Delivery Temporarily Suspended Unknown Mail Transport Error Postfix Upd -

Following a system or Postfix update, your lookup tables (e.g., sasl_passwd ) might need to be re-indexed using the newaliases Virtualmin Community How to Troubleshoot Check the Real Error Logs

Delivery Temporarily Suspended - Unknown Mail Transport Error Following a system or Postfix update, your lookup tables (e

The content filter (like Amavis or SpamAssassin) might be down. 2. Verify Transport Settings The key word in this error is temporarily

If you share the exact log lines (queue ID and surrounding entries) and your master.cf transport for that delivery, I can give a targeted fix. The phrase "unknown mail transport error" is Postfix’s

The key word in this error is temporarily . Unlike a fatal bounce (which sends a failure report to the sender), a temporary suspension tells Postfix to queue the message and try again later. This is typically governed by the minimal_backoff_time and maximal_backoff_time parameters. The phrase "unknown mail transport error" is Postfix’s default fallback when a lower-level component (like the local delivery agent local , the virtual agent virtual , or a pipe to a content filter) returns an exit code or signal that does not map to a specific known error (e.g., "permission denied" or "disk full").

Ensure the server can resolve external domains: ping google.com . log to find the exact error code?