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Learning DNS for Developers

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amazon.com 216.73.216.30 Your IP DNS Lookup DNS Propagation Checker SPF Record Lookup A Record Lookup AAAA Record Lookup CNAME Record Lookup TXT Record Lookup MX Record Lookup

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smtp064-tb-c.heysender.com OPT records

Queried just now

No OPT records No OPT records found for smtp064-tb-c.heysender.com.

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