The extension for Newsletter – Bounce runs at hourly intervals, processing up to 1000 messages per check (this limit might vary). In the configuration panel, you can see the last time the extension checked the mailbox and when the next run is scheduled.

However, note that if your website is performing resource-intensive tasks (like sending newsletters to a large audience), the bounce checks could be delayed or occasionally skipped.

Bounces can be categorized as either "permanent" or "transient." Permanent errors imply that the email address is unreachable (e.g., it doesn't exist), while transient errors are temporary issues like a full mailbox. Typically, only permanent errors are processed, marking the email as bounced, while transient errors are ignored. However, you can configure the addon to handle bounced addresses, even those with transient errors.

Permanent errors have a code format of 5.X.X, while transient errors have a format of 4.X.X. While these error codes should assist in classification using the last two numbers (X.X), many email servers don't set them correctly, so the addon doesn't process the sub-error codes.

To test the configuration and errors, perform a test connection to the POP3 server. A successful test will display a success message with debug info at the top of the page. This test extracts 10 messages but doesn't process or delete them.

If no error messages are captured and you're expecting some, ensure that the return path in the Newsletter plugin's main settings matches the dedicated mailbox address.

If you encounter an error message, it could be due to incorrect parameters, such as the hostname, password, port, or protocol. Double-check these settings with your provider. For specific errors like "getaddrinfo failed" or "POP 3 connect: Error [0] []", there are troubleshooting steps detailed for resolution.

Managing bounces is crucial to avoid spammy behavior and potential blacklisting. Detecting and handling bounce notifications helps prevent sending messages repeatedly to invalid addresses, safeguarding your domain's reputation.