7 Best SPF Flattening Tools in 2026: Flattening vs Macros Compared
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Last Updated: 8 min read
Key Takeaways
- An SPF flattening tool helps prevent SPF failures by keeping your SPF record within the 10-DNS-lookup limit.
- SPF lookup limits are often exceeded when organizations use several third-party email senders, such as Google Workspace, Microsoft 365, Salesforce, HubSpot, or SendGrid.
- Exceeding the SPF lookup limit can cause an SPF PermError, which may affect email authentication and deliverability.
- SPF flattening tools simplify SPF records by resolving nested include: mechanisms into a more compliant configuration.
- Advanced SPF management solutions use Hosted SPF or SPF Macros to keep records updated automatically when sender IPs change.
- SPF flattening is especially useful for enterprises, MSPs, MSSPs, compliance teams, and mid-market organizations managing multiple domains or senders.
What Is an SPF Flattening Tool?
An SPF flattening tool helps keep your SPF record within the 10-DNS-lookup limit defined by RFC 7208. SPF, or Sender Policy Framework, tells receiving mail servers which IP addresses and services are authorized to send email for your domain.
This limit becomes a problem when a domain uses multiple third-party senders, such as Google Workspace, Microsoft 365, Salesforce, HubSpot, Mailchimp, Zendesk, or SendGrid. Each include: mechanism can trigger additional DNS lookups, and exceeding the limit causes an SPF PermError, which may lead to legitimate emails failing authentication.
SPF flattening tools solve this by scanning your SPF record, resolving nested include: mechanisms, and creating a simplified or hosted SPF configuration. Advanced tools may also use Hosted SPF or SPF Macros to keep SPF records updated automatically when sender IPs change.
For a deeper technical explanation, read PowerDMARC’s guide to SPF flattening.
Who Needs an SPF Flattening Tool?
SPF flattening tools are useful for organizations that use several email-sending services or manage authentication across multiple domains.
- Enterprise IT and security teams: Prevent SPF lookup failures as new SaaS, marketing, regional, and transactional email tools are added.
- CISOs and compliance teams: Maintain cleaner authentication records and stronger visibility across SPF, DKIM, and DMARC.
- MSPs and MSSPs: Manage SPF records across client domains without manually troubleshooting DNS lookup issues for every new sender.
- Mid-market IT teams: Reduce manual DNS maintenance and quickly identify senders causing SPF authentication problems.
In general, if your SPF record includes several third-party senders or frequently changes, an SPF flattening tool can help reduce deliverability risk and simplify email authentication management.
How to Choose the Best SPF Flattening Tool
Use these criteria when comparing SPF flattening tools:
| Criteria | Why It Matters | What to Look For |
|---|---|---|
| Pricing | Total cost of ownership including per-domain or per-volume fees | Transparent pricing page; free tier or trial available |
| DNS Uptime & SLA | Downtime in hosted SPF infrastructure can break email delivery | Published uptime SLA of 99.9% or higher; redundant DNS infrastructure |
| Update Frequency | Vendors change IP ranges without notice; stale records cause silent failures | Automated monitoring with frequent or real-time IP updates |
| SPF Macro Support | Macros bypass static lookup limits for complex environments | Native SPF Macro support with hosted management |
| Ease of Setup | Complex onboarding increases time-to-value and implementation risk | One-click or guided setup; minimal DNS changes required |
| Scalability | Enterprise and MSP environments manage many domains simultaneously | Multi-domain support; role-based access; MSP multi-tenant dashboard |
| Source Visibility & Reporting | Identifying which senders are causing failures speeds up troubleshooting | Real-time dashboards showing authorized sources and SPF results |
| Broader Auth Platform | SPF works best as part of a complete DMARC, DKIM, MTA-STS stack | Unified platform managing DMARC, DKIM, BIMI, MTA-STS, TLS-RPT |
