Sender Policy Framework (SPF) is a DNS record that tells receiving mail servers which systems are authorized to send email on behalf of your domain. A properly configured SPF record helps prevent spoofing and improves email deliverability to providers such as Gmail, Microsoft, and Yahoo.
When you host email with Sectorlink, your domain’s SPF record must explicitly authorize Sectorlink’s mail infrastructure to send outbound mail.
Required SPF Record for Sectorlink
For domains using Sectorlink’s hosting and email services, the SPF record should be set to:
v=spf1 include:cloudsector.net -all
This record authorizes Sectorlink’s mail servers (via cloudsector.net) to send mail for your domain and instructs receiving servers to reject mail sent from any unauthorized source.
What This Record Means
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v=spf1
Declares the SPF version. -
include:cloudsector.net
Authorizes Sectorlink’s outbound mail servers. -
-all
Enforces a hard fail for any server not listed. Mail sent from unauthorized servers should be rejected.
How to Add or Update the SPF Record
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Log in to your DNS provider (this may be your domain registrar or DNS host).
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Locate the DNS records for your domain.
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Add a new TXT record or edit the existing SPF record.
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Use the following values:
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Type: TXT
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Host / Name:
@(or leave blank, depending on provider) -
Value:
v=spf1 include:cloudsector.net -all
-
-
Save the record and allow time for DNS propagation (up to 24 hours, though often much faster).
Important Notes
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A domain should only have one SPF record. If one already exists, it must be merged rather than duplicated.
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If you send mail from additional services (for example, Microsoft 365, Google Workspace, or a third-party SMTP service), those providers must be added to the same SPF record.
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Using
-allis recommended for maximum protection. Changing this to~all(soft fail) weakens enforcement and is not advised unless explicitly required for troubleshooting.
