process mail in /var/spool/clientmqueue in linux

How do I get sendmail to process mails in /var/spool/clientmqueue? sendmail -q does not work for this directory.

Solution 1:

To manually flush the queue in clientmqueue:

sendmail -Ac -q -v

Or without -v if you don't want to watch the progress in the console:

sendmail -Ac -q

Solution 2:

You will need to check what items are in that folder, if it is a qf/df pair, then it probably a failed mail transaction. So something wrong with your setting or mail not going out or to someone or even got rejected.

You also need to know that the normal sendmail -q will process the queue every one hour interval. You can do sendmail -q10m to make it process the queue every 10 minutes.

It will also be good to check the mail queue mailq -v -Ac, see if its empty or not. If its empty, then those mail in the clientmqueue, must have been the one that are not successful.