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Here is a sheet you might find to be helpful, Ross.
Anti-spam blacklists will list the originating IP address, not IPs associated with the domain used in the return addressing. The reasons are because A) 99.99% of the time, the return address of a spam email is forged/fake, and B) It is not considered a best practice to list an IP address that actually hasn't sent spam.
If you were to use a subdomain of your main domain (for example, firstname.lastname@example.org), that looks far less shady. Just remember, you are creating a new mail domain basically, so your IT team would need to create the appropriate A/MX DNS records, mailbox(es) or redirects in your main mail server, and SPF and DKIM (