You’ll need to be usingiOS 16or higher on your iPhone.
Address and write the emailas you normally would.
Tap and hold thesend button.

Release when the menu appears.
To pick the suggested send time, tap it.
To choose a different time, tapSend Later…

Pick the date to send the email by tapping the calendar date.
Pick the time by tapping the time and moving the scroll wheels.
When you have the date and time you want, tapDone.

The email is now scheduled to be sent at that time and you go back to your inbox.
TapSend Laterto see a list of all scheduled emails.
Tap the email whose sending schedule you want to edit.

If you’d rather delete the email, swipe right to left on it and tapTrash.
In the schedule area, tapEdit.
Pick a new day and time and tapDone.
To cancel the scheduled send or to edit the text of the email, tapCancel Send Later.
Some third-party email apps for iPhonesuch as Gmail andSpark, among othersalso support scheduling emails.
The exact steps in those apps are different, but the basic concepts are the same.
Next, choose the date and time you want to schedule the email for.
Note that Gmail will let you schedule a maximum of 100 emails at one time.
Set the date and time you want the email to send, thenCloseand selectSend.
SelectOKto save options, enter a recipient, then selectCreate Recurring Email.