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	1,945,922	100.0%
Number of Servers that didn't respond	323,078	16.60%
Server didn't open socket	311,101	15.99%
Server didn't provide banner	11,977	0.62%
Server provided banner	1,622,844	83.40%
Server banner identifies software in use	933,952	48.00%

As indicated by the above table, of the 1,945,922 servers queried, only 933,952 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	235,847	25.25%
Sendmail	216,246	23.15%
Microsoft	203,153	21.75%
Postfix	163,249	17.48%
MailEnable	26,291	2.82%
MDaemon	23,300	2.49%
IMail	20,188	2.16%
Kerio	6,354	0.68%
Lotus Domino	6,331	0.68%
WinWebMail	5,146	0.55%
Merak	4,807	0.51%
CommuniGate Pro	4,678	0.50%
XMail	2,701	0.29%
GroupWise	2,509	0.27%
Trend Micro	2,256	0.24%
ArGoSoft	2,231	0.24%
Qmail Toaster	1,781	0.19%
SurgeSMTP	1,661	0.18%
Gordano Messaging Suite (GMS)	876	0.09%
Post.Office	783	0.08%
Mirapoint	550	0.06%
InterScan VirusWall	527	0.06%
VisNetic	487	0.05%
NetIQ MailMarshal	436	0.05%
MagicMail	436	0.05%
Interscan	342	0.04%
Neon Mail Server	163	0.02%
WebSTAR V	162	0.02%
Mercury	154	0.02%
ModusMail	94	0.01%
MessageWall	71	0.01%
WebSTAR	63	0.01%
MAILsweeper	53	0.01%
OpenVMS	26	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (235,847 servers)
Version	Number of Servers	Percent
4.69	163,716	69.42%
4.63	23,333	9.89%
4.68	15,742	6.67%
4.67	9,366	3.97%
4.66	4,765	2.02%
4.60	4,610	1.95%
4.50	4,078	1.73%
4.62	3,480	1.48%
Other	6,757	2.86%
Sendmail (216,246 servers)
Version	Number of Servers	Percent
8.13.1	36,073	16.68%
8.12.11.20060614	23,807	11.01%
8.13.6	20,946	9.69%
8.13.8	19,800	9.16%
8.12.11.20060308	19,327	8.94%
8.11.6	13,950	6.45%
8.13.6.20060614	11,203	5.18%
8.12.10	10,970	5.07%
8.12.11	10,254	4.74%
8.14.1	8,806	4.07%
8.14.2	6,720	3.11%
8.13.4	5,691	2.63%
8.14.3	5,382	2.49%
8.13.7	4,871	2.25%
8.12.8	4,565	2.11%
8.9.3	2,655	1.23%
8.10.2	2,304	1.07%
Other	8,922	4.13%
Microsoft (203,153 servers)
Version	Number of Servers	Percent
6.0.3790.3959	153,130	75.38%
6.0.3790.1830	29,574	14.56%
5.0.2195.6713	13,392	6.59%
6.0.3790.211	3,720	1.83%
Other	3,337	1.64%
Postfix (163,249 servers)
Version	Number of Servers	Percent
Other	163,249	100.00%
MailEnable (26,291 servers)
Version	Number of Servers	Percent
1.981--	5,505	20.94%
1.986--	3,513	13.36%
1.983--	3,341	12.71%
1.96--	1,317	5.01%
1.95--	1,198	4.56%
1.9--	970	3.69%
1.8--	731	2.78%
0-3.14-	682	2.59%
0-2.37-	654	2.49%
0-3.53-	574	2.18%
0-1.85-	523	1.99%
0--3.53	415	1.58%
0-2.52-	376	1.43%
0-1.87-	322	1.22%
0-2.38-	318	1.21%
0-3.6-	317	1.21%
0--3.14	276	1.05%
--3.6	268	1.02%
