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Akismet plugin should ignore Admin
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Welcome to the community!
What version number of Vanilla do you use?
If you're using Vanilla 2.1b2, there's an link when viewing a user's profile in their info box called "not verified" that you can click to verify the user and make Vanilla ignore the user for spam checks.
There's also a plugin called Bulk Edit that will let you verify many users at once if you're using Vanilla 2.1b2+.
Add Pages to Vanilla with the Basic Pages app