Delivery Temporarily Suspended Unknown Mail Transport Error Postfix Upd [upd] -

“The real error will be someway further back up the /var/log/mail.log. Postfix will try a few deliveries and then this error means it knows further attempts will fail so doesn't bother.” Server Fault · 16 years ago

: Use mailq or postqueue -p to see the status of stuck messages. If you’ve fixed the error, you can try to force delivery with postqueue -f . “The real error will be someway further back