
Other	1	100.00%