Getting error during send mail via apex application. ORA-29279:
SMTP permanent error: 501 malformed auth input (#5.5.4
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Check your apex_mail configuration if it is not using the TLS.
To check the configuration, sign-in to Oracle Apex administration services then go to Manage Instance > Instance settings. Under the email section, you will find use TLS/SSL option. Specify Yes for the value.
Now it will issue the STARTTLS command after opening the connection, and the above error should not occur.
When using the UTL_SMTP mail package for sending emails, the error ORA-29279 got resolved by issuing the following command: