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Learning DNS for Developers

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amazon.com 216.73.216.106 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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smtp30.hosting90.cz SPF record

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No SPF record No SPF record found for smtp30.hosting90.cz

check TXT records