As another commenter said, if the email contains anything like a request I use "Thanks" and I mean it. Perhaps some of this depends on the culture in your organ

As another commenter said, if the email contains anything like a request I use "Thanks" and I mean it. Perhaps some of this depends on the culture in your organization. In mine some people I've worked with for ten years spell my—very simple—name incorrectly and then write "Regards" so I have never taken that seriously.