-90% Monitoring Time, Real-Time Issue Detection, 100% Client Retention
US Digital Marketing / Lead Generation Agency (40+ B2B Clients)
“We used to find out about deliverability problems when clients complained. Now we know before they do. The n8n automation runs 24/7, monitors everything, and alerts us instantly. It paid for itself in the first month by preventing a single client from churning over an inbox placement issue we caught early.”
— VP of Operations, US Digital Marketing Agency
The Background
A US-based digital marketing agency managing outbound email campaigns for 40+ B2B clients across SaaS, fintech, and professional services. The agency operates 500+ active sending domains and 2,000+ mailboxes for client campaigns.
| Team Size | Operations team (size not specified in source) |
|---|---|
| Volume | 500+ domains, 2,000+ mailboxes, 40+ clients |
| Engagement | Fixed-cost automation build + monthly retainer |
| Platform Access | Internal ops tool — demo available on request |
The Challenge
- Monitoring deliverability across 2,000+ mailboxes required 15+ hours/week of manual checking across Instantly, Mailreach, and spreadsheets.
- Deliverability issues were discovered reactively — often days after sender reputation damage had already occurred.
- No centralized view: domain health, inbox placement, and sender scores were scattered across 3 platforms.
- The ops team spent 8+ hours/week consolidating data into client-facing reports manually.
- One undetected deliverability drop could cost the agency $5K–$15K in client churn per affected account.
Our Approach & Technical Decisions
Foreignerds built an automated email deliverability monitoring system using n8n workflow orchestration that integrates Instantly, Mailreach, and Google Sheets into a unified, self-running operations pipeline.
- n8n for workflow orchestration — chosen over Zapier/Make for its self-hosted capability (data stays on client infrastructure), unlimited workflow executions, and superior error handling with retry logic.
- Instantly API for domain/mailbox retrieval — automatically fetches all active domains, mailboxes, and associated metadata with dynamic discovery of newly added accounts.
- Mailreach API for deliverability testing — initiates inbox placement tests, sender health assessments, and reputation scoring across all mailboxes simultaneously.
- Google Sheets for centralized reporting — auto-populated dashboards the ops team and clients already use daily, avoiding tool adoption friction.
- Automated alerting — critical deliverability drops trigger immediate email notifications, with priority categorization for fastest remediation.
Implementation Timeline
Technology Stack
Measurable Results
- Manual monitoring time reduced by 90%, from 15+ hours/week to under 1.5 hours.
- Deliverability issues now detected in real-time vs. previous 2-3 day discovery lag.
- Client reporting time reduced by 85% through automated Google Sheets dashboards.
- Zero client churn due to deliverability issues in the 6 months post-deployment (vs. 3 incidents in the prior 6 months).
- The system monitors all 2,000+ mailboxes daily without any manual intervention.
Post-Launch & Ongoing Engagement
The client signed a $2,200/month retainer for workflow maintenance, new client onboarding automation, and quarterly threshold reviews. The system has scaled from 2,000 to 3,200+ mailboxes with zero architecture changes.
