--- title: "Campaign Monitor SPF: How To Configure And Verify Email Authentication | DuoCircle" description: "Configure and verify your Campaign Monitor SPF record to authenticate email, improve deliverability, prevent spoofing, and protect your domain reputation." image: "https://www.duocircle.com/images/og-default.png" canonical: "https://www.duocircle.com/blog/campaign-monitor-spf-how-to-configure-and-verify-email-authentication/" --- Quick Answer Setting up Campaign Monitor SPF helps authenticate your email campaigns and support reliable delivery. Learn how to add the required SPF DNS record, verify your configuration, identify common SPF errors, and follow best practices for stronger email authentication and domain reputation. Share [ ](https://www.linkedin.com/sharing/share-offsite/?url=undefined%2Fblog%2Fcampaign-monitor-spf-how-to-configure-and-verify-email-authentication%2F "Share on LinkedIn") [ ](https://twitter.com/intent/tweet?text=Campaign%20Monitor%20SPF%3A%20How%20To%20Configure%20And%20Verify%20Email%20Authentication&url=undefined%2Fblog%2Fcampaign-monitor-spf-how-to-configure-and-verify-email-authentication%2F "Share on X/Twitter") [ ](https://www.facebook.com/sharer/sharer.php?u=undefined%2Fblog%2Fcampaign-monitor-spf-how-to-configure-and-verify-email-authentication%2F "Share on Facebook") [ ](https://reddit.com/submit?url=undefined%2Fblog%2Fcampaign-monitor-spf-how-to-configure-and-verify-email-authentication%2F&title=Campaign%20Monitor%20SPF%3A%20How%20To%20Configure%20And%20Verify%20Email%20Authentication "Share on Reddit") [ ](mailto:?subject=Campaign%20Monitor%20SPF%3A%20How%20To%20Configure%20And%20Verify%20Email%20Authentication&body=Check out this article: undefined%2Fblog%2Fcampaign-monitor-spf-how-to-configure-and-verify-email-authentication%2F "Share via Email") ![Email Authentication Setup](https://media.mailhop.org/duocircle/365-to-365-migration-4501-1789547298586.jpg) Properly configuring SPF for Campaign Monitor can strengthen email authentication and provide receiving servers with additional evidence that your messages are authorized. An accurately set SPF record assists receiving mail servers in verifying the legitimacy of messages sent on your behalf. While SPF is vital, it should be part of a comprehensive authentication strategy. DKIM provides cryptographic verification, and DMARC ensures SPF and/or DKIM align with the displayed From domain. Together, these technologies safeguard against spoofing, enhance email security, and improve domain activity visibility. This guide details SPF setup with Campaign Monitor, preparation steps before DNS changes, adding the correct SPF mechanism, avoiding common errors, and verifying **authentication post-configuration**. ## What SPF Is and Why It Matters for Campaign Monitor Deliverability The Sender Policy Framework (SPF) is an email authentication protocol that enables domain owners to specify authorized sending sources via DNS. Typically, SPF records are stored as TXT records and start with the `v=spf1` tag. When an email is received by services like Gmail or Outlook, the server verifies the sender’s infrastructure against the **domain’s SPF settings**. Depending on the outcome, the email may receive various authentication statuses, such as pass, fail, softfail, or neutral. _For Campaign Monitor users, SPF is beneficial as it designates Campaign Monitor as an authorized sender for the domain, aiding mailbox providers in differentiating legitimate email campaigns from spam._ However, SPF alone does not guarantee that emails will land in the inbox; deliverability is influenced by factors including [sender reputation](https://emaillabs.io/en/understanding-email-sender-reputation-and-how-it-affects-email-deliverability/), message quality, DKIM, DMARC, and [mailbox provider](https://en.wikipedia.org/wiki/Mailbox%5Fprovider) policies. Additionally, incorrect SPF settings can lead to significant **authentication and delivery** challenges. SPF and DKIM perform different functions: - SPF authorizes sending servers or infrastructure. - DKIM uses a cryptographic signature to authenticate the message. - DMARC checks **SPF and DKIM alignment** with the visible From domain. - DNS stores the authentication records used during these checks. For businesses and marketers, SPF is integral to a comprehensive [email security](https://www.duocircle.com/) and deliverability strategy, not just a DNS configuration.![Office 365 Migration 4502](https://media.mailhop.org/duocircle/office-365-migration-4502-1789547585703.jpg) ## How Campaign Monitor Handles Email Authentication and Sender Domains Campaign Monitor enables **domain authentication**, allowing organizations to send campaigns from a branded domain. This process typically requires the addition of [DNS records](https://www.cloudflare.com/learning/dns/dns-records/) provided by Campaign Monitor, which may involve DKIM entries and SPF authorization, depending on the account