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	2,302,234	100.0%
Number of Servers that didn't respond	371,528	16.14%
Server didn't open socket	360,115	15.64%
Server didn't provide banner	11,413	0.50%
Server provided banner	1,930,706	83.86%
Server banner identifies software in use	1,054,843	45.82%

As indicated by the above table, of the 2,302,234 servers queried, only 1,054,843 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	478,518	45.36%
Postfix	246,251	23.34%
Sendmail	126,131	11.96%
Microsoft	117,055	11.10%
MailEnable	33,095	3.14%
MDaemon	20,922	1.98%
IMail	8,638	0.82%
Lotus Domino	4,653	0.44%
WinWebMail	3,783	0.36%
CommuniGate Pro	3,230	0.31%
XMail	2,249	0.21%
Kerio	1,981	0.19%
Qmail Toaster	1,667	0.16%
Merak	1,487	0.14%
SurgeSMTP	1,199	0.11%
ArGoSoft	906	0.09%
GroupWise	700	0.07%
Trend Micro	407	0.04%
Gordano Messaging Suite (GMS)	392	0.04%
Post.Office	379	0.04%
MagicMail	363	0.03%
Mirapoint	212	0.02%
VisNetic	157	0.01%
InterScan VirusWall	135	0.01%
Interscan	64	0.01%
NetIQ MailMarshal	54	0.01%
Mercury	53	0.01%
WebSTAR V	36	0.00%
Neon Mail Server	36	0.00%
OpenVMS	22	0.00%
MessageWall	20	0.00%
ModusMail	15	0.00%
OpenSMTPD	14	0.00%
WebSTAR	12	0.00%
MAILsweeper	7	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (478,518 servers)
Version	Number of Servers	Percent
4.69	363,768	76.02%
4.76	38,662	8.08%
4.77	26,422	5.52%
4.72	19,908	4.16%
4.67	7,670	1.60%
4.63	5,572	1.16%
Other	16,516	3.45%
Postfix (246,251 servers)
Version	Number of Servers	Percent
Other	246,251	100.00%
Sendmail (126,131 servers)
Version	Number of Servers	Percent
8.13.8	32,151	25.49%
8.13.1	20,703	16.41%
8.14.3	16,963	13.45%
8.14.5	10,982	8.71%
8.14.4	10,860	8.61%
8.12.11.20060308	5,331	4.23%
8.13.6.20060614	4,216	3.34%
8.14.2	3,829	3.04%
8.11.6	2,802	2.22%
8.12.10	2,558	2.03%
8.14.1	2,183	1.73%
8.13.6	2,168	1.72%
8.12.11.20060614	1,965	1.56%
8.13.7	1,725	1.37%
8.12.11	1,549	1.23%
8.12.8	1,298	1.03%
Other	4,848	3.84%
Microsoft (117,055 servers)
Version	Number of Servers	Percent
6.0.3790.4675	92,379	78.92%
6.0.3790.3959	15,075	12.88%
6.0.3790.1830	4,156	3.55%
5.0.2195.7381	1,363	1.16%
Other	4,082	3.49%
MailEnable (33,095 servers)
Version	Number of Servers	Percent
1.986--	8,736	26.40%
4.26--	2,590	7.83%
5.10--	2,273	6.87%
1.981--	1,697	5.13%
1.983--	1,061	3.21%
0-3.63-	793	2.40%
5.51--	765	2.31%
3.62--	743	2.25%
5.11--	647	1.95%
6.03--	616	1.86%
6.0--	530	1.60%
4.22--	447	1.35%
0-1.87-	399	1.21%
4.23--	394	1.19%
0-4.26-	389	1.18%
0-5.51-	379	1.15%
0-6.03-	378	1.14%
0-2.53-	342	1.03%
Other	9,916	29.96%
MDaemon (20,922 servers)
Version	Number of Servers	Percent
12.5.3	3,233	15.45%
11.0.3	2,627	12.56%
11.0.0	1,290	6.17%
10.0.0	920	4.40%
10.1.2	896	4.28%
