I emailed a professor about a postdoc position three weeks ago. He replied me on Friday that week and showed his interest. I answered his question about partial funding in the new email but have not heard from him since then. It's been two weeks and I think it's time to send a followup email. I'm not sure how to write the subject line. Should I forward the previous email and write subject like this: Follow-up about postdoc position? Thanks a lot. I'm a little nervous about the position and hope I can get it.