I am a PhD student, and I was the corresponding author on a paper published during my postbac [and my supervisor was a coauthor]. No one will think of it as improper or unethical. You are university affiliates, so there should be no problems there. And as long as the work is high quality and is reasonable (has your supervisor/other expert/faculty read over the paper?), I can't imagine a reviewer caring. If you're worried you can submit to a journal with double blind review.

On the contrary, I can only imagine being a corresponding author on a quality paper so early in your career being a positive outcome, as it exemplifies your independence.

I am a PhD student, and I was the corresponding author on a paper published during my postbac [and my supervisor was a coauthor]. No one will think of it as improper or unethical. You are university affiliated, so there should be no problems there. And as long as the work is high quality and is reasonable (has your supervisor/other expert/faculty read over the paper?), I can't imagine a reviewer caring. If you're worried you can submit to a journal with double blind review.

On the contrary, I can only imagine being a corresponding author on a quality paper so early in your career being a positive outcome, as it exemplifies your independence.