javax.mail.MessagingException: 501 Command "HELO" requires an argument

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    javax.mail.MessagingException: 501 Command "HELO" requires an argument
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    Root Cause Analysis

    1. javax.mail.MessagingException

      501 Command "HELO" requires an argument

      at javax.mail.Transport.send0()
    2. JavaMail API
      Transport.send
      1. javax.mail.Transport.send0(Transport.java:219)
      2. javax.mail.Transport.send(Transport.java:81)
      2 frames