It might be that Google uses different servers for scheduled and non-scheduled messages. PS: The headers include which Gmail server sent the message.
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If you set X to to your best estimate of how many emails are scheduled, for example 1 / 1000, you get the probability that an email was indeed scheduled if the seconds are zero as P = X / (X + 1/60 * (1 - X)). P(scheduled | zero) = P(zero | scheduled) * P(scheduled) / (P(zero | scheduled) * P(scheduled) + P(zero | non-scheduled) * P(non-scheduled)) It's a classic application of Bayes' theorem: To calculate the probability that the email was scheduled when the seconds are zero, we lack the base rate of how many emails are scheduled. In my experiment: Date: Sat, 10:17:41 +0100 <- non-scheduled Since you can schedule emails only with the precision of minutes but not seconds, you know for sure that the email wasn't scheduled if the time when the email was sent includes seconds. This is great for reminders, or if you really. Step 4: Click on the calendar icon in the compose box. Step 3: Compose an email that you want to schedule for delayed delivery. There are some predefined options like Tomorrow morning, Tomorrow afternoon & Monday morning. You can choose the date and time as you want. Click on the little arrow button beside the Send option to open the Schedule send. Step 2: After successful installation, Refresh your Gmail page. Simply compose an email and you will get an option to schedule the email to send at a later date.
GMAIL SCHEDULE EMAIL TO SEND OUT INSTALL
Step 1: Install SalesHandy’s Chrome Plugin From here. When you schedule an email, though, Gmail sets the Date header to the scheduled time. After much anticipation, Gmail has released the ability to schedule an email to be sent at a later day and time. Here is a step by step guide on Gmail Delay Send. When I tested this myself, I couldn't find any additional headers or any additional parameters in the headers.