Constant Contact allows you to schedule individual emails so your clients receive them at opportune times, but the service also allows you to set up campaigns or bulk mailings on a specific schedule.
Contact Constant Contact’s AppConnect team.
Verify your legitimacy with your Constant Contact username and API key.
Create a campaign through the system’s user interface or using the application program interface.
Enter the API website address provided to you by Constant Contact.
Use a block of XML provided by Constant Contact to post information to the server.
Modify the XML to include your campaign ID and the time you want the emails sent.
Resend the campaign to new clients as you update your mailing list.