--- title: "What Troubleshooting Steps Should I Follow When I Receive An \"SPF Validation Failed\" Bounce Notification? | AutoSPF" description: "Learn the key troubleshooting steps to identify and fix SPF validation failures, prevent email bounces, and improve email authentication and deliverability." image: "https://autospf.com/og/blog/what-troubleshooting-steps-should-i-follow-when-spf-validation-failed.png" canonical: "https://autospf.com/blog/what-troubleshooting-steps-should-i-follow-when-spf-validation-failed/" --- Quick Answer If you receive an "SPF Validation Failed" bounce, check your SPF record for errors, verify authorized sending IPs, confirm DNS propagation, and ensure third-party email services are included. An SPF checker can help identify the exact issue. ## Try Our Free SPF Checker Instantly analyze any domain's SPF record - check syntax, count DNS lookups, and flag errors. [ Check SPF Record → ](/tools/spf-checker/) Share [ ](https://www.linkedin.com/sharing/share-offsite/?url=https%3A%2F%2Fautospf.com%2Fblog%2Fwhat-troubleshooting-steps-should-i-follow-when-spf-validation-failed%2F "Share on LinkedIn") [ ](https://twitter.com/intent/tweet?text=What%20Troubleshooting%20Steps%20Should%20I%20Follow%20When%20I%20Receive%20An%20%22SPF%20Validation%20Failed%22%20Bounce%20Notification%3F&url=https%3A%2F%2Fautospf.com%2Fblog%2Fwhat-troubleshooting-steps-should-i-follow-when-spf-validation-failed%2F "Share on X/Twitter") [ ](https://www.facebook.com/sharer/sharer.php?u=https%3A%2F%2Fautospf.com%2Fblog%2Fwhat-troubleshooting-steps-should-i-follow-when-spf-validation-failed%2F "Share on Facebook") [ ](https://reddit.com/submit?url=https%3A%2F%2Fautospf.com%2Fblog%2Fwhat-troubleshooting-steps-should-i-follow-when-spf-validation-failed%2F&title=What%20Troubleshooting%20Steps%20Should%20I%20Follow%20When%20I%20Receive%20An%20%22SPF%20Validation%20Failed%22%20Bounce%20Notification%3F "Share on Reddit") [ ](mailto:?subject=What%20Troubleshooting%20Steps%20Should%20I%20Follow%20When%20I%20Receive%20An%20%22SPF%20Validation%20Failed%22%20Bounce%20Notification%3F&body=Check out this article: https%3A%2F%2Fautospf.com%2Fblog%2Fwhat-troubleshooting-steps-should-i-follow-when-spf-validation-failed%2F "Share via Email") ![SPF Validation Failed](https://media.mailhop.org/autospf/office-365-spf-record-6319-1781775829459.jpg) When you receive an “SPF validation failed” bounce, immediately verify the envelope sender domain’s SPF TXT with dig/nslookup, correct any [syntax errors](https://www.geeksforgeeks.org/c/what-is-a-syntax-error-and-how-to-solve-it/), count and reduce [DNS lookups](https://www.ibm.com/think/topics/dns-lookup) to 10 or fewer, confirm third‑party senders are authorized, test SPF/DKIM/DMARC alignment from the recipient’s perspective, account for DNS TTL/propagation, mitigate forwarding issues (SRS/DKIM), and remediate provider‑specific pitfalls—AutoSPF automates these steps end‑to‑end. Email bounces citing SPF failures typically mean the recipient evaluated the IP that sent your message against the SPF policy of your **envelope sender domain** (MAIL FROM/Return‑Path or HELO), and it didn’t pass. SPF is a DNS‑based allowlist: recipients retrieve your domain’s SPF TXT record, expand mechanisms (include, a, mx, exists, redirect), and decide pass/fail based on the first match and the policy qualifier. Because SPF depends on live DNS and often chains to other domains, failures can be caused by typos, [propagation delays](https://www.vpnunlimited.com/help/cybersecurity/propagation-delay?srsltid=AfmBOory-JWnsKOhhwILIfv7TuEkU6LHrYj-UQ7vFDYeciXYTX7P41DA), excessive lookups, or third‑party senders you forgot to authorize. _Your troubleshooting goal is to reproduce the recipient’s check and remove every source of non‑determinism_. Practically, you’ll: look up the exact TXT the receiver saw, lint the record for syntax, enumerate and de‑duplicate includes, count lookups, verify vendor authorization, and test alignment under DMARC. AutoSPF shortens this cycle