The Email Watch Dog network maintains a network of distributed test email broadcast servers, as well as ISP test email points listed below. The graphic links for Inbound data represent how quickly email travels from a broadcast server to the ISP test email point. Outbound data is a time measurement of test emails sent from the ISP test point, back to the broadcast server located in Dulles, VA.

Emails are are transmitted from the Dulles, VA test email broadcaster every 5 minutes. The graph legend identifies each SMTP server an email travels through, and the plots identify the time it takes for the test email to travel through the servers. These email delay calculations are based solely on the ISP's SMTP server timestamp added to each email (header). Because we use the SMTP server's transaction timestamps, we observe ISPs unable to maintain an accurate clock. The delay calculations can generate a negative time if a server's time clock is running slow.

The below tables reference email delay graphs like this one: (For an explanation of graphs)

ISPs Monitored

Comcast
Cox
Grandecom
Mindspring
Time Warner RoadRunner
Yahoo

COMCAST Broadband (cable modem) - Denver,CO

Date	Inbound Worst Delay (hh:mm:ss) (graphs)	Inbound Average Delay (hh:mm:ss)	Outbound Worst Delay hh:mm:ss	Outbound Average Delay hh:mm:ss
4/30/2004	00:01:56	00:00:02	00:00:55	00:00:00
4/09/2004	00:00:56	00:00:02	00:00:51	00:00:00
3/25/2004	00:29:24	00:00:06	00:16:10	00:00:06
3/10/2004	00:07:59	00:00:05	00:13:56	00:00:38
2/16/2004	00:00:21	00:00:00	00:00:12	00:00:00
2/4/2004	00:51:28	00:06:06	00:15:21	00:00:17
1/29/2004	00:17:39	00:01:09	00:14:59	00:00:34
1/27/2004	03:11:24	00:08:34	00:29:58	00:01:46
1/22/2004	00:51:01	00:06:42	00:15:10	00:00:53
1/07/2004	01:07:27	00:02:27
12/11/2003	00:51:52	00:03:30	00:01:39	00:00:02
11/23/2003	02:29:14	00:07:59	00:15:00	00:00:28
11/17/2003	00:21:36	00:00:28	00:15:00	00:00:13
11/11/2003	00:39:54	00:00:50	00:14:58	00:00:13
11/03/2003	00:21:51	00:00:31	00:01:08	00:00:02
10/30/2003	01:39:56	00:01:38

COX Broadband (cable modem) - Tulsa, Ok

Date	Inbound Worst Delay (hh:mm:ss) (graphs)	Inbound Average Delay (hh:mm:ss)	Outbound Worst Delay hh:mm:ss	Outbound Average Delay hh:mm:ss
4/30/2004	00:00:57	00:00:02	00:00:51	00:00:00
4/09/2004	00:00:57	00:00:02	00:18:17	00:00:04
3/25/2004	00:29:19	00:00:18	04:00:32	00:01:46
3/10/2004	02:50:01	00:11:03	00:01:04	00:00:00
2/26/2004	00:06:46	00:00:10	00:00:15	00:00:00
2/04/2004	01:59:40	00:05:48	01:19:30	00:01:00
1/29/2004	00:20:48	00:01:05	02:44:33	00:01:06
1/27/2004	00:32:07	00:04:05	01:49:16	00:04:28
1/22/2004	01:41:42	00:07:05	01:05:09	00:00:37
1/07/2004	00:36:38	00:02:13	00:27:07	00:00:09
12/11/2003	00:34:54	00:03:41
11/17/2003	00:20:46	00:00:44
11/11/2003	00:26:44	00:00:35
11/03/2003	00:12:19	00:00:12
10/30/2003	00:19:45	00:00:36

