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	2,397,082	100.0%
Number of Servers that didn't respond	399,835	16.68%
Server didn't open socket	387,802	16.18%
Server didn't provide banner	12,033	0.50%
Server provided banner	1,997,247	83.32%
Server banner identifies software in use	1,090,436	45.49%

As indicated by the above table, of the 2,397,082 servers queried, only 1,090,436 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	500,940	45.94%
Postfix	264,770	24.28%
Sendmail	125,694	11.53%
Microsoft	111,908	10.26%
MailEnable	33,810	3.10%
MDaemon	21,300	1.95%
IMail	8,188	0.75%
Lotus Domino	4,775	0.44%
WinWebMail	3,672	0.34%
CommuniGate Pro	3,299	0.30%
XMail	2,281	0.21%
Kerio	1,859	0.17%
Qmail Toaster	1,643	0.15%
Merak	1,429	0.13%
SurgeSMTP	1,092	0.10%
ArGoSoft	857	0.08%
GroupWise	626	0.06%
Trend Micro	404	0.04%
Post.Office	392	0.04%
Gordano Messaging Suite (GMS)	376	0.03%
MagicMail	327	0.03%
Mirapoint	187	0.02%
VisNetic	152	0.01%
InterScan VirusWall	143	0.01%
Mercury	59	0.01%
Interscan	54	0.00%
NetIQ MailMarshal	44	0.00%
WebSTAR V	34	0.00%
Neon Mail Server	30	0.00%
MessageWall	20	0.00%
OpenVMS	20	0.00%
OpenSMTPD	18	0.00%
ModusMail	13	0.00%
WebSTAR	12	0.00%
MAILsweeper	8	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Exim (500,940 servers)
Version	Number of Servers	Percent
4.77	343,069	68.49%
4.69	64,594	12.89%
4.76	42,538	8.49%
4.72	21,937	4.38%
4.67	6,973	1.39%
4.63	5,372	1.07%
Other	16,457	3.29%
Postfix (264,770 servers)
Version	Number of Servers	Percent
Other	264,770	100.00%
Sendmail (125,694 servers)
Version	Number of Servers	Percent
8.13.8	33,322	26.51%
8.13.1	19,743	15.71%
8.14.3	16,729	13.31%
8.14.5	12,149	9.67%
8.14.4	11,161	8.88%
8.12.11.20060308	5,077	4.04%
8.13.6.20060614	4,011	3.19%
8.14.2	3,730	2.97%
8.11.6	2,644	2.10%
8.12.10	2,372	1.89%
8.14.1	2,108	1.68%
8.13.6	1,964	1.56%
8.12.11.20060614	1,679	1.34%
8.13.7	1,676	1.33%
8.12.11	1,431	1.14%
Other	5,898	4.69%
Microsoft (111,908 servers)
Version	Number of Servers	Percent
6.0.3790.4675	89,322	79.82%
6.0.3790.3959	13,439	12.01%
6.0.3790.1830	3,669	3.28%
7.5.7601.17514	1,311	1.17%
5.0.2195.7381	1,273	1.14%
Other	2,894	2.59%
MailEnable (33,810 servers)
Version	Number of Servers	Percent
1.986--	8,215	24.30%
5.10--	2,589	7.66%
4.26--	2,496	7.38%
1.981--	1,547	4.58%
6.0--	1,042	3.08%
1.983--	965	2.85%
6.03--	820	2.43%
0-3.63-	782	2.31%
5.51--	700	2.07%
3.62--	686	2.03%
5.11--	628	1.86%
6.53--	420	1.24%
4.22--	397	1.17%
0-4.26-	387	1.14%
0-1.87-	385	1.14%
0-6.03-	365	1.08%
4.23--	357	1.06%
Other	11,029	32.62%
MDaemon (21,300 servers)
Version	Number of Servers	Percent
12.5.6	2,626	12.33%
11.0.3	2,548	11.96%
12.5.4	1,537	7.22%
11.0.0	1,334	6.26%
10.0.0	880	4.13%
