Email Verification Services | Hir Infotech

Client Background:
A Series B B2B SaaS company based in Austin providing sales intelligence software to mid-market US enterprises. Their outbound SDR team of 45 reps relied on a contact database of approximately 800,000 records built over four years through organic growth, purchased lists, and conference lead collection.

Challenge:
Hard bounce rates had climbed to 18.4% across their primary outbound email sequences, triggering deliverability flags from their ESP (Outreach). Google and Microsoft had begun routing their domain to spam folders — devastating open rates and directly impacting revenue pipeline. Their Head of Revenue Operations identified that the contact database had never undergone systematic verification, with no process for removing stale or invalid addresses.

Solution:
Hir Infotech performed a full-database verification of all 800,000 records using our AI-powered bulk email verification engine. The process included syntax validation, MX record checks, real-time SMTP handshake verification, spam trap detection, catch-all domain flagging, and AI risk scoring across all 14 parameters. Delivery was completed within 72 hours in structured CSV format, with full verification status codes for each record. Hir Infotech also implemented a real-time API integration with Outreach to validate all new contacts at point of import.

Results:

• Hard bounce rate reduced from 18.4% to 1.2% within 30 days
  
  
• ESP deliverability score improved from 61 to 94 (out of 100)
  
  
• Open rates increased by 41% across cold outbound sequences
  
  
• SDR team connected rate improved by 28% due to cleaner routing
  
  
• Estimated $340,000 in recovered pipeline attributed to deliverability improvement in Q1
  
  

Client Testimonial:
“We’d been flying blind with our contact data for years. Hir Infotech didn’t just clean our list — they rebuilt our confidence in our outbound motion. The API integration means we never import a bad contact again. Worth every dollar, multiple times over.”
— Head of Revenue Operations, B2B SaaS Platform, Austin TX

Client Background:
A UK-based B2B e-commerce marketplace connecting wholesale buyers and suppliers across 14 European countries. Their marketing team managed email campaigns to a database of 1.2 million registered business contacts across the UK, Germany, France, Italy, and Spain.

Challenge:
Following GDPR enforcement actions against two industry peers, their Data Protection Officer mandated a full audit of their email contact database. Beyond compliance, their email campaigns had deteriorating open rates (down 29% year-over-year) and their primary sending domain had received a spam classification warning from Microsoft’s SmartScreen. They needed a GDPR-compliant verification solution that could process their full database and integrate with their Mailchimp Enterprise account.

Solution:
Hir Infotech deployed a GDPR-compliant bulk verification workflow, processing all 1.2 million records under a signed Data Processing Agreement (DPA). Our European data processing infrastructure ensured no contact data left EU jurisdiction during verification. The process identified 340,000 invalid or high-risk records, including 18,000 known spam trap addresses and 67,000 catch-all domain contacts flagged for suppression. Results were delivered in Mailchimp-compatible suppression list format for immediate platform upload.

Results:

• 340,000 invalid records identified and suppressed (28.3% of database)
  
  
• Hard bounce rate dropped from 14.7% to 0.9%
  
  
• Mailchimp sender reputation score improved from “At Risk” to “Good” within 45 days
  
  
• Email campaign open rates recovered by 34% in first post-verification send
  
  
• DPO confirmed full GDPR compliance documentation for regulatory audit
  
  

Client Testimonial:
“The GDPR compliance piece was non-negotiable for us, and Hir Infotech handled it perfectly. Their European data infrastructure and the DPA gave our legal team full confidence. The deliverability recovery was the business outcome — but the compliance certainty was what made us choose them.”
— Head of Digital Marketing, B2B E-Commerce Platform, London

Client Background:
A Zurich-based B2B financial services technology company providing treasury management software to corporate finance teams across Switzerland, Austria, Germany, and the Netherlands. Their sales team ran targeted account-based outreach to CFOs and treasury directors at 250+ enterprise targets.

Challenge:
Despite a highly targeted ABM strategy, their email outreach to DACH-region decision-makers was generating hard bounces at 22% — well above the 2% industry threshold. Investigation revealed their 60,000-record contact database, sourced from industry directories and conference attendance, had not been verified in over two years. Their sending domain was approaching blacklist thresholds on Spamhaus, which would have catastrophically impacted their regulated communications.

Solution:
Hir Infotech deployed our enterprise email verification service with GDPR-compliant processing for the Swiss and EU data environment. Our team performed domain-level analysis of all DACH-region business email patterns, identified corporate catch-all configurations common among German and Swiss enterprise mail infrastructure, and applied manual review protocols for high-value ABM contacts flagged as uncertain. Hir Infotech also provided a detailed domain health report identifying three specific sending configuration issues contributing to blacklist risk.

Results:

• Hard bounce rate reduced from 22% to 1.4% across DACH outreach
  
  
• Domain removed from Spamhaus monitoring watchlist within 60 days
  
  
• ABM email reply rate increased from 2.1% to 6.8% following list cleanup
  
  
• Sales team booked 34% more discovery calls in the quarter following verification
  
  
• Full compliance documentation provided for Swiss FADP and EU GDPR requirements
  
  

Client Testimonial:
“In financial services, your domain reputation is as important as your company reputation. Hir Infotech understood the stakes in our regulated environment and delivered a verification process our compliance team trusted completely. The results speak for themselves.”
— VP Sales, Treasury Tech Company, Zurich

Client Background:
A Munich-based digital health B2B company providing practice management software to hospital groups, private clinics, and healthcare networks across Germany, Austria, and Switzerland. Their demand generation team used HubSpot for email nurture across a database of 95,000 healthcare provider contacts.

