Oracle Cloud Infrastructure Documentation

Troubleshooting Email Delivery

This topic provides troubleshooting solutions for problems you might encounter using Email Delivery.

TLS errors when integrating with Postfix

  • If you are encountering TLS errors when attempting to integrate Postfix with Email Delivery, ensure that the following setting is removed from the Postfix main.cf file, as it has been deprecated:
  • smtp_use_tls = yes

  • Use the following setting instead to turn on TLS:
  • smtp_tls_security_level = may

    Using this setting, the Postfix SMTP server announces STARTTLS support to remote SMTP clients, but does not require that clients use TLS encryption.

  • If you want to enforce the use of TLS, so that the Postfix SMTP server announces STARTTLS and accepts no mail without TLS encryption, use the following setting:
  • smtp_tls_security_level = encrypt

For more information, see Postfix TLS Support.