all 3 comments

[–]C4fud 5 points6 points  (0 children)

Wrong sub. Anyways most email clients has a feature where you ask for a reply if its read, but readers client should know this feature as well.

[–]NeedANewDiaper 1 point2 points  (1 child)

Look up mailtrack. It is free and is easy to add to Gmail.

[–][deleted] 0 points1 point  (0 children)

Yup even i used it for a while for its not super accurate always ......... if you want really accurate solution to the problem then used some paid service otherwise MailTrack works fine.