E-mail history logs says, Connection successful" but messages are not sent, get the following error,
Encountered error while attempting to send email: com.sun.mail.smtp.SMTPSendFailedException: 530 5.7.57 Client not authenticated to send mail.
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Outgoing messages were working fine before the implementation of the following (was required because of Microsoft depreciating basic authentication),
Configure an incoming e-mail account for Office 365