[Exim] How can exim4 get a 554 error but telnet 25 works?

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MHancock, Scott
MPhilip Hazel
M+\Hancock, Scott
||MMatthew Byng-Maddick
|MEdgar Lovecraft
MPhilip Hazel
MHancock, Scott
MMatthew Byng-Maddick
MPhilip Hazel
MHancock, Scott
MPhilip Hazel