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	2,495,673	100.0%
Number of Servers that didn't respond	448,478	17.97%
Server didn't open socket	437,707	17.54%
Server didn't provide banner	10,771	0.43%
Server provided banner	2,047,195	82.03%
Server banner identifies software in use	1,136,518	45.54%

As indicated by the above table, of the 2,495,673 servers queried, only 1,136,518 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	561,378	49.39%
Postfix	320,854	28.23%
Sendmail	108,306	9.53%
Microsoft	67,907	5.98%
MailEnable	32,493	2.86%
MDaemon	20,385	1.79%
IMail	6,140	0.54%
Lotus Domino	3,865	0.34%
CommuniGate Pro	3,003	0.26%
WinWebMail	2,844	0.25%
XMail	1,999	0.18%
Qmail Toaster	1,489	0.13%
Kerio	1,253	0.11%
SurgeSMTP	991	0.09%
Merak	968	0.09%
ArGoSoft	580	0.05%
Post.Office	334	0.03%
GroupWise	330	0.03%
MagicMail	311	0.03%
Gordano Messaging Suite (GMS)	286	0.03%
Trend Micro	254	0.02%
Mirapoint	106	0.01%
InterScan VirusWall	102	0.01%
VisNetic	85	0.01%
OpenSMTPD	67	0.01%
Mercury	39	0.00%
Interscan	30	0.00%
OpenVMS	23	0.00%
NetIQ MailMarshal	22	0.00%
WebSTAR V	22	0.00%
Neon Mail Server	16	0.00%
MessageWall	11	0.00%
WebSTAR	11	0.00%
ModusMail	10	0.00%
MAILsweeper	4	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (561,378 servers)
Version	Number of Servers	Percent
4.80.1	345,944	61.62%
4.80	117,432	20.92%
4.72	20,076	3.58%
4.76	17,432	3.11%
4.69	15,476	2.76%
4.82	12,700	2.26%
4.77	12,169	2.17%
Other	20,149	3.59%
Postfix (320,854 servers)
Version	Number of Servers	Percent
Other	320,854	100.00%
Sendmail (108,306 servers)
Version	Number of Servers	Percent
8.13.8	27,742	25.61%
8.13.1	14,867	13.73%
8.14.4	14,679	13.55%
8.14.3	14,382	13.28%
8.14.5	13,742	12.69%
8.12.11.20060308	3,510	3.24%
8.13.6.20060614	2,981	2.75%
8.14.2	2,272	2.10%
8.11.6	1,625	1.50%
8.14.7	1,480	1.37%
8.12.10	1,471	1.36%
8.14.1	1,376	1.27%
8.13.6	1,194	1.10%
Other	6,985	6.45%
Microsoft (67,907 servers)
Version	Number of Servers	Percent
6.0.3790.4675	54,564	80.35%
6.0.3790.3959	6,390	9.41%
7.5.7601.17514	2,237	3.29%
6.0.3790.1830	1,700	2.50%
Other	3,016	4.44%
MailEnable (32,493 servers)
Version	Number of Servers	Percent
1.986--	4,281	13.18%
6.5--	2,453	7.55%
5.10--	1,939	5.97%
4.26--	1,480	4.55%
6.0--	1,279	3.94%
7.06--	883	2.72%
1.981--	816	2.51%
7.50--	667	2.05%
7.07--	637	1.96%
7.0--	566	1.74%
6.70--	545	1.68%
6.57--	528	1.62%
6.03--	501	1.54%
7.09--	491	1.51%
1.983--	464	1.43%
3.62--	426	1.31%
0-6.83-	390	1.20%
0-3.65-	358	1.10%
5.51--	343	1.06%
Other	13,446	41.38%
MDaemon (20,385 servers)
Version	Number of Servers	Percent
13.6.0	2,098	10.29%
13.5.2	1,668	8.18%