10.1.2	826	3.88%
12.5.3	820	3.85%
10.1.1	705	3.31%
12.0.3	612	2.87%
9.6.1	542	2.54%
12.5.2	497	2.33%
9.6.6	486	2.28%
10.1.0	467	2.19%
12.0.4	434	2.04%
12.5.5	350	1.64%
9.5.2	334	1.57%
9.6.2	324	1.52%
9.6.5	320	1.50%
10.0.5	311	1.46%
10.0.2	269	1.26%
9.5.1	269	1.26%
9.5.6	264	1.24%
12.0.1	247	1.16%
9.6.4	247	1.16%
8.1.3	233	1.09%
12.0.0	232	1.09%
12.5.1	224	1.05%
Other	3,362	15.78%
IMail (8,188 servers)
Version	Number of Servers	Percent
8.22	1,546	18.88%
11.5	1,340	16.37%
11.03	514	6.28%
9.23	506	6.18%
8.15	505	6.17%
11.01	419	5.12%
8.05	328	4.01%
12.0.0.384	286	3.49%
10.02	263	3.21%
12.0.0.348	241	2.94%
11.0	222	2.71%
7.07	209	2.55%
11.02	183	2.23%
6.06	150	1.83%
8.00	143	1.75%
7.15	141	1.72%
10.01	140	1.71%
9.21	100	1.22%
9.10	89	1.09%
Other	863	10.54%
Lotus Domino (4,775 servers)
Version	Number of Servers	Percent
8.5.3	804	16.84%
8.5.2	401	8.40%
8.5.2FP2	305	6.39%
8.5.1	263	5.51%
8.5.3FP1	241	5.05%
7.0.2	209	4.38%
8.5	182	3.81%
8.5.2FP3	172	3.60%
8.5.2FP1	125	2.62%
7.0.3	124	2.60%
8.5.1FP5	103	2.16%
7.0.1	102	2.14%
8.0.1	98	2.05%
8.0.2	95	1.99%
8.5.2FP4	93	1.95%
6.5.1	88	1.84%
6.5.4	87	1.82%
7.0	76	1.59%
6.5.3	76	1.59%
8.0	68	1.42%
8.5.1FP4	58	1.21%
7.0.3FP1	57	1.19%
8.5.1FP3	56	1.17%
6.5	53	1.11%
6.5.5	52	1.09%
Other	787	16.48%
WinWebMail (3,672 servers)
Version	Number of Servers	Percent
3.8.1.3	760	20.70%
3.8.0.1	544	14.81%
3.7.6.1	421	11.47%
3.8.1.5	381	10.38%
3.7.3.1	300	8.17%
3.7.7.3	279	7.60%
3.8.1.1	271	7.38%
3.8.2.1	156	4.25%
3.7.1.1	153	4.17%
3.7.5.1	99	2.70%
3.6.3.1	72	1.96%
3.7.7.1	64	1.74%
3.7.0.3	55	1.50%
3.7.0.5	51	1.39%
3.7.0.7	47	1.28%
Other	19	0.52%
CommuniGate Pro (3,299 servers)
Version	Number of Servers	Percent
5.1.16	259	7.85%
5.4.4	206	6.24%
5.4.5	205	6.21%
4.1.8	154	4.67%
5.2.20	119	3.61%
5.4.1	107	3.24%
5.3.13	100	3.03%
5.4.2	88	2.67%
4.2.10	83	2.52%
5.2.16	83	2.52%
5.4.3	82	2.49%
5.1.12	70	2.12%
5.0.14	67	2.03%
5.2.3	64	1.94%
5.2.19	62	1.88%
5.3.15	59	1.79%
5.4.0	54	1.64%
5.2.14	53	1.61%
5.3.8	50	1.52%
5.2.12	49	1.49%
5.3.12	47	1.42%
5.3.9	44	1.33%
5.3.10	43	1.30%
5.1.13	41	1.24%
5.4	39	1.18%
5.2.13	37	1.12%
5.2.8	35	1.06%
Other	999	30.28%
XMail (2,281 servers)
Version	Number of Servers	Percent
1.27	535	23.45%
1.22	526	23.06%
1.25	435	19.07%
1.26	267	11.71%
1.24	201	8.81%
1.21	86	3.77%
1.23	53	2.32%
1.20	42	1.84%
1.17	33	1.45%
1.12	23	1.01%
Other	80	3.51%
Kerio (1,859 servers)
Version	Number of Servers	Percent
6.7.3	287	15.44%
6.6.2	185	9.95%
6.7.0	166	8.93%
6.5.0	134	7.21%
6.5.2	130	6.99%
6.4.1	107	5.76%
6.7.2	107	5.76%
6.7.1	97	5.22%
6.3.1	84	4.52%
6.4.0	73	3.93%
6.6.0	71	3.82%
6.5.1	65	3.50%
6.6.1	62	3.34%
6.4.2	41	2.21%
6.3.0	36	1.94%
6.2.0	23	1.24%
6.0.10	20	1.08%
Other	171	9.20%
