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    nex-cold-email-system-be

    by Ch1n4 G3nd4x

    A multi-tenant, state-machine driven cold email sending core with draft/test/live modes and full audit trails.

    Updated Jun 2026
    Security scanned

    $15

    · or 75 credits

    30-day refund guarantee

    Secure checkout via Stripe

    Included in download

    • Implement a fail-safe state machine for email campaign lifecycle management
    • Add a 'Test Mode' that redirects all outreach to an internal inbox
    • terminal, env_vars automation included
    • Instant install

    Sample input

    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.

    Sample output

    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.

    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.

    Use Cases

    • Implement a fail-safe state machine for email campaign lifecycle management
    • Add a 'Test Mode' that redirects all outreach to an internal inbox
    • Create a per-send audit trail for multi-tenant regulatory compliance
    • Prevent double-sending with automated idempotency keys for API requests

    Reviews

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    Security Scanned

    Passed automated security review

    Permissions

    Terminal / Shell
    Environment Variables

    Allowed Hosts

    keepachangelog.com
    semver.org
    nex-ai.be

    File Scopes

    assets/**
    references/**

    Tags

    python
    email-marketing
    resend
    saas-backend
    automation

    Creator

    Ch1n4 G3nd4x

    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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