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Nex Cold Email System be
by Nex AI
A multi-tenant, state-machine driven cold email sending core with draft/test/live modes and full audit trails.
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See it in action
You say
Setup a cold email sending system for my FastAPI app. I need a safety mode to send to my own inbox first and I must have an audit log for every failure or success.
Your agent does
Generated cold-email-system/ folder:
- sender.py: Orchestrator with Draft/Test/Live modes.
- campaigns.py: SQLAlchemy models for EmailCampaign & EmailEvent.
- resend_client.py: Typed error handling + idempotency.
Sent state: [SENDING] -> [SENT] or [FAILED]. No orphaned campaigns.
What you get
About this skill
What it does
Nex Cold Email System BE is a production-ready sending core for cold-outreach platforms. It provides a robust backend orchestrator that handles the transition of email campaigns from 'approved' to 'sent' using Resend as the delivery provider. Built with a multi-tenant focus, it ensures your campaigns are never left in a 'half-sent' or orphaned state.
Why hit 'Buy' instead of prompting?
Building a cold email pipeline is more than just an API call. This skill implements a sophisticated state machine that handles the 'messy' side of email: transient failures, per-tenant mode switching, and mandatory audit trails. It prevents the primary nightmare of outreach—accidentally sending draft content to real prospects—through a hardcoded safety hierarchy (Draft > Test > Live).
Frameworks & Tools
- Python & FastAPI: Seamless integration into modern web backends.
- SQLAlchemy/PostgreSQL: Full relational schema for campaigns, prospects, and audit events.
- Resend: Direct integration through a typed client wrapper with idempotency support.
- Multi-Tenant Architecture: Ready-made for SaaS or agency use cases.
The Output
You receive a complete cold-email-system/ module including a state-machine orchestrator (sender.py), the relational data model (campaigns.py), and a resilient resend_client.py. Every send generates an EmailEvent, providing a forensic record of exactly who received what and when.
Built by Nex AI. More skills and info at nex-ai.be and slopsome.com.
How to install
Drop the file into your AI Agent. Works with Claude, Cursor, ChatGPT, and 20+ more.
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Creator
Founder of Nex AI. I build production-grade Claude Skills from systems that actually run: multi-tenant SaaS, Telegram agents, Raspberry Pi infrastructure, 3D multiplayer rooms. Every skill ships battle-tested patterns, not theory. 33+ open source skills published, commercial catalog growing.
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