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	1,864,101	100.0%
Number of Servers that didn't respond	340,632	18.27%
Server didn't open socket	331,118	17.76%
Server didn't provide banner	9,514	0.51%
Server provided banner	1,523,469	81.73%
Server banner identifies software in use	943,308	50.60%

As indicated by the above table, of the 1,864,101 servers queried, only 943,308 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	538,457	57.08%
Postfix	319,948	33.92%
Sendmail	40,237	4.27%
MailEnable	20,697	2.19%
MDaemon	9,255	0.98%
Microsoft	6,627	0.70%
IMail	1,748	0.19%
CommuniGate Pro	1,498	0.16%
XMail	904	0.10%
Lotus Domino	697	0.07%
WinWebMail	678	0.07%
SurgeSMTP	531	0.06%
Qmail Toaster	422	0.04%
Kerio	339	0.04%
OpenSMTPD	316	0.03%
Merak	228	0.02%
MagicMail	160	0.02%
ArGoSoft	152	0.02%
Post.Office	127	0.01%
GroupWise	78	0.01%
Gordano Messaging Suite (GMS)	62	0.01%
Trend Micro	58	0.01%
InterScan VirusWall	22	0.00%
VisNetic	17	0.00%
OpenVMS	12	0.00%
Mirapoint	8	0.00%
Mercury	8	0.00%
Interscan	6	0.00%
Neon Mail Server	5	0.00%
WebSTAR V	5	0.00%
MessageWall	3	0.00%
WebSTAR	2	0.00%
ModusMail	1	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (538,457 servers)
Version	Number of Servers	Percent
4.91	331,142	61.50%
4.89	98,327	18.26%
4.87	36,804	6.84%
4.90	14,482	2.69%
4.84	14,346	2.66%
4.80	6,109	1.13%
4.86	5,709	1.06%
Other	31,538	5.86%
Postfix (319,948 servers)
Version	Number of Servers	Percent
Other	319,948	100.00%
Sendmail (40,237 servers)
Version	Number of Servers	Percent
8.15.2	11,277	28.03%
8.14.4	8,728	21.69%
8.13.8	5,474	13.60%
8.13.1	3,494	8.68%
8.14.5	3,415	8.49%
8.14.7	2,164	5.38%
8.14.9	1,697	4.22%
8.14.3	1,040	2.58%
Other	2,948	7.33%
MailEnable (20,697 servers)
Version	Number of Servers	Percent
9.00--	2,418	11.68%
9.16--	2,060	9.95%
10.12--	1,305	6.31%
8.60--	766	3.70%
8.53--	739	3.57%
6.5--	583	2.82%
8.51--	509	2.46%
8.60-8.60-	367	1.77%
8.04--	356	1.72%
1.986--	349	1.69%
10.16--	305	1.47%
9.75--	301	1.45%
10.14--	263	1.27%
10.15--	247	1.19%
8.50--	234	1.13%
9.00--9.00	211	1.02%
Other	9,684	46.79%
MDaemon (9,255 servers)
Version	Number of Servers	Percent
18.0.2	624	6.74%
13.5.1	513	5.54%
13.6.3	447	4.83%
16.5.2	423	4.57%
11.0.0	375	4.05%
13.0.4	374	4.04%
11.0.3	364	3.93%
13.0.5	361	3.90%
