Email Verification for B2B Lead Generation
Every invalid email in your CRM is an hour of SDR time wasted on a lead that will never convert. Verify at the source.
Why invalid leads are a revenue problem, not just a data problem
B2B lead generation relies on email as the primary channel. When a fraction of those emails are invalid, undeliverable, or role-based, the damage compounds across your entire funnel.
of B2B email addresses become invalid within 12 months
Industry estimate
SDRs spend time on leads they can never reach
An SDR who dials and emails a contact with an invalid address spends 20–30 minutes on a dead end. Multiply that by hundreds of leads per month and you have significant revenue capacity lost.
Bounce rates damage your sending domain
High bounce rates on outbound sequences trigger spam filters and domain reputation penalties. Once flagged, even your valid contacts stop receiving your emails.
CRM data degrades faster than you think
B2B email addresses decay at 22–30% per year. People change jobs, companies restructure. Without verification at import, your CRM accumulates dead weight.
Role-based emails never convert
info@, sales@, and contact@ addresses belong to shared inboxes. Nobody owns them and nobody acts on the emails. They inflate your list count without contributing to pipeline.
Verify at form submission and at CRM import
Mailbeam fits into two points in the B2B lead funnel: inline on the lead capture form, and in bulk when importing lists from events, purchased data, or scraped sources.
Real-time form validation
Verify emails as leads submit your contact or demo request form. Return an error before the lead hits your CRM — clean data at the source.
Batch import verification
Upload a CSV of event leads or a prospecting list export. Get back a scored file with valid, invalid, risky, and role-based flags in minutes.
Role-based email detection
Identify shared inbox addresses (info@, sales@, team@) and route them to a separate review queue instead of active sequences.
Catch-all domain scoring
Many enterprise domains accept all email — Mailbeam's AI model scores the likelihood that a catch-all address is monitored, so you can safely include high-confidence addresses in sequences.
Implementation
Copy-paste ready. Replace the API key and integrate with your existing flow.
import mailbeam
import csv
mb = mailbeam.Client(api_key=os.environ["MAILBEAM_KEY"])
def ingest_leads(csv_path: str) -> list[dict]:
valid_leads = []
with open(csv_path) as f:
for row in csv.DictReader(f):
result = mb.verify(row["email"])
if not result.valid:
continue
if result.role_based:
# Route to manual review, not sequence
row["_queue"] = "manual_review"
else:
row["_score"] = result.score
row["_queue"] = "active_sequence"
valid_leads.append(row)
return valid_leadsReal-world example
Leadframe (placeholder)
B2B SaaS sales tool
Challenge
Importing 5,000-lead lists from trade shows left SDRs with a 28% unreachable rate. Bounce rates on outbound sequences reached 18%.
Result
After adding Mailbeam verification at import, unreachable rate dropped to 4% and sequence bounce rates fell to under 2%.
Unreachable leads 28% → 4%
* Example based on anonymized customer data. Results may vary.
Recommended plan
Growth
B2B lead gen teams typically verify 10,000–100,000 leads per month across forms and batch imports. Growth plan covers this range with both real-time and batch endpoints.
Frequently asked questions
Ready to get started?
Free tier includes 1,000 verifications/month. No credit card required.