GRANDECOM (cable modem) - Austin,TX

Date	Inbound Worst Delay (hh:mm:ss) (graphs)	Inbound Average Delay (hh:mm:ss)	Outbound Worst Delay hh:mm:ss	Outbound Average Delay hh:mm:ss
4/30/2004	00:00:56	00:00:55	00:19:59	00:00:03
4/09/2004	00:00:56	00:00:55	00:00:45	-00:00:01
3/25/2004	00:29:05	00:00:10	00:58:01	-00:00:13
3/10/2004	00:08:45	00:00:08	00:00:44	-00:00:01
2/26/2004	00:00:16	00:00:03	00:00:37	-00:00:01
2/04/2004	01:44:25	00:07:40	00:44:10	00:00:11
1/29/2004	00:24:17	00:01:08	00:26:57	00:00:25
1/27/2004	00:36:29	00:03:56	00:47:41	00:06:27
1/22/2004	01:41:16	00:08:03	00:21:25	00:00:19
1/07/2004	00:30:35	00:01:25	00:00:29	na
12/19/2003	00:35:04	00:02:52
12/11/2003	01:35:21	00:06:06
12/04/2003	00:24:52	00:01:21
11/21/2003	00:22:38	00:01:57

MINDSPRING (EARTHLINK dsl) - Atlanta,Ga

Date	Inbound Worst Delay (hh:mm:ss) (graphs)	Inbound Average Delay (hh:mm:ss)	Outbound Worst Delay hh:mm:ss	Outbound Average Delay hh:mm:ss
4/30/2004	00:02:01	00:00:53
4/09/2004	00:08:39	00:00:52
3/25/2004	00:29:13	00:00:06
3/10/2004	00:05:20	00:00:59
2/26/2004	00:26:41	00:00:08
2/4/2004	02:04:07	00:08:55
1/29/2004	00:30:43	00:01:53
1/27/2004	01:49:07	00:07:37
1/22/2004	01:25:44	00:07:08
1/07/2004	01:07:24	00:02:17
12/11/2003	01:03:02	00:03:26
11/23/2003	02:30:50	00:07:33
11/17/2003	00:20:13	00:00:17
11/16/2003	00:21:44	00:00:37

TIME WARNER (RR Cable Modem) - Austin,Tx

Date	Inbound Worst Delay (hh:mm:ss) (graphs)	Inbound Average Delay (hh:mm:ss)	Outbound Worst Delay hh:mm:ss	Outbound Average Delay hh:mm:ss
4/30/2004	00:22:48	00:00:21
4/09/2004	09:16:24	00:04:03
3/25/2004	02:43:33	00:02:03
3/10/2004	03:14:12	00:01:28
2/16/2004	05:40:40	00:01:24
2/04/2004	05:39:39	00:11:35
1/29/2004	01:56:24	00:04:33
1/27/2004	02:06:48	00:06:07
1/22/2004	02:33:54	00:12:35
1/07/2004	01:54:57	00:04:35
12/11/2003	04:08:34	00:18:27
11/23/2003	02:41:09	00:06:41
11/17/2003	04:01:12	00:06:58
11/11/2003	05:26:59	00:06:15
11/03/2003	04:02:04	00:04:50
11/01/2003	19:03:22	00:59:20

YAHOO

Date	Inbound Worst Delay (hh:mm:ss) (graphs)	Inbound Average Delay (hh:mm:ss)	Outbound Worst Delay hh:mm:ss	Outbound Average Delay hh:mm:ss
4/30/2004	00:26:41	00:00:16
4/09/2004	00:28:01	00:01:33
3/25/2004	01:00:04	00:01:58
3/10/2004	00:09:18	00:00:21
2/26/2004	00:26:42	00:00:20
2/4/2004	00:50:37	00:04:33
1/29/2004	00:28:17	00:01:19
1/27/2004	01:52:26	00:04:33
1/22/2004	01:44:56	00:07:16
1/07/2004	01:15:27	00:02:54
12/11/2003	01:09:49	00:03:51
11/23/2003	02:38:56	00:07:36
11/17/2003	00:18:47	00:00:24
11/11/2003	00:53:28	00:01:03
11/03/2003	00:26:41	00:00:31
11/01/2003	00:06:53	00:00:18