javax.mail.MessagingException: Unknown SMTP host: smtp.gmail.com ; nested exception is: java.net.UnknownHostException: smtp.gmail.com

java-samples.com | 2 months ago
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    java-samples.com | 2 months ago
    javax.mail.MessagingException: Unknown SMTP host: smtp.gmail.com ; nested exception is: java.net.UnknownHostException: smtp.gmail.com
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    Stack Overflow | 3 years ago
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    coderanch.com | 1 year ago
    javax.mail.MessagingException: Could not connect to SMTP host: 10.40.9.50, port: 25, response: 421

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    Root Cause Analysis

    1. javax.mail.MessagingException

      Unknown SMTP host: smtp.gmail.com ; nested exception is: java.net.UnknownHostException: smtp.gmail.com

      at javax.mail.Transport.send0()
    2. JavaMail API
      Transport.send
      1. javax.mail.Transport.send0(Transport.java:218)
      2. javax.mail.Transport.send(Transport.java:80)
      2 frames
    3. Unknown
      SimpleSendEmail.main
      1. SimpleSendEmail.main(SimpleSendEmail.java:45)
      1 frame