com.sun.mail.smtp.SMTPSendFailedException: 530 5.7.0 Must issue a STARTTLS command first. b23sm8262698ugd.64

igniterealtime.org | 3 months ago
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    Issues with email setting in Admin console .. | Ignite Realtime

    igniterealtime.org | 3 months ago
    com.sun.mail.smtp.SMTPSendFailedException: 530 5.7.0 Must issue a STARTTLS command first. b23sm8262698ugd.64
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    gmail via oauth SMTPSendFailedException(Authentication Required)

    Stack Overflow | 3 years ago | user2774477
    com.sun.mail.smtp.SMTPSendFailedException: 530-5.5.1 Authentication Required. Learn more at 530 5.5.1 http://support.google.com/mail/bin/answer.py?answer=14257 in2sm6968052pbc.37 - gsmtp
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    Java Mail Error In Sending Mails

    Stack Overflow | 4 years ago | Jesse Siu
    com.sun.mail.smtp.SMTPSendFailedException: 530 5.7.0 Must issue a STARTTLS command first. st6sm11092256pbc.58
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    SMTPSendFailedException: Error Sending Mail using 1and1 mail service

    Stack Overflow | 3 years ago | Chandra Prakash
    com.sun.mail.smtp.SMTPSendFailedException: 421 invalid sender domain 'Office' (misconfigured dns?) http://postmaster.1and1.com/error-messages/#invalidsenderdomain
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    New service request notifcation email not being sent to Exchange 2007 Server.

    sysaid.com | 1 year ago
    com.sun.mail.smtp.SMTPSendFailedException: 550 5.7.1 Client does not have permissions to send as this sender

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Root Cause Analysis

  1. com.sun.mail.smtp.SMTPSendFailedException

    530 5.7.0 Must issue a STARTTLS command first. b23sm8262698ugd.64

    at com.sun.mail.smtp.SMTPTransport.issueSendCommand()
  2. JavaMail API (compat)
    SMTPTransport.sendMessage
    1. com.sun.mail.smtp.SMTPTransport.issueSendCommand(SMTPTransport.java:1515)
    2. com.sun.mail.smtp.SMTPTransport.mailFrom(SMTPTransport.java:1054)
    3. com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:634)
    3 frames