12.5.2	854	4.08%
12.0.3	812	3.88%
10.1.1	719	3.44%
12.0.4	575	2.75%
9.6.1	547	2.61%
9.6.6	504	2.41%
10.1.0	469	2.24%
9.5.2	342	1.63%
12.5.0	339	1.62%
10.0.5	334	1.60%
9.6.5	331	1.58%
12.5.1	328	1.57%
9.6.2	318	1.52%
12.0.1	295	1.41%
9.5.1	295	1.41%
10.0.2	283	1.35%
12.0.0	276	1.32%
9.5.6	270	1.29%
9.6.4	246	1.18%
8.1.3	243	1.16%
9.0.4	227	1.08%
10.0.4	224	1.07%
12.5.4	214	1.02%
Other	2,911	13.91%
IMail (8,638 servers)
Version	Number of Servers	Percent
8.22	1,576	18.24%
11.5	1,377	15.94%
8.15	577	6.68%
9.23	528	6.11%
11.03	477	5.52%
11.01	416	4.82%
8.05	347	4.02%
11.02	285	3.30%
12.0.0.348	284	3.29%
10.02	279	3.23%
11.0	258	2.99%
7.07	217	2.51%
9.10	198	2.29%
7.15	195	2.26%
9.20	193	2.23%
8.00	171	1.98%
6.06	160	1.85%
10.01	134	1.55%
9.21	108	1.25%
Other	858	9.93%
Lotus Domino (4,653 servers)
Version	Number of Servers	Percent
8.5.3	709	15.24%
8.5.2	432	9.28%
8.5.2FP2	332	7.14%
8.5.1	285	6.13%
7.0.2	234	5.03%
8.5.2FP3	207	4.45%
8.5	192	4.13%
8.5.2FP1	155	3.33%
7.0.3	132	2.84%
8.5.1FP5	108	2.32%
8.0.1	105	2.26%
8.0.2	103	2.21%
7.0.1	101	2.17%
6.5.4	93	2.00%
6.5.1	89	1.91%
7.0	78	1.68%
6.5.3	77	1.65%
8.0	73	1.57%
8.5.1FP3	62	1.33%
8.5.2FP4	60	1.29%
7.0.3FP1	60	1.29%
6.5.5	58	1.25%
6.5	57	1.23%
8.5.1FP4	56	1.20%
7.0.2FP2	50	1.07%
Other	745	16.01%
WinWebMail (3,783 servers)
Version	Number of Servers	Percent
3.8.1.3	815	21.54%
3.8.0.1	593	15.68%
3.7.6.1	470	12.42%
3.8.1.5	335	8.86%
3.7.3.1	320	8.46%
3.8.1.1	312	8.25%
3.7.7.3	309	8.17%
3.7.1.1	158	4.18%
3.7.5.1	112	2.96%
3.7.7.1	87	2.30%
3.6.3.1	77	2.04%
3.7.0.5	62	1.64%
3.7.0.3	59	1.56%
3.7.0.7	53	1.40%
Other	21	0.56%
CommuniGate Pro (3,230 servers)
Version	Number of Servers	Percent
5.1.16	255	7.89%
5.4.4	175	5.42%
4.1.8	161	4.98%
5.4.1	125	3.87%
5.4.3	119	3.68%
5.2.20	118	3.65%
5.4.2	111	3.44%
5.3.13	108	3.34%
5.2.16	88	2.72%
4.2.10	79	2.45%
5.1.12	72	2.23%
5.0.14	66	2.04%
5.2.19	65	2.01%
5.2.3	63	1.95%
5.4.0	59	1.83%
5.3.8	59	1.83%
5.3.15	57	1.76%
5.2.14	56	1.73%
5.3.12	54	1.67%
5.3.10	52	1.61%
5.4	49	1.52%
5.1.13	48	1.49%
5.2.12	47	1.46%
5.3.9	44	1.36%
5.2.8	39	1.21%
5.2.13	35	1.08%
Other	1,026	31.76%
XMail (2,249 servers)
Version	Number of Servers	Percent
1.22	510	22.68%
1.27	489	21.74%
1.25	426	18.94%
1.26	273	12.14%
1.24	216	9.60%
1.21	91	4.05%
1.23	55	2.45%
1.20	42	1.87%
1.17	34	1.51%
1.12	33	1.47%
Other	80	3.56%
Kerio (1,981 servers)
Version	Number of Servers	Percent
6.7.3	299	15.09%
6.6.2	195	9.84%
6.7.0	167	8.43%
6.5.2	144	7.27%
6.5.0	134	6.76%
6.7.2	118	5.96%
6.4.1	111	5.60%
6.3.1	100	5.05%
6.7.1	98	4.95%
6.4.0	76	3.84%
6.6.0	75	3.79%
6.5.1	71	3.58%
6.6.1	62	3.13%
6.4.2	48	2.42%
6.3.0	34	1.72%
6.2.0	25	1.26%
6.2.2	21	1.06%
6.0.10	21	1.06%
6.1.0	21	1.06%
6.1.3	21	1.06%
