Moving to O365 EOP from on-Premises email gateway

I have mcafee as email gateway and have hybrid infrastructure for exchange. Right now first email comes to gateway and then it goes to O365.
Now I am planning to decommission the gateway and use O365 EOP instead.
Can anyone please give me best way to do that? I guess I need to change mx record but I have one big problem because large blacklisted, whitelisted and other rules in gateway and how that rule can be migrated to Exchange Online Protection In O365?

Thank you.
raj kumarAsked:
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timgreen7077Exchange EngineerCommented:
just change the MX record to point to EOP and that will resolve the mail route. in regards to the whitelist and blacklist on the McAfee gateway, if you can export the email addresses or domains to a csv file, they can be imported into EOP.

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raj kumarAuthor Commented:
Thank you Timgreen7077 for replying.
Can you please share the steps of exporting and importing of email addresses and domains, please?

Thank you very much..
timgreen7077Exchange EngineerCommented:
You can see the below link for an example how to do it:

Also you can do the following:

log in to O365 > security & compliance > threat management > policy > anti-spam > allow lists > Edit allow sender and paste the coma delimited emails or domains into the text field.
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raj kumarAuthor Commented:
Thank you very much.
As I have to apply this next month, I have last question,
Do you think that EOP alone can handle the organizational need without any third party gateway?

timgreen7077Exchange EngineerCommented:
Yes it can. No worries.
raj kumarAuthor Commented:
Thank you very much timgreen7077.
I appreciate your valuable comments..
timgreen7077Exchange EngineerCommented:
sure thing
Only 2 sent from mine
How many users you have total including clod and onpremise?
Do you have enough EOP licenses to cover both since u r moving mx to o365, enough EOP licenses should be available
Cross check that and if required you need more licenses to be in compliance
raj kumarAuthor Commented:
We are planning to move our mailboxes to O365.
Do we need license for EOP? I think EOP does not require license, but I am not sure right now. I have to see more documentation..
Nope, EOP licenses are required
what plan you have for exchange online (Normally E3 / E5 etc), normally EOP licenses ships with that plan with equal amount of licenses Because EOP is different service altogether which secure your mail flow with Exchange Online Protection Gateway
When you purchase enterprise plans from MS they take responsibility of your online mailboxes, but what you are trying to do, you are diverting mail flow entirely to cloud while keeping hybrid environment, so technically when you relay mails to on premise server, its not covered by EOP but utilize EOP services and hence you have to have EOP licenses equal to total organization users (on premise + cloud)
So either you keep MX to onpremsie or get additional EOP licenses
Check with your MS TAM or whoever from you purchase MS licensing about EOP licensing requirements
raj kumarAuthor Commented:
Thank You Mahesh for your valuable information, I will definitely contact MS for licensing information.
Although we will maintain hybrid scenario, our all mailboxes will be in exchange online with P1, P2 and E4 licenses.
I was thinking that, MS provides EOP with the license in exchange online, so why to pay third party!!!

Thank You.
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