18.0.1	339	3.66%
17.5.2	269	2.91%
17.5.3	218	2.36%
12.5.4	202	2.18%
16.0.4	192	2.07%
12.5.6	192	2.07%
18.0.0	181	1.96%
14.5.2	174	1.88%
15.0.3	163	1.76%
10.0.0	141	1.52%
16.5.1	139	1.50%
10.1.2	136	1.47%
17.5.1	134	1.45%
17.0.2	128	1.38%
16.0.1	105	1.13%
13.0.2	104	1.12%
10.1.0	102	1.10%
10.1.1	95	1.03%
Other	2,760	29.82%
Microsoft (6,627 servers)
Version	Number of Servers	Percent
6.0.3790.4675	3,524	53.18%
7.5.7601.17514	894	13.49%
8.5.9600.16384	723	10.91%
6.0.3790.3959	414	6.25%
8.0.9200.16384	179	2.70%
5.0.2195.5329	148	2.23%
10.0.14393.0	142	2.14%
7.0.6002.18264	118	1.78%
6.0.3790.1830	106	1.60%
5.0.2195.6713	71	1.07%
Other	308	4.65%
IMail (1,748 servers)
Version	Number of Servers	Percent
12.5.6.101	284	16.25%
8.22	182	10.41%
12.4.1.15	156	8.92%
12.5.5.115	136	7.78%
9.23	118	6.75%
12.5.3.93	100	5.72%
12.5.4.146	90	5.15%
12.3.0.100	85	4.86%
8.15	79	4.52%
11.03	53	3.03%
8.05	52	2.97%
11.5	32	1.83%
12.5.5.117	25	1.43%
7.07	24	1.37%
10.02	21	1.20%
7.15	20	1.14%
10.01	19	1.09%
Other	272	15.56%
CommuniGate Pro (1,498 servers)
Version	Number of Servers	Percent
6.1.16.	58	3.87%
6.1.16	39	2.60%
6.1.18	38	2.54%
6.0.11.	33	2.20%
5.3.13.	33	2.20%
6.1.18.	32	2.14%
6.1.11	32	2.14%
6.2.1	31	2.07%
5.4.11	29	1.94%
5.4.11.	26	1.74%
6.0.11	25	1.67%
6.1.19.	24	1.60%
6.2.5.	23	1.54%
5.2.20.	22	1.47%
6.2.4	22	1.47%
6.1.19	21	1.40%
6.1.10	20	1.34%
5.2.20	20	1.34%
6.1.11.	20	1.34%
5.1.16	19	1.27%
6.0.9	19	1.27%
6.2.0	18	1.20%
5.2.3	17	1.13%
5.1.16.	17	1.13%
6.2.3.	17	1.13%
6.2	16	1.07%
6.1.2.	16	1.07%
6.0.9.	16	1.07%
6.2.2	16	1.07%
Other	779	52.00%
XMail (904 servers)
Version	Number of Servers	Percent
1.27	406	44.91%
1.22	289	31.97%
1.25	64	7.08%
1.26	56	6.19%
1.24	34	3.76%
1.21	17	1.88%
1.23	11	1.22%
Other	27	2.99%
Lotus Domino (697 servers)
Version	Number of Servers	Percent
8.5.3FP6	137	19.66%
8.5.3	101	14.49%
8.5.2	33	4.73%
7.0.2	28	4.02%
8.5	23	3.30%
8.5.1	22	3.16%
8.5.3FP2	18	2.58%
8.5.3FP3	18	2.58%
7.0.3	17	2.44%
8.5.2FP4	15	2.15%
8.5.3FP4	15	2.15%
8.5.2FP3	14	2.01%
8.0.1	14	2.01%
8.5.3FP1	14	2.01%
8.0	13	1.87%
7.0	12	1.72%
8.5.2FP2	12	1.72%
6.5	10	1.43%
7.0.1	9	1.29%
8.5.1FP5	9	1.29%
6.5.4	8	1.15%
8.5.3FP5	8	1.15%
7.0.4	8	1.15%
8.0.2	8	1.15%
6.5.5	7	1.00%
6.5.1	7	1.00%
Other	117	16.79%
WinWebMail (678 servers)
