How We Automated Email Marketing Outreach Using AI and Boosted Productivity 10X
How we delivered zero-compromise solutions for 3Zero Digital (Our Internal Project)
Location
Timeline
Services Provided
Problem / Goal
As our team at 3Zero Digital scaled outreach to potential leads and partners, manually crafting personalized emails became time-consuming and inconsistent. We wanted to automate this process while keeping the personalization intact — to boost engagement, save time, and maintain brand tone.
Solution / What We Did
We built an internal AI-powered cold email automation workflow using n8n, integrated with OpenRouter’s AI API, Google Sheets, and Gmail. Here’s what we implemented:
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Dynamic Personalization: Used Google Sheets to collect lead data (name, company, etc.).
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Prompt Engineering: Sent this data to OpenRouter’s Mixtral-8x7B model via API with custom prompts to generate context-aware, human-like cold emails.
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Attachment Handling: Embedded PDF case studies for social proof.
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Auto-Delivery: Used Gmail API to send the emails automatically, with proper headers and tracking.
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Error Handling: Added fallback checks to ensure valid responses and retry failed emails.
Tools & Tech Stack
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n8n (Self-hosted on private server for building automation workflows)
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OpenRouter AI API (Utilizing the Mixtral-8x7B model for personalized email content)
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Google Sheets (Used as the primary data source for contact and personalization fields)
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SMTP API (Zoho Mail) (For automated email delivery)
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PDF Handling Module (To attach dynamic case study PDFs in emails)
Results / Outcome
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60% reduction in manual work hours
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Consistent brand voice across all cold emails
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Open rate increased by 38% in the first 7 days
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Enabled outreach to 100+ prospects per week with no extra team effort
Client Testimonial
As a digital agency, we knew what needed to be done — but doing it for ourselves made all the difference. This internal system saved us time and made our outreach feel human at scale.”
— Nasrullah Rony, Co-founder & COO, 3Zero Digital