11.0.3	1,492	7.32%
13.0.4	1,208	5.93%
11.0.0	1,164	5.71%
13.0.5	1,126	5.52%
13.5.1	779	3.82%
13.0.3	697	3.42%
10.0.0	651	3.19%
12.5.6	605	2.97%
10.1.2	537	2.63%
10.1.1	527	2.59%
13.0.2	424	2.08%
12.5.4	393	1.93%
9.6.1	382	1.87%
9.6.6	356	1.75%
10.1.0	344	1.69%
9.6.2	268	1.31%
9.5.2	236	1.16%
12.5.8	215	1.05%
10.0.2	213	1.04%
12.0.3	210	1.03%
10.0.5	209	1.03%
Other	4,583	22.48%
IMail (6,140 servers)
Version	Number of Servers	Percent
8.22	996	16.22%
12.3.0.100	843	13.73%
12.2.0.235	691	11.25%
11.5	420	6.84%
8.15	347	5.65%
9.23	346	5.64%
11.03	250	4.07%
8.05	247	4.02%
10.02	193	3.14%
12.1.0.270	160	2.61%
11.01	148	2.41%
11.02	135	2.20%
7.07	131	2.13%
6.06	111	1.81%
7.15	108	1.76%
12.2.0.169	105	1.71%
8.00	98	1.60%
10.01	91	1.48%
11.0	67	1.09%
Other	653	10.64%
Lotus Domino (3,865 servers)
Version	Number of Servers	Percent
8.5.3	631	16.33%
8.5.3FP3	238	6.16%
8.5.2	207	5.36%
8.5.3FP2	190	4.92%
8.5.3FP4	183	4.73%
8.5.1	161	4.17%
7.0.2	145	3.75%
8.5.2FP2	143	3.70%
8.5.3FP1	135	3.49%
8.5.3FP5	124	3.21%
8.5	112	2.90%
8.5.2FP3	106	2.74%
8.5.2FP4	91	2.35%
7.0.3	74	1.91%
8.5.1FP5	73	1.89%
7.0	65	1.68%
8.0.1	63	1.63%
6.5.3	61	1.58%
8.0.2	60	1.55%
7.0.1	59	1.53%
6.5.1	59	1.53%
8.5.2FP1	58	1.50%
6.5.4	54	1.40%
6.5.5	51	1.32%
8.0	49	1.27%
6.5	40	1.03%
Other	633	16.38%
CommuniGate Pro (3,003 servers)
Version	Number of Servers	Percent
5.1.16	287	9.56%
6.0.7	184	6.13%
6.0.5	153	5.09%
5.2.20	109	3.63%
4.1.8	103	3.43%
5.4.10	93	3.10%
6.0.6	81	2.70%
5.3.13	76	2.53%
5.4.8	67	2.23%
6.0.1	65	2.16%
5.4.4	64	2.13%
5.3.15	63	2.10%
4.2.10	62	2.06%
5.4.6	61	2.03%
5.0.14	57	1.90%
5.1.12	54	1.80%
5.4.1	53	1.76%
5.2.19	52	1.73%
6.0.4	48	1.60%
5.2.16	48	1.60%
5.2.3	47	1.57%
5.4.5	43	1.43%
5.4.0	36	1.20%
5.2.14	34	1.13%
5.4.2	33	1.10%
5.4.7	31	1.03%
Other	999	33.27%
WinWebMail (2,844 servers)
Version	Number of Servers	Percent
3.8.1.3	538	18.92%
3.8.0.1	327	11.50%
3.7.6.1	266	9.35%
3.8.5.1	235	8.26%
3.8.1.5	225	7.91%
3.8.1.1	189	6.65%
3.7.3.1	173	6.08%
3.8.6.1	160	5.63%
3.7.7.3	149	5.24%
3.8.2.1	131	4.61%
3.7.1.1	86	3.02%
3.7.5.1	65	2.29%
3.8.3.1	63	2.22%
3.8.3.3	53	1.86%
3.6.3.1	39	1.37%
3.7.0.5	35	1.23%
3.7.0.3	32	1.13%
Other	78	2.74%
XMail (1,999 servers)
Version	Number of Servers	Percent
1.27	643	32.17%
1.22	498	24.91%
1.25	289	14.46%
1.26	205	10.26%
1.24	129	6.45%
1.21	65	3.25%
1.23	37	1.85%
1.17	31	1.55%
1.20	22	1.10%
Other	80	4.00%
Qmail Toaster (1,489 servers)
Version	Number of Servers	Percent
1.3	1,416	95.10%
1.2	41	2.75%
Other	32	2.15%
Kerio (1,253 servers)
Version	Number of Servers	Percent
6.7.3	219	17.48%
6.7.0	125	9.98%
6.6.2	121	9.66%
6.5.0	100	7.98%
