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SPF and DKIM

Sender Policy Framework (SPF)

SPF allows you to state which mail servers are allowed to send mail from your domain. The idea is that if someone else sends a mail that pretends to be from you from their own system, it will be recognised as invalid.

Other mails servers may choose to look at this as part of their spam filtering, so if your sent mails are being incorrectly categorised, you should look at setting this up. This is set in the DNS records for your domain and so (usually) is not under the control of NetManager. However, you can view your SPF records (if any) using E-Mail Administration > Validation > SPF.

DomainKeys Identified Mail (DKIM)

DomainKeys Identified Mail is an email authentication method designed to detect email spoofing. It allows the receiver to check that an email that claims to have come from a specific domain was indeed authorized by the owner of that domain. It goes further than SPF as the mail itself is altered to contain a signature which can be used by the recipient to check whether the important parts of the email have been tampered, such as the From address, To address, Subject and Date.

To enable DKIM on your outbound mails, enable it by setting mail_dkim_enable="y" in your configuration file and then running the sendmail build script.

Once you are actively signing your outbound emails with DKIM, you need to create a TXT record in the DNS records for your domain. If you go to E-Mail Administration > Validation > DKIM, the correct record will be displayed ready for you to copy and paste.