Outgoing email problem

Has anyone else noticed a problem with outgoing email? If I, for example, log in as any of my users and attempt to send an external message through pine, the message is not delivered (and has not been about 4 hours after I sent it). This was working fine earlier today.

we had a problem with sendmail on some of the web machines today - messages were being queued but not sent for some reason.

so if you were using PINE directly on the machine, this was most likely the cause of the problem. the messages should have been delivered by now, and delivery should be working properly again.