Outlook: Save Copy of Message to Windows Folder After Sending

[Ben]

Hi

We need to complete these actions after an email is sent:

Check for database connectivity & mapped drive connectivity
Prompt a use whether they want save a copy of the email to our Database, if
yes:
Access the database and give them a list of clients to save it against.
Save a copy of the sent email to the relevent location.
Add a database 'link' to the file.

Although the above steps are probably irrelevent, what is the best method
executing this each time an email is sent (also for ease of deployment)?

Using a rule
Custom send button
etc

Any help would be much apprecitated.

Thanks
B