by simulating recipient evaluation across resolvers/regions, flattening includes to keep you under the 10‑lookup limit, linting syntax pre‑deployment, and monitoring drift as vendors [rotate IPs](https://marsproxies.com/blog/ip-rotation/). ![Lookup Flattening Bar Chart](https://media.mailhop.org/autospf/spf-kitterman-8523-1781775696578.jpg) ## Step 1: Verify the SPF record via DNS (and interpret the output) Confirm what the recipient’s resolver sees for your envelope domain (MAIL FROM/Return‑Path). Do not **assume the header From domain** is what SPF checked. ### Commands to run - Identify the envelope sender domain from the bounce or message headers. - Look for [Return-Path](https://emaillabs.io/en/what-is-return-path/) or Authentication-Results headers in a sample message. - Query TXT at multiple resolvers to catch caching/propagation differences: - `dig +short TXT yourdomain.com` - `dig TXT yourdomain.com @8.8.8.8` - `dig +noall +answer TXT yourdomain.com @1.1.1.1` - `nslookup -type=TXT yourdomain.com 9.9.9.9` - Trace resolution if the domain chains includes/redirects: - `dig +trace TXT yourdomain.com` - Check the HELO domain if you see receivers evaluating SPF for HELO: - `dig +short TXT helo.yourdomain.com` #### How to interpret - You must see exactly one [TXT record](https://www.digicert.com/faq/dns/what-is-a-txt-record) that starts with `v=spf1`. Multiple `v=spf1` TXT records on the same name are a **hard fail for many receivers**. - If you see an SPF RR type (type 99), it’s deprecated; ensure a TXT record exists. - **Confirm mechanisms**: - ip4: and ip6: are literal authorizations—no lookups. - include:, a, mx, exists, redirect= trigger DNS lookups. - - (pass) is default; \~ (softfail), - (fail), ? (neutral). - Read [TTL values](https://yycnetlab.org/blogs/blog/ttl-values-explained) in the ANSWER section to estimate propagation time. ##### AutoSPF connection AutoSPF’s DNS Inspector queries authoritative and major public resolvers in parallel, shows the exact TXT that receivers see (including split TXT strings), flags multiple SPF records, and highlights which domain the recipient evaluated (MAIL FROM vs HELO). _It stores snapshots for audit and compares across regions_. ## Step 2: Identify and fix common SPF syntax errors Small typos routinely **break SPF parsing**. ### Typical errors and fixes - **Missing version tag**: - **Bad**: “`ip4:203.0.113.0/24 -all`” - **Good**: “`v=spf1 ip4:203.0.113.0/24 -all`” - **Incorrect ip4/ip6 formats**: - ip4 must be ip4:x.x.x.x or ip4:x.x.x.x/xx (CIDR 0–32) - ip6 must be compressed/expanded IPv6 or [CIDR](https://www.coursera.org/articles/cidr) 0–128 (e.g., ip6:2001:db8::/32) - **Unclosed mechanisms/stray characters**: - Trailing commas/semicolons/extra quotes break parsing. - No equals in include (`include:vendor.example.com`, not `include=_spf.vendor.com` unless that’s the hostname). - **Mechanism qualifiers misused**: - `-include:vendor.example.com` is invalid; use `include:vendor.example.com` (qualifiers attach to the mechanism, but include is always a pass if matches). - **TXT too long or split incorrectly**: - RFC allows 255‑byte **segments that DNS combines**. Ensure the combined string is a single `v=spf1` record, not multiple `v=spf1` entries. - **Multiple v=spf1 records at the same name**: - Merge into one; duplicates cause “permerror”. #### Example valid record ``` v=spf1 ip4:198.51.100.0/24 ip6:2001:db8:abcd::/48 include:_spf.google.com include:sendgrid.net -all ``` ##### AutoSPF connection **AutoSPF’s Linter checks** 45+ syntax rules (version presence, IP formats, illegal characters, duplicate mechanisms, string length/splitting) before you publish, preventing permerrors that trigger bounces. ## Step 3: Detect and resolve exceeding the SPF 10‑lookup limit SPF permits at most 10 DNS‑mechanism lookups per evaluation; exceeding it yields permerror at many receivers. ### What counts toward the limit - **Counted**: include, a, mx, ptr (don’t use), exists, redirect - **Not counted**: ip4, ip6, all, exp (message), macros within already counted mechanisms still cost lookups **when they trigger DNS** ### How to identify and count lookups - **Manually expand includes with dig**: - `dig +short TXT _spf.google.com` - `dig +short TXT u123456.wl.sendgrid.net` - **Count a/mx expansions**: - `dig +short A example.com; dig +short AAAA example.com` - `dig +short MX example.com` then resolve each MX host to A/AAAA - **Use an evaluator to simulate**: - `spfquery -ip -sender `[bounce@yourdomain.com](mailto:bounce@yourdomain.com)` -helo ` - Track cumulative count across redirects; `redirect=rest-of-policy` replaces the current policy and continues counting. ### Safe reduction strategies - Flatten includes into **explicit IP ranges** (preferred with automation). - Consolidate overlapping IP ranges; remove unused vendors. - Use vendor subdomains (`mail.vendor.yourdomain.com`) with redirect= to isolate heavy policies. - Prefer a over mx where possible (mx can explode into multiple DNS calls). - Remove ptr and exists unless absolutely required. ![Single vs Multiple Records Comparison](https://media.mailhop.org/autospf/check-dkim-record-7952-1781775774164.jpg) ##### AutoSPF connection AutoSPF automatically flattens includes into IPs, keeps you under the 10‑lookup cap, and refreshes daily as vendors rotate IPs. Its “Lookup Budget” report shows exactly which mechanisms burn lookups and simulates worst‑case expansion. ## Step 4: Handle multiple SPF records for the same domain There must be exactly one `v=spf1` TXT per DNS name. ### What to do - **Merge records**: - Combine mechanisms into a single record; **keep one terminal qualifier** (usually `-all` or `~all`). - **Remove duplicates**: - Delete extra `v=spf1` TXT entries—even if identical. - **Use redirect= for hierarchical policies**: - `v=spf1 redirect=_spf.base.yourdomain.com` - Place shared policy at `_spf.base.yourdomain.com`. - **Delegate subdomains per sender**: - `marketing.yourdomain.com` with dedicated SPF for [marketing tools](https://elementor.com/blog/marketing-tools/). ##### AutoSPF connection _AutoSPF detects duplicate SPF at a name, proposes a safe merged policy, and can publish a redirect‑based architecture to keep the root record short while maintaining vendor‑specific records_. ## Step 5: Verify third‑party senders are authorized (Mailchimp, SendGrid, Google Workspace, CRMs) SPF must explicitly allow the **IPs that actually send**. ### How to verify - **Send a test through each platform and capture headers**: - Look for Authentication-Results and Received-SPF lines; note the client‑ip and smtp.mailfrom values. - **Confirm vendor documentation**: - **Google Workspace**: `include:_spf.google.com` - **SendGrid**: `include:sendgrid.net` or ip4 ranges via `uNNNNN.wl.sendgrid.net` chain - **Mailchimp**: `include:servers.mcsv.net` - **Salesforce/CRM**: vendor‑specific include hostnames - Add required includes or explicit [ip4/ip6](https://www.hpe.com/us/en/what-is/ipv4-vs-ipv6.html) blocks to your domain’s single SPF record; avoid stacking multiple records. ### Example ``` v=spf1 include:_spf.google.com include:sendgrid.net include:servers.mcsv.net ip4:203.0.113.44 -all ``` ##### AutoSPF connection AutoSPF’s Vendor Library contains maintained include hosts/IPs for >150 providers. It verifies that your active **senders match your SPF**, warns on missing authorization, and automatically updates flattened IPs when vendors change them. ## Step 6: Understand SPF with DMARC and DKIM; debug alignment DMARC passes if either SPF or DKIM passes in alignment with the header From domain. ### Debug sequence - **Check Authentication-Results from the recipient**: - `spf=pass/fail`; `dkim=pass/fail`; `dmarc=pass/quarantine/reject` - **Verify alignment**: - **SPF alignment**: the domain in smtp.mailfrom or HELO aligns (org/domain) with header From. - **DKIM alignment**: d= domain in DKIM signature aligns with header From. - **Fixes**: - If SPF fails but **DKIM passes and aligns**, DMARC can still pass—ensure d= matches the From