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I keep telling our customers to change their personal email addresses for this reason. I actually say to them that there is no guarantee this email address will continue to work, Tesco/TalkTalk/BT/Whoever are under no obligation whatsoever to keep it working. The number of 'tinyworld.co.uk' and suchlike email addresses I see out there is decreasing, but there are still a lot of people who insist on keeping them.