Registro DMARC
v=spf1 include:_spf.google.com include:_spf.automattic.com include:sendgrid.net include:mail.zendesk.com -all

Registro IPv4
host: knowledgewebsite.tumblr.com
class: IN
ttl: 300
type: A
ip: 74.114.154.22

Registro IPv4
host: knowledgewebsite.tumblr.com
class: IN
ttl: 300
type: A
ip: 74.114.154.18

Información TXT
host: knowledgewebsite.tumblr.com
class: IN
ttl: 3133
type: TXT
txt: v=spf1 include:_spf.google.com include:_spf.automattic.com include:sendgrid.net include:mail.zendesk.com -all
entries: v=spf1 include:_spf.google.com include:_spf.automattic.com include:sendgrid.net include:mail.zendesk.com -all