0-2.36-	265	1.01%
Other	4,726	17.98%
MDaemon (23,300 servers)
Version	Number of Servers	Percent
10.0.1	3,798	16.30%
9.6.6	2,057	8.83%
9.6.5	1,595	6.85%
10.0.0	1,589	6.82%
9.6.1	1,432	6.15%
9.6.4	1,013	4.35%
9.6.2	865	3.71%
8.1.3	814	3.49%
9.5.2	810	3.48%
9.5.6	795	3.41%
9.0.4	728	3.12%
9.5.1	645	2.77%
9.6.3	543	2.33%
7.2.3	471	2.02%
6.8.5	446	1.91%
9.0.1	376	1.61%
7.2.0	370	1.59%
9.5.5	326	1.40%
9.0.0	305	1.31%
8.0.2	282	1.21%
8.1.4	273	1.17%
8.1.1	236	1.01%
Other	3,531	15.15%
IMail (20,188 servers)
Version	Number of Servers	Percent
8.22	4,228	20.94%
8.15	2,493	12.35%
10.01	1,784	8.84%
9.23	1,752	8.68%
8.05	1,200	5.94%
9.10	1,176	5.83%
7.07	782	3.87%
9.21	682	3.38%
7.15	662	3.28%
10.0	661	3.27%
6.06	511	2.53%
8.00	424	2.10%
9.22	371	1.84%
8.10	368	1.82%
9.20	358	1.77%
8.04	351	1.74%
8.21	333	1.65%
8.01	250	1.24%
8.20	209	1.04%
Other	1,593	7.89%
Kerio (6,354 servers)
Version	Number of Servers	Percent
6.5.2	1,369	21.55%
6.6.0	1,241	19.53%
6.5.0	694	10.92%
6.5.1	538	8.47%
6.4.1	473	7.44%
6.3.1	430	6.77%
6.4.0	306	4.82%
6.4.2	305	4.80%
6.3.0	176	2.77%
6.1.3	70	1.10%
6.2.0	67	1.05%
6.2.2	65	1.02%
6.1.0	64	1.01%
Other	556	8.75%
Lotus Domino (6,331 servers)
Version	Number of Servers	Percent
7.0.2	666	10.52%
8.0.1	612	9.67%
8.0.2	425	6.71%
7.0.3	391	6.18%
6.5.4	347	5.48%
7.0.1	332	5.24%
6.5.1	289	4.56%
7.0.2FP2	277	4.38%
6.5.3	262	4.14%
7.0	235	3.71%
6.5.5	217	3.43%
8.0	206	3.25%
7.0.3FP1	197	3.11%
6.5	191	3.02%
7.0.2FP1	129	2.04%
5.0.11	121	1.91%
6.5.2	114	1.80%
7.0.2FP3	80	1.26%
5.0.12	76	1.20%
6.5.6	76	1.20%
5.0.13a	69	1.09%
Other	1,019	16.10%
WinWebMail (5,146 servers)
Version	Number of Servers	Percent
3.7.6.1	1,283	24.93%
3.7.3.1	1,193	23.18%
3.7.1.1	680	13.21%
3.7.5.1	372	7.23%
3.6.3.1	357	6.94%
3.7.7.3	322	6.26%
3.7.0.5	294	5.71%
3.7.7.1	227	4.41%
3.7.0.7	189	3.67%
3.7.0.3	179	3.48%
Other	50	0.97%
Merak (4,807 servers)
Version	Number of Servers	Percent
8.0.3	1,901	39.55%
8.9.1	472	9.82%
8.5.0	297	6.18%
7.4.5	250	5.20%
7.6.4	224	4.66%
7.5.2	221	4.60%
8.3.8	200	4.16%
7.4.2	100	2.08%
9.0.0	98	2.04%
7.6.1	78	1.62%
7.2.0	75	1.56%
6.2.1	72	1.50%
8.2.4	61	1.27%
8.2.13	55	1.14%
Other	703	14.62%
CommuniGate Pro (4,678 servers)
Version	Number of Servers	Percent
4.1.8	385	8.23%
5.1.13	252	5.39%
4.2.10	245	5.24%
5.2.8	226	4.83%
5.2.10	184	3.93%
5.1.12	182	3.89%
5.1.16	175	3.74%
5.2.9	158	3.38%
5.1.14	141	3.01%
5.2.6	136	2.91%
5.2.3	135	2.89%
5.2.0	119	2.54%
5.2.5	115	2.46%
5.0.9	112	2.39%
5.0.13	106	2.27%
5.0.14	91	1.95%
5.1.10	85	1.82%
5.1.9	84	1.80%
5.1.7	83	1.77%
5.1.8	68	1.45%
4.2.8	62	1.33%
5.1.11	61	1.30%
5.2.1	61	1.30%
