If they are sitting in front of it while the message comes in, and they are reading it as you try to recall it - Yes they will get a message saying it is trying to be recalled.

If they haven't looked at it all, then no - It just disappears and they are none the wiser. If you are an Admin, you can just connect into their mailbox and rip the message out, if it's only one or two people.

Keep in mind however, if your systems are in Sydney, there are privacy laws which make doing that illegal.

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Should have bought an STI