How to check your DNS records

This is for techies/nerds:

Check CNAME:
nslookup smart.customer.com
(this should point to whs.sendergen.com)

Check SPF:
nslookup -type=txt customer.com

Check DKIM:
nslookup -type=txt sg._domainkey.customer.com

Check DMARC:
nslookup -type=txt _dmarc.customer.com
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