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While crap does not yet support changing the username of the CVS commits, this can be done afterwards using the following command:

git filter-branch --env-filter 'WRONG_EMAIL="oldusername"
NEW_NAME="Frank Smith"
NEW_EMAIL="newemail@abc.123"

if [ "$GIT_COMMITTER_EMAIL" = "$WRONG_EMAIL" ]
then
    export GIT_COMMITTER_NAME="$NEW_NAME"
  export GIT_COMMITTER_EMAIL="$NEW_EMAIL"
fi
if [ "$GIT_AUTHOR_EMAIL" = "$WRONG_EMAIL" ]
then
    export GIT_AUTHOR_NAME="$NEW_NAME"
    export GIT_AUTHOR_EMAIL="$NEW_EMAIL"
fi
' --tag-name-filter cat -- --branches --tags

Original source: https://www.git-tower.com/learn/git/faq/change-author-name-email