See also Amavisd Bad Header Whitelist from Specific Mail Address DKIMĭKIM stands for Domain Keys Identified Mail and is used for the authentication of an email that’s being sent. ~all = strict should be the servers treating the emails (Soft Fail, Fail, Neutral ).a: = Add any other server hostname that may deliver or relay mail for this domain.ip4:103.224.12.12/32 = IP addresses in CIDR format that deliver or relay mail for this domain.a = Allow current IP address of the domain to send email for this domain.mx = Allow servers listed as MX to send email for this domain.An SPF record is a DNS TXT record containing a list of the IP addresses that are allowed to send email on behalf of your domain. With an SPF record in place, Internet Service Providers can verify that a mail server is authorized to send email for a specific domain. Sender Policy Framework (SPF) is used to authenticate the sender of an email. v=DMARC1 p=none rua=mailto: ruf=mailto: SPF This policy ensures that unauthorized email doesn’t get delivered at all. p=reject: The final policy and the ultimate goal of implementing DMARC.p=quarantine: Sends unauthorized emails to the spam folder. With DMARC you can tell the world how to handle the unauthorized use of your email domains by instituting a policy in your DMARC record. Where is is a free and open technical specification that is used to authenticate an email by aligning SPF and DKIM mechanisms. In theory, DMARC stands for Domain-based Message Authentication Reporting and Conformance (DMARC).
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