There's a map for that. ;) (apologies to Steve Jobs and Wietse Venema for my lame humour)
Postfix is capable of address rewriting under MANY circumstances. This circumstance would call for the use of the
smtpd_sender_restrictions variable in main.cf.
Effectively, you will be putting a restriction in place to check sender addresses against an access table/db (the map!) you configure, wherein you will tell postfix to redirect to X address if the from address matches Y.
The line in main.cf might look like:
smtpd_sender_restrictions = check_sender_access hash:/etc/postfix/devToRewrite
And the contents of /etc/postfix/devToRewrite might look like:
email@example.com REDIRECT firstname.lastname@example.org
Please keep in mind that rewriting in postfix is very delicate, and you may have configs that could potentially conflict with these intended results.
That being said, some reading to get you started:
As usual, YMMV && HTH.