[exim] Is there and logical reason to reject mail from: <> ?

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M++\Marc Perkel
|||MDavid S. Madole
||MStephen Gran
|MGiuliano Gavazzi
|M+\David Brodbeck
|||MDavid
|||MMarc Perkel
|||MDavid Brodbeck
|||MDavid
|M||Exim User's Mailing List
|||MMatthew Byng-Maddick
|||M\David Brodbeck
|||||MDavid Brodbeck
||M|||Tony Finch
||.|M|David
||.||MDavid
|M\||Tor Slettnes
||||MMarc Perkel
||||MTor Slettnes
||M|Marc Perkel
||.|MDavid Brodbeck
||.MExim User's Mailing List
M|.|John W. Baxter
.M.|Exim User's Mailing List
.M.|Tor Slettnes
.|.|M\David Brodbeck
.|.||MMarc Perkel
.|.|MAlan J. Flavell
.|.||MDavid Brodbeck
.M.||Exim User's Mailing List
.M.||Tor Slettnes
.|.||M\jori.hamalainen
.|.|||MTor Slettnes
.M.|||Exim User's Mailing List
.|.||MExim User's Mailing List
.|.||MJan-Peter Koopmann
.M.|||Ian Eiloart
.|.|||MDavid Brodbeck
.|.||M|Exim User's Mailing List
.M.||.|Exim User's Mailing List
.|.||.MExim User's Mailing List
.|.||MJan-Peter Koopmann
.|.|||MJan-Peter Koopmann
.M.|||Ian Eiloart
...||MIan Eiloart
...||MJan-Peter Koopmann
...||MIan Eiloart
...||MJan-Peter Koopmann
...||MIan Eiloart
...||MJan-Peter Koopmann
...|MKjetil Torgrim Homme
...M|Kjetil Torgrim Homme
....M\Alan J. Flavell
....|MMatt
....|MJan-Peter Koopmann
....|MTor Slettnes
....M|Kjetil Torgrim Homme
.....MKjetil Torgrim Homme