Challenge:
The company’s HubSpot account was flagged by Google Postmaster Tools for a sudden spike in spam reports, with their domain reputation classified as “Bad” — the lowest possible rating. Internal analysis revealed the database contained significant numbers of outdated medical practice email addresses, many linked to practices that had closed or changed ownership post-pandemic. Continued sending risked permanent domain blacklisting and would have disrupted patient-data-adjacent communications.

Solution:
Hir Infotech performed a full 95,000-record verification optimized for the healthcare sector’s unique email infrastructure, including practices with generic role-based addresses, hospital group domains with catch-all configurations, and multi-branch practice networks. Our healthcare-aware verification process applied sector-specific domain analysis for German Kassenärztliche Vereinigung (KV) affiliated domains and academic medical center email structures. Results were delivered in HubSpot-native import format with custom suppression segments.

Results:

• 31,400 invalid or high-risk records identified and suppressed
  
  
• Google Postmaster domain reputation recovered to “High” within 55 days
  
  
• HubSpot email send score improved from 48 to 91
  
  
• Lead nurture sequence open rate increased from 11% to 29%
  
  
• Company avoided estimated €80,000 in re-platform and domain migration costs
  
  

Client Testimonial:
“We were days away from having to migrate our entire sending domain — an enormous operational cost. Hir Infotech’s speed and healthcare domain expertise saved us from that scenario and genuinely transformed our marketing operation.”
— Head of Growth, Digital Health Platform, Munich

Client Background:
A Sydney-based B2B HR technology platform providing AI-driven recruitment tools to enterprise employers across Australia, New Zealand, and Southeast Asia. Their marketing team managed a 430,000-contact database of HR directors, talent acquisition leaders, and people operations professionals built through content marketing and partner lists.

Challenge:
Following a platform migration from Marketo to Salesforce Marketing Cloud, bounce processing errors had allowed approximately 80,000 previously-bounced addresses to re-enter the active mailing list. The result was a catastrophic deliverability collapse — their primary .com.au sending domain was blacklisted by Spamhaus, and major Australian ISPs (Telstra, Optus) were routing their emails directly to spam. Their Q3 product launch campaign reached fewer than 8% of intended recipients.

Solution:
Hir Infotech executed an emergency verification engagement, prioritizing immediate identification of the bounce-reactivated addresses and known spam trap records. Our team processed the full 430,000-record database within 48 hours, delivering prioritized suppression segments by risk tier. Hir Infotech also provided a platform migration audit identifying the Salesforce Marketing Cloud configuration error that had enabled bounce re-activation, along with technical remediation recommendations.

Results:

• 127,000 records suppressed across invalid, high-risk, and spam trap categories
  
  
• Spamhaus blacklisting removed within 21 days of suppression implementation
  
  
• Telstra and Optus routing normalized within 35 days
  
  
• Product launch re-send to verified list achieved 38% open rate (vs. 8% pre-verification)
  
  
• Q4 pipeline recovered by $1.2M AUD attributed to restored campaign deliverability
  
  

Client Testimonial:
“The emergency response from Hir Infotech was exceptional. Within 48 hours they had our data processed, the suppression lists ready, and a clear remediation roadmap. They didn’t just fix our list — they fixed the process that broke it.”
— VP Marketing Technology, HR SaaS Platform, Sydney

Client Background:
A Lyon-based B2B industrial components supplier serving procurement teams at manufacturing companies across France, Spain, Italy, and Belgium. Their inside sales team used a legacy email platform to manage outreach to 180,000 procurement and engineering contacts across Southern Europe.

Challenge:
Their email open rates had declined steadily from 24% to 7% over 18 months, and their inside sales team reported a significant increase in “email not found” responses from outbound sequences. An audit revealed their contact database was sourced primarily from trade directory scraping in 2021-2022, with no subsequent verification or hygiene process. The combination of B2B contact decay and domain configuration issues had severely compromised their outreach effectiveness.

Solution:
Hir Infotech performed a full bulk verification of all 180,000 records with specific attention to Southern European B2B email infrastructure — including Spanish (.es), Italian (.it), and French (.fr) corporate domain patterns. Our AI engine identified 58,000 invalid records and applied catch-all detection protocols for the high proportion of French and Spanish manufacturing domains using generic mail routing. Results were delivered in the client’s legacy platform format with full segmentation by verification status.

Results:

• 58,000 invalid records removed (32.2% of database)
  
  
• Email open rate recovered from 7% to 19% within two campaign cycles
  
  
• Inside sales team contact rate improved by 44%
  
  
• Marketing-sourced pipeline grew by 67% in the subsequent two quarters
  
  
• Zero spam complaints in first 90 days post-verification
  
  

Client Testimonial:
“We’d been sending to a ghost list for 18 months and didn’t know it. Hir Infotech gave us a verified, campaign-ready database and the open rates to prove it. The ROI was visible within the first campaign.”
— Sales Director, Industrial Components Supplier, Lyon