[exim] syntactically invalid argument(s) - rejected HELO

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Author: Marc Perkel
Date:  
To: Exim users list
Subject: [exim] syntactically invalid argument(s) - rejected HELO
I have a customer who is getting real email from korea (yes - there is
email that isn't spam) . But - getting this in the logs.

syntactically invalid argument(s)

What does this mean?