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	1,685,596	100.0%
Number of Servers that didn't respond	239,504	14.21%
Server didn't open socket	230,642	13.68%
Server didn't provide banner	8,862	0.53%
Server provided banner	1,446,092	85.79%
Server banner identifies software in use	902,226	53.53%

As indicated by the above table, of the 1,685,596 servers queried, only 902,226 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	284,085	31.49%
Microsoft	191,260	21.20%
Exim	169,006	18.73%
Postfix	122,360	13.56%
IMail	36,341	4.03%
MDaemon	21,471	2.38%
MailEnable	19,629	2.18%
Merak	8,546	0.95%
Lotus Domino	8,217	0.91%
CommuniGate Pro	5,259	0.58%
Trend Micro	4,838	0.54%
WinWebMail	4,203	0.47%
Kerio	4,184	0.46%
GroupWise	4,165	0.46%
ArGoSoft	3,121	0.35%
XMail	2,451	0.27%
SurgeSMTP	1,758	0.19%
Gordano Messaging Suite (GMS)	1,598	0.18%
NetIQ MailMarshal	1,339	0.15%
Post.Office	1,246	0.14%
InterScan VirusWall	1,244	0.14%
Qmail Toaster	1,206	0.13%
Interscan	1,123	0.12%
ModusMail	711	0.08%
VisNetic	678	0.08%
Mirapoint	538	0.06%
WebSTAR V	321	0.04%
Mercury	319	0.04%
MAILsweeper	270	0.03%
MagicMail	245	0.03%
Neon Mail Server	164	0.02%
MessageWall	150	0.02%
WebSTAR	144	0.02%
OpenVMS	36	0.00%

Detailed Breakdown of Revisions on a Per-Server Basis

Sendmail (284,085 servers)
Version	Number of Servers	Percent
8.12.11.20060614	49,259	17.34%
8.12.11.20060308	36,130	12.72%
8.11.6	32,904	11.58%
8.13.6	28,248	9.94%
8.12.10	21,876	7.70%
8.13.1	21,738	7.65%
8.13.8	13,414	4.72%
8.12.11	13,340	4.70%
8.13.4	10,735	3.78%
8.12.8	9,947	3.50%
8.13.6.20060614	9,595	3.38%
8.10.2	6,653	2.34%
8.9.3	6,397	2.25%
8.13.7	6,341	2.23%
8.13.3	3,042	1.07%
Other	14,466	5.09%
Microsoft (191,260 servers)
Version	Number of Servers	Percent
6.0.3790.1830	130,257	68.10%
5.0.2195.6713	33,960	17.76%
6.0.3790.211	17,415	9.11%
6.0.3790.0	2,604	1.36%
5.5.2653.13	2,452	1.28%
Other	4,572	2.39%
Exim (169,006 servers)
Version	Number of Servers	Percent
4.63	108,650	64.29%
4.52	20,426	12.09%
4.50	10,703	6.33%
4.60	7,420	4.39%
4.62	4,035	2.39%
4.44	2,921	1.73%
4.66	2,245	1.33%
3.36	1,845	1.09%
Other	10,761	6.37%
Postfix (122,360 servers)
Version	Number of Servers	Percent
Other	122,360	100.00%
IMail (36,341 servers)
Version	Number of Servers	Percent
8.15	7,871	21.66%
8.22	6,017	16.56%
8.05	4,508	12.40%
9.10	4,505	12.40%
6.06	1,871	5.15%
7.15	1,537	4.23%
7.07	1,489	4.10%
8.21	1,416	3.90%
9.04	728	2.00%
8.00	639	1.76%
8.20	611	1.68%
8.10	530	1.46%
8.12	439	1.21%
8.02	425	1.17%
8.13	384	1.06%
Other	3,371	9.28%
MDaemon (21,471 servers)
Version	Number of Servers	Percent
9.5.4	3,957	18.43%
8.1.3	1,612	7.51%
