log in to [BT Mail] with your current details. Then go to Settings → Account Info → Change passcode. Follow the prompts to set a new passcode. If you can’t log in, use the "Forgotten passcode?" link to reset it.
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This is a very simple solution. You go to the btinternet email password page. They will need your current username and password. You can then enter your new password below that. The new password must be between 8 and 16 characters long. It also cannot contain any punctuation or spacing. You must also include at least one number.