Qmail Toaster (1,643 servers)
Version	Number of Servers	Percent
1.3	1,558	94.83%
1.2	54	3.29%
Other	31	1.89%
Merak (1,429 servers)
Version	Number of Servers	Percent
8.0.3	582	40.73%
8.9.1	151	10.57%
8.5.0	103	7.21%
7.5.2	63	4.41%
7.6.4	62	4.34%
8.3.8	59	4.13%
7.4.5	55	3.85%
9.0.0	27	1.89%
7.4.2	23	1.61%
8.2.4	20	1.40%
7.0.1	19	1.33%
7.2.0	19	1.33%
8.9.0	19	1.33%
6.2.1	18	1.26%
7.6.1	18	1.26%
8.3.15	18	1.26%
4.4.2	16	1.12%
Other	157	10.99%
SurgeSMTP (1,092 servers)
Version	Number of Servers	Percent
5.3h2-2	203	18.59%
5.2a-1	127	11.63%
6.0a5-5	115	10.53%
3.9e-1	77	7.05%
6.0a4-4	74	6.78%
3.8k4-4	35	3.21%
4.0u4-4	31	2.84%
5.0e4-4	24	2.20%
5.3h-1	21	1.92%
4.2d2-2	20	1.83%
3.8i3-3	19	1.74%
4.3g2-2	19	1.74%
3.9h-18	15	1.37%
5.0e3-3	15	1.37%
3.7b8-8	14	1.28%
4.2d4-4	14	1.28%
3.6f5-5	14	1.28%
6.0a3-3	13	1.19%
5.1c2-2	12	1.10%
3.9c-1	12	1.10%
4.2a3-3	12	1.10%
4.3g4-4	12	1.10%
Other	194	17.77%
ArGoSoft (857 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.6)	210	24.50%
1.8 (1.8.9.5)	126	14.70%
1.8 (1.8.9.3)	109	12.72%
1.8 (1.8.9.1)	79	9.22%
1.8 (1.8.8.8)	57	6.65%
1.8 (1.8.8.7)	50	5.83%
1.8 (1.8.9.2)	32	3.73%
1.8 (1.8.9.4)	24	2.80%
1.8 (1.8.6.0)	19	2.22%
1.8 (1.8.8.1)	14	1.63%
1.8 (1.8.8.9)	13	1.52%
1.8 (1.8.9.0)	10	1.17%
Other	114	13.30%
GroupWise (626 servers)
Version	Number of Servers	Percent
8.0.2	150	23.96%
7.0.3	123	19.65%
6.5.7	71	11.34%
7.0.4	47	7.51%
7.0.2	39	6.23%
8.0.1	30	4.79%
6.5.4	25	3.99%
7.0.1	23	3.67%
6.5.6	21	3.35%
6.5.1	17	2.72%
6.0.4	14	2.24%
8.0.0	12	1.92%
6.5.5	11	1.76%
12.0.0	11	1.76%
7.0	7	1.12%
Other	25	3.99%
Trend Micro (404 servers)
Version	Number of Servers	Percent
5.7	162	40.10%
5.5	103	25.50%
5.18	71	17.57%
7.0	38	9.41%
7.1	19	4.70%
Other	11	2.72%
Post.Office (392 servers)
Version	Number of Servers	Percent
3.5.3	58	14.80%
4.1.0.2	40	10.20%
4.0.1	29	7.40%
4.1.2.4	23	5.87%
3.9.2.3	16	4.08%
4.1.1	16	4.08%
3.5.3J	15	3.83%
3.8.3	13	3.32%
4.2	12	3.06%
3.9.2	11	2.81%
3.1.2	10	2.55%
4.1.0.3	10	2.55%
4.0.1.1	9	2.30%
3.1.2J	9	2.30%
3.8.7.4	9	2.30%
4.1.0.4	8	2.04%
4.1.2.3	7	1.79%
3.6.2	7	1.79%
4.2.1.1	7	1.79%
3.9.1.2	6	1.53%
4.1.2.2	6	1.53%
4.2.1	6	1.53%
3.9.1	6	1.53%
3.5.1	5	1.28%
3.9.2.2	4	1.02%
4.1	4	1.02%
3.9.1.3	4	1.02%
4.0.0.1	4	1.02%
3.9.2.1	4	1.02%
3.5.2	4	1.02%
4.2.1.2	4	1.02%
Other	26	6.63%
Gordano Messaging Suite (GMS) (376 servers)
Version	Number of Servers	Percent
Other	376	100.00%
MagicMail (327 servers)
Version	Number of Servers	Percent
Other	327	100.00%
Mirapoint (187 servers)
Version	Number of Servers	Percent
3.10.10a-GA	20	10.70%
4.2.3-GA	16	8.56%
4.1.10-GA	15	8.02%
3.10.5-GA	12	6.42%
3.10.9-GA	11	5.88%
3.8.4-GA	11	5.88%
4.1.3-GA	10	5.35%
4.1.9-GA	9	4.81%
3.10.8-GA	7	3.74%
4.1.4-GA	6	3.21%
3.8.3-GA	6	3.21%
