thanks, Lazarus The 2nd; but part of the problem is that most of them have to be taught by me how to access their webmail and it's turned out to be easier for ME to access THEIR webmail to do what you suggest than to get them to do it themselves!
I'm now very familiar with the Spamguard settings!
I have to go into the webmail of one friend everyday to rescue all sorts of mail that has been sent to trash.
And it doesn't solve the problem of receiving an email from someone I've never heard from before and I can't reply to them. eg. if I advertise something on Freecycle, someone replies by email and if they have a bt address there is no way I can then contact them to complete the transaction.