Can you send an email from more than one email? For example, from firstname.lastname@example.org AND email@example.com? We are trying to send them from sales rep but Marketing also wants visibility into the reply to's.
no, you cannot.
If you want Replies, use Siftrock or a similar tool.
+1 Siftrock as the go-to reply manager for Marketo.
Great news! Now available.
Email CC - Marketo Docs - Product Documentation
From/Reply To is the question here, though. Inbound, not outbound.