2026 B2B Email Decay & Catch-All Benchmark
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.
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 (%) | Billing Policy | Empirical Meaning & Actionable Routing |
|---|---|---|---|---|
| CATCH_ALL | 982 | 43.6% | Yes (1 credit) | 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% | Yes (1 credit) | Deliverable functional group inbox (support@, hello@, sales@, info@, partnerships@). Valid MX/SMTP mailbox, but shared across multiple team members. |
| INVALID-* | 411 | 18.2% | Yes (1 credit) | Definitive hard-bounce trap (550 5.1.1 User Unknown, disabled account, or non-existent MX). Sending to these addresses immediately damages domain reputation. |
| VALID | 324 | 14.4% | Yes (1 credit) | 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% | $0 (100% Refunded) | Transient 4xx server deferral or connection timeout. MailVeri automatically refunds 100% of credits for inconclusive results. |
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 ([email protected]), 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). |
How to Verify Executive Permutations Before Touching Your Sequencer
Guessing [email protected] or [email protected] 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.
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.
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 definitive check ($0 for UNKNOWN).
"""
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 2,185 definitive emails (with 68 UNKNOWN results automatically refunded 100%) costs just $0.65 total—compared to $14.18+ on legacy verifiers like ZeroBounce.