[Exim] Panic log error message I can't understand

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ThreadAuthorDate ()
MJonathan Haynes
M--\Jeffrey Goldberg
M..|Philip Hazel
|..MJonathan Haynes
M+\|Jonathan Haynes
|||MJeffrey Goldberg
||MJeffrey Goldberg
||MPhilip Hazel
|MPhilip Hazel
MVadim Vygonets