As a user who can apply tags, you can apply a classification tag to emails by hand, in addition to the emails it tags automatically, and remove it again.

Apply a classification tag

1. Go to the Search section and run a search.
2. Click an email to open it on the right.
3. Click Apply Tag above the email. On a smaller screen, it's under More.
4. Click the Tag Name field. The tags you can apply are listed under Personal, Legal Hold and Classification.

5. Type the start of the tag's name and select the classification tag.
6. Click Tag Item.

You'll see a confirmation message: Tag successfully applied. The tag appears under the email's subject.

To tag several emails at once, select them in the results list and click Apply Tag in the toolbar above the results. Then click Tag {n} Items, or Tag Entire Page, or or Tag All Results (up to 5,000 emails).

Please note that only the classification tags you're allowed to apply are listed, and classification tags can't be created from this window. The Create option here makes Personal or Legal Hold tags. To create a classification tag, see How to Manage Classification Tags.

Remove a classification tag

1. Open the email.
2. Under the subject, click the X on the classification tag.

The tag is removed right away, without a confirmation. You'll see a confirmation message: Tag successfully removed.

To remove a tag from several emails, select them and click Remove Tag in the toolbar above the results.

Please note that you can remove a classification tag if you have the Manage classification tags permission, if the tag can be applied by everyone, or if you're an Account Admin.