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The board base URL is a URL which is used as the URL base for unsubscription links in notification e-mails. You can set it in two ways:
In order for the unsubscription links to work correctly, we recommend that you follow these rules when creating user message boards and group message boards:
When creating a user message board, which is a message board placed on a user profile, set the Board base URL directly in the web part properties, for example like this:
~/Members/Profile.aspxYou can find a live example on the sample Community Site.
When creating a group message board, which is a message board placed on a group profile, set the Board base URL directly in the web part properties, for example like this:
~/Groups/Profile.aspxWhen creating a public message board, which is a message board placed on any page without a wildcard URL, the Board base URL property needn't be specified.