Guys
Thanks for your comments.
I'm resurrecting this thread rather than start a new one as it's related.
I had problems with Zimbra receiving email sent to me via my old company address (call it abc.co.uk which is still valid). Madasafish (who are hosting the company website & related email addys) suggested that Zimbra was not working. So, as an experiment, I downloaded Thunderbird, which I could receive the email on, but which regularly emptied the inbox...
Now I've set up email on my eldest's PC, using Evolution Mail (I've installed Ubuntu 10.10 on his PC). He can send me email to simon@ abc.co.uk, he can send himself email (to william@ abc.co.uk), but when I send email to him, it ends up not in his inbox, but mine...
Now I've spoken to Madasafish and they can't see why.
Can you?