5.2.7	58	1.24%
4.2	58	1.24%
4.3.12	55	1.18%
4.2.9	55	1.18%
4.2.7	53	1.13%
5.0.8	50	1.07%
Other	1,083	23.15%
XMail (2,701 servers)
Version	Number of Servers	Percent
1.22	778	28.80%
1.25	620	22.95%
1.24	506	18.73%
1.21	244	9.03%
1.17	123	4.55%
1.20	112	4.15%
1.23	103	3.81%
1.12	76	2.81%
1.16	35	1.30%
Other	104	3.85%
GroupWise (2,509 servers)
Version	Number of Servers	Percent
7.0.3	797	31.77%
7.0.2	485	19.33%
6.5.7	279	11.12%
7.0.1	214	8.53%
6.5.4	163	6.50%
6.5.6	106	4.22%
6.0.4	101	4.03%
6.5.1	66	2.63%
7.0	65	2.59%
6.5.5	60	2.39%
6.5.2	26	1.04%
Other	147	5.86%
Trend Micro (2,256 servers)
Version	Number of Servers	Percent
5.7	1,064	47.16%
5.5	731	32.40%
5.18	324	14.36%
7.0	96	4.26%
Other	41	1.82%
ArGoSoft (2,231 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.5)	533	23.89%
1.8 (1.8.9.3)	348	15.60%
1.8 (1.8.9.1)	266	11.92%
1.8 (1.8.8.7)	174	7.80%
1.8 (1.8.8.8)	173	7.75%
1.8 (1.8.9.2)	116	5.20%
1.8 (1.8.9.4)	58	2.60%
1.8 (1.8.8.9)	58	2.60%
1.8 (1.8.8.1)	42	1.88%
1.8 (1.8.9.0)	42	1.88%
1.8 (1.8.6.0)	32	1.43%
1.8 (1.8.8.2)	30	1.34%
1.8 (1.8.5.9)	28	1.26%
Other	331	14.84%
Qmail Toaster (1,781 servers)
Version	Number of Servers	Percent
1.3	1,460	81.98%
1.2	250	14.04%
1.0	51	2.86%
Other	20	1.12%
SurgeSMTP (1,661 servers)
Version	Number of Servers	Percent
3.9e-1	512	30.82%
3.8k4-4	180	10.84%
3.9c-1	174	10.48%
3.9g2-2	165	9.93%
3.8f3-3	82	4.94%
3.7b8-8	68	4.09%
3.8i3-3	58	3.49%
3.5b3-3	51	3.07%
3.6f5-5	50	3.01%
3.8f2-2	37	2.23%
3.0c2-2	30	1.81%
3.8k2-2	18	1.08%
Other	236	14.21%
Gordano Messaging Suite (GMS) (876 servers)
Version	Number of Servers	Percent
Other	876	100.00%
Post.Office (783 servers)
Version	Number of Servers	Percent
3.5.3	187	23.88%
4.0.1	76	9.71%
3.5.3J	55	7.02%
4.1.0.2	51	6.51%
3.8.3	41	5.24%
3.6.3	31	3.96%
3.9.2.3	28	3.58%
3.1.2J	26	3.32%
3.9.1	25	3.19%
3.6.2	25	3.19%
3.8.7.4	21	2.68%
3.9.2	20	2.55%
3.9.0	20	2.55%
3.1.2	19	2.43%
3.8.4	16	2.04%
4.1	13	1.66%
3.5.2	12	1.53%
4.0.0.2	11	1.40%
3.9.1.3	10	1.28%
3.9.2.1	10	1.28%
4.0.0.1	9	1.15%
3.8.2	8	1.02%
3.6.0	8	1.02%
Other	61	7.79%
Mirapoint (550 servers)
Version	Number of Servers	Percent
3.8.4-GA	100	18.18%
3.8.3-GA	82	14.91%
3.8.6-GA	56	10.18%
3.8.7a	47	8.55%
3.8.5-GA	40	7.27%
3.7.5a-GA	38	6.91%
3.10.3-GA	29	5.27%
3.8.2-GA	26	4.73%
3.7.3a-GA	24	4.36%
3.10.2-GA	22	4.00%
3.7.4b-GA	20	3.64%
4.0.5a	12	2.18%
4.1.3-GA	9	1.64%
3.7.5-GA	6	1.09%
Other	39	7.09%
InterScan VirusWall (527 servers)
Version	Number of Servers	Percent
Other	527	100.00%
VisNetic (487 servers)
Version	Number of Servers	Percent
9.1.4.1	161	33.06%
8.5.0.8	29	5.95%
9.1.4.0	29	5.95%
5.8.6.6	25	5.13%