9.0.4	1,296	6.04%
9.5.3	1,069	4.98%
6.8.5	996	4.64%
7.2.3	815	3.80%
7.2.0	730	3.40%
9.0.1	681	3.17%
8.1.4	649	3.02%
9.5.1	621	2.89%
9.5.5	601	2.80%
9.0.6	597	2.78%
9.0.0	574	2.67%
9.5.2	555	2.58%
8.0.2	534	2.49%
9.0.7	478	2.23%
8.0.3	444	2.07%
8.1.1	439	2.04%
8.1.5	397	1.85%
7.1.2	393	1.83%
7.1.0	340	1.58%
7.2.2	337	1.57%
9.0.5	330	1.54%
6.8.4	304	1.42%
8.0.1	286	1.33%
7.0.1	284	1.32%
7.2.1	283	1.32%
Other	1,869	8.70%
MailEnable (19,629 servers)
Version	Number of Servers	Percent
1.96--	2,218	11.30%
1.9--	2,204	11.23%
1.8--	2,079	10.59%
1.95--	1,875	9.55%
1.981--	1,446	7.37%
0-2.36-	1,203	6.13%
0-1.84-	588	3.00%
0-1.841-	516	2.63%
0-1.6-	506	2.58%
0--2.36	496	2.53%
0-1.75-	469	2.39%
0-1.54-	412	2.10%
0-2.32-	345	1.76%
1.73--	310	1.58%
0-1.79-	302	1.54%
0-2.35-	300	1.53%
0-2.11-	221	1.13%
1.91--	203	1.03%
0-2.2-	200	1.02%
1.71--	200	1.02%
Other	3,536	18.01%
Merak (8,546 servers)
Version	Number of Servers	Percent
8.0.3	1,865	21.82%
8.9.1	1,385	16.21%
8.5.0	1,146	13.41%
8.3.8	490	5.73%
7.4.5	414	4.84%
8.9.0	342	4.00%
7.5.2	331	3.87%
7.6.4	328	3.84%
7.4.2	207	2.42%
8.2.4	181	2.12%
7.2.0	173	2.02%
6.2.1	139	1.63%
8.3.0	115	1.35%
7.4.0	102	1.19%
7.6.1	91	1.06%
Other	1,237	14.47%
Lotus Domino (8,217 servers)
Version	Number of Servers	Percent
7.0.2	794	9.66%
6.5.4	766	9.32%
7.0.1	727	8.85%
6.5.1	694	8.45%
6.5.3	561	6.83%
6.5.5	501	6.10%
7.0	446	5.43%
6.5	367	4.47%
5.0.11	320	3.89%
6.5.2	297	3.61%
5.0.12	223	2.71%
7.0.1FP1	198	2.41%
5.0.8	168	2.04%
5.0.10	161	1.96%
5.0.13a	150	1.83%
6.0.2CF1	141	1.72%
6.5.4FP2	136	1.66%
6.0.3	117	1.42%
6.0	116	1.41%
6.5.4FP3	110	1.34%
6.5.5FP1	109	1.33%
6.5.5FP2	105	1.28%
6.5.4FP1	102	1.24%
5.0.9	92	1.12%
5.0.5	85	1.03%
Other	731	8.90%
CommuniGate Pro (5,259 servers)
Version	Number of Servers	Percent
4.1.8	766	14.57%
4.2.10	520	9.89%
5.0.9	384	7.30%
5.1.5	221	4.20%
5.1.3	190	3.61%
5.0.8	153	2.91%
4.2.8	149	2.83%
5.1.4	139	2.64%
4.2	133	2.53%
5.0.11	131	2.49%
4.2.7	128	2.43%
5.1.2	121	2.30%
4.2.9	119	2.26%
4.3.8	117	2.22%
4.3.6	106	2.02%
4.0.6	106	2.02%
4.0.1	96	1.83%
3.5.9	88	1.67%
5.0.13	88	1.67%
5.0.10	77	1.46%
5.1.1	76	1.45%
5.0.6	74	1.41%
4.3.12	68	1.29%
4.2.4	60	1.14%
5.0.12	59	1.12%
5.1	57	1.08%
4.2.6	56	1.06%
Other	977	18.58%
Trend Micro (4,838 servers)
Version	Number of Servers	Percent
5.5	2,542	52.54%
5.7	1,740	35.97%
5.18	488	10.09%
Other	68	1.41%
WinWebMail (4,203 servers)
Version	Number of Servers	Percent
3.7.1.1	1,209	28.77%
3.6.3.1	853	20.30%
3.7.3.1	730	17.37%
3.7.0.5	545	12.97%
3.7.0.7	443	10.54%
3.7.0.3	373	8.87%
Other	50	1.19%
Kerio (4,184 servers)
Version	Number of Servers	Percent
6.3.1	1,001	23.92%
