If I've read this correctly is the problem caused by the fact that you are being too precise with your email address when setting up Mailwasher? Using your own example can you not use wildcard characters in the address something like *@smith1970.freeserve.co.uk ? Mark you, I've never used Mailwasher so that advice may be rubbish.
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Do you know that we're all in line for succession to the throne? Really?
Well, if forty-eight million, two hundred thousand, seven hundred and one people died I'd be Queen.