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.