I am moving my company email over to MS Online. Most of the process is already done except moving my MX records to MS Online. Right now my email comes into my exchange server and then forwards to MS Online. Once I change the MX records, I want to make sure that I can still use my current mail server for SMTP relay without the outgoing mail failing RDNS lookups. Does anyone know what DNS entries I need to make so that both mail servers can send out email, but I only want MS Online to receive mail.