My Name </O=FIRST ORGANIZATION/OU=EXCHANGE ADMINISTRATIVE GROUP(ABCDEFGHI23JKLMN)/CN=RECIPIENTS/CN=012345678901234X>
On my Win10 computer in Firefox when I type the 1st letter of my 1st name into the "to" address in Hotmail.com (msn.com email address), up pops the above as 1 of the possibilities to pick. (I've changed the characters in what appears to be codes of some kind at the beginning & end of the 2nd line, because I have no idea what they may mean or reveal.)
I also have some other "strange" contacts; some completely unknown; some very similar to known contacts. This one caught my eye because it has my name.
Where do these entries come from? How can I keep them out?