Version	Number of Servers	Percent
3.9.0.7	148	21.83%
3.8.1.3	89	13.13%
3.9.0.1	51	7.52%
3.8.0.1	42	6.19%
3.7.6.1	34	5.01%
4.0.0.1	30	4.42%
3.8.1.5	27	3.98%
4.1.0.1	22	3.24%
3.9.5.3	20	2.95%
3.8.1.1	20	2.95%
3.8.5.1	19	2.80%
3.8.6.1	17	2.51%
3.9.3.1	16	2.36%
3.7.3.1	16	2.36%
4.2.0.1	15	2.21%
3.7.7.3	15	2.21%
3.8.2.1	13	1.92%
3.9.2.1	12	1.77%
3.8.3.1	11	1.62%
3.7.1.1	10	1.47%
3.9.5.1	10	1.47%
3.7.5.1	7	1.03%
Other	34	5.01%
SurgeSMTP (531 servers)
Version	Number of Servers	Percent
7.3e2-2	184	34.65%
7.1e-1	42	7.91%
6.5a2-2	33	6.21%
7.2i-1	25	4.71%
6.7c-1	23	4.33%
7.2a-1	21	3.95%
7.3i2-2	14	2.64%
7.2e-2	14	2.64%
6.9c-1	14	2.64%
7.0c2-2	14	2.64%
7.3c3-3	12	2.26%
3.9e-1	12	2.26%
6.5a-1	12	2.26%
5.2a-1	10	1.88%
7.3h-6	9	1.69%
6.1c-1	8	1.51%
6.4a-1	8	1.51%
4.0u4-4	7	1.32%
7.3j-4	6	1.13%
Other	63	11.86%
Qmail Toaster (422 servers)
Version	Number of Servers	Percent
1.3	310	73.46%
1.03	89	21.09%
1.2	8	1.90%
1.03.5	7	1.66%
1.03.6	5	1.18%
Other	3	0.71%
Kerio (339 servers)
Version	Number of Servers	Percent
6.7.3	68	20.06%
6.7.0	48	14.16%
6.6.2	35	10.32%
6.5.2	32	9.44%
6.7.2	25	7.37%
6.4.1	17	5.01%
6.6.1	16	4.72%
6.5.0	16	4.72%
6.7.1	13	3.83%
6.4.0	11	3.24%
6.3.1	11	3.24%
6.5.1	7	2.06%
6.3.0	6	1.77%
6.6.0	5	1.47%
6.1.3	4	1.18%
5.7.9	4	1.18%
Other	21	6.19%
OpenSMTPD (316 servers)
Version	Number of Servers	Percent
Other	316	100.00%
Merak (228 servers)
Version	Number of Servers	Percent
8.0.3	69	30.26%
8.9.1	44	19.30%
8.5.0	15	6.58%
7.5.2	11	4.82%
7.6.1	11	4.82%
7.4.5	11	4.82%
8.3.8	10	4.39%
7.6.4	7	3.07%
9.0.3	6	2.63%
7.4.2	4	1.75%
7.2.0	4	1.75%
4.2.1	3	1.32%
7.6.0	3	1.32%
7.0.1	3	1.32%
6.0.8	3	1.32%
Other	24	10.53%
MagicMail (160 servers)
Version	Number of Servers	Percent
Other	160	100.00%
ArGoSoft (152 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	55	36.18%
1.8 (1.8.9.3)	20	13.16%
1.8 (1.8.9.5)	19	12.50%
1.8 (1.8.9.1)	16	10.53%
1.8 (1.8.8.8)	5	3.29%
1.8 (1.8.7.3)	4	2.63%
1.8 (1.8.8.9)	4	2.63%
1.8 (1.8.9.2)	3	1.97%
1.8 (1.8.8.7)	3	1.97%
1.8 (1.8.6.0)	3	1.97%
1.8 (1.8.7.6)	2	1.32%
1.8 (1.8.8.4)	2	1.32%
1.8 (1.8.5.8)	2	1.32%
1.8 (1.8.9.4)	2	1.32%
1.8 (1.8.2.1)	2	1.32%
Other	10	6.58%
Post.Office (127 servers)
Version	Number of Servers	Percent
4.3	31	24.41%
4.2.2	25	19.69%
4.1.2.4	13	10.24%
3.5.3	11	8.66%
4.2.1.3	9	7.09%
