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,
ross@marketing.company.com), 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 (
http://community.marketo.com/MarketoArticle?id=kA050000000KyrD).