In cPanel, “deferred” and “failure” messages represent different stages or reasons why an email could not be delivered. Here’s the distinction between the two:
- Deferred Message:
- A deferred message occurs when an email cannot be delivered immediately, but the system will try again later.
- This is usually a temporary issue, such as:
- The recipient’s mail server is temporarily unavailable.
- Network congestion or connectivity issues.
- The recipient’s mailbox is full.
- The email stays in the mail queue, and cPanel will attempt to resend it for a certain period (usually 72 hours) before it gives up.
- Failure Message:
- A failure message (also known as a bounce or non-delivery report) indicates that the email could not be delivered and will not be retried.
- This is a permanent failure, and some common causes include:
- The recipient’s email address does not exist (invalid address).
- The recipient’s mail server rejected the message for policy reasons (such as blacklisting or spam filtering).
- A configuration issue on the sender’s mail server.
In summary, a deferred message indicates a temporary problem with potential for future delivery, while a failure message indicates a permanent delivery failure.
It seems like you’re looking for a further explanation. Here’s a recap of the main points:
- Deferred Message:
- Temporary delay in delivery.
- cPanel will keep trying to send the email for a set period (like 72 hours).
- Common reasons: recipient’s mail server is down, or the recipient’s inbox is full.
- Failure Message:
- Permanent delivery failure.
- The system will not attempt to resend the email.
- Common reasons: incorrect email address, or the recipient’s mail server rejects the message.