Adding additional IPs to OnPrem exchange server for just receive connectors

Hey all. Kind of in the middle of a very long exchange migration to o365. We are trying to decom an absolutely ancient 2008 box that only operates as a internal smtp relay for other servers/printers/ect.

I have a clear path forward of replicating the receive connectors on a new exchange server and then adding the old IPs to the new server. My question lies in what the best practice is when using a server with multiple IP addresses on exchange.

Does adding additional IPs to the server disrupt mail sending in any way? We have a bunch of fire wall rules and such to restrict the mail flow to be from specific IPs when leaving the org. I just want to make sure I wont break any sending of email via the IPs in place by adding more IPs for this server to receive mail on a specific connector.