Internal DNS records necessary for Office 365 (non-hybrid)?

I have migrated my company's on-prem Exchange environment to Office 365. Email is working well and I have decommissioned the on-prem Exchange server. DNS is hosted externally through GoDaddy and of course is working as expected.
I'm considering cleaning up the old internal DNS entries now. Is it safe to remove the DNS records on my internal DNS servers for Office 365 (including autodiscover)? We basically created the same records internally to match what is on the external DNS hosting during the initial migration, but I'm thinking these are not necessary since my environment is Office 365 only (not hybrid) and has no dependencies on the internal domain.
Jerry DIT ManagerAsked:
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Mal OsborneAlpha GeekCommented:
Depends. If your local DNS server is authoritative for your registered domain, or your internal LAN has the same DNS domain, you need to keep those records, otherwise no.

ie, if your internal domain is WORKPLACE.COM and email is sent to USER@WORKPLACE.COM, then the DNS entries are required. If you domain  is OTHERNAME.COM or WORKPLACE.LAN or something, the records should be deleted.

Usually, the latter case will apply.

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Jerry DIT ManagerAuthor Commented:
Thanks for the response. That's very helpful. Internal LAN has same DNS domain (local domain is WORKPLACE.COM and email is sent to USER@WORKPLACE.COM). I'll keep the internal DNS records in place then. Thanks again!
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