Scheduled Emails
Marketing. Configuring a system to send email messages starting at a given date and time.
For example: If a retailer has a promotion starting at 10:00. They should want the email delivered as close to that time as possible.
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Consider scheduling sending at off-peak times
If you have the flexibility, schedule email for off-peak times. Most senders schedule email batches for the top of the hour or half hour. Scheduling email to avoid those times (for example, scheduling at 10:53) can result in lower deferral rates because it won't be going through our servers at the same times as everyone else's mail.
Twilio SendGrid allows you to set when email gets sent in its Marketing Campaigns or transactional APIs.