NP, most of us are pretty punchy.
If you look at the date of the email (2009), spacing of the redaction and the sentence: "Rich's # didn't work," it appears they are talking about someone named Rich.
Seth Rich didn't graduate undergrad until 2011 and worked for the DNC in 2014. While he was politically active, I don't see him as a high-level staffer important enough to call directly. https://en.wikipedia.org/wiki/Murder_of_Seth_Rich#Seth_Rich's_early_life_and_career
Whether the email is new, I'm not sure. I'll have to peruse Wikileaks.