Boomerang plugin offers you the option of sending to your posts at a future time.
To use this plugin, www.boomeranggmail.com by entering the address, a red “install Boomerang” button by pressing this plugin you can save your Gmail. After this process, you Write your mails to be sent at a future time and now you will be able to set. To do this, write your email like you always do and “send later” button you can save the time of sending. In addition, boomerang is a plugin which helps you archive your mail also. Also you can set it to notify you when a response comes in to the message you sent, and in this way, the incoming e-mails disappear and overlook important messages can be prevented.