[exim] Received and read time report

Hi All,

How can I know the time when an email was read by the recipient?

EXIM receives an email and validates the receipt, the time of this receipt
is recorded at EXIM_MAINLOG file. Where is the time to read by the
recipient?

How can I generate a report in have: sender, recipient, time of receipt and
reading time?

Thanks,

Ronaldo Luiz
ronaldo@???


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