Sendmail problems

Hi,
I have some problems w/ the sendmail. I see that messages are queued in the /var/spool/mqueue and they are never sent to the recipients. This problem just suddenly started without any modifications in the current configuration. I already started and stop the sendmail and it did not help.
Also, I tryied to set #O QueueLA=22 and #O RefuseLA=20
in the sendmail.cf file, it also did not help.

Thank you.
Tanya

Were these to be delivered to the local server, or to be forwarded on to another server -- ie, a mail hub?

If the latter, it could be that there was a cron job that would periodically clean out the queue, and that job is no longer running. It also could have been a daemon at start-up time that did this. (sendmail -bd I think).