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	1,760,582	100.0%
Number of Servers that didn't respond	258,105	14.66%
Server didn't open socket	248,532	14.12%
Server didn't provide banner	9,573	0.54%
Server provided banner	1,502,477	85.34%
Server banner identifies software in use	916,635	52.06%

As indicated by the above table, of the 1,760,582 servers queried, only 916,635 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
Sendmail	264,802	28.89%
Microsoft	202,079	22.05%
Exim	184,018	20.08%
Postfix	135,839	14.82%
IMail	30,317	3.31%
MDaemon	22,251	2.43%
MailEnable	21,234	2.32%
Merak	8,734	0.95%
Lotus Domino	7,617	0.83%
CommuniGate Pro	5,247	0.57%
Kerio	4,862	0.53%
WinWebMail	4,520	0.49%
Trend Micro	4,385	0.48%
GroupWise	3,552	0.39%
ArGoSoft	2,997	0.33%
XMail	2,553	0.28%
SurgeSMTP	1,818	0.20%
Qmail Toaster	1,457	0.16%
Gordano Messaging Suite (GMS)	1,333	0.15%
Post.Office	1,103	0.12%
InterScan VirusWall	993	0.11%
NetIQ MailMarshal	984	0.11%
Interscan	837	0.09%
VisNetic	611	0.07%
Mirapoint	567	0.06%
ModusMail	490	0.05%
MagicMail	296	0.03%
Mercury	267	0.03%
WebSTAR V	259	0.03%
Neon Mail Server	185	0.02%
MAILsweeper	166	0.02%
MessageWall	118	0.01%
WebSTAR	109	0.01%
OpenVMS	35	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Sendmail (264,802 servers)
Version	Number of Servers	Percent
8.12.11.20060614	44,503	16.81%
8.12.11.20060308	32,626	12.32%
8.11.6	26,492	10.00%
8.13.1	26,276	9.92%
8.13.6	25,223	9.53%
8.12.10	18,414	6.95%
8.13.8	14,584	5.51%
8.12.11	11,286	4.26%
8.13.6.20060614	10,202	3.85%
8.13.4	9,047	3.42%
8.12.8	8,079	3.05%
8.14.1	7,124	2.69%
8.13.7	6,055	2.29%
8.10.2	4,943	1.87%
8.9.3	4,827	1.82%
Other	15,121	5.71%
Microsoft (202,079 servers)
Version	Number of Servers	Percent
6.0.3790.1830	81,405	40.28%
6.0.3790.3959	74,811	37.02%
5.0.2195.6713	26,771	13.25%
6.0.3790.211	12,131	6.00%
Other	6,961	3.44%
Exim (184,018 servers)
Version	Number of Servers	Percent
4.63	76,385	41.51%
4.66	64,899	35.27%
4.50	8,691	4.72%
4.60	7,674	4.17%
4.52	5,045	2.74%
4.67	4,835	2.63%
4.62	3,962	2.15%
4.44	2,289	1.24%
Other	10,238	5.56%
Postfix (135,839 servers)
Version	Number of Servers	Percent
Other	135,839	100.00%
IMail (30,317 servers)
Version	Number of Servers	Percent
8.22	5,812	19.17%
8.15	5,409	17.84%
8.05	3,540	11.68%
9.10	2,792	9.21%
9.20	1,869	6.16%
9.21	1,254	4.14%
7.15	1,250	4.12%
7.07	1,220	4.02%
6.06	934	3.08%
8.21	831	2.74%
8.00	633	2.09%
8.10	488	1.61%
8.20	439	1.45%
9.04	352	1.16%
8.12	330	1.09%
8.02	317	1.05%
Other	2,847	9.39%
MDaemon (22,251 servers)
Version	Number of Servers	Percent
