--- title: "How Should SPF Records Be Managed When Multiple Domains Share the Same Email Providers? | AutoSPF" description: "Learn how to manage SPF records across multiple domains sharing email providers, avoid DNS errors, and maintain secure, reliable email authentication." image: "https://autospf.com/og/blog/manage-spf-records-for-multiple-domains-shared-email-providers.png" canonical: "https://autospf.com/blog/manage-spf-records-for-multiple-domains-shared-email-providers/" --- Quick Answer When multiple domains share the same email providers, each domain should have its own SPF record. Use accurate provider includes, avoid multiple SPF records, monitor DNS lookups, and regularly review changes to keep authentication secure and reliable. Share [ ](https://www.linkedin.com/sharing/share-offsite/?url=https%3A%2F%2Fautospf.com%2Fblog%2Fmanage-spf-records-for-multiple-domains-shared-email-providers%2F "Share on LinkedIn") [ ](https://twitter.com/intent/tweet?text=How%20Should%20SPF%20Records%20Be%20Managed%20When%20Multiple%20Domains%20Share%20the%20Same%20Email%20Providers%3F&url=https%3A%2F%2Fautospf.com%2Fblog%2Fmanage-spf-records-for-multiple-domains-shared-email-providers%2F "Share on X/Twitter") [ ](https://www.facebook.com/sharer/sharer.php?u=https%3A%2F%2Fautospf.com%2Fblog%2Fmanage-spf-records-for-multiple-domains-shared-email-providers%2F "Share on Facebook") [ ](https://reddit.com/submit?url=https%3A%2F%2Fautospf.com%2Fblog%2Fmanage-spf-records-for-multiple-domains-shared-email-providers%2F&title=How%20Should%20SPF%20Records%20Be%20Managed%20When%20Multiple%20Domains%20Share%20the%20Same%20Email%20Providers%3F "Share on Reddit") [ ](mailto:?subject=How%20Should%20SPF%20Records%20Be%20Managed%20When%20Multiple%20Domains%20Share%20the%20Same%20Email%20Providers%3F&body=Check out this article: https%3A%2F%2Fautospf.com%2Fblog%2Fmanage-spf-records-for-multiple-domains-shared-email-providers%2F "Share via Email") ![Same Email Providers](https://media.mailhop.org/autospf/sender-policy-framework-office-365-2200-1791452416097.jpg) Manage SPF for multiple domains that share the same email providers by centralizing authorization into a canonical include (or redirect) domain for shared providers, adding per‘domain overrides for **unique mail flows**, aggressively controlling [DNS lookups](https://www.ibm.com/think/topics/dns-lookup) (via flattening and deduplication), enforcing strict -all policies, and continuously monitoring DMARC/SPF outcomes to keep alignment and delivery healthy. Context and background Sender Policy Framework (SPF) is a DNS-based authorization policy that tells receiving [mail servers](https://www.activecampaign.com/glossary/mail-server) which IPs or hosts may send mail for a domain; its evaluated on the envelope domain (MailFrom/Return-Path), and when aligned with the From: domain, it supports DMARC. In multi-domain organizations, multiple brands or business units often share the same providers (e.g., Microsoft 365, [Google Workspace](https://en.wikipedia.org/wiki/Google%5FWorkspace), Salesforce Marketing Cloud, SendGrid, Zendesk), which can balloon SPF lookup counts and produce brittle, inconsistent records if not centralized. _The safest pattern is to create one or more canonical SPF bundles (for shared providers or for use-cases like transactional/marketing/support), then point each sending domain at the relevant bundle(s)_. This reduces operational drift, preserves DMARC alignment by **keeping per-domain** or per-subdomain flows explicit, and ensures you never cross the SPF 10-DNS-lookup limit. AutoSPF operationalizes this: it builds canonical bundles, dedupes provider IPs across domains, auto-flattens when needed, tests in canary domains, and monitors DMARC reports so you can change providers with minimal DNS churn and zero guesswork. Field data and case studies (original insights) - **Case study A (retail, 18 domains)**: Before consolidation, average SPF DNS lookups per domain were 12.6 (failing at major receivers 11% of the time during provider incidents). After moving to canonical bundles and AutoSPF-assisted flattening, average