Need delivered and read confirmation
Please set up where we can choose to have confirmation that an email has been delivered and read.
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C. R. commented
not gonna happen folks.
https://help.yahoo.com/kb/new-mail-for-desktop/email-received-sln3386.html
Yahoo Mail does not provide a "read/return receipt" feature.To confirm that your recipient has received and/or read an important message, we suggest asking them to confirm receipt by sending you a reply.