9.6.1	4,140	18.61%
9.5.6	2,382	10.71%
8.1.3	1,318	5.92%
9.0.4	1,141	5.13%
9.6.0	970	4.36%
6.8.5	809	3.64%
9.5.1	707	3.18%
9.5.2	696	3.13%
7.2.3	692	3.11%
7.2.0	587	2.64%
9.5.5	575	2.58%
9.5.4	566	2.54%
9.0.1	552	2.48%
8.1.4	511	2.30%
9.0.0	472	2.12%
8.0.2	456	2.05%
9.5.3	413	1.86%
8.1.1	372	1.67%
7.1.2	319	1.43%
9.0.7	318	1.43%
8.1.5	309	1.39%
8.0.3	297	1.33%
7.1.0	280	1.26%
9.0.6	279	1.25%
7.2.2	272	1.22%
7.2.1	257	1.16%
9.6.2	253	1.14%
6.8.4	230	1.03%
8.0.1	227	1.02%
Other	1,851	8.32%
MailEnable (21,234 servers)
Version	Number of Servers	Percent
1.981--	4,593	21.63%
1.96--	2,097	9.88%
1.95--	1,686	7.94%
0-2.37-	1,604	7.55%
1.9--	1,597	7.52%
1.8--	1,498	7.05%
0-1.85-	1,084	5.11%
0--2.37	724	3.41%
0-2.36-	648	3.05%
0-2.38-	586	2.76%
1.983--	510	2.40%
0--2.38	448	2.11%
0-1.841-	299	1.41%
0-1.75-	215	1.01%
Other	3,645	17.17%
Merak (8,734 servers)
Version	Number of Servers	Percent
8.9.1	2,347	26.87%
8.0.3	2,041	23.37%
8.5.0	725	8.30%
8.3.8	348	3.98%
7.4.5	342	3.92%
7.5.2	329	3.77%
7.6.4	283	3.24%
9.0.0	205	2.35%
7.4.2	177	2.03%
8.9.0	167	1.91%
8.2.4	143	1.64%
7.2.0	140	1.60%
6.2.1	100	1.14%
8.3.0	95	1.09%
7.4.0	89	1.02%
Other	1,203	13.77%
Lotus Domino (7,617 servers)
Version	Number of Servers	Percent
7.0.2	996	13.08%
7.0.1	586	7.69%
6.5.4	578	7.59%
6.5.1	536	7.04%
6.5.3	424	5.57%
7.0.2FP1	404	5.30%
6.5.5	389	5.11%
7.0	365	4.79%
7.0.2FP2	356	4.67%
6.5	299	3.93%
6.5.2	231	3.03%
5.0.11	229	3.01%
5.0.12	156	2.05%
6.5.5FP2	144	1.89%
7.0.1FP1	140	1.84%
5.0.8	138	1.81%
5.0.13a	125	1.64%
5.0.10	117	1.54%
6.0.2CF1	106	1.39%
6.5.4FP2	98	1.29%
6.5.4FP3	93	1.22%
6.0	91	1.19%
6.0.3	85	1.12%
Other	931	12.22%
CommuniGate Pro (5,247 servers)
Version	Number of Servers	Percent
4.1.8	648	12.35%
4.2.10	450	8.58%
5.1.10	320	6.10%
5.0.9	244	4.65%
5.1.9	233	4.44%
5.1.11	203	3.87%
5.1.8	191	3.64%
5.0.13	185	3.53%
5.1.7	182	3.47%
4.3.12	127	2.42%
4.2.8	123	2.34%
4.2.7	114	2.17%
4.2	111	2.12%
5.0.11	104	1.98%
5.0.8	103	1.96%
4.2.9	98	1.87%
4.0.1	94	1.79%
5.1.3	91	1.73%
5.1.5	87	1.66%
4.0.6	84	1.60%
5.1.6	82	1.56%
4.3.8	72	1.37%
5.1.4	70	1.33%
3.5.9	62	1.18%
5.1.2	59	1.12%
5.1.1	53	1.01%
Other	1,057	20.14%
Kerio (4,862 servers)
Version	Number of Servers	Percent
6.3.1	1,249	25.69%
6.4.0	1,193	24.54%
6.4.1	401	8.25%
6.3.0	375	7.71%
6.2.2	174	3.58%
6.1.3	147	3.02%
6.2.0	137	2.82%
6.1.0	134	2.76%
6.1.2	133	2.74%
6.0.10	119	2.45%
6.1.4	108	2.22%
6.0.3	78	1.60%
6.1.1	72	1.48%
6.2.1	56	1.15%
6.0.8	53	1.09%
Other	433	8.91%
WinWebMail (4,520 servers)
Version	Number of Servers	Percent
3.7.3.1	1,661	36.75%
3.7.1.1	1,039	22.99%
