Commits and tags may contain several email addresses. For commits, there is the author — the person who wrote the code — and the committer — the person who added the commit to the tree. When signing a commit with Git, whether it be during a merge, cherry-pick, or normal
git commit, the committer email address will be yours, even if the author email address isn't. Tags are more simple: The tagger email address is always the user who created the tag.
If you need to change your committer or tagger email address, see "Setting your commit email address."