javax.mail.SendFailedException: Sending failed; nested exception is: class javax.mail.MessagingException: 530 5.7.0 Must issue a STARTTLS command first. jm5sm18410921pbc.1

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javax.mail.SendFailedException: Sending failed; nested exception is: class javax.mail.MessagingException: 530 5.7.0 Must issue a STARTTLS command first. jm5sm18410921pbc.1
at javax.mail.Transport.send0(Transport.java:218)
at javax.mail.Transport.send(Transport.java:80)
at in.xyz.SimpleSendEmail.main(SimpleSendEmail.java:47)

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