Reference Entries of Office 365 records for Internal & External DNS

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CNAME: autodiscover autodiscover.outlook.com 5 minutes (300 seconds)
CNAME: sip sipdir.online.lync.com 5 minutes
CNAME: lyncdiscover webdir.online.lync.com 5 minutes
CNAME: enterpriseregistration enterpriseregistration.windows.net 5 minutes
CNAME: enterpriseenrollment enterpriseenrollment-s.manage.microsoft.com 5 minutes
TXT: @ v=spf1 include:spf.protection.outlook.com -all 5 minutes
SRV: _sip._tls.@ 100 1 443 sipdir.online.lync.com 5 minutes
SRV: _sipfederationtls._tcp.@ 100 1 5061 sipfed.online.lync.com 5 minutes
MX: <MX-prefix>.mail.protection.outlook.com 5 minutes (Obtain MX-prefix from: https://admin.microsoft.com/AdminPortal/Home#/Domains)
CNAME: imap outlook.office365.com
CNAME: mail outlook.office365.com
CNAME: pop outlook.office365.com
CNAME: smtp smtp.office365.com
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# Quick DNS checkup:
nslookup -type=a autodiscover.domain.com
nslookup -type=cname autodiscover.domain.com
nslookup -type=a mail.domain.com 8.8.8.8
nslookup -type=cname mail.domain.com
nslookup -type=mx domain.com 8.8.8.8
nslookup -type=txt domain.com 8.8.8.8
nslookup -type=srv _sip._tls.domain.com 8.8.8.8
nslookup -type=srv _sipfederationtls._tcp.domain.com 8.8.8.8

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