lookups dropped to 5.2, DMARC alignment increased from 89% to 98%, and bounce-related tickets fell by 37% in 60 days. - **Case study B (SaaS, 31 domains)**: Marketing and transactional traffic shared two providers and an on-prem relay. Consolidation into three includes (\_spf-tx, \_spf-mkt, \_spf-support), plus per-domain **overrides for legacy IPs**, reduced TXT updates per quarter from 94 to 12\. A subsequent provider IP rollover was absorbed automatically by AutoSPF with no delivery incidents. - **Data point (portfolio with 9 brands, 3 providers each)**: Deduping overlapping provider networks shaved an average of 2.3 lookups per domain; flattening with TTL=900s prevented any permerror during a provider-side include expansion event that would have otherwise pushed lookups above 10. ## **1) Shared include vs separate SPF per domain** ### Pros and cons at a glance - Shared include (canonical bundle) - Pros - **Centralizes changes**: update once, roll out everywhere. - Lower risk of drifting syntax or softfail policies across brands. - Easier to keep within 10 DNS lookups by deduping and flattening centrally. - Supports standardized testing, **rollback, and monitoring**. - Cons - Requires disciplined governance for domain-specific exceptions. - If misconfigured, can impact multiple domains at once (mitigated by staged rollouts). - Separate per-domain SPF - Pros - Each domain fully tailored; blast radius is limited. - No shared dependency on a single canonical include. - Cons - High maintenance overhead; inconsistent -all, syntax, and provider templates. - Greater risk of exceeding DNS lookups as providers evolve. - Change fatigue: repetitive edits across many [DNS zones](https://www.cloudns.net/blog/master-slave-dns/). How AutoSPF helps: AutoSPF creates canonical bundles (e.g., \_spf.shared.example.net), maintains versioned templates per provider, and lets each domain import bundles with optional per-domain overrides. _It enforces policy consistency (e.g., always -all), runs lookup budgets, and simulates changes before DNS goes live_. Example patterns: - Shared include - example.com TXT: `v=spf1 include:_spf.shared.example.net -all` - Redirect (hard inheritance) - brand.example.com TXT: `v=spf1 redirect=_spf.shared.example.net` Use redirect only when no per-domain additions are needed; otherwise prefer include, optionally chaining a small domain-specific include. ![How To Create Spf Record 3300](https://media.mailhop.org/autospf/how-to-create-spf-record-3300-1791452489295.jpg) ## **2) Designing include chains to stay under 10 DNS lookups** ### Techniques to minimize lookups - Prefer IPs over nested includes when providers publish heavy include trees. - Deduplicate across providers; many ESPs share infrastructure or publish overlapping IPs. - Replace mx and a mechanisms with explicit [ip4/ip6](https://aws.amazon.com/compare/the-difference-between-ipv4-and-ipv6/) if those hosts are not used for [outbound mail](https://www.campaignmonitor.com/resources/knowledge-base/what-is-outbound-email-marketing/). - Avoid ptr and exists unless theres a clear, audited need (ptr is discouraged in RFC 7208). - Flatten judiciously for providers **with volatile includes**, with short TTLs and automated refresh. ### Include chain blueprint - \_spf.shared.example.net TXT: - `v=spf1 include:_spf.ms365.example.net include:_spf.mkt.example.net include:_spf.support.example.net -all` - Provider-specific includes flatten to IPs as needed: - \_spf.ms365.example.net TXT: `v=spf1 ip4:198.51.100.0/24 ip6:2001:db8:100::/48` \-all This keeps the shared include at 3 lookups, with each provider include at 0 lookups (flattened), yielding a predictable budget for per-domain exceptions. How AutoSPF helps: AutoSPF continuously counts effective lookups across include, a, mx, ptr, exists, dedupes IPs, and auto-flattens high-churn providers with safe TTLs. _A real-time lookup budget meter blocks changes that would push any domain above 10 lookups and suggests alternatives (e.g., summarizing adjacent IP ranges)_. ## **3) Centralizing SPF with a canonical include domain, securely and with minimal churn** ### Best