configuration. Since the required DNS values may vary based on the account setup and authentication methods, administrators should verify the specific values in their Campaign Monitor account before implementation. A commonly referenced **Campaign Monitor SPF mechanism** is: ``` include:_spf.createsend.com ``` A complete SPF record using that mechanism may look like: ``` v=spf1 include:cmail1.com ~all ``` This serves as a guideline rather than a definitive standard. If your domain currently uses Google Workspace, Microsoft 365, ActiveCampaign, [CRM systems](https://nexalab.io/blog/customer-relationship-management-system/), transactional email services, or similar platforms for email, please update the **existing SPF record** instead of adding a new one. For example, a domain that already authorizes Google and Campaign Monitor could use a combined record similar to: ``` v=spf1 include:_spf.google.com include:cmail1.com ~all ``` Your organization’s SPF record must accurately represent its sending services. A key SPF guideline is that a domain must not contain multiple independent SPF TXT records. If two records starting with `v=spf1` exist for the same hostname, it may result in an SPF PermError. Typically, authorized services should be consolidated into a **single SPF policy**. For Campaign Monitor, custom domain configuration is essential for authentication. _Managing your own authentication enhances control over SPF, DKIM, and DMARC alignment, helping to maintain a consistent branded identity._ ## Prerequisites Before Configuring SPF for Campaign Monitor Before changing DNS, gather the information required to understand your **existing email environment**. This helps prevent accidental authorization failures. You should have: - Access to your DNS provider, such as Cloudflare, Hostinger, GoDaddy, or another DNS service. - Administrator access to Campaign Monitor. - The Campaign Monitor authentication instructions for your domain. - Your existing SPF record, if one is already published. - A complete list of legitimate **email-sending services**. - Existing DKIM records for other platforms. - Your current DMARC record and reporting configuration. - A method for testing SPF after the change. The authorized senders list is crucial, especially since organizations often use multiple email platforms. For instance, [Google Workspace](https://jumpcloud.com/blog/what-is-google-workspace) might manage employee emails while Campaign Monitor handles newsletters and a CRM sends customer alerts. Before modifying the SPF record, ensure you identify all valid senders. Failing to do so may lead to unintentional removal of authorization for another service when adding Campaign Monitor. Additionally, document the **current DNS record** prior to any changes. Keeping the existing value allows for easier comparison during troubleshooting if needed.![Email Migration Service 4503](https://media.mailhop.org/duocircle/email-migration-service-4503-1789547610270.jpg) ## Finding the Correct Campaign Monitor SPF Record and Adding It in DNS To ensure security, begin by accessing your Campaign Monitor account. Navigate to the domain authentication settings to examine the provided authentication records. If Campaign Monitor recommends a **specific SPF include**, incorporate it into your current SPF record. ### Step 1: Locate Your Current SPF Record Open your DNS provider and review the TXT records for the relevant domain. Look for a record beginning with: `v=spf1` If there’s no SPF record, you should create one. If one is already present, update it instead of making a duplicate. ### Step 2: Add the Campaign Monitor Include If your Campaign Monitor configuration specifies: `include:cmail1.com` add it to your existing SPF policy. For example: ``` v=spf1 include:_spf.google.com include:cmail1.com ~all ``` This example authorizes both **Google and Campaign Monitor**. Your actual record may contain additional mechanisms for other approved senders. ### Step 3: Avoid Multiple SPF Records Never create a second SPF record simply because you are adding a new sending service. Instead, combine legitimate senders into the existing SPF policy. ### Step 4: Choose an Appropriate SPF Policy An [SPF record](https://www.duocircle.com/resources/spf-records-explained/) commonly ends with a qualifier such as: `~all` or: `-all` A **softfail (\~all) signals** that sources deviating from the policy should be viewed with suspicion, though rejection isn’t mandatory. _In contrast, a hard fail (-all) is more punitive. Organizations should select their policy according to their overall sender inventory and level of authentication maturity._ ![Phishing Protection 4504](https://media.mailhop.org/duocircle/phishing-protection-4504-1789547636287.jpg) ### Step 5: Save the DNS Change Publish the updated TXT record at the hostname specified by your authentication configuration. If Campaign Monitor is using a subdomain for sending, make sure the record is