# 2026 B2B Email Decay & Catch-All Benchmark (610+ SaaS) | MailVeri > Empirical 2026 B2B email benchmark testing 2,253 executive emails across 610+ SaaS domains: 18.2% invalid bounce rate, 43.6% catch-all, and <2% bounce rules. - **Source**: https://mailveri.com/resources/b2b-email-decay-catch-all-benchmark - **AI Reference**: https://mailveri.com/llms-full.txt --- Original Empirical Research • October 2026 Dataset We verified **2,253 executive, founder, and functional email addresses** across **610+ B2B SaaS, Outbound Agency, and ESP domains**. We found that **18.2% (411 emails)** were hard-bounce `INVALID` traps and **43.6% (982 emails)** sat behind corporate `CATCH_ALL` servers. Sample Size 2,253 Emails across 610+ B2B companies Hard-Bounce Traps 18.2% 411 INVALID-* (550 5.1.1) caught Catch-All Density 43.6% 982 accept-all corporate MX Total Audit Cost <$0.68 At $299/1M tier ($0.000299/email) ## 1. Overall SMTP Status Distribution (n = 2,253 B2B Emails) Every candidate address was tested using live DNS MX resolution, disposable domain intelligence, role-account classification, catch-all canary checks, and non-intrusive `RCPT TO` handshakes (zero emails sent). | MailVeri Status | Count | Share (%) | Recommended Routing | Empirical Meaning & Actionable Routing | | --- | --- | --- | --- | --- | | CATCH_ALL | 982 | 43.6% | Throttled Warmup | Corporate mail server (Google Workspace, Microsoft 365, or custom gateway) accepts all incoming RCPT TO requests during handshake, masking whether individual executive mailboxes exist. | | ROLE_ACCOUNT | 468 | 20.8% | Fallback Sequence | Deliverable functional group inbox (support@, hello@, sales@, info@, partnerships@). Valid MX/SMTP mailbox, but shared across multiple team members. | | INVALID-* | 411 | 18.2% | Suppress Immediately | Definitive hard-bounce trap (550 5.1.1 Mailbox Not Found, disabled account, or non-existent MX). Sending to these addresses immediately damages domain reputation. | | VALID | 324 | 14.4% | Primary Sequence | Confirmed individual executive/founder mailbox (first@, first.last@) on a non-catch-all server that explicitly rejects invalid addresses and accepts the target inbox. | | UNKNOWN-* | 68 | 3.0% | Retry Later | Transient 4xx server deferral or connection timeout during the verification handshake. | ## 2. Breakdown Across 5 B2B Industry Sweeps (610+ Companies) Invalid hard-bounce rates and catch-all postures vary dramatically depending on whether you are prospecting enterprise SaaS vendors, outbound agencies, or indie PLG software founders. | Industry Sweep Cohort | Companies | Emails Tested | INVALID Caught | VALID Founders | Catch-All % | Key Deliverability Finding | | --- | --- | --- | --- | --- | --- | --- | | Sweep 1: Email Verifiers, Finders, Sequencers & Fraud Shields | 150 | 310 | 24 (7.7%) | 25 | 54.2% | Email infrastructure vendors maintain the highest catch-all and anti-enumeration posture in B2B SaaS to prevent competitor scraping. | | Sweep 2: Clay Studios, Cold Email Agencies & Enterprise SDR Agencies | 105+ | 358 | 40 (11.2%) | 41 | 41.9% | Outbound agencies keep primary corporate domains on Google Workspace with direct VALID founder inboxes (first@domain.com), while isolating cold outreach on secondary domains. | | Sweep 3: B2B Lead Databases, ESPs/SES Wrappers & AI Workflows | 115+ | 350 | 66 (18.9%) | 49 | 44.0% | Nearly 1 in 5 guessed executive permutations (ceo@, founder@, first.last@) hard-bounced with 550 5.1.1—well above AWS SES and Google Postmaster thresholds. | | Sweep 4: AppSumo LTD SaaS, Chrome Extensions, Ping-Post & Newsletters | 120 | 529 | 137 (25.9%) | 91 | 39.5% | Indie and PLG SaaS founders frequently provision only a single personal mailbox (first@) plus support@, causing 25.9% of standard executive role/pattern guesses to hard-bounce. | | Sweep 5: AI Recruiting/ATS, Shopify Email Apps, Webinars & Regional Champions | 120 | 706 | 144 (20.4%) | 118 | 42.6% | Regional B2B champions across Europe, Brazil/LatAm, and India/SEA yielded the highest absolute volume of verified direct executive mailboxes (118 VALID across 59 companies). | Automated Waterfall Routing ## How to Verify Executive Permutations Before Touching Your Sequencer Guessing `first@domain.com` or `ceo@domain.com` and pushing unverified leads straight into Instantly, Smartlead, or Amazon SES produces an average **18.2% hard-bounce rate**—more than 9x higher than the 2% safe deliverability ceiling. The Unit Economics of Pre-Verification Testing 4 candidate permutations per company across 1,000 target companies (4,000 checks) costs just **$1.20 total** on MailVeri’s $299/1M plan (or **$0.80** on the $999/5M wholesale plan)—saving your sending domains from blacklisting. [Claim 1,000 Free Credits](https://app.mailveri.com/accounts/signup/?utm_source=landing&utm_medium=benchmark_report&utm_campaign=b2b_decay_2026) · [Explore Wholesale API ($0.0002/check)](https://mailveri.com/wholesale-api) ```python import requests MAILVERI_API_KEY = "mv_live_your_api_key_here" def find_verified_executive_email(candidates: list[str]) -> dict: """ Verify candidate executive email permutations before adding to CRM or sequencer. Cost: $0.0002 to $0.00059 per check ($9/10K, $59/100K, $299/1M). """ response = requests.post( "https://app.mailveri.com/api/verify-mails/", headers={"Authorization": f"Bearer {MAILVERI_API_KEY}"}, json={"emails": candidates}, timeout=15, ) response.raise_for_status() results = response.json()["results"] # Priority 1: Direct VALID personal mailbox (99%+ deliverable) for item in results: if item["status"] == "VALID": return {"selected": item["email"], "tier": "DIRECT_VALID", "all": results} # Priority 2: Deliverable ROLE_ACCOUNT fallback (support@, hello@, partnerships@) for item in results: if item["status"] == "ROLE_ACCOUNT": return {"selected": item["email"], "tier": "ROLE_FALLBACK", "all": results} # Priority 3: Isolate CATCH_ALL for throttled secondary domain or LinkedIn outreach for item in results: if item["status"] == "CATCH_ALL": return {"selected": item["email"], "tier": "CATCH_ALL_THROTTLED", "all": results} return {"selected": None, "tier": "SUPPRESS_ALL_INVALID", "all": results} ``` ## Benchmark Methodology & Deliverability FAQs ### How was the 2026 B2B Email Decay & Catch-All Benchmark conducted? We analyzed 610+ active B2B companies across 17 SaaS, outbound agency, ESP, lead-generation, e-commerce, and regional software verticals in October 2026. For each company, we collected public contact addresses and standard executive naming permutations (first@, first.last@, founder@, ceo@, hello@, support@), totaling 2,253 candidate addresses, and verified every address via live MX and SMTP handshakes. ### Why did 18.2% of B2B executive email candidates return INVALID? B2B teams frequently change naming conventions (for example, using first@ instead of first.last@), deactivate departed co-founder mailboxes, or disable generic executive aliases like ceo@ and founder@ to stop cold spam. Without live SMTP verification prior to sending, an 18.2% hard-bounce rate will immediately trigger Google/Yahoo bulk sender blocks (>2%) and Amazon SES probation (>5%). ### How should outbound teams handle the 43.6% of B2B domains that are CATCH_ALL? Never mix unverified CATCH_ALL permutations into your primary sending campaign. Isolate CATCH_ALL records into a separate low-volume warmup sequence (capped at 10–15% of daily volume), cross-check Whether the prospect is active on LinkedIn, or fall back to a verified ROLE_ACCOUNT / web contact form when domain reputation is critical. ### How much did it cost to verify all 2,253 B2B emails on MailVeri? At MailVeri’s 1,000,000-credit tier ($299 for 1M credits = $0.000299/check), verifying the entire 2,253-email dataset costs under $0.68 total—compared to $14.18+ on legacy verifiers like ZeroBounce. ### Related B2B Deliverability & Catch-All Playbooks [Why Apollo “Verified” Emails Bounce → — How stale B2B database caches cause 15%+ bounce rates](https://mailveri.com/blog/why-apollo-verified-emails-still-bounce) · [Catch-All Emails Explained → — Isolating 43.6% corporate accept-all domains safely](https://mailveri.com/blog/catch-all-emails-explained) · [The 0.5% Post-Verification Floor → — Why same-week churn & content filters still happen](https://mailveri.com/blog/why-valid-emails-still-bounce-explained) Explore Resources & Tools: [Email List Hygiene Guide](https://mailveri.com/resources/email-list-hygiene-guide) · [Deliverability Checklist](https://mailveri.com/resources/email-deliverability-checklist) · [ROI Calculator](https://mailveri.com/resources/roi-calculator) · [Free Email Checker](https://mailveri.com/tools/email-checker) · [Pricing ($59 / 100K)](https://mailveri.com/pricing) · [Compare 36 Verifiers →](https://mailveri.com/compare) · [Glossary: Catch-All](https://mailveri.com/glossary/catch-all) · [Glossary: Valid Email](https://mailveri.com/glossary/valid-email) · [Glossary: 7 Statuses](https://mailveri.com/glossary/verification-result) · [Glossary: Role-Based Email](https://mailveri.com/glossary/role-based-email) ## Frequently Asked Questions ### How was the 2026 B2B Email Decay & Catch-All Benchmark conducted? We analyzed 610+ active B2B companies across 17 SaaS, outbound agency, ESP, lead-generation, e-commerce, and regional software verticals in October 2026. For each company, we collected public contact addresses and standard executive naming permutations (first@, first.last@, founder@, ceo@, hello@, support@), totaling 2,253 candidate addresses, and verified every address via live MX and SMTP handshakes. ### Why did 18.2% of B2B executive email candidates return INVALID? B2B teams frequently change naming conventions (for example, using first@ instead of first.last@), deactivate departed co-founder mailboxes, or disable generic executive aliases like ceo@ and founder@ to stop cold spam. Without live SMTP verification prior to sending, an 18.2% hard-bounce rate will immediately trigger Google/Yahoo bulk sender blocks (>2%) and Amazon SES probation (>5%). ### How should outbound teams handle the 43.6% of B2B domains that are CATCH_ALL? Never mix unverified CATCH_ALL permutations into your primary sending campaign. Isolate CATCH_ALL records into a separate low-volume warmup sequence (capped at 10–15% of daily volume), cross-check Whether the prospect is active on LinkedIn, or fall back to a verified ROLE_ACCOUNT / web contact form when domain reputation is critical. ### How much did it cost to verify all 2,253 B2B emails on MailVeri? At MailVeri’s 1,000,000-credit tier ($299 for 1M credits = $0.000299/check), verifying the entire 2,253-email dataset costs under $0.68 total—compared to $14.18+ on legacy verifiers like ZeroBounce.