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Configure Sender Policy Framework (SPF)

What is SPF?

Sender Policy Framework (SPF) is an industry standard record used to prevent domain spoofing and spam by verifying the source for e-mail messages. It is a method of informing servers whether a specific mail server is authorized to send an email for a particular domain. Recipients can refer to the SPF record to determine whether a message claiming to be from your domain comes from an authorized mail server. An SPF record increases the likelihood that emails sent by valid addresses are delivered.

To Add/Edit DNS Records for SPF

If you have an existing SPF record then insert the following directive into your existing record:

include:spf.criticalimpactinc.com

If you do not have an existing SPF record then create a DNS entry of type TXT for the domain. Leave the hostname or subdomain field blank. An example DNS entry is provided below.

v=spf1 a mx ptr include:spf.criticalimpactinc.com ~all

If you are not comfortable modifying your domains DNS records, please contact your account manager. Do NOT delete your existing SPF records. Instead, add the missing directive to your existing records. There should only be one SPF1 record.

To Add/Edit DNS Records for DKIM

The entire ARC Authentication-Results header is comprised of both the SPF record and the DomainKeys Identified Mail (DKIM) record. To fully authenticate your sending domain, please request authentication instructions by sending an email to support@criticalimpact.com. We will provide the necessary unique domain keys per domain.

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