[Exim] How unique are exim queue msg IDs?

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M---\The Flying Hamster
|...MPhil Pennock
|...MDave C.
M++\|Jeffrey Goldberg
|||M|Dave C.
||M.|The Flying Hamster
|M..|Philip Hazel
|...MPhilip Hazel
MNigel Metheringham
MChris Thompson
MPhilip Hazel
|Mmichael
MChris Thompson
MPhilip Hazel
MDave C.
MPhilip Hazel