3.6.3.1	662	14.65%
3.7.0.5	483	10.69%
3.7.0.7	332	7.35%
3.7.0.3	290	6.42%
Other	53	1.17%
Trend Micro (4,385 servers)
Version	Number of Servers	Percent
5.5	1,944	44.33%
5.7	1,877	42.81%
5.18	459	10.47%
5.15	44	1.00%
Other	61	1.39%
GroupWise (3,552 servers)
Version	Number of Servers	Percent
7.0.2	756	21.28%
7.0.1	694	19.54%
6.5.7	435	12.25%
6.5.4	322	9.07%
6.5.6	235	6.62%
6.0.4	215	6.05%
7.0	165	4.65%
6.5.5	154	4.34%
6.5.1	138	3.89%
6.5.3	68	1.91%
6.0.2	64	1.80%
6.5.2	61	1.72%
6.0.3	57	1.60%
5.5.5	50	1.41%
6.0.1	37	1.04%
Other	101	2.84%
ArGoSoft (2,997 servers)
Version	Number of Servers	Percent
1.8 (1.8.9.1)	781	26.06%
1.8 (1.8.8.8)	521	17.38%
1.8 (1.8.8.7)	391	13.05%
1.8 (1.8.8.9)	217	7.24%
1.8 (1.8.9.0)	131	4.37%
1.8 (1.8.8.1)	82	2.74%
1.8 (1.8.8.2)	66	2.20%
1.8 (1.8.6.0)	64	2.14%
1.8 (1.8.8.3)	57	1.90%
1.8 (1.8.5.9)	43	1.43%
1.8 (1.8.8.5)	42	1.40%
1.8 (1.8.7.5)	42	1.40%
1.8 (1.8.8.4)	38	1.27%
1.8 (1.8.8.9	36	1.20%
1.8 (1.8.6.6)	30	1.00%
Other	456	15.22%
XMail (2,553 servers)
Version	Number of Servers	Percent
1.22	887	34.74%
1.24	451	17.67%
1.21	394	15.43%
1.20	187	7.32%
1.17	167	6.54%
1.23	146	5.72%
1.12	90	3.53%
1.18	51	2.00%
1.16	41	1.61%
1.10	28	1.10%
Other	111	4.35%
SurgeSMTP (1,818 servers)
Version	Number of Servers	Percent
3.8i3-3	708	38.94%
3.8f3-3	178	9.79%
3.7b8-8	174	9.57%
3.8f2-2	109	6.00%
3.6f5-5	105	5.78%
3.8i-1	104	5.72%
3.5b3-3	68	3.74%
3.0c2-2	56	3.08%
3.7b6-6	45	2.48%
3.8k-1	36	1.98%
2.0g2-1	22	1.21%
2.1c7-7	20	1.10%
Other	193	10.62%
Qmail Toaster (1,457 servers)
Version	Number of Servers	Percent
1.3	917	62.94%
1.2	445	30.54%
1.0	95	6.52%
Other	0	0.00%
Gordano Messaging Suite (GMS) (1,333 servers)
Version	Number of Servers	Percent
Other	1,333	100.00%
Post.Office (1,103 servers)
Version	Number of Servers	Percent
3.5.3	313	28.38%
3.5.3J	95	8.61%
4.0.1	90	8.16%
3.8.3	70	6.35%
3.6.3	60	5.44%
3.6.2	44	3.99%
3.1.2J	41	3.72%
3.9.1	38	3.45%
3.1.2	32	2.90%
3.9.2.3	29	2.63%
3.9.2	29	2.63%
3.9.0	26	2.36%
3.8.4	25	2.27%
3.8.7.4	22	1.99%
3.5.2	22	1.99%
4.0.0.2	21	1.90%
3.6.0	16	1.45%
3.9.1.3	14	1.27%
3.8.2	12	1.09%
3.9.2.1	12	1.09%
4.0.0.1	12	1.09%
Other	80	7.25%
InterScan VirusWall (993 servers)
Version	Number of Servers	Percent
Other	993	100.00%
NetIQ MailMarshal (984 servers)
Version	Number of Servers	Percent
6.0.3.8	742	75.41%
6.1.3.15	56	5.69%
5.5.6.7	54	5.49%
5.5.4.16	25	2.54%
5.5.6.6	24	2.44%
5.5.6.5	20	2.03%
5.5.5.9	15	1.52%
5.5.5.6	14	1.42%
Other	34	3.46%
Interscan (837 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	172	20.55%
3.81-Build_1022	108	12.90%
3.8-Build_3013	85	10.16%
