It sounds like you want to trigger an event when data changes, even though the change is made on an active server page instead of from within Access.
You may be able to get that sort of functionality using built-in features of Access 2010 using Access Macros and SharePoint 2010. That's probably not your case.
SQL Server also has trigger events. Upsizing Access data to SQL Server isn't that difficult, but you'd want to have a SQL Server expert available for administration.
With MS Access itself you could rig up a system where if the status is changed a flag is set indicating a change was made but the email is not sent. Then you could run a query and vba code, perhaps launched from a form timer event, to see if any emails need to be sent and if so, to send the emails.
To send the emails automatically without warning messages you could use CDO. There is a thread for that at
http://bytes.com/topic/access/answer...ail-cdo-access