| Support Quality | Technical SPF issues often require expert guidance | 24/7 global support; fast response times; technical depth |
Best SPF Flattening Tools Compared
| Tool | Best For | SPF Method | Auto Updates | Multi-Domain | Full Auth Platform | Pricing (from) |
|---|---|---|---|---|---|---|
| PowerDMARC PowerSPF | Enterprises, MSPs, multi-domain | Hosted SPF + SPF Macros | ✅ Real-time | ✅ Yes | ✅ DMARC, SPF, DKIM, BIMI, MTA-STS, TLS-RPT | Add-on on Basic ($8/mo); included Enterprise |
| AutoSPF | SPF-focused; enterprise SLAs | Flattening (Plus); Macros (Premium+) | ✅ 15-min re-scan | ✅ Yes | ❌ SPF-only | $37/mo (1 domain) |
| MxToolbox Delivery Center Plus | DNS monitoring + SPF flattening | Traditional flattening | Plan-dependent | Up to 5 domains | Broader DNS/email suite | $399/mo (Plus required for SPF) |
| DMARCLY Safe SPF | Beginners, small teams | Traditional flattening | ✅ Yes | Plan-dependent | DMARC + related tools | From $17.99/mo |
| Red Sift Dynamic SPF | Enterprise brand protection | Dynamic (real-time) | ✅ Real-time | ✅ Yes | ✅ Full DMARC + brand | Enterprise quote |
| Valimail Instant SPF | Enterprise compliance | Patented macros | ✅ Real-time | ✅ Yes | ✅ Full suite | Public pricing not disclosed in verified source |
| Fraudmarc | Small business, simple setups | SPF compression | Limited | Limited | DMARC fraud prevention | ~$21/domain/mo (annual) |
7 Best SPF Flattening Tools
1. PowerDMARC Hosted SPF (PowerSPF)
PowerDMARC Hosted SPF, PowerSPF, helps organizations automate SPF management and avoid the 10-lookup limit without manually rewriting DNS records each time a sending vendor changes. It is part of PowerDMARC’s broader email authentication platform covering DMARC, SPF, DKIM, BIMI, MTA-STS, and TLS-RPT across domains from a single dashboard.
PowerSPF is especially useful for organizations with multiple email vendors, distributed teams, or growing SaaS environments. Unlike tools that only offer traditional flattening, PowerDMARC supports SPF Macros, a scalable optimization method designed for complex sender environments where static flattening can create stale-IP or record-length risks. For MSPs and MSSPs, the centralized client-domain monitoring reduces SPF-related support tickets and makes it easier to identify which sending source is causing failures.
Best for: Enterprises, MSPs/MSSPs, and multi-domain teams that need scalable, automated SPF management with broader email authentication coverage.
Key capabilities:
- SPF Macros for unlimited lookups without exceeding the RFC 7208 limit (available on higher-tier plans)
- Traditional SPF flattening for simpler setups or quick migrations
- Real-time IP updates; no manual DNS edits when vendors rotate IPs
- Automatic SPF error handling (Null SPF, Void Errors, PermError alerts)
- SPF Analytics: detailed visibility into every source sending on your behalf
- Multi-domain management with role-based access (MSP-ready)
- Available alongside DMARC, DKIM, BIMI, MTA-STS, TLS-RPT from one platform
- G2 Leader in DMARC Software for 12 consecutive quarters (May 2026)
Pricing: 15-day free trial (no credit card required). Basic plan: from $8/month (monthly) / $6.42/month (annual). PowerSPF available as add-on on Basic; included on Enterprise. Enterprise and Partner Program: custom quote.
Considerations: PowerDMARC is broader than an SPF-only utility. If you only need a lightweight SPF flattener for one domain, a dedicated SPF tool may be enough. If you need SPF, DMARC, DKIM, BIMI, MTA-STS, TLS-RPT, role-based access, and MSP workflows in one place, PowerDMARC is the stronger fit.
Get started with PowerDMARC’s hosted SPF solution
2. AutoSPF
AutoSPF (by DuoCircle LLC) is a purpose-built SPF management platform. Its Plus plan covers traditional SPF flattening; SPF Macros are available from the Premium plan upward. It does one thing, SPF, with enterprise-grade depth: signed SLAs (99.99% uptime on Enterprise), DPAs, NDAs, SSO/SAML, RBAC, audit logs, and DNS rollback.
Its 15-minute DNS re-scan cycle (Plus plan) catches vendor IP changes before they cause silent failures. The 30-day free trial (no credit card required) allows thorough evaluation.
Best for: Teams focused on dedicated SPF management with automated monitoring and enterprise SLAs, without needing a full DMARC platform.
