If an email cannot be sent nor a DSN returned to the sender, it is usually because both the recipient and sender addresses are invalid.These email messages from "postmaster" include a copy of the original email message for which the DSN was generated. Unlike the deferred mail queue, the dead mail folder contains copies of delivery status notification (DSN) email messages, also called non-delivery reports (NDR).ĭSN messages are sent from the FortiMail unit ( "postmaster") to an email’s sender when the email is considered to be more permanently undeliverable because all previous retry attempts of the deferred email message have failed. The Dead Mail tab displays the list of email messages in the dead mail folder.This also means that email staying in the deferred queue for less than five minutes does not appear on the Mail Queue tab. After the undelivered email remains in the deferred queue for five minutes, the mail appears under Monitor > Mail Queue > Mail Queue.If the sender cannot receive this notification, such as if the sender’s SMTP server is unreachable or if the sender address is invalid or empty, the FortiMail unit will save a copy of the email in the dead mail folder.Finally, if the FortiMail unit cannot send the email message by the end of the time limit for delivery retries, the FortiMail unit sends a final DSN to notify the sender about the delivery failure and deletes the email message from the deferred queue.But if delivery continues to be deferred, the FortiMail unit eventually sends an initial delivery status notification ( DSN) email message to notify the sender that delivery has not yet succeeded.If the email is subsequently sent successfully, the FortiMail unit simply removes the email from the queue.FortiMail units will periodically retry delivery (administrators can also manually initiate a retry). Delivery failure can be caused by temporary reasons such as interruptions to network connectivity. This allows the FortiMail unit to resend valid email quickly, instead of keep resending invalid email (for example, email destined to an invalid MTA
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