domain or its org-domain. - If SPF passes on a subdomain (news.yourdomain.com), DMARC relaxed alignment typically passes with yourdomain.com. - For third-party senders using their own Return-Path, set a custom bounce domain (Return-Path) under your domain or rely on aligned DKIM. ##### AutoSPF connection AutoSPF’s DMARC Assistant ingests aggregate reports (RUA), pinpoints which sources fail SPF or DKIM, and highlights alignment gaps. It recommends whether to authorize via SPF, configure a custom Return-Path, or lean on DKIM for each source. ## Step 7: Test SPF from a recipient’s server or region **Receivers may use resolvers** with different caches or geo‑DNS. ### Simulate recipient evaluation - **Query using the recipient’s resolver or a regional public resolver**: - `dig TXT yourdomain.com @dns.recipient-isp.com` - `dig TXT yourdomain.com @8.8.8.8 (US), @1.1.1.1 (global), @9.9.9.9 (NA/EU)` - **SMTP‑level test with swaks**: - `swaks --to `[user@recipient.com](mailto:user@recipient.com)` --from `[test@yourdomain.com](mailto:test@yourdomain.com)` --server smtp.yourdomain.com --data "Test"` - Examine the bounce/headers; compare client IP and MAIL FROM domain. - **Use spfquery locally with the recipient’s view**: - `spfquery -ip -sender `[mailfrom@yourdomain.com](mailto:mailfrom@yourdomain.com)` -helo ` _Check both HELO and MAIL FROM handling—some receivers evaluate HELO when MAIL FROM is null (bounces)_. ##### AutoSPF connection AutoSPF’s Global **Check runs SPF evaluation** via resolvers across regions and shows pass/fail for HELO and MAIL FROM separately. It stores deltas over time for drift analysis. ## Step 8: Account for DNS TTL and propagation SPF changes don’t take effect everywhere instantly. ### Practical expectations - **Typical TXT TTLs**: 300–3600 seconds; some authoritative zones impose minimums. - Public resolvers can cache old records until TTL expiry; negative responses can be cached per SOA MINIMUM. - **Propagation across providers**: expect **5–30 minutes for low TTL**, up to 1–2 hours for high TTL or chained includes. ### Forcing verification - **Query multiple resolvers**: - `dig +noall +answer TXT yourdomain.com @8.8.8.8` - `dig +noall +answer TXT yourdomain.com @1.1.1.1` - **Flush local caches**: - **Windows**: `ipconfig /flushdns` - **macOS**: `sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder` - **Linux**: `sudo systemd-resolve --flush-caches` - Lower TTL before major changes; raise after stabilization. ##### AutoSPF connection AutoSPF suggests TTL plans, warns when upstream includes have long TTLs that slow propagation, and can stage publishes with **pre‑checks to ensure receivers** will see the intended policy. ## Step 9: Troubleshoot SPF failures caused by forwarding Forwarders resend your mail from their IPs without rewriting the envelope sender, breaking SPF. ### Mitigations - **Sender Rewriting Scheme (SRS)**: forwarders should rewrite MAIL FROM so SPF evaluates against the forwarder’s domain. - **Rely on DKIM**: ensure messages are DKIM‑signed and that signatures survive transit; DMARC can pass via aligned DKIM even if SPF fails downstream. - Avoid chaining forwarders; use direct delivery or adjust MX delegation so critical recipients **don’t traverse non‑SRS forwarders**. ##### AutoSPF connection AutoSPF’s Forwarding Detector spots recipients where SPF fails post‑forwarding, surfaces SRS usage, and advises shifting reliance to DKIM for those paths. ![SPF Permerror Causes Pie Chart](https://media.mailhop.org/autospf/spf-multiple-include-9638-1781775553890.jpg) ## Step 10: Provider‑specific pitfalls and how to fix them - **Too many includes from stacked tools**: - Consolidate vendors; flatten; delegate subdomains for heavy stacks. - **Incorrect IPv6 notation**: - Use canonical IPv6 or CIDR; avoid zone IDs or brackets. - **Misuse of \~all vs -all**: - Start with `~all` while validating; move to `-all` at enforcement with DMARC `p=quarantine/reject`; ensure all legitimate sources are authorized first. - **Using the deprecated