Because each address can only be associated with one Word account, it will not allow you to use the same email again. You can use a different email address that is not already in use, or you can log in to the account currently using your desired email address and change it to something else.Once changed, you can then reuse the email on a different account.↑ Table of Contents ↑ If you attempt to change your email address and find that it never updates after saving the changes, the issue is usually simple.
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If you are able to log in to your Couchsurfing account, you should be able to update your email address in your Account & Settings page.
If you are uncomfortable with that, you must log out of Word before leaving a comment.
Even then you will have to leave an email address but it will be your choice as to what you enter.
When you leave a comment on a blog at Word Press.com, and if you are logged in, your email address is made available to the owner of the blog when they see your comment.