Questions regarding Office 365

Good Afternoon All,

I am in the process of setting up Office 365 with Exchange Online and have made some progress.   I have a few concerns\questions about migrating from Exchange 2013 to the Exchange Online.  

We are looking at a Hybrid approach where half of our Mailboxes will reside on the onPrem Exchange Server, and our Remote Users will reside on Cloud.

When I move the DNS records,  all email will flow thru the Exchange Online portion of Office 365.   I only have licensing for 50 users for O365 and have licenses for the remainder onprem (another 50 users).   Will not having O365 licenses for my ON Premises users affect their ability to receive email?  i.e.  even if they don't have a license, will O365 still pass the email onto the on premises server?
LVL 8
Jeff RodgersNetworks & Communications Systems ManagerAsked:
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Vasil Michev (MVP)Commented:
O365 will simply relay the mail, you dont need licenses for that.

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Jeff RodgersNetworks & Communications Systems ManagerAuthor Commented:
Any indication for the SPF record?   When I include the IP address in the SPF record, I should include the Publicly routable IP address of the onPrem mail server as well?

i.e.  Microsoft recommends this

v=spf1 include:spf.protection.outlook.com -all

but should I add the public IP so it reads like this?  Or do I use the internal IP address?

v=spf1 ip4:xxx.xxx.xxx.xxx include:spf.protection.outlook.com -all
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