Scheduling emails could be helpful if you want to send an email at a particular time so that your important message get noticed first and doesn’t get buried by all the other mails that the person will get after you send your mail.
The tool named RightInbox is free Chrome and Firefox extension specifically made for Gmail. After a quick installation you will find that a Send Now and Send Later button is added in your Gmail account. Send Later allows you to schedule the email in 1, 2, or 4 hours or select a specific date and time and time zone. Emails will be send based on your time zone but the option to send an email at a specific time does allow you to add an optional time zone which will prove handy if you’re corresponding with someone overseas. RightInbox is free throughout the beta and will always have a free starter package, so if all you need is simple email scheduling, this tool is for you