01 · The Challenge
IDENTIFYING THE PROBLEM
Cold email outreach campaigns often suffer from low engagement due to generic messaging and poor domain reputation setups. The client needed a platform capable of scaling to thousands of personalized emails a day while avoiding spam filters and ensuring high inbox placement.
02 · Our Solution
ENGINEERING & CRAFT
Sitarahub engineered an intelligent mail routing pipeline. The system distributes campaigns across dozens of dynamic sender domains with automatic warm-ups and rotational delivery. It uses LLMs to scan prospect company websites and generate hyper-personalized intro lines, scheduling emails with randomized delays that replicate human sender behavior.
03 · Operational Impact
Key Results
Boosted cold email reply rates by 3x on average for B2B users.
Maintained a deliverability score of 98.4% across sender domain networks.
Auto-generated over 100,000 highly personalized emails with zero template feel.
04 · Technology Stack
Tech Stack Details
Next.jsExpress.jsOpenAI APIBullMQSMTP PoolTailwind CSSMongoDB