published at the correct subdomain rather than automatically changing the root domain. ### Step 6: Verify the Domain Return to Campaign Monitor and use its **domain verification process**. DNS changes may not be detected immediately because DNS propagation can take time. ### Step 7: Run an Independent SPF Check Use an SPF validation or DNS lookup tool to confirm that the record resolves correctly and includes Campaign Monitor. ### Step 8: Send a Test Campaign Send a test email to Gmail, Outlook, or another provider. Check the message headers to verify SPF and DKIM pass and if DMARC alignment is achieved. This process facilitates consistent **SPF configuration** and authentication troubleshooting. ## Avoiding Common SPF Configuration Mistakes and Lookup Limits A frequent error with SPF is the presence of multiple records for a single domain; ideally, one SPF policy should exist for each hostname. Another key factor is the **10-DNS-lookup cap**. SPF checks may require [DNS queries](https://bunny.net/academy/dns/what-is-a-dns-and-recursive-query/) from mechanisms like include, redirect, a, and mx, and nested includes can further inflate this number. For organizations using various platforms — such as Google Workspace, Microsoft 365, and others — managing SPF can quickly become complex, as each service impacts the overall SPF configuration. A practical review should include: 1. Review all existing DNS records. 2. Locate the current SPF record. 3. Add the Campaign Monitor mechanism to the existing record. 4. Check the resulting lookup count. 5. **Validate SPF syntax.** 6. Send a test message. 7. Inspect authentication results. Do not adopt SPF records from arbitrary tutorials without verifying your domain’s specific settings. What functions for one organization may not be suitable for another. Ensure that your SPF accurately reflects the authorized [mail servers](https://www.techtarget.com/whatis/definition/mail-server-mail-transfer-transport-agent-MTA-mail-router-Internet-mailer) for your domain.![Dmarc Report 4505](https://media.mailhop.org/duocircle/dmarc-report-4505-1789547702949.jpg) ## How SPF Works With DKIM, DMARC, and Custom Sending Domains SPF, DKIM, and DMARC work together effectively. _SPF checks if the sending server is permitted by the domain’s SPF policy, while DKIM authenticates the message through a cryptographic signature._ DMARC assesses if the authenticated **SPF or DKIM domain** matches the displayed From domain. For Campaign Monitor, it’s essential to configure SPF and DKIM in tandem rather than as separate tasks. A typical authentication process looks like this: - Open Campaign Monitor’s domain authentication settings. - Review the authentication records supplied for your domain. - Copy the SPF and DKIM values. - Add the appropriate records to your DNS provider. - Return to Campaign Monitor and verify the domain. - Test the configuration using **independent authentication tools.** - Send real test messages and inspect their headers. Custom sending domains are essential for ensuring a consistent [email branding](https://www.emailonacid.com/blog/article/email-marketing/email-branding/) and aligning authentication with the organization’s displayed From domain. However, a **successful SPF result** doesn’t guarantee a DMARC pass; if the authenticated envelope domain doesn’t match the visible From domain, DMARC may still fail. Likewise, DKIM can succeed but DMARC may not if the signing domain is misaligned. Understanding these nuances is crucial for resolving authentication issues. ## How to Verify Campaign Monitor SPF Authentication and Troubleshoot Failures Once the SPF record is published, verification requires more than just confirming its existence in the DNS. Begin by sending a test email via Campaign Monitor, then check the message headers in **Gmail or Microsoft Outlook** to find the authentication results. Check for: - SPF pass or fail - DKIM pass or fail - DMARC pass or fail - The authenticated envelope domain - The DKIM signing domain If SPF fails, investigate the DNS configuration before changing other authentication records. Common causes include: - The Campaign Monitor SPF include was added to the wrong hostname. - Multiple **SPF TXT records** exist. - The SPF syntax is malformed. - The domain exceeds the 10-DNS-lookup limit. - A required sender was accidentally removed. - The wrong subdomain was authenticated. - DNS propagation has not completed. - The envelope sender domain differs from the domain you expected. Ensure that the authentication settings for mail sent from news.example.com align with the correct sending domain and Campaign Monitor setup. It’s crucial to differentiate between **SPF and DMARC failures**. SPF may succeed while DMARC fails due to domain misalignment. Consequently, troubleshooting should assess SPF, DKIM, and DMARC collectively rather than isolating one result.![Anti Phishing Software 