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?

Richard

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