6.3.0	720	17.21%
6.2.2	352	8.41%
6.2.0	226	5.40%
6.1.3	220	5.26%
6.1.2	204	4.88%
6.1.4	199	4.76%
6.1.0	183	4.37%
6.0.10	148	3.54%
6.1.1	102	2.44%
6.0.3	91	2.17%
6.2.1	84	2.01%
6.0.8	64	1.53%
5.7.10	60	1.43%
6.0.9	58	1.39%
6.0.6	47	1.12%
6.0.7	45	1.08%
Other	380	9.08%
GroupWise (4,165 servers)
Version	Number of Servers	Percent
7.0.1	1,247	29.94%
6.5.4	571	13.71%
6.0.4	300	7.20%
7.0	297	7.13%
6.5.7	276	6.63%
6.5.6	274	6.58%
6.5.5	258	6.19%
6.5.1	215	5.16%
6.5.3	123	2.95%
6.5.2	120	2.88%
6.0.2	98	2.35%
6.0.3	86	2.06%
5.5.5	73	1.75%
6.5.0	61	1.46%
6.0.1	59	1.42%
Other	107	2.57%
ArGoSoft (3,121 servers)
Version	Number of Servers	Percent
1.8 (1.8.8.8)	1,165	37.33%
1.8 (1.8.8.7)	613	19.64%
1.8 (1.8.8.1)	111	3.56%
1.8 (1.8.8.9	100	3.20%
1.8 (1.8.6.0)	98	3.14%
1.8 (1.8.8.3)	78	2.50%
1.8 (1.8.8.5)	75	2.40%
1.8 (1.8.8.2)	75	2.40%
1.8 (1.8.8.4)	59	1.89%
1.8 (1.8.5.9)	56	1.79%
1.8 (1.8.7.5)	48	1.54%
1.8 (1.8.6.6)	40	1.28%
1.8 (1.8.8.6)	40	1.28%
1.8 (1.8.7.6)	37	1.19%
Other	526	16.85%
XMail (2,451 servers)
Version	Number of Servers	Percent
1.22	985	40.19%
1.21	459	18.73%
1.20	223	9.10%
1.17	192	7.83%
1.23	141	5.75%
1.24	125	5.10%
1.12	73	2.98%
1.18	64	2.61%
1.16	40	1.63%
1.10	37	1.51%
1.15	28	1.14%
1.11	26	1.06%
Other	58	2.37%
SurgeSMTP (1,758 servers)
Version	Number of Servers	Percent
3.8f2-2	492	27.99%
3.7b8-8	331	18.83%
3.8f3-3	217	12.34%
3.6f5-5	143	8.13%
3.5b3-3	86	4.89%
3.0c2-2	79	4.49%
3.7b6-6	56	3.19%
3.8g-7	48	2.73%
2.1c7-7	30	1.71%
2.0g2-1	23	1.31%
1.8g3	21	1.19%
Other	232	13.20%
Gordano Messaging Suite (GMS) (1,598 servers)
Version	Number of Servers	Percent
Other	1,598	100.00%
NetIQ MailMarshal (1,339 servers)
Version	Number of Servers	Percent
6.0.3.8	979	73.11%
5.5.6.7	94	7.02%
6.1.3.15	68	5.08%
5.5.4.16	37	2.76%
5.5.5.9	35	2.61%
5.5.6.6	28	2.09%
5.5.6.5	24	1.79%
5.5.5.6	16	1.19%
5.5.4.17	16	1.19%
Other	42	3.14%
Post.Office (1,246 servers)
Version	Number of Servers	Percent
3.5.3	409	32.83%
3.5.3J	123	9.87%
3.8.3	73	5.86%
3.6.3	71	5.70%
3.6.2	52	4.17%
4.0.1	50	4.01%
3.1.2J	46	3.69%
3.1.2	38	3.05%
3.9.1	38	3.05%
3.9.2	30	2.41%
3.8.4	30	2.41%
3.5.2	26	2.09%
3.9.0	25	2.01%
3.6.0	24	1.93%
4.0.0.2	22	1.77%
3.8.7.4	21	1.69%
4.0.0.1	17	1.36%
3.9.1.3	15	1.20%
3.9.2.3	15	1.20%
3.8.2	13	1.04%
Other	108	8.67%
InterScan VirusWall (1,244 servers)
Version	Number of Servers	Percent
Other	1,244	100.00%
Qmail Toaster (1,206 servers)
Version	Number of Servers	Percent
1.3	560	46.43%
1.2	527	43.70%
1.0	118	9.78%
Other	1	0.08%
Interscan (1,123 servers)
Version	Number of Servers	Percent
3.55 (build 1016)	253	22.53%
3.81-Build_1022	138	12.29%
3.8-Build_3013	115	10.24%
