Be polite but direct: Thank them for their time in the interview. Explain that you're following up on your interview. Remember to be specific about the job, mentioning the job title and interview date. Restate your interest in the position and say you're keen to hear about the next steps.
Email Subject: Thank you + follow up on [Position] interview. Hi [Name], Thank you so much for taking the time to talk to me about the [position] at [Company Name] today. I really enjoyed learning about [current project or initiative] and how [something specific you talked about in the interview].
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email title for follow up interview