Other	140	7.07%
Qmail Toaster (1,667 servers)
Version	Number of Servers	Percent
1.3	1,575	94.48%
1.2	56	3.36%
1.0	19	1.14%
Other	17	1.02%
Merak (1,487 servers)
Version	Number of Servers	Percent
8.0.3	614	41.29%
8.9.1	154	10.36%
8.5.0	108	7.26%
7.5.2	68	4.57%
7.6.4	68	4.57%
8.3.8	62	4.17%
7.4.5	56	3.77%
9.0.0	27	1.82%
7.4.2	23	1.55%
8.2.4	21	1.41%
7.2.0	20	1.34%
7.6.1	20	1.34%
6.2.1	19	1.28%
8.9.0	19	1.28%
8.3.15	19	1.28%
7.0.1	17	1.14%
4.4.2	16	1.08%
Other	156	10.49%
SurgeSMTP (1,199 servers)
Version	Number of Servers	Percent
5.3h2-2	337	28.11%
5.2a-1	145	12.09%
6.0a3-3	87	7.26%
3.9e-1	84	7.01%
4.0u4-4	37	3.09%
3.8k4-4	36	3.00%
6.0a2-2	34	2.84%
5.3h-1	29	2.42%
4.2d2-2	22	1.83%
5.0e4-4	21	1.75%
3.8i3-3	21	1.75%
4.3g2-2	20	1.67%
4.2d4-4	16	1.33%
3.6f5-5	15	1.25%
3.9h-18	14	1.17%
3.9c-1	13	1.08%
4.2a3-3	13	1.08%
5.0e3-3	13	1.08%
4.3e-1	12	1.00%
3.7b8-8	12	1.00%
5.1c2-2	12	1.00%
Other	206	17.18%
ArGoSoft (906 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	212	23.40%
1.8 (1.8.9.5)	143	15.78%
1.8 (1.8.9.3)	113	12.47%
1.8 (1.8.9.1)	80	8.83%
1.8 (1.8.8.8)	68	7.51%
1.8 (1.8.8.7)	49	5.41%
1.8 (1.8.9.2)	37	4.08%
1.8 (1.8.9.4)	22	2.43%
1.8 (1.8.6.0)	21	2.32%
1.8 (1.8.8.1)	15	1.66%
1.8 (1.8.8.9)	13	1.43%
1.8 (1.8.9.0)	11	1.21%
1.8 (1.8.8.2)	11	1.21%
Other	111	12.25%
GroupWise (700 servers)
Version	Number of Servers	Percent
8.0.2	156	22.29%
7.0.3	146	20.86%
6.5.7	72	10.29%
7.0.2	49	7.00%
7.0.4	47	6.71%
8.0.1	41	5.86%
6.5.4	29	4.14%
7.0.1	26	3.71%
6.5.6	22	3.14%
8.0.0	20	2.86%
6.0.4	18	2.57%
6.5.1	16	2.29%
6.5.5	14	2.00%
7.0	8	1.14%
Other	36	5.14%
Trend Micro (407 servers)
Version	Number of Servers	Percent
5.7	164	40.29%
5.5	101	24.82%
5.18	70	17.20%
7.0	44	10.81%
7.1	17	4.18%
Other	11	2.70%
Gordano Messaging Suite (GMS) (392 servers)
Version	Number of Servers	Percent
Other	392	100.00%
Post.Office (379 servers)
Version	Number of Servers	Percent
3.5.3	58	15.30%
4.1.0.2	38	10.03%
4.0.1	33	8.71%
4.1.2.4	20	5.28%
3.5.3J	18	4.75%
3.9.2.3	15	3.96%
4.1.1	15	3.96%
3.8.3	12	3.17%
3.1.2	10	2.64%
3.9.2	10	2.64%
3.1.2J	10	2.64%
4.2	10	2.64%
4.0.1.1	9	2.37%
4.1.0.3	9	2.37%
4.1.0.4	8	2.11%
3.8.7.4	8	2.11%
4.1.2.3	7	1.85%
3.6.2	7	1.85%
3.9.2.1	6	1.58%
4.2.1	6	1.58%
4.1	5	1.32%
4.1.2.2	5	1.32%
4.0.0.2	5	1.32%
3.9.1	5	1.32%
3.5.1	5	1.32%
3.9.2.2	4	1.06%
3.9.1.3	4	1.06%
4.0.0.1	4	1.06%
3.5.2	4	1.06%
Other	29	7.65%
MagicMail (363 servers)
Version	Number of Servers	Percent
Other	363	100.00%
Mirapoint (212 servers)
Version	Number of Servers	Percent
4.2.3-GA	22	10.38%
3.10.10a-GA	21	9.91%
3.8.4-GA	18	8.49%
3.10.5-GA	15	7.08%
4.1.10-GA	14	6.60%
3.10.9-GA	12	5.66%
3.8.3-GA	11	5.19%
3.10.8-GA	9	4.25%
4.1.9-GA	9	4.25%
4.1.3-GA	8	3.77%
4.1.8-GA	7	3.30%