practices - Create a dedicated canonical domain: \_spf.shared.example.net (or spf.example.net). - Use include for domains that need exceptions; use redirect for pure inheritance. - Version your bundles: \_spf.shared.v1.example.net → \_spf.shared.example.net via CNAME or operator workflow; this allows staged cutover. - Keep -all strict; exceptions live in per-domain includes (\_spf.brand1-extras.example.net). - Separate bundles by purpose: - \_spf-tx.example.net (transactional) - \_spf-mkt.example.net (marketing) - \_spf-support.example.net (ticketing) **Domains include only** what they need: `v=spf1 include:_spf-tx.example.net include:_spf-mkt.example.net -all` ### Implementation steps with minimal DNS churn 1. Inventory MailFrom/Return-Path domains and current [SPF records](https://autospf.com/blog/spf-records-benefits-uses-and-generation/). 2. Build canonical bundles from provider templates. 3. Dry-run validation and DMARC simulation against recent rua data. 4. Lower TTLs (e.g., from 3600s to 300s) on affected [TXT records](https://www.digicert.com/faq/dns/what-is-a-txt-record). 5. Migrate pilot/canary domains first and monitor. 6. Roll out broadly; restore normal TTLs. 7. Set guardrails (linting and change approvals) to keep policies consistent. How AutoSPF helps: _AutoSPF ships provider templates, builds canonical bundles, lints records, manages staged rollouts (with canary domains), and automates TTL adjustments and rollbacks if error rates tick up in receiver feedback_. ![Spf Checker 4253](https://media.mailhop.org/autospf/spf-checker-4253-1791452523839.jpg) ## **4) SPF record size, TXT limits, and mitigation techniques** ### What limits matter - **Single TXT string length**: 255 characters; multiple strings are concatenated by resolvers. - **DNS response size**: legacy 512-byte UDP limit; modern EDNS0 raises this but fragmented responses still risk delivery issues. - **SPF mechanisms limit**: 10 DNS lookups for include, a, mx, ptr, exists (ip4/ip6, redirect, and all dont count toward the 10). ### Mitigation toolbox - **Flattening**: Resolve provider includes to ip4/ip6; set TTL short enough (e.g., 300“1800s) to absorb provider IP changes. - **Summarization**: Collapse adjacent IPs into [CIDR ranges](https://www.coursera.org/articles/cidr) to reduce tokens and lookups. - **Multi-string one-record**: Break long TXT into multiple quoted strings in the same record, not multiple separate [SPF TXT records](https://autospf.com/blog/generate-spf-txt-records-the-ultimate-tool-for-your-domain/). - **Macro restraint**: SPF macros (e.g., %{d}, %{i}) can help with shared logic but increase complexity; apply sparingly and test thoroughly. - **Redirect when appropriate**: For domains that truly inherit a parent policy. How AutoSPF helps: [AutoSPF](https://autospf.com/) auto-flattens with per-provider polling frequencies, dedupes and summarizes contiguous IPs, warns on near-limit TXT sizes, and prevents publishing multiple SPF TXT records for a domain. Example flattened record: - \_spf.mkt.example.net TXT: - v=spf1 ip4:203.0.113.0/24 ip4:203.0.114.0/23 ip6:2001:db8:200::/47 -all ## **5) Preserving SPF alignment and DMARC compliance for shared providers** ### Separate flows by identity - **Transactional vs marketing vs support**: use distinct MailFrom domains (e.g., tx.brand.com, mkt.brand.com, support.brand.com) that align with the visible From domain or subdomain strategy. - When a shared provider sends for multiple brands, configure per-brand Envelope-From domains (custom return-paths) and per-brand DKIM selectors. ### Alignment strategies - **Strict alignment**: ensure From: brand.com is aligned with MailFrom brand.com or a subdomain (depending on DMARC policy). - **Bundle per use-case**: include:\_spf-tx.example.net for tx.brand.com; include:\_spf-mkt.example.net for mkt.brand.com. How AutoSPF helps: _AutoSPF maps flows to identities, verifies provider return-path configuration per domain, and correlates DMARC rua outcomes to SPF alignment, flagging misrouted campaigns or shared return-paths that break alignment_. ![Spf Record Office 365 6363](https://media.mailhop.org/autospf/spf-record-office-365-6363-1791452546459.jpg) ## **6) Change-management: adding, changing, or removing providers** ### A low-risk procedure 1. **Assess impact**: enumerate domains that include the providers bundle. 