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@robboscokewrote:

In My eBay click accounts, left hand side, 4 down click, Site Preferences.
Half way down the page, Block Buyers who, right hand side click edit.
Bottom of page, click Blocked list.

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It will stop them from making further bids, but if they have already contacted you it wont prevent further contact for a couple of weeks. there is also a check box to prevent blocked bidders in general from contacting you, but again it does not work immediatly if they have already sent you a message.