javax.mail.MessagingException: 501 Syntactically invalid HELO argument(s) >

Google Groups | Kamal Ahmed | 6 years ago
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    javax.mail.MessagingException: 501 Syntactically invalid HELO argument(s)

    Google Groups | 6 years ago | Kamal Ahmed
    javax.mail.MessagingException: 501 Syntactically invalid HELO argument(s) >
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    Javamail exception in maven project

    Stack Overflow | 2 years ago | user3026263
    javax.mail.MessagingException: 501 5.5.4 Invalid argument Done Testing Complete , Check Inbox Please
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    501 Command "HELO" requires an argument问题排查记录 - hbcui1984的专栏 - 博客频道 - CSDN.NET

    csdn.net | 11 months ago
    javax.mail.MessagingException: 501 Command "HELO" requires an argument
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    Google Groups | 7 years ago | aougruti
    javax.mail.MessagingException: 501 Syntactically invalid HELO argument (s)
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    Javamail and STARTTLS not working on different platforms

    Stack Overflow | 1 year ago | Beto Neto
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Root Cause Analysis

  1. javax.mail.MessagingException

    501 Syntactically invalid HELO argument(s) >

    at com.sun.mail.smtp.SMTPTransport.issueCommand()
  2. JavaMail API (compat)
    SMTPTransport.protocolConnect
    1. com.sun.mail.smtp.SMTPTransport.issueCommand(SMTPTransport.java:1363)
    2. com.sun.mail.smtp.SMTPTransport.helo(SMTPTransport.java:838)
    3. com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:375)
    3 frames
  3. JavaMail API
    Service.connect
    1. javax.mail.Service.connect(Service.java:275)
    1 frame