youll be needing a table that will hold the message you want to send.
fields should include:
member id
email address (or linked to main member table)
message
attachments (optional)
date to send
sent status
hidden form that will act as messenger.
the form has a Timer event.
check if there is unsent message from the above table periodically.
send message using Outlook automation.
update the Sent Status of the table.