--> SPF stands for Sender Policy Framework, It is a text record created in Public DNS Server.
--> Using the SPF Text Record, an organization can publish a list of authorized mail servers that are allowed to send an email outside.
--> Without an SPF record, malicious actors may be able to spoof your domain and networks, harm your reputation and carry out cyberattacks that result in financial loss.
--> if you don’t have an SPF Record, servers that receive your emails may flag or reject them because they can't determine the authenticity of your domain.
--> Receiving mail servers can perform an SPF test on every inbound email, checking to see if the IP address from which the email is sent matches an IP address in the domain's Sender Policy Framework record.
--> SPF test result can be one of the following:
i) none: Unable to resolve domain name or find SPF record in the domain
ii) neutral: The domain does not explicitly state that the IP address is authorized
iii) fail (hard fail): The client is not allowed to use the domain (v=spf1 mx-all)
iv) fail (soft fail): The host is probably not authorized (Example:v=spf1 mx ~all)
v) temperror (Temporary error): SPF encountered a transient error like DNS timeout ( If the Public DNS Server of Sender Domain is having issue then we will see this issue and it usually goes away once the Publlic DNS Server starts reachable and responds to DNS Queries)
vi) permerror (Permanent error): Inability to correctly interpret the domain’s published records ( DNS lookup is taking long)
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