4.4	5	3.94%
3.9.2.3	3	2.36%
4.1.1	3	2.36%
4.2.1.1	3	2.36%
3.5.1	3	2.36%
3.5.3J	3	2.36%
3.1.2	3	2.36%
3.8.7.4	2	1.57%
Other	13	10.24%
GroupWise (78 servers)
Version	Number of Servers	Percent
14.2.2	17	21.79%
18.0.1	9	11.54%
14.2.0	7	8.97%
14.2.1	6	7.69%
6.5.7	5	6.41%
14.2.3	5	6.41%
18.0.0	5	6.41%
14.0.1	4	5.13%
7.0.3	3	3.85%
8.0.3	2	2.56%
6.0.2	2	2.56%
6.0.4	2	2.56%
7.0.2	1	1.28%
6.5.0	1	1.28%
6.0.3	1	1.28%
6.5.5	1	1.28%
12.0.1	1	1.28%
7.0.1	1	1.28%
8.0.1	1	1.28%
14.0.0	1	1.28%
8.0.2	1	1.28%
14.0.2	1	1.28%
7.0.4	1	1.28%
Other	0	0.00%
Gordano Messaging Suite (GMS) (62 servers)
Version	Number of Servers	Percent
Other	62	100.00%
Trend Micro (58 servers)
Version	Number of Servers	Percent
5.7	20	34.48%
5.18	12	20.69%
5.5	8	13.79%
7.0	7	12.07%
7.5	5	8.62%
3.53	2	3.45%
7.1	1	1.72%
8.5	1	1.72%
8	1	1.72%
9.0	1	1.72%
Other	0	0.00%
InterScan VirusWall (22 servers)
Version	Number of Servers	Percent
Other	22	100.00%
VisNetic (17 servers)
Version	Number of Servers	Percent
9.3.2.0	6	35.29%
5.5.8.3	2	11.76%
5.0.2.3	2	11.76%
6.2.2.0	1	5.88%
8.0.3	1	5.88%
5.8.6.6	1	5.88%
9.1.4.0	1	5.88%
8.0.3.1	1	5.88%
5.0.2.0	1	5.88%
8.5.0.8	1	5.88%
Other	0	0.00%
OpenVMS (12 servers)
Version	Number of Servers	Percent
7.3	6	50.00%
8.4	4	33.33%
8.3	1	8.33%
8.2	1	8.33%
Other	0	0.00%
Mirapoint (8 servers)
Version	Number of Servers	Percent
4.4.2a-FCS	2	25.00%
4.3.5-GA	2	25.00%
4.4.3-GA	2	25.00%
3.10.10a-GA	1	12.50%
4.4.6-GA	1	12.50%
Other	0	0.00%
Mercury (8 servers)
Version	Number of Servers	Percent
3.32	4	50.00%
1.48	3	37.50%
3.21	1	12.50%
Other	0	0.00%
Interscan (6 servers)
Version	Number of Servers	Percent
3.81-Build_1022	2	33.33%
3.81-Build_1084	1	16.67%
3.8-Build_3013	1	16.67%
3.8-Build_1080	1	16.67%
3.5 (build 1294)	1	16.67%
Other	0	0.00%
Neon Mail Server (5 servers)
Version	Number of Servers	Percent
3.1.3	1	20.00%
3.0.7	1	20.00%
3.1.0	1	20.00%
3.1.5	1	20.00%
3.1.2	1	20.00%
Other	0	0.00%
WebSTAR V (5 servers)
Version	Number of Servers	Percent
5.4.1	4	80.00%
5.3.4	1	20.00%
Other	0	0.00%
MessageWall (3 servers)
Version	Number of Servers	Percent
1.0.8	3	100.00%
Other	0	0.00%
WebSTAR (2 servers)
Version	Number of Servers	Percent
Other	2	100.00%
ModusMail (1 servers)
Version	Number of Servers	Percent
4.1.361.21	1	100.00%
Other	0	0.00%