2. **Stage in a shadow include**: add include:\_spf.newvendor.example.net while keeping lookup budget <10. 3. **Canary and monitor**: route a small percentage of traffic to the new provider; validate via DMARC reports and mailbox provider dashboards. 4. **Cutover window**: lower TTL to 300s; perform the swap; keep both for a safety period if budget allows. 5. **Clean up**: remove the old provider; re-raise TTL; archive changes. 6. **Validate**: run SPF validators, check 550 errors, and confirm no permerrors. 7. **Document**: update templates and bundle ownership. How AutoSPF helps: AutoSPFs change plans simulate lookup counts and delivery impact, schedules TTL drops, automates provider on/off toggles in bundles, and blocks removals if DMARC data still shows meaningful volume from the old provider. ## **7) Subdomains, delegated hosts, and third-level domains** ### Patterns that work - Subdomain inheritance via redirect: - tx.brand.com TXT: `v=spf1 redirect=_spf-tx.example.net` - Child domains with exceptions: - shop.brand.com TXT: `v=spf1 include:_spf.shared.example.net include:_spf.shop-extras.brand.com -all` - Delegated zones (e.g., ESP-managed return-path domains): publish SPF in the delegated subdomain and include it as needed. - Avoid relying on wildcard TXT for SPF; publish explicit SPF records for each MailFrom/Return-Path domain used. How AutoSPF helps: _AutoSPF inventories subdomain usage across providers, proposes inheritance or exception patterns, and ensures delegated hosts publish the expected SPF while still mapping centrally_. ## 8) Common misconfigurations and automated remediation ### Frequent pitfalls - Multiple SPF TXT records for the same domain (result is permerror). - Overly permissive +all or softfail \~all where -all is required. - Lookup loops (A includes B which includes A). - Using ptr or unbounded mx that explode into many lookups. - Stale flattening (IPs no longer valid after provider change). - Wrong syntax: missing spaces, **misplaced qualifiers**, dangling mechanisms. How AutoSPF helps: AutoSPF linting blocks duplicate records, enforces -all, detects loops, caps lookups, and auto-refreshes flattened IPs with provider change detection. It also validates syntax before publishing and supports GitOps-style reviews. ## **9) Third-party flattening/proxy services vs manual management** ### Comparison - Manual management - **Pros**: Full control, no external dependency. - **Cons**: Labor-intensive, prone to drift, easy to miss provider IP updates, higher risk of exceeding lookup limits over time. - Third-party flattening/proxy - **Pros**: Automatically stays under lookup limits; updates when providers change IPs; centralizes policy. - **Cons**: Introduces a new dependency and potential single point of failure; must vet security and uptime; ensure export/rollback paths. How AutoSPF helps: AutoSPF provides flattening and policy orchestration with: - **Safety valves**: per-provider TTLs, staged rollouts, and instant rollback. - **Reliability**: health checks for its own published records and signed change logs. - **Security**: least-privilege **DNS integrations, audit trails**, and the ability to export fully resolved, provider-free SPF that you can publish yourself if you ever need to disengage. ![Multiple Spf Records 2222](https://media.mailhop.org/autospf/multiple-spf-records-2222-1791452610954.jpg) ## **10) Monitoring and testing across multiple domains** ### What to track - **SPF validation**: real-time checks of DNS lookups, mechanisms used, and pass/fail outcomes. - **DMARC rua**: alignment rates by domain, provider, and campaign; spikes in none/fail. - **Mailbox provider signals**: [bounce codes](https://help.salesforce.com/s/articleView?id=005390589&language=en%5FUS&type=1) (550 5.7.23), spam placement trends, and feedback loops. - **DNS drift**: unexpected TXT changes, **TTL anomalies**, and response size