Knowing when the message has been read mailing sent in Gmail

From which they can see times read messages sent. 

Some e-mail management software users access to reports and delivery through which the sender can know when the message is read by the recipient. But this feature Ataatovr default mail in Gmail. 

So users can take advantage of Gmail Add MailTrack free for Google Chrome, and by which they can see times read messages sent. 

User needs to install only added and then log in using the Gmail account and allow access to add the required powers. Then note the presence of icons before the name of the addressee contain signals to indicate the message is read or arrival.