Responding to the Recipient
You have a targeted list of opt-in recipients, so the email will go to people who have given their permission to receive it. You've provided opportunities for updating user information, so the list should be pretty up to date.
Great. Ready to send out that email!
Wait. Did you inform the marketing department that their email is about to go out?
Your marketing staff needs to be kept up to date so that they're fully prepared to respond to inquiries. Nothing looks worse to a user who has just received an offer than to contact your organization and reach someone who doesn't have a clue what the user is talking about!