4.3.3-GA	6	3.21%
3.10.7-GA	6	3.21%
3.8.5-GA	5	2.67%
4.2.4-GA	5	2.67%
4.1.8-GA	5	2.67%
3.8.6-GA	4	2.14%
3.10.4-GA	3	1.60%
3.8.7a	3	1.60%
3.7.5a-GA	3	1.60%
3.10.3-GA	3	1.60%
4.1.5-GA	3	1.60%
4.3.4-GA	2	1.07%
3.7.1-GA	2	1.07%
4.3.1a-FCS	2	1.07%
4.0.5a	2	1.07%
Other	10	5.35%
VisNetic (152 servers)
Version	Number of Servers	Percent
9.3.2.0	43	28.29%
9.1.4.1	22	14.47%
8.5.0.8	11	7.24%
5.8.6.6	7	4.61%
5.5.8.3	7	4.61%
8.0.3.1	6	3.95%
7.6.1.0	6	3.95%
8.0.3	5	3.29%
6.2.2.0	4	2.63%
8.0.3.0	4	2.63%
7.2.4.1	4	2.63%
5.3.5.0	4	2.63%
5.4.5.4	3	1.97%
9.1.4.0	3	1.97%
5.0.2.3	3	1.97%
8.3.5.0	2	1.32%
5.0.2.1	2	1.32%
8.3.0.1	2	1.32%
6.0.9.0	2	1.32%
Other	12	7.89%
InterScan VirusWall (143 servers)
Version	Number of Servers	Percent
Other	143	100.00%
Mercury (59 servers)
Version	Number of Servers	Percent
1.48	32	54.24%
3.32	15	25.42%
3.21	2	3.39%
3.01a	2	3.39%
1.47	2	3.39%
3.21c	2	3.39%
3.30	2	3.39%
1.44	1	1.69%
4.x	1	1.69%
Other	0	0.00%
Interscan (54 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	12	22.22%
3.81-Build_1022	10	18.52%
3.55 (build 1029)	7	12.96%
3.53 (build 2017)	4	7.41%
3.8-Build_3013	4	7.41%
3.53 (build 1493)	3	5.56%
3.53 (build 2011)	3	5.56%
3.81-Build_1084	3	5.56%
3.53 (build 2013)	2	3.70%
3.81-Build_1055	1	1.85%
3.5 (build 1294)	1	1.85%
3.51 (build 1337)	1	1.85%
3.55 (build 1020)	1	1.85%
3.8-Build_3045	1	1.85%
3.8-Build_1080	1	1.85%
Other	0	0.00%
NetIQ MailMarshal (44 servers)
Version	Number of Servers	Percent
6.0.3.8	28	63.64%
5.5.6.7	5	11.36%
5.5.6.5	2	4.55%
5.5.6.6	2	4.55%
6.1.3.15	2	4.55%
5.5.5.6	1	2.27%
5.5.5.9	1	2.27%
5.5.4.17	1	2.27%
5.5.4.16	1	2.27%
5.5.3.17	1	2.27%
Other	0	0.00%
WebSTAR V (34 servers)
Version	Number of Servers	Percent
5.4.1	16	47.06%
5.4.0	9	26.47%
5.3.3	4	11.76%
5.3.4	3	8.82%
5.3.2	2	5.88%
Other	0	0.00%
Neon Mail Server (30 servers)
Version	Number of Servers	Percent
3.0.7	7	23.33%
3.1.3	6	20.00%
3.1.4	4	13.33%
3.1.0	4	13.33%
3.1.2	3	10.00%
3.0.9	2	6.67%
3.1.1	1	3.33%
3.0.8	1	3.33%
3.1.5	1	3.33%
3.0.6	1	3.33%
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%
OpenVMS (20 servers)
Version	Number of Servers	Percent
8.3	8	40.00%
7.3	5	25.00%
8.4	4	20.00%
6.1	1	5.00%
7.2	1	5.00%
8.2	1	5.00%
Other	0	0.00%
OpenSMTPD (18 servers)
Version	Number of Servers	Percent
Other	18	100.00%
ModusMail (13 servers)
Version	Number of Servers	Percent
4.35.477.0	5	38.46%
4.35.480.0	2	15.38%
4.1.361.21	1	7.69%
3.2.315.0	1	7.69%
4.0.340.3	1	7.69%
4.3.459.0	1	7.69%
4.35.477.8	1	7.69%
3.1.302.0	1	7.69%
Other	0	0.00%
WebSTAR (12 servers)
Version	Number of Servers	Percent
Other	12	100.00%
MAILsweeper (8 servers)
Version	Number of Servers	Percent
4.3.17.0	3	37.50%
4.3.20.0	2	25.00%
4.3.19.0	2	25.00%
4.3.1.0	1	12.50%
Other	0	0.00%