6.5.2	86	6.86%
6.7.2	76	6.07%
6.4.1	71	5.67%
6.7.1	59	4.71%
6.3.1	59	4.71%
6.6.1	49	3.91%
6.4.0	46	3.67%
6.5.1	40	3.19%
6.3.0	29	2.31%
6.4.2	29	2.31%
6.6.0	28	2.23%
6.0.10	17	1.36%
Other	99	7.90%
SurgeSMTP (991 servers)
Version	Number of Servers	Percent
6.3c2-2	201	20.28%
6.4a-1	150	15.14%
6.5a-1	99	9.99%
5.2a-1	53	5.35%
6.1c-1	52	5.25%
5.3h2-2	51	5.15%
3.9e-1	38	3.83%
6.0a5-5	23	2.32%
3.8k4-4	20	2.02%
4.0u4-4	17	1.72%
5.0e4-4	15	1.51%
4.2d2-2	14	1.41%
6.0a4-4	12	1.21%
6.5b-24	11	1.11%
3.8i3-3	11	1.11%
3.9h-18	11	1.11%
4.2d4-4	10	1.01%
4.2a3-3	10	1.01%
Other	193	19.48%
Merak (968 servers)
Version	Number of Servers	Percent
8.0.3	364	37.60%
8.9.1	111	11.47%
8.5.0	65	6.71%
8.3.8	51	5.27%
7.5.2	48	4.96%
7.4.5	40	4.13%
7.6.4	40	4.13%
7.0.1	19	1.96%
7.6.1	17	1.76%
7.4.2	15	1.55%
7.2.0	14	1.45%
7.6.0	13	1.34%
9.0.0	13	1.34%
8.3.15	13	1.34%
8.9.0	12	1.24%
6.2.1	12	1.24%
8.2.4	11	1.14%
4.4.2	10	1.03%
Other	100	10.33%
ArGoSoft (580 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	150	25.86%
1.8 (1.8.9.5)	81	13.97%
1.8 (1.8.9.3)	70	12.07%
1.8 (1.8.9.1)	68	11.72%
1.8 (1.8.8.7)	37	6.38%
1.8 (1.8.8.8)	34	5.86%
1.8 (1.8.9.2)	22	3.79%
1.8 (1.8.9.4)	17	2.93%
1.8 (1.8.6.0)	11	1.90%
1.8 (1.8.8.9)	10	1.72%
1.8 (1.8.8.1)	6	1.03%
Other	74	12.76%
Post.Office (334 servers)
Version	Number of Servers	Percent
3.5.3	44	13.17%
4.1.2.4	34	10.18%
4.1.0.2	28	8.38%
4.2.2	19	5.69%
4.0.1	18	5.39%
4.1.1	14	4.19%
3.9.2.3	13	3.89%
3.5.3J	12	3.59%
4.2	11	3.29%
4.1.0.3	9	2.69%
3.9.2	9	2.69%
4.1.0.4	8	2.40%
3.1.2J	7	2.10%
4.2.1.3	7	2.10%
3.8.3	7	2.10%
4.2.1.1	7	2.10%
3.1.2	6	1.80%
3.9.1	6	1.80%
3.9.1.2	5	1.50%
4.1.2.3	5	1.50%
3.6.2	5	1.50%
3.5.4	4	1.20%
4.0.1.1	4	1.20%
4.1	4	1.20%
3.9.1.3	4	1.20%
3.8.7.4	4	1.20%
3.9.2.2	4	1.20%
4.1.2.2	4	1.20%
3.5.1	4	1.20%
Other	28	8.38%
GroupWise (330 servers)
Version	Number of Servers	Percent
7.0.3	55	16.67%
8.0.2	46	13.94%
6.5.7	44	13.33%
7.0.4	26	7.88%
8.0.3	23	6.97%
7.0.2	22	6.67%
6.5.6	17	5.15%
12.0.2	15	4.55%
6.5.4	12	3.64%
7.0.1	11	3.33%
12.0.1	8	2.42%
6.0.4	8	2.42%
8.0.1	7	2.12%
7.0	5	1.52%
8.0.0	5	1.52%
6.5.5	5	1.52%
Other	21	6.36%
MagicMail (311 servers)
Version	Number of Servers	Percent
Other	311	100.00%
Gordano Messaging Suite (GMS) (286 servers)
Version	Number of Servers	Percent
Other	286	100.00%
Trend Micro (254 servers)
Version	Number of Servers	Percent
5.7	98	38.58%
5.5	58	22.83%
5.18	44	17.32%
7.0	25	9.84%
7.1	15	5.91%
8.5	3	1.18%
3.53	3	1.18%
Other	8	3.15%
Mirapoint (106 servers)
Version	Number of Servers	Percent
4.3.5-GA	14	13.21%
3.10.10a-GA	13	12.26%
4.3.6-GA	9	8.49%
4.2.3-GA	8	7.55%
4.4.3-GA	8	7.55%
4.4.2a-FCS	6	5.66%
