sending, but recieving only some messages

I sent a message yesterday to get started.
I downloaded this morning and my message wasn't there in my inbox, so I went to the list online. instead of the 7 my computer recieved since Kathleens CATCHING UP there are about 14 messages (that window has closed now so I cant re-count to be sure)and the one I sent is one of those I didn't recieve.
I have limited online time, and I dont want to have to read online to be sure I read everything (grin)

Is yahoo having a problem, or might there be something I could do differently?

Thanks
Kath