May 14.2018 - Version: 1.0.0
Mail Receipt is a macOS application that adds delivery notification and read receipt requests to your e-mails.
Many e-mail servers will honour the Return-Receipt-To request and inform you that your e-mail has been placed into the mailbox of the recipient. This tells you that your e-mail reached the intended mail account but it does not tell you any more. Alone this automatic reply does not let you know if your e-mail has been read or seen.
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Screenshots Mail Receipt for Mac