4056](https://media.mailhop.org/duocircle/anti-phishing-software-4056-1789547722134.jpg) ## Best Practices for Maintaining SPF and Email Authentication Over Time Configuring SPF is an ongoing process, as changes in email infrastructure occur with the addition of new systems like CRMs, [marketing platforms](https://www.zoho.com/marketingplus/what-is-a-unified-marketing-platform.html), or ecommerce applications. It’s essential to keep a record of all authorized email senders, including services like Campaign Monitor. This inventory aids administrators in detecting **redundant SPF mechanisms** and minimizes the risk of authentication failures due to vendor changes. Review SPF periodically and check: - Whether every SPF include is still required. - Whether the lookup count is approaching the limit. - Whether old email services can be removed. - Whether Campaign Monitor authentication remains valid. - Whether [DKIM records](https://www.duocircle.com/resources/dkim-checker/) are correctly configured. - Whether DMARC reports show unexpected senders. DMARC reporting enhances visibility into authentication activities, enabling organizations to distinguish between **valid and unauthorized sources** while assessing the consistency of SPF and DKIM results. _For domains with a monitoring policy like p=none, stronger DMARC enforcement may be pursued once legitimate sources are identified and validated._ Additionally, it’s crucial to document the internal SPF process, detailing the location of Campaign Monitor values, DNS management, SPF validation methods, review of test messages, and escalation procedures for authentication failures. This documentation minimizes errors when new administrators are onboarded or when DNS providers or email platforms are switched. ![Brad Slavin](https://media.mailhop.org/dmarcreport/images/team/brad-slavin.jpg) Brad Slavin General Manager General Manager at DuoCircle. Product strategy and commercial lead across the email security portfolio. ## Secure your email infrastructure Protect, authenticate, and deliver. Contact our team to find the right solution. [Contact Sales](/contact/) [Explore Products](/products/) Share this article [ ](https://www.linkedin.com/sharing/share-offsite/?url=https%3A%2F%2Fwww.duocircle.com%2Fblog%2Fcampaign-monitor-spf-how-to-configure-and-verify-email-authentication%2F) [ ](https://twitter.com/intent/tweet?text=Campaign%20Monitor%20SPF%3A%20How%20To%20Configure%20And%20Verify%20Email%20Authentication&url=https%3A%2F%2Fwww.duocircle.com%2Fblog%2Fcampaign-monitor-spf-how-to-configure-and-verify-email-authentication%2F) [ ](https://www.facebook.com/sharer/sharer.php?u=https%3A%2F%2Fwww.duocircle.com%2Fblog%2Fcampaign-monitor-spf-how-to-configure-and-verify-email-authentication%2F) Copy Related Articles - [ ![DKIM Authentication Testing Reports](https://media.mailhop.org/alumniforwarding/dkim-record-check-0101-1780314508116.jpg) 10 DKIM Authentication Testing Reports Every Security Team Should Review Blog ](/blog/10-dkim-authentication-testing-reports-every-security-team-should-review/) - [ ![Email retention strategies](https://media.mailhop.org/duocircle/hosted-email-server-3001-1782806532877.jpg) 10 Email Retention Strategies For Managing High-Volume Mailboxes Blog ](/blog/10-email-retention-strategies-for-managing-high-volume-mailboxes/) - [ ![SPF Configuration Errors for MSPs](https://media.mailhop.org/duocircle/office-365-migration-service-4221-1780655000236.jpg) Preventing SPF Configuration Errors: 11 Recommendations For MSPs Blog ](/blog/11-preventing-spf-configuration-errors-recommendations-for-managed-service-providers/) - [ ![Email Warm-Up](https://media.mailhop.org/duocircle/spf-record-check-0143-1783069826033.jpg) 12 Ways To Maintain Email Deliverability After Completing Email Warm-Up Blog ](/blog/12-ways-maintain-email-deliverability-after-completing-email-warm-up/) ## Related Articles [ intermediate 10 DKIM Authentication Testing Reports Every Security Team Should Review Jun 1, 2026 ](/blog/10-dkim-authentication-testing-reports-every-security-team-should-review/)[ intermediate 10 Email Retention Strategies For Managing High-Volume Mailboxes Jun 30, 2026 ](/blog/10-email-retention-strategies-for-managing-high-volume-mailboxes/)[ intermediate Preventing SPF Configuration Errors: 11 Recommendations For MSPs Jun 5, 2026 ](/blog/11-preventing-spf-configuration-errors-recommendations-for-managed-service-providers/)[ intermediate 12 Ways To Maintain Email Deliverability After Completing Email Warm-Up Jul 3, 2026 ](/blog/12-ways-maintain-email-deliverability-after-completing-email-warm-up/) ```json {"@context":"https://schema.org","@type":"Organization","name":"DuoCircle LLC","url":"https://www.duocircle.com","logo":{"@type":"ImageObject","url":"https://www.duocircle.com/images/duocircle-logo.png"},"description":"DuoCircle is a portfolio of specialized email products covering protection, authentication, delivery, and routing. 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