7.2.4.1	25	5.13%
5.0.2.3	21	4.31%
8.3.5.0	21	4.31%
6.2.2.0	18	3.70%
5.5.8.3	16	3.29%
8.0.3.0	15	3.08%
5.3.5.0	13	2.67%
8.0.3.1	13	2.67%
7.6.1.0	13	2.67%
8.0.3	12	2.46%
5.4.5.4	9	1.85%
8.3.6	8	1.64%
7.5.3.0	8	1.64%
5.8.6.4	6	1.23%
8.5.0.5	5	1.03%
7.2.4.0	5	1.03%
6.0.9.0	5	1.03%
Other	30	6.16%
NetIQ MailMarshal (436 servers)
Version	Number of Servers	Percent
6.0.3.8	340	77.98%
6.1.3.15	23	5.28%
5.5.6.7	23	5.28%
5.5.6.6	10	2.29%
5.5.4.16	8	1.83%
5.5.5.9	7	1.61%
5.5.6.5	7	1.61%
5.5.5.6	5	1.15%
5.5.4.17	5	1.15%
Other	8	1.83%
MagicMail (436 servers)
Version	Number of Servers	Percent
Other	436	100.00%
Interscan (342 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	62	18.13%
3.8-Build_3013	59	17.25%
3.81-Build_1022	45	13.16%
3.55 (build 1029)	35	10.23%
3.53 (build 2017)	27	7.89%
3.53 (build 2011)	18	5.26%
3.53 (build 1493)	15	4.39%
3.81-Build_1084	13	3.80%
3.55 (build 1020)	13	3.80%
3.53 (build 2013)	12	3.51%
3.52 (build 1375)	8	2.34%
3.8-Build_1080	5	1.46%
Other	30	8.77%
Neon Mail Server (163 servers)
Version	Number of Servers	Percent
3.1.3	55	33.74%
3.0.7	30	18.40%
3.0.9	28	17.18%
3.1.2	18	11.04%
3.1.0	13	7.98%
3.1.4	7	4.29%
3.0.8	4	2.45%
3.1.1	3	1.84%
3.0.6	3	1.84%
3.0.5	2	1.23%
Other	0	0.00%
WebSTAR V (162 servers)
Version	Number of Servers	Percent
5.4.1	48	29.63%
5.4.0	41	25.31%
5.3.4	39	24.07%
5.3.3	16	9.88%
5.3.2	14	8.64%
5.3.1	2	1.23%
Other	2	1.23%
Mercury (154 servers)
Version	Number of Servers	Percent
1.48	73	47.40%
3.32	47	30.52%
3.21c	11	7.14%
3.31	6	3.90%
1.47	5	3.25%
1.44	3	1.95%
3.21	3	1.95%
3.01a	2	1.30%
1.49	2	1.30%
Other	2	1.30%
ModusMail (94 servers)
Version	Number of Servers	Percent
4.35.480.0	20	21.28%
3.2.315.0	17	18.09%
4.35.477.0	12	12.77%
4.3.459.0	9	9.57%
4.35.480.11	8	8.51%
3.1.302.0	7	7.45%
4.2.420.0	4	4.26%
3.1.293.1	3	3.19%
4.1.361.21	3	3.19%
4.2.425.4	2	2.13%
4.1.361.0	2	2.13%
4.2.425.22	1	1.06%
4.35.480	1	1.06%
4.2.420.1	1	1.06%
4.0.340.3	1	1.06%
4.0.330.8	1	1.06%
1.4.232.0	1	1.06%
4.35.477.8	1	1.06%
Other	0	0.00%
MessageWall (71 servers)
Version	Number of Servers	Percent
1.0.8	51	71.83%
1.0.11	17	23.94%
1.1.0	2	2.82%
1.0.6	1	1.41%
Other	0	0.00%
WebSTAR (63 servers)
Version	Number of Servers	Percent
Other	63	100.00%
MAILsweeper (53 servers)
Version	Number of Servers	Percent
4.3.20.0	16	30.19%
4.3.14.0	8	15.09%
4.3.17.0	8	15.09%
4.2.10.0	5	9.43%
4.3.1.0	5	9.43%
4.3.19.0	4	7.55%
4.3.10.0	2	3.77%
4.3.6.0	2	3.77%
4.2.1.0	1	1.89%
4.2.5.0	1	1.89%
4.1.5.0	1	1.89%
Other	0	0.00%
OpenVMS (26 servers)
Version	Number of Servers	Percent
8.3	15	57.69%
7.3	6	23.08%
8.2	3	11.54%
7.2	2	7.69%
Other	0	0.00%