_spf.smtp.com DNS history

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First observed
SOA +1 -0
+ smtp.com 900 SOA ns-1304.awsdns-35.org awsdns-hostmaster.amazon.com 2 7200 900 1209600 86400
TXT +1 -0
+ _spf.smtp.com 3600 TXT "v=spf1 ip4:192.40.160.0/19 ip4:74.91.80.0/20 ~all"