How to use SiteWorx to modify or create a DNS SPF record for the domain attached to your Nexcess account.
Sender Policy Framework (SPF) is an email validation system designed to prevent spam by verifying sender IP addresses and detecting email spoofing. SPF allows administrators to specify which hosts are allowed to send mail from a given domain by creating a specific SPF record or TXT record in the Domain Name System (DNS). Mail exchangers use the DNS to verify mail from a given domain is sent by a host sanctioned by that domain's administrators.
This method is only available for Nexcess clients on physical (non-cloud) accounts. For assistance with your cloud account, contact our 24-7 support team by email or through your Client Portal.
| SPF Setting | Description | Accepted Values |
|---|---|---|
| Use A Records? | Should the IP(s) reference in the DNS A Records for this domain be permitted to send mail? | Yes or No |
| Use MX Records? | Should the hostnames referenced in DNS MX Records for this domain be permitted to send mail? | Yes or No |
| Use PTR Records? | NOT RECOMMENDED Should the PTR Records for the sender's IP be used to validate the sender's domain? NOT RECOMMENDED. | Yes or No |
| Other Servers | Do any other hostnames or IPs need to be authorized to send mail for this domain? | Yes or No |
| Fallback | Defines how to respond if the record has produced no match. | 1) Fail. Mail should be rejected. 2) Soft fail. Mail is generally accepted but tagged. 3) Neutral. 4) Allow. |
| Redirect | Redirects verification to use the SPF record of the specified domain. This is useful, for example, if you send mail through your ISP's servers and they have defined an SPF record. | Valid domain name; e.g., "example.com" |
| Example | Defines a DNS name whose TXT Record may be returned along with failure messages. Rarely used, may not be universally supported. | Valid DNS name. |
For more detailed information about DNS SPF records, visit to the Sender Policy Framework Project website.
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