What does the word "null" appear in front of an addressee's email address?

When I address certain email addresses, the world "null" appears in front of the addressee's email address: why does this happen and what does it mean?

Mac Pro, macOS High Sierra (10.13), Mac Pro delivered 15Jan2012

Posted on May 7, 2018 10:18 AM

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What does the word "null" appear in front of an addressee's email address?

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