As a recipient, is it possible to detect if an email was sent via Gmail's “Schedule Send” vs. “Send”?

问题

Just curious if the email headers are marked by Gmail to denote if the email was scheduled vs sent right away.

来源：https://stackoverflow.com/questions/63714946/as-a-recipient-is-it-possible-to-detect-if-an-email-was-sent-via-gmails-sched