3.55 (build 1029)	103	9.17%
3.53 (build 2011)	93	8.28%
3.53 (build 2017)	90	8.01%
3.53 (build 2013)	55	4.90%
3.55 (build 1020)	41	3.65%
3.53 (build 1493)	34	3.03%
3.52 (build 1375)	31	2.76%
3.8-Build_1080	23	2.05%
3.81-Build_1084	16	1.42%
3.8-Build_3065	14	1.25%
3.81-Build_1021	12	1.07%
Other	105	9.35%
ModusMail (711 servers)
Version	Number of Servers	Percent
4.35.480.0	419	58.93%
4.35.480.11	44	6.19%
3.2.315.0	38	5.34%
4.1.361.21	29	4.08%
3.1.302.0	25	3.52%
4.2.425.22	25	3.52%
4.35.477.0	24	3.38%
4.2.425.16	23	3.23%
3.1.297.0	19	2.67%
4.3.459.0	17	2.39%
4.2.425.4	9	1.27%
4.1.361.0	9	1.27%
Other	30	4.22%
VisNetic (678 servers)
Version	Number of Servers	Percent
8.5.0.8	107	15.78%
7.2.4.1	67	9.88%
5.8.6.6	48	7.08%
8.0.3.0	48	7.08%
8.3.5.0	41	6.05%
5.0.2.3	41	6.05%
8.0.3.1	36	5.31%
6.2.2.0	35	5.16%
7.6.1.0	34	5.01%
5.5.8.3	33	4.87%
8.3.6	25	3.69%
8.5.0.5	25	3.69%
5.3.5.0	17	2.51%
8.0.3	17	2.51%
5.4.5.4	17	2.51%
7.5.3.0	15	2.21%
8.3.0.1	12	1.77%
5.8.6.4	10	1.47%
7.2.4.0	9	1.33%
Other	41	6.05%
Mirapoint (538 servers)
Version	Number of Servers	Percent
3.7.5a-GA	102	18.96%
3.8.2-GA	88	16.36%
3.8.3-GA	58	10.78%
3.7.3a-GA	54	10.04%
3.7.4b-GA	47	8.74%
3.7.5-GA	33	6.13%
3.7.2-GA	21	3.90%
3.5.8-GR	18	3.35%
3.7.1-GA	17	3.16%
1.1.0	11	2.04%
3.7.0-GA	10	1.86%
3.8.0-FCS	10	1.86%
3.6.6-GR	7	1.30%
3.6.4-CR	6	1.12%
3.8.1-FCS	6	1.12%
3.7.3-GA	6	1.12%
Other	44	8.18%
WebSTAR V (321 servers)
Version	Number of Servers	Percent
5.4.1	97	30.22%
5.4.0	90	28.04%
5.3.4	68	21.18%
5.3.3	30	9.35%
5.3.2	20	6.23%
5.3.0	10	3.12%
Other	6	1.87%
Mercury (319 servers)
Version	Number of Servers	Percent
1.48	134	42.01%
3.32	118	36.99%
3.21c	26	8.15%
3.31	14	4.39%
1.44	11	3.45%
1.47	7	2.19%
3.01a	5	1.57%
Other	4	1.25%
MAILsweeper (270 servers)
Version	Number of Servers	Percent
4.3.20.0	44	16.30%
4.3.17.0	43	15.93%
4.3.12.0	43	15.93%
4.3.14.0	37	13.70%
4.3.19.0	34	12.59%
4.2.10.0	16	5.93%
4.3.1.0	13	4.81%
4.2.1.0	11	4.07%
4.3.10.0	11	4.07%
4.2.5.0	9	3.33%
4.3.6.0	6	2.22%
Other	3	1.11%
MagicMail (245 servers)
Version	Number of Servers	Percent
Other	245	100.00%
Neon Mail Server (164 servers)
Version	Number of Servers	Percent
3.0.9	80	48.78%
3.0.7	64	39.02%
3.0.8	9	5.49%
3.0.6	7	4.27%
3.0.4	2	1.22%
3.0.5	2	1.22%
Other	0	0.00%
MessageWall (150 servers)
Version	Number of Servers	Percent
1.0.8	116	77.33%
1.0.11	16	10.67%
1.1.23	7	4.67%
1.0.6	4	2.67%
1.1.0	3	2.00%
Other	4	2.67%
WebSTAR (144 servers)
Version	Number of Servers	Percent
Other	144	100.00%
OpenVMS (36 servers)
Version	Number of Servers	Percent
7.3	13	36.11%
8.2	10	27.78%
7.2	7	19.44%
8.3	5	13.89%
6.1	1	2.78%
Other	0	0.00%