Confirmation when a message has been opened
Two organisations that I belong to and that send out newsletters by email
have recently reported statistics of how many members open these messages.
This presumably depends on either the member's mail client or the webmail
system (whichever the member uses) sending some sort of acknowledgment
back to the sender when a message is opened.
Am I right in assuming that MPro does not do this? Is that unusual or are
the statistics likely to be missing members who use other mail clients?
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