4.1.4-GA	6	2.83%
4.3.3-GA	6	2.83%
3.10.7-GA	6	2.83%
3.8.5-GA	5	2.36%
3.8.6-GA	4	1.89%
3.8.7a	4	1.89%
4.2.4-GA	4	1.89%
3.10.3-GA	4	1.89%
3.7.5a-GA	3	1.42%
4.1.5-GA	3	1.42%
Other	21	9.91%
VisNetic (157 servers)
Version	Number of Servers	Percent
9.3.2.0	46	29.30%
9.1.4.1	22	14.01%
8.5.0.8	9	5.73%
5.8.6.6	9	5.73%
5.5.8.3	8	5.10%
8.0.3.1	6	3.82%
5.0.2.3	6	3.82%
7.6.1.0	6	3.82%
8.0.3.0	5	3.18%
8.0.3	5	3.18%
7.2.4.1	4	2.55%
5.3.5.0	4	2.55%
8.3.5.0	3	1.91%
6.2.2.0	3	1.91%
9.1.4.0	2	1.27%
8.3.0.1	2	1.27%
5.4.5.4	2	1.27%
7-6-1-0	2	1.27%
Other	13	8.28%
InterScan VirusWall (135 servers)
Version	Number of Servers	Percent
Other	135	100.00%
Interscan (64 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	11	17.19%
3.81-Build_1022	10	15.62%
3.55 (build 1029)	8	12.50%
3.8-Build_3013	6	9.38%
3.53 (build 2017)	5	7.81%
3.81-Build_1084	4	6.25%
3.53 (build 1493)	3	4.69%
3.53 (build 2011)	3	4.69%
3.55 (build 1020)	3	4.69%
3.81-Build_1055	2	3.12%
3.53 (build 2013)	2	3.12%
3.52 (build 1375)	2	3.12%
3.5 (build 1294)	1	1.56%
3.51 (build 1337)	1	1.56%
3.6-Build_1246	1	1.56%
3.8-Build_3045	1	1.56%
3.8-Build_1080	1	1.56%
Other	0	0.00%
NetIQ MailMarshal (54 servers)
Version	Number of Servers	Percent
6.0.3.8	39	72.22%
5.5.6.7	5	9.26%
6.1.3.15	3	5.56%
5.5.6.5	2	3.70%
5.5.5.9	1	1.85%
5.5.4.17	1	1.85%
5.5.6.6	1	1.85%
5.5.4.16	1	1.85%
5.5.5.6	1	1.85%
Other	0	0.00%
Mercury (53 servers)
Version	Number of Servers	Percent
1.48	27	50.94%
3.32	14	26.42%
3.01a	2	3.77%
1.47	2	3.77%
3.21c	2	3.77%
3.30	2	3.77%
3.21	1	1.89%
1.44	1	1.89%
3.31	1	1.89%
4.x	1	1.89%
Other	0	0.00%
WebSTAR V (36 servers)
Version	Number of Servers	Percent
5.4.1	16	44.44%
5.4.0	9	25.00%
5.3.4	6	16.67%
5.3.3	4	11.11%
5.3.2	1	2.78%
Other	0	0.00%
Neon Mail Server (36 servers)
Version	Number of Servers	Percent
3.1.3	9	25.00%
3.0.7	9	25.00%
3.1.4	4	11.11%
3.0.9	4	11.11%
3.1.0	4	11.11%
3.1.2	2	5.56%
3.1.1	1	2.78%
3.0.8	1	2.78%
3.1.5	1	2.78%
3.0.6	1	2.78%
Other	0	0.00%
OpenVMS (22 servers)
Version	Number of Servers	Percent
8.3	9	40.91%
7.3	6	27.27%
8.4	4	18.18%
6.1	1	4.55%
7.2	1	4.55%
8.2	1	4.55%
Other	0	0.00%
MessageWall (20 servers)
Version	Number of Servers	Percent
1.0.8	19	95.00%
1.0.6	1	5.00%
Other	0	0.00%
ModusMail (15 servers)
Version	Number of Servers	Percent
4.35.477.0	6	40.00%
4.35.480.0	3	20.00%
4.1.361.21	1	6.67%
3.2.315.0	1	6.67%
4.0.340.3	1	6.67%
4.3.459.0	1	6.67%
4.35.477.8	1	6.67%
3.1.302.0	1	6.67%
Other	0	0.00%
OpenSMTPD (14 servers)
Version	Number of Servers	Percent
Other	14	100.00%
WebSTAR (12 servers)
Version	Number of Servers	Percent
Other	12	100.00%
MAILsweeper (7 servers)
Version	Number of Servers	Percent
4.3.17.0	2	28.57%
4.3.20.0	2	28.57%
4.3.19.0	2	28.57%
4.3.1.0	1	14.29%
Other	0	0.00%