# Cold Mailer

> Cold Mailer (https://coldmailer.site) is an open, high-performance, privacy-first cold outreach dispatcher and global technology companies directory. Built on a Bring-Your-Own-Key (BYOK) architecture, it empowers job seekers, founders, and sales professionals to send personalized Markdown emails using their own SMTP, Gmail, Amazon SES, or Resend credentials with 0% vendor markup, automated deliverability throttling, and company-tailored resume attachments.

## Core Capabilities & Workflows
- [Markdown Email Dispatcher](https://coldmailer.site/send-multiple): Clean Markdown multi-email composer with frontmatter variables, live HTML previews, and instantaneous company personalization.
- [Bring-Your-Own-Key (BYOK) Architecture](https://coldmailer.site/settings): Connect private Gmail accounts (via App Passwords), custom SMTP servers, or transactional providers (Amazon SES, Resend, Brevo, SendGrid). Credentials remain encrypted with AES-256 and are never shared.
- [Company-Tailored Resume Attachments](https://coldmailer.site/profile): Upload and store multiple tailored CV variants, dynamically mapped to corresponding companies during bulk outreach.
- [Automated Deliverability & Anti-Spam Guard](https://coldmailer.site/anti-spam): Configurable inter-email batch delays (15s–120s) and daily volume thresholds to protect domain reputation and avoid spam filters.
- [Curated Companies Directory](https://coldmailer.site/companies): Searchable index of thousands of technology companies across major global hubs, featuring verified public talent inboxes, careers pages, tech stacks, and company sizes.
- [Real-Time Email Verification](https://coldmailer.site/companies): Integrated syntax validation, MX record lookup, and SMTP handshake checks to minimize bounce rates before dispatch.

## Top Tech Hubs & Hiring Directories
- [Tech Companies in Bengaluru, India](https://coldmailer.site/companies/IN/bengaluru): India's startup capital — enterprise SaaS, AI research labs, and product engineering teams.
- [Tech Companies in Hyderabad, India](https://coldmailer.site/companies/IN/hyderabad): Global capability centers (GCCs), cloud computing, and enterprise IT.
- [Tech Companies in Pune, India](https://coldmailer.site/companies/IN/pune): Product development, automotive tech, and software services.
- [Tech Companies in Delhi NCR, India](https://coldmailer.site/companies/IN/delhi-ncr): Consumer internet, fintech, and e-commerce leaders.
- [Tech Companies in