Configuring a Custom Return Path

As described above, a Custom Return Path is required for full compatibility with DMARC. Mailboxes verifying DMARC may reject emails where the sender domain doesn't have a Custom Return Path configured. Detailed instructions for configuring a Custom Return Path are found in the online help in the Configuring a Custom Return Path topic.

Oracle provides the Custom Return Path for DMARC compatibility. Currently, Oracle doesn't support the use of the Custom Return Path to receive bounce-back messages when emails are rejected by mailboxes. Such a configuration would require:

• all recipient mailboxes be configured to bounce back undeliverable mail to sending mail server. Not all mailboxes support this and customers typically do not have access to the mailbox configuration for arbitrary recipients.
• mailbox support for VERP mailboxes. Bounce back messages are sent to specific mailboxes encapsulating the sender and recipient mail domains. Not all mailboxes support VERP configuration.
• recipient suppression to avoid reputation loss. Repeatedly sending email to an invalid address can lead to a loss of internet reputation both to the sending domain and Oracle Mail. Oracle requires the bounce back emails to ensure a suppression of invalid recipient addresses and avoid the loss of reputation.