Key capabilities:
- Traditional SPF flattening (Plus plan, $37/mo); SPF Macros from Premium ($97/mo)
- 15-minute DNS re-scan on Plus; more frequent on higher tiers
- Enterprise tier: SSO/SAML, 99.99% uptime SLA, DPA/NDA, audit logs, DNS rollback
- No email volume caps on any plan
Pricing: 30-day free trial with paid plan starting at $37/mo (1 domain)
Considerations: AutoSPF is SPF-focused. That is useful if SPF is the only problem you need to solve, but it can add tool sprawl if you also need DMARC monitoring, DKIM management, BIMI, MTA-STS, or TLS-RPT.
3. MxToolbox Delivery Center Plus
MxToolbox has nearly two decades in the DNS and email monitoring space. SPF Flattening is available specifically in the Delivery Center Plus plan. It is not included in the base Delivery Center plan ($129/mo), the SPF Flattening feature requires the Plus tier.
Best for: DNS and email monitoring users who want SPF flattening as part of a broader deliverability and DNS management toolset.
Key capabilities:
- SPF record flattening and automatic reconstruction (Delivery Center Plus only)
- Comprehensive DNS diagnostics: SPF, DKIM, DMARC, MX, blacklists, 20+ checks in one interface
- Inbox Placement Analysis, Recipient Complaint Reporting, Email Delivery Performance Reports
- Dedicated support for up to 5 domains at Plus tier
Pricing: Delivery Center: $129/mo (no SPF Flattening).
Considerations: If SPF flattening is your only requirement, MxToolbox may be more expensive than a dedicated SPF tool. It is more compelling when you need the surrounding delivery and DNS monitoring capabilities.
4. DMARCLY Safe SPF
DMARCLY’s SPF flattening feature, Safe SPF, is well-suited for teams new to email authentication. The clean interface and transparent pricing make it an accessible starting point. Organizations with highly complex SPF records should evaluate record-length constraints and update frequency.
Best for: Beginners and smaller teams seeking an easy-to-configure SPF flattening workflow with transparent pricing.
Key capabilities:
- Easy and fast SPF flattening setup
- Automatic record reconstruction when vendor IPs change
- Transparent pricing; helpful documentation resources
Pricing: Paid plan starts from $17.99/mo.
Considerations: The lowest $17.99/month Professional plan does not include Safe SPF in the retrieved pricing content. Teams choosing DMARCLY specifically for SPF flattening should start their comparison at the Growth tier or above.
5. Red Sift Dynamic SPF
Red Sift OnDMARC includes Dynamic SPF, an enterprise-grade solution that maintains a single optimised SPF record updated in real time when any vendor’s IP ranges change. Unlike static flattening, Dynamic SPF removes the IP staleness problem entirely.
Best for: Large enterprises that want SPF management integrated with broader email security, brand protection, DMARC enforcement, and compliance workflows.
Key capabilities:
- Real-time dynamic SPF management
- Fastest guided DMARC enforcement in industry (positioned as 6–8 weeks to p=reject)
- Brand protection and lookalike domain monitoring integrated with SPF management
Pricing: Enterprise quote only. Contact Red Sift for current pricing.
Considerations: Red Sift is likely a better fit for organizations evaluating full DMARC enforcement and brand protection, not teams looking only for the lowest-cost SPF flattening utility.
6. Valimail Instant SPF
Valimail (acquired by DigiCert in 2025) offers Instant SPF, a patented macro-based approach that generates SPF records dynamically per query, bypassing the 10-lookup limit. Positioned for large enterprise compliance environments.
Best for: Enterprise organizations with strong compliance requirements and complex sender ecosystems wanting a patented, vendor-backed approach.
Key capabilities:
- Patented macro-based SPF — no static IP lists, no staleness
- DMARC automation and BIMI support via Amplify add-on
- DigiCert integration for compliance-heavy organizations
Pricing: Public pricing not disclosed.
Considerations: Valimail is enterprise-oriented. It may be a strong fit for large compliance-heavy organizations, but smaller teams should confirm pricing and package scope before shortlisting it.
7. Fraudmarc
Fraudmarc focuses on fraud prevention using DMARC technologies and includes SPF compression as part of its service suite. Uses traditional compression techniques, appropriate for smaller, simpler environments.
Best for: Small businesses needing SPF compression with cost-effective, simple setup.