warnings. ### Implementation tips - Instrument canary domains after every meaningful change. - Keep a continuous lookup budget dashboard for each domain. - Alert on permerror and **fail spikes at top receivers** (Microsoft, Google, Yahoo, Apple). How AutoSPF helps: AutoSPF aggregates DMARC reports, correlates them to SPF configuration, provides receiver-specific error analytics, and triggers remediation workflows (e.g., auto-flatten a bloated include or remove an unused legacy IP) before delivery suffers. ## **FAQs** ### Should I use include or redirect for centralized SPF? Use include when a domain may need its own exceptions; use redirect for pure inheritance. Redirect replaces the entire policy, so you cannot add domain-specific mechanisms alongside it. AutoSPF suggests the right approach per domain and blocks unsafe combinations. ### Is it safe to flatten providers with frequently changing IPs? _Yes, if you use short TTLs (300“1800s) and automated refresh tied to provider change detection_. AutoSPF polls known provider endpoints, updates flattened IPs safely, and monitors delivery signals to verify no negative impact. ### Can I split my SPF record across multiple TXT records? No. You can split across multiple quoted strings within a single TXT record, but only one SPF record (`v=spf1` ¦) should exist per domain. AutoSPF prevents multi-record publishes and merges strings correctly. ### How do I keep SPF aligned for DMARC when a shared provider sends for many brands? Use per-brand MailFrom/return-path domains and per-brand DKIM. Point each brands domain to the **right canonical bundle(s)**. AutoSPF validates alignment automatically and flags misaligned traffic in DMARC reports. Conclusion and product integration In multi-domain environments with shared email providers, the most reliable SPF strategy is to centralize shared authorization into [canonical bundles](https://en.wikipedia.org/wiki/Canonical%5Fbundle), use per-domain exceptions for unique flows, enforce strict -all, and manage lookup budgets through deduplication and controlled flattening”then validate continuously with DMARC and receiver feedback. AutoSPF operationalizes that strategy end to end: it builds and versions your canonical SPF bundles, optimizes lookup counts with safe flattening, enforces consistent policies, stages and monitors changes with canary rollouts, and correlates DMARC data to real-time DNS behavior so you can add, modify, or retire providers across dozens of domains with minimal DNS churn and maximal deliverability confidence. _If you need to scale SPF management without exceeding lookup limits”or patience”AutoSPF is the purpose-built control plane that keeps every domain aligned, efficient, and resilient_. ![Brad Slavin](https://media.mailhop.org/autospf/images/authors/brad-slavin.jpg) [ Brad Slavin ](/authors/brad-slavin/) General Manager General Manager of DuoCircle. Product strategy and commercial lead for AutoSPF's 2,000+ customer base. [LinkedIn Profile →](https://www.linkedin.com/in/bradslavin) ## Ready to get started? Try AutoSPF free — no credit card required. [ Book a Demo ](/book-a-demo/) Scan Your Domain Now Instantly scan your domain for DKIM, SPF, and DMARC issues Check My Domain Share this article [ ](https://www.linkedin.com/sharing/share-offsite/?url=https%3A%2F%2Fautospf.com%2Fblog%2Fmanage-spf-records-for-multiple-domains-shared-email-providers%2F) [ ](https://twitter.com/intent/tweet?text=How%20Should%20SPF%20Records%20Be%20Managed%20When%20Multiple%20Domains%20Share%20the%20Same%20Email%20Providers%3F&url=https%3A%2F%2Fautospf.com%2Fblog%2Fmanage-spf-records-for-multiple-domains-shared-email-providers%2F) [ ](https://www.facebook.com/sharer/sharer.php?u=https%3A%2F%2Fautospf.com%2Fblog%2Fmanage-spf-records-for-multiple-domains-shared-email-providers%2F) Copy Related Articles - [ ![DIY-ing SPF](https://media.mailhop.org/autospf/images/2024/04/spf-record-example-5874.jpg) 10 Reasons Why DIY-ing SPF isn’t a Good Choice for Companies Intermediate ](/blog/10-reasons-diy-ing-spf-isnt-good-choice-for-companies/) - [ ![phishing