Exchange 2003 , email delayed in sending

Just a quick question to give me a more of an understanding as to what is going on.


Server : Microsoft Exchange 2003

We use Websence formally known as Mailcontrol for our Email screening, ie all inbound emails hit mailcontrol servers first for virus and spam scanning , and all outbound mail are forwarded to mailcontol too before they hit the recipient .

A few emails to the same email domain were sent with the following problem, below is one email in question. This is only what i can tell happening to this reciepient domain, all other emails seem fine.

The below was extracted from Exchange Message tracking centre.  

13:06      SMTP: Message Submitted to Advance Queuing                        1019
13:06      SMTP: Started Message Submission to Advanced Queue                  1025
13:06      SMTP: Message Submitted to Categorizer                              1024
13:06      SMTP: Message Categorized and Queued for Routing                  1033
13:06      SMTP: Message Routed and Queued for Remote Delivery                  1034
13:06      SMTP: Message Categorized and Queued for Routing                  1033
13:06       SMTP: Message Queued for Local Delivery                              1036
13:06      SMTP: Message Delivered Locally to multiple recipients                  1023
13:06      SMTP: Store Driver Message Delivered Locally to store to (int email)      1028
13:06      SMTP: Store Driver Message Delivered Locally to store to (int email)      1028
13:06      SMTP: Store Driver Message Delivered Locally to store to (int email)      1028
13:08      SMTP: Started Outbound Transfer of Message                        1020
13:09      SMTP: Message transferred to ************************ through SMTP   1031
13:10      SMTP: Started Outbound Transfer of Message                        1020
13:11      SMTP: Message transferred to ************************ through SMTP   1031
15:52      SMTP: Started Outbound Transfer of Message                        1020
15:53      SMTP: Message transferred to ************************ through SMTP   1031


Email was sent at 13:06 to a few internal and one external email account.
Internal was delivered instantly.  External what I can make out tried a couple of times then succeeded at  15:53 almost 3 hours later.

Looked at the mailcontrol site and they received the email at 15:53 .

Email size had an attachment, whole email size was 0.5 MB  .  No rules in exchange to stop such small attachment sizes.

My questions.

1.      What is the ************************ for ?
2.      what could have caused the delay?


Many thanks