Thank you for the prompt replies!
1. I can only look at the 'sent' in the computer that actually sent, which does me no good at all. I want the document on the other computer.
2. Using the cloud, while seemingly sensible in most cases, would be an unnecessary complication for Marilyn when I can simply send her an email. We use the same email address.
3. Sympatico servers were not down. I could send out and receive emails throughout the day.
4. A workaround I ended up using was to send the recipe (in this case) to my Gmail account, and from that send it to my Sympatico email address and it went to all three OS's. Then I could print it.
5. E.M.Forster wrote a short s/f story in 1909 called the Machine Stops. The human world was simplified by the fact that machines, in a huge interconnected creation, did all the work. And then one day the machine stopped and no one could fix it. Prescient.
6. About 10:00 p.m. last night the problem cleared on its own. Still working today. I find it interesting that the emails I sent to myself from all 3 computers have never been seen again, except in the sent boxes of my computers.
Thanks again for the help.