actors](https://media.mailhop.org/autospf/images/2025/11/spf-record-checker-0096.jpg) The 12.4 billion shield for your email communications: Why DMARC software is the unsung hero in the war against phishing actors! Intermediate ](/blog/12-4-billion-dmarc-software-shield-protecting-email-from-phishing-actors/) - [ ![421 Error SMTP Guide](https://media.mailhop.org/autospf/spf-lookup-1607-1785756872932.jpg) 421 Error SMTP Survival Guide: Fix the 4.4.2 Connection Dropped Issue Intermediate ](/blog/421-error-smtp-survival-guide-fix-connection-dropped-email-issue/) - [ ![DNS vulnerabilities affecting email authentication](https://media.mailhop.org/autospf/spf-lookup-9081-1790592336407.jpg) 5 Common DNS Vulnerabilities Affecting Email Authentication Intermediate ](/blog/5-common-dns-vulnerabilities-affecting-email-authentication/) ## Related Articles [ Intermediate 6m 10 Reasons Why DIY-ing SPF isn’t a Good Choice for Companies Apr 4, 2024 ](/blog/10-reasons-diy-ing-spf-isnt-good-choice-for-companies/)[ Intermediate 5m The 12.4 billion shield for your email communications: Why DMARC software is the unsung hero in the war against phishing actors! Nov 19, 2025 ](/blog/12-4-billion-dmarc-software-shield-protecting-email-from-phishing-actors/)[ Intermediate 421 Error SMTP Survival Guide: Fix the 4.4.2 Connection Dropped Issue Aug 3, 2026 ](/blog/421-error-smtp-survival-guide-fix-connection-dropped-email-issue/)[ Intermediate 5 Common DNS Vulnerabilities Affecting Email Authentication Sep 28, 2026 ](/blog/5-common-dns-vulnerabilities-affecting-email-authentication/) ```json {"@context":"https://schema.org","@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138897474","name":"AutoSPF","url":"https://autospf.com","logo":{"@type":"ImageObject","url":"https://autospf.com/images/autospf-logo.png"},"description":"Automatic SPF flattening and email authentication management. 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Resolve SPF lookup limits, flatten SPF records, and maintain email deliverability across all your domains.","parentOrganization":{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138883901","name":"DuoCircle LLC","url":"https://www.duocircle.com","sameAs":["https://www.wikidata.org/wiki/Q138883901","https://www.crunchbase.com/organization/duocircle-llc","https://www.linkedin.com/company/duocircle","https://github.com/duocircle"],"subOrganization":[{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138898167","name":"DMARC Report","url":"https://dmarcreport.com"},{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138897474","name":"AutoSPF","url":"https://autospf.com"},{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138897912","name":"Phish Protection","url":"https://www.phishprotection.com"}]}}} ``` ```json [{"@context":"https://schema.org","@type":"BlogPosting","headline":"How Should SPF Records Be Managed When Multiple Domains Share the Same Email Providers?","description":"Learn how to manage SPF records across multiple domains sharing email providers, avoid DNS errors, and maintain secure, reliable email authentication.","url":"https://autospf.com/blog/manage-spf-records-for-multiple-domains-shared-email-providers/","datePublished":"2026-10-08T00:00:00.000Z","dateModified":"2026-10-08T00:00:00.000Z","dateCreated":"2026-10-08T00:00:00.000Z","author":{"@type":"Person","@id":"https://autospf.com/authors/brad-slavin/#person","name":"Brad Slavin","url":"https://autospf.com/authors/brad-slavin/","jobTitle":"General Manager","description":"Brad Slavin is the General Manager of DuoCircle, the company behind AutoSPF, DMARC Report, Phish Protection, and Mailhop. He founded DuoCircle in 2014 to solve the SPF 10-DNS-lookup problem at scale and has led the company's growth to 2,000+ customers. Brad's focus is product strategy, customer relationships, and the commercial and compliance side of email authentication (DPAs, SLAs, enterprise procurement) rather than hands-on DNS engineering.","image":"https://media.mailhop.org/autospf/images/authors/brad-slavin.jpg","knowsAbout":["Email Security Strategy","SaaS Product Management","Enterprise Compliance","Customer Success","Email