[Exim] MX without A allowed by which RFC's?

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M--\John Dalbec
M\.|Kirill Miazine
|M\|Dominik Ruf
||M|Andreas J Mueller
|M.|Adam D. Barratt
|..MTony Finch
|..MWillie Viljoen
|..MPhilip Hazel
MJohn Dalbec
MPhilip Hazel