Key capabilities:
- SPF compression and management panel
- Dynamic SPF flattening and vendor removal
- Simple, straightforward interface
Pricing: Universal SPF Basic starts at ~$21/domain/month (billed annually).
Considerations: Per-domain pricing can be simple for small setups but may become expensive across many domains. MSPs and enterprises should compare total cost carefully.
Which is the Right SPF Flattening Tool for Your Organization
| Organization Type | Recommended Focus | Best-fit Tools |
|---|---|---|
| Small business | Ease of setup, low maintenance | DMARCLY Safe SPF, Fraudmarc Universal SPF |
| Mid-market IT team | Automation, reporting, support quality | PowerDMARC, AutoSPF |
| Enterprise | Scalability, compliance readiness, uptime SLA, 24/7 support | PowerDMARC, Red Sift, or Valimail. |
| MSP/MSSP | Multi-tenant management, role-based access, centralized reporting | PowerDMARC |
| DNS monitoring team | SPF flattening plus DNS/email diagnostics | MxToolbox Delivery Center Plus |
Frequently Asked Questions
What is the best SPF flattening tool?
The best SPF flattening tool depends on your organization’s complexity and requirements. For enterprises, MSPs, and multi-domain teams, PowerDMARC Hosted SPF (PowerSPF) offers SPF Macros, automated updates, source visibility, and a broader email authentication platform. For simpler environments, AutoSPF (dedicated SPF tool) or DMARCLY Safe SPF (beginner-friendly) are practical fits. Key criteria: automation, update frequency, SPF Macro support, multi-domain scalability, and support quality.
What is SPF flattening?
SPF flattening reduces the number of DNS lookups in an SPF record by replacing include: mechanisms with their resolved IP addresses. This keeps the record within the RFC 7208 limit of 10 DNS lookups, preventing SPF PermError and the email delivery failures it causes.
What is the difference between SPF flattening and SPF Macros?
SPF flattening resolves includes into static IP addresses, which must be re-updated when vendor IPs change. SPF Macros (RFC 7208 §7) bypass the 10-lookup limit entirely by delegating per-query resolution to a dynamic DNS service — the record is always current, never goes stale, and hides your sending infrastructure from public DNS enumeration.
What happens if an SPF record exceeds 10 DNS lookups?
If an SPF record exceeds 10 DNS lookups, it returns a PermError. Receiving mail servers that encounter a PermError may reject or fail to validate emails from your domain, causing legitimate messages to fail authentication and potentially affecting deliverability.
What is the difference between SPF flattening and hosted SPF?
Traditional SPF flattening replaces include: mechanisms with resolved IP addresses in a static record. Hosted SPF is a managed service where the SPF record is served from a provider’s infrastructure, enabling dynamic updates without manual DNS changes each time a vendor’s IP changes. Hosted SPF typically supports both flattening and more advanced methods like SPF Macros.
Is SPF flattening safe?
SPF flattening can be safe when the record is properly maintained. Manual flattening becomes risky when vendors change IP ranges and the record is not updated, leading to stale records and authentication failures. Automated tools that monitor and update records dynamically (like PowerSPF or AutoSPF) reduce this risk significantly.
Does SPF flattening improve email deliverability?
SPF flattening can help prevent SPF lookup-limit failures, which supports reliable authentication. When SPF passes consistently, it contributes to better deliverability outcomes alongside DKIM and DMARC. SPF flattening alone does not guarantee improved deliverability, but it removes a common cause of authentication failures.
How often should an SPF flattening tool update records?
Update frequency depends on the tool and plan. AutoSPF’s Plus plan rescans every 15 minutes; PowerSPF updates in real time. For organizations with multiple active email vendors, frequent automated updates are important because providers can change sending IPs without advance notice.
Do MSPs need automated SPF management?
MSPs and MSSPs benefit significantly from automated SPF management because it reduces manual DNS troubleshooting across client domains and helps identify sending-source issues faster. Platforms with multi-tenant dashboards and centralized monitoring, like PowerDMARC Hosted SPF, are particularly well suited for MSP workflows.
Content Specialist at PowerDMARC
Milena is a skilled writer and content creator with 7+ years of experience in crafting engaging content on IT, cybersecurity, virtual events, and more. She has a proven track record of delivering high-quality work for international magazines and is a graduate of prestigious institutions such as New York University Abu Dhabi, UWC China, and the College of Europe.
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