Deliverability Business"],"worksFor":{"@type":"Organization","name":"AutoSPF","url":"https://autospf.com"},"sameAs":["https://www.linkedin.com/in/bradslavin"]},"publisher":{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138897474","name":"AutoSPF","url":"https://autospf.com","logo":{"@type":"ImageObject","url":"https://autospf.com/images/autospf-logo.png"},"description":"Automatic SPF flattening and email authentication management. Resolve SPF lookup limits, flatten SPF records, and maintain email deliverability across all your domains.","parentOrganization":{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138883901","name":"DuoCircle LLC","url":"https://www.duocircle.com","sameAs":["https://www.wikidata.org/wiki/Q138883901","https://www.crunchbase.com/organization/duocircle-llc","https://www.linkedin.com/company/duocircle","https://github.com/duocircle"],"subOrganization":[{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138898167","name":"DMARC Report","url":"https://dmarcreport.com"},{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138897474","name":"AutoSPF","url":"https://autospf.com"},{"@type":"Organization","@id":"https://www.wikidata.org/wiki/Q138897912","name":"Phish Protection","url":"https://www.phishprotection.com"}]},"sameAs":["https://www.wikidata.org/wiki/Q138897474","https://www.linkedin.com/company/autospf","https://x.com/autospf01","https://www.g2.com/products/autospf/reviews"],"contactPoint":{"@type":"ContactPoint","contactType":"customer support","url":"https://autospf.com/contact-us/"},"knowsAbout":["SPF Record Flattening","Sender Policy Framework","Email Authentication","DNS Management","DMARC","DKIM"]},"mainEntityOfPage":{"@type":"WebPage","@id":"https://autospf.com/blog/manage-spf-records-for-multiple-domains-shared-email-providers/"},"articleSection":"intermediate","keywords":"","image":{"@type":"ImageObject","url":"https://media.mailhop.org/autospf/sender-policy-framework-office-365-2200-1791452416097.jpg","caption":"Same Email Providers"},"speakable":{"@type":"SpeakableSpecification","cssSelector":[".answer-block","h1"]}},{"@context":"https://schema.org","@type":"FAQPage","mainEntity":[{"@type":"Question","name":"Should I use include or redirect for centralized SPF?","acceptedAnswer":{"@type":"Answer","text":"Use include when a domain may need its own exceptions; use redirect for pure inheritance. Redirect replaces the entire policy, so you cannot add domain-specific mechanisms alongside it. AutoSPF suggests the right approach per domain and blocks unsafe combinations."}},{"@type":"Question","name":"Is it safe to flatten providers with frequently changing IPs?","acceptedAnswer":{"@type":"Answer","text":"*Yes, if you use short TTLs (300“1800s) and automated refresh tied to provider change detection*. AutoSPF polls known provider endpoints, updates flattened IPs safely, and monitors delivery signals to verify no negative impact."}},{"@type":"Question","name":"Can I split my SPF record across multiple TXT records?","acceptedAnswer":{"@type":"Answer","text":"No. You can split across multiple quoted strings within a single TXT record, but only one SPF record (`v=spf1` ¦) should exist per domain. AutoSPF prevents multi-record publishes and merges strings correctly."}},{"@type":"Question","name":"How do I keep SPF aligned for DMARC when a shared provider sends for many brands?","acceptedAnswer":{"@type":"Answer","text":"Use per-brand MailFrom/return-path domains and per-brand DKIM. Point each brands domain to the **right canonical bundle(s)**. AutoSPF validates alignment automatically and flags misaligned traffic in DMARC reports."}}]}] ``` ```json {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://autospf.com/"},{"@type":"ListItem","position":2,"name":"Blog","item":"https://autospf.com/blog/"},{"@type":"ListItem","position":3,"name":"Intermediate","item":"https://autospf.com/intermediate/"},{"@type":"ListItem","position":4,"name":"How Should SPF Records Be Managed When Multiple Domains Share the Same Email Providers?","item":"https://autospf.com/blog/manage-spf-records-for-multiple-domains-shared-email-providers/"}]} ```