4.1.9-GA	5	4.72%
4.1.10-GA	5	4.72%
3.10.8-GA	4	3.77%
4.2.4-GA	4	3.77%
3.10.9-GA	3	2.83%
4.1.5-GA	3	2.83%
4.1.3-GA	2	1.89%
3.10.4-GA	2	1.89%
3.8.4-GA	2	1.89%
4.3.3-GA	2	1.89%
4.3.7-GA	2	1.89%
3.8.3-GA	2	1.89%
3.8.5-GA	2	1.89%
Other	10	9.43%
InterScan VirusWall (102 servers)
Version	Number of Servers	Percent
Other	102	100.00%
VisNetic (85 servers)
Version	Number of Servers	Percent
9.3.2.0	25	29.41%
9.1.4.1	8	9.41%
8.0.3.1	6	7.06%
6.2.2.0	4	4.71%
5.0.2.3	4	4.71%
5.5.8.3	4	4.71%
8.5.0.8	4	4.71%
9.1.4.0	3	3.53%
7.2.4.1	3	3.53%
5.8.6.6	3	3.53%
5.0.2.0	2	2.35%
8.0.3	2	2.35%
7.6.1.0	2	2.35%
8.0.3.0	2	2.35%
5.8.6.4	2	2.35%
5.3.5.0	2	2.35%
8.3.5.0	1	1.18%
8.3.0.1	1	1.18%
8.3.0.0	1	1.18%
8.5.0.5	1	1.18%
5.4.5.4	1	1.18%
9.1.4.1 da-lax-msg mail.davidco.com	1	1.18%
6.0.9.0	1	1.18%
7.5.3.0	1	1.18%
9.1.4.1 provided by Techfount Systems Pte Ltd	1	1.18%
Other	0	0.00%
OpenSMTPD (67 servers)
Version	Number of Servers	Percent
Other	67	100.00%
Mercury (39 servers)
Version	Number of Servers	Percent
1.48	21	53.85%
3.32	12	30.77%
1.47	2	5.13%
3.21c	2	5.13%
3.21	1	2.56%
4.x	1	2.56%
Other	0	0.00%
Interscan (30 servers)
Version	Number of Servers	Percent
3.81-Build_1022	6	20.00%
3.55 (build 1016)	6	20.00%
3.55 (build 1029)	5	16.67%
3.81-Build_1084	3	10.00%
3.8-Build_3013	2	6.67%
3.53 (build 2011)	2	6.67%
3.5 (build 1294)	1	3.33%
3.51 (build 1337)	1	3.33%
3.53 (build 2013)	1	3.33%
3.53 (build 2017)	1	3.33%
3.53 (build 1493)	1	3.33%
3.8-Build_3045	1	3.33%
Other	0	0.00%
OpenVMS (23 servers)
Version	Number of Servers	Percent
8.3	10	43.48%
8.4	7	30.43%
7.3	5	21.74%
8.2	1	4.35%
Other	0	0.00%
NetIQ MailMarshal (22 servers)
Version	Number of Servers	Percent
6.0.3.8	14	63.64%
5.5.6.5	2	9.09%
5.5.6.6	2	9.09%
5.5.5.6	1	4.55%
5.5.4.17	1	4.55%
5.5.6.7	1	4.55%
6.1.3.15	1	4.55%
Other	0	0.00%
WebSTAR V (22 servers)
Version	Number of Servers	Percent
5.4.1	12	54.55%
5.4.0	5	22.73%
5.3.4	3	13.64%
5.3.3	1	4.55%
5.3.2	1	4.55%
Other	0	0.00%
Neon Mail Server (16 servers)
Version	Number of Servers	Percent
3.0.7	5	31.25%
3.1.4	2	12.50%
3.1.2	2	12.50%
3.0.9	2	12.50%
3.1.0	2	12.50%
3.1.3	1	6.25%
3.1.5	1	6.25%
3.0.6	1	6.25%
Other	0	0.00%
MessageWall (11 servers)
Version	Number of Servers	Percent
1.0.8	10	90.91%
1.0.6	1	9.09%
Other	0	0.00%
WebSTAR (11 servers)
Version	Number of Servers	Percent
Other	11	100.00%
ModusMail (10 servers)
Version	Number of Servers	Percent
4.35.477.0	6	60.00%
4.1.361.21	1	10.00%
3.2.315.0	1	10.00%
4.35.477.8	1	10.00%
3.1.302.0	1	10.00%
Other	0	0.00%
MAILsweeper (4 servers)
Version	Number of Servers	Percent
4.3.17.0	2	50.00%
4.3.19.0	1	25.00%
4.3.20.0	1	25.00%
Other	0	0.00%