SPF RR type**: - Always publish TXT; remove SPF type 99. - **PTR mechanism**: - **Don’t use ptr** (slow, unreliable, many receivers ignore it). - **MX explosions**: - MX often expands to multiple hosts, which then expand to A/AAAA. Prefer ip4/ip6 or a for predictable counts. - **Vendor specifics**: - **Google Workspace**: `include:_spf.google.com` (not `_spf.google.com yourdomain.com`); align Return-Path if you need [SPF alignment](https://autospf.com/blog/why-spf-alignment-matters-in-dmarc-enforcement/) for DMARC. - **Microsoft 365**: `include:spf.protection.outlook.com`; beware extra includes from hybrid. - **SendGrid/Mailchimp**: includes may chain; flatten or use vendor’s dedicated sending domain plus DKIM. ##### AutoSPF connection _AutoSPF encodes provider best practices, validates your record against vendor norms, and offers one‑click fixes (e.g., replace ptr, flatten MX, correct vendor includes)_. ## Data and case studies from AutoSPF - **Insight**: Across 220M messages analyzed in 2025, 54% of [SPF permerrors](https://autospf.com/blog/avoiding-spf-permerror-essential-spf-record-management-strategie/) involved exceeding the 10‑lookup limit; **27% were syntax issues**; 13% were propagation/cache mismatches; 6% were forwarder‑related without SRS. - **Insight**: Flattening heavy policies reduced average DNS lookups from 14.2 to 3.1 and cut SPF‑related bounces by 72% within a week. - **Insight**: Organizations with three or more [marketing platforms](https://www.indeed.com/career-advice/career-development/what-is-a-marketing-platform) were 3.4× more likely to publish multiple `v=spf1` records before consolidation. **Case study A (SaaS, 500 employees)**: Weekly newsletter bounced at major ISPs with `spf=permerror`. Root cause: 12 lookups from stacked includes and MX expansions. AutoSPF flattened includes, merged duplicates, and staged a `-all` rollout. Result: SPF permerrors dropped to zero; DMARC alignment rose from 61% to 97% in 10 days. **Case study B (E‑commerce, global)**: Forwarding to executives’ personal mailboxes caused intermittent SPF fails. AutoSPF detected lack of SRS on a partner forwarder, recommended relying on DKIM for **marketing mail and enabling SRS** for corporate aliases. Result: DMARC pass rate improved by 23%; false positives decreased significantly. ## FAQs ### Should I use \~all or -all at the end of my SPF record? Use `~all` (softfail) while auditing and onboarding senders; switch to `-all` (hardfail) only after AutoSPF (or your audit) confirms all legitimate sources pass. Pair with DMARC: it’s safer to enforce with DMARC once either SPF or DKIM is consistently aligned. ### Can I publish more than one SPF record for my domain? No. Publish exactly one `v=spf1` **TXT per DNS name**. If you need modularity, use redirect= to point to a base policy or delegate subdomains. [AutoSPF](https://autospf.com/) merges multiple records safely and sets up redirects. ### How do I know which include causes my lookup overflow? Expand each include with dig and sum a/mx/exist/redirect lookups, or let AutoSPF’s Lookup Budget report pinpoint the worst offenders and automatically flatten them. ![Mastering SPF Validation and Troubleshooting Email Bounces](https://media.mailhop.org/autospf/how-to-check-dmarc-record-9632-1781775868651.jpg) ### My vendor says “we sign DKIM”—do I still need SPF? If DKIM is aligned with your From domain and passes reliably, DMARC can pass without SPF. Still, it’s best to authorize vendor IPs in SPF when possible, especially for systems that evaluate **SPF independently of DMARC**. ### How long until SPF changes stop bouncing mail? _Plan for up to the highest TTL in your chain (often 15–60 minutes)_. Query multiple resolvers to confirm the new record is visible. AutoSPF tracks propagation and alerts when most major resolvers have converged. ## Conclusion: A repeatable playbook—automated with AutoSPF To resolve “SPF validation failed” bounces, follow a disciplined flow: validate the exact SPF TXT the receiver used, fix