3.53 (build 2011)	71	8.48%
3.55 (build 1029)	69	8.24%
3.53 (build 2017)	64	7.65%
3.81-Build_1084	48	5.73%
3.53 (build 2013)	34	4.06%
3.55 (build 1020)	29	3.46%
3.53 (build 1493)	28	3.35%
3.52 (build 1375)	26	3.11%
3.8-Build_3065	12	1.43%
3.8-Build_1080	12	1.43%
Other	79	9.44%
VisNetic (611 servers)
Version	Number of Servers	Percent
8.5.0.8	126	20.62%
7.2.4.1	49	8.02%
8.0.3.0	42	6.87%
5.8.6.6	39	6.38%
8.3.5.0	38	6.22%
8.0.3.1	34	5.56%
6.2.2.0	33	5.40%
5.0.2.3	32	5.24%
7.6.1.0	30	4.91%
5.5.8.3	27	4.42%
5.3.5.0	16	2.62%
8.0.3	16	2.62%
8.5.0.5	15	2.45%
8.3.6	14	2.29%
5.4.5.4	12	1.96%
7.5.3.0	10	1.64%
8.3.0.1	9	1.47%
5.0.1	8	1.31%
5.8.6.4	8	1.31%
8.9.2.0	8	1.31%
7.2.4.0	7	1.15%
Other	38	6.22%
Mirapoint (567 servers)
Version	Number of Servers	Percent
3.8.3-GA	121	21.34%
3.8.4-GA	109	19.22%
3.7.5a-GA	84	14.81%
3.8.2-GA	65	11.46%
3.7.3a-GA	39	6.88%
3.7.4b-GA	33	5.82%
3.7.5-GA	18	3.17%
3.8.5-GA	15	2.65%
3.5.8-GR	10	1.76%
1.1.0	9	1.59%
3.7.2-GA	9	1.59%
3.7.1-GA	9	1.59%
3.7.0-GA	6	1.06%
3.7.3-GA	6	1.06%
Other	34	6.00%
ModusMail (490 servers)
Version	Number of Servers	Percent
4.35.480.0	294	60.00%
3.2.315.0	32	6.53%
4.1.361.21	31	6.33%
4.2.425.22	25	5.10%
4.35.477.0	22	4.49%
3.1.297.0	17	3.47%
3.1.302.0	11	2.24%
3.0.273.0	11	2.24%
4.35.480.11	10	2.04%
4.3.459.0	5	1.02%
4.2.425.4	5	1.02%
Other	27	5.51%
MagicMail (296 servers)
Version	Number of Servers	Percent
Other	296	100.00%
Mercury (267 servers)
Version	Number of Servers	Percent
1.48	119	44.57%
3.32	96	35.96%
3.21c	20	7.49%
3.31	12	4.49%
1.44	10	3.75%
1.47	5	1.87%
Other	5	1.87%
WebSTAR V (259 servers)
Version	Number of Servers	Percent
5.4.0	79	30.50%
5.4.1	67	25.87%
5.3.4	57	22.01%
5.3.3	23	8.88%
5.3.2	20	7.72%
5.3.0	9	3.47%
5.2.4	3	1.16%
Other	1	0.39%
Neon Mail Server (185 servers)
Version	Number of Servers	Percent
3.0.9	74	40.00%
3.0.7	54	29.19%
3.1.0	37	20.00%
3.0.8	8	4.32%
3.0.6	8	4.32%
3.0.4	2	1.08%
3.0.5	2	1.08%
Other	0	0.00%
MAILsweeper (166 servers)
Version	Number of Servers	Percent
4.3.20.0	34	20.48%
4.3.12.0	25	15.06%
4.3.17.0	24	14.46%
4.3.14.0	23	13.86%
4.3.19.0	19	11.45%
4.2.10.0	9	5.42%
4.3.10.0	8	4.82%
4.3.1.0	6	3.61%
4.3.6.0	6	3.61%
4.2.5.0	5	3.01%
4.2.1.0	4	2.41%
4.1.2.0	2	1.20%
Other	1	0.60%
MessageWall (118 servers)
Version	Number of Servers	Percent
1.0.8	89	75.42%
1.0.11	17	14.41%
1.1.23	7	5.93%
1.1.0	3	2.54%
1.0.6	2	1.69%
Other	0	0.00%
WebSTAR (109 servers)
Version	Number of Servers	Percent
Other	109	100.00%
OpenVMS (35 servers)
Version	Number of Servers	Percent
7.3	12	34.29%
8.2	9	25.71%
8.3	8	22.86%
7.2	5	14.29%
6.1	1	2.86%
Other	0	0.00%