A new schedule property has been added to our /email/send and /email/mime API endpoints. You can now schedule emails to be sent up to 3 days in advance.

When you use the schedule property, the endpoint will return a schedule_id instead of an email_id. This ID can be used to track the delivery of your email via webhooks. The email will also receive a X-Smtp2go-Schedule-Id header, which you can use with webhooks to monitor delivery.

Additionally, we've added two new endpoints:

• /email/scheduled/search - Retrieve a list of up to 1,000 scheduled emails matching the supplied parameters.
• /email/scheduled/remove - Remove an email scheduled for sending by schedule_id).