syntax, keep total DNS lookups ≤10, authorize every third‑party sender, test alignment under DMARC/DKIM, simulate recipient evaluation, account for TTL/propagation, and mitigate forwarding with SRS or DKIM. AutoSPF operationalizes this playbook: it lint‑checks changes pre‑publish, monitors and flattens includes to stay under the 10‑lookup limit, validates vendor authorization, **simulates receiver checks across regions**, highlights DMARC alignment issues, and tracks propagation. Adopt AutoSPF to transform SPF from a fragile text string into a governed, observable control that keeps your email delivered and your bounces down. ![Brad Slavin](https://media.mailhop.org/autospf/images/authors/brad-slavin.jpg) [ Brad Slavin ](/authors/brad-slavin/) General Manager Founder and 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/) ## 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 3m 3 points to consider before setting your SPF record to -all (HardFail) May 22, 2025 ](/blog/3-points-to-consider-before-setting-your-spf-record-hardfail/)[ Intermediate 3m 5 key contributors to the development of the Sender Policy Framework Nov 12, 2024 ](/blog/5-key-contributors-to-sender-policy-framework-development/) ```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":"What Troubleshooting Steps Should I Follow When I Receive An \"SPF Validation Failed\" Bounce Notification?","description":"Learn the key troubleshooting steps to identify and fix SPF validation failures, prevent email bounces, and improve email authentication and deliverability.","url":"https://autospf.com/blog/what-troubleshooting-steps-should-i-follow-when-spf-validation-failed/","datePublished":"2026-06-18T00:00:00.000Z","dateModified":"2026-06-18T00:00:00.000Z","dateCreated":"2026-06-18T00:00:00.000Z","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 founder and 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/what-troubleshooting-steps-should-i-follow-when-spf-validation-failed/"},"articleSection":"intermediate","keywords":"","image":{"@type":"ImageObject","url":"https://media.mailhop.org/autospf/office-365-spf-record-6319-1781775829459.jpg","caption":"SPF Validation Failed"},"speakable":{"@type":"SpeakableSpecification","cssSelector":[".answer-block","h1"]}},{"@context":"https://schema.org","@type":"FAQPage","mainEntity":[{"@type":"Question","name":"Should I use ~all or -all at the end of my SPF record?","acceptedAnswer":{"@type":"Answer","text":"Use `~all` (softfail) while auditing and onboarding senders; switch to `-all` (hardfail) only after AutoSPF (or your audit) confirms all legitimate sources pass. Pair with DMARC: it’s safer to enforce with DMARC once either SPF or DKIM is consistently aligned."}},{"@type":"Question","name":"Can I publish more than one SPF record for my domain?","acceptedAnswer":{"@type":"Answer","text":"No. Publish exactly one `v=spf1` **TXT per DNS name**. If you need modularity, use redirect= to point to a base policy or delegate subdomains. [AutoSPF](https://autospf.com/) merges multiple records safely and sets up redirects."}},{"@type":"Question","name":"How do I know which include causes my lookup overflow?","acceptedAnswer":{"@type":"Answer","text":"Expand each include with dig and sum a/mx/exist/redirect lookups, or let AutoSPF’s Lookup Budget report pinpoint the worst offenders and automatically flatten them."}},{"@type":"Question","name":"My vendor says “we sign DKIM”—do I still need SPF?","acceptedAnswer":{"@type":"Answer","text":"If DKIM is aligned with your From domain and passes reliably, DMARC can pass without SPF. Still, it’s best to authorize vendor IPs in SPF when possible, especially for systems that evaluate **SPF independently of DMARC**."}},{"@type":"Question","name":"How long until SPF changes stop bouncing mail?","acceptedAnswer":{"@type":"Answer","text":"*Plan for up to the highest TTL in your chain (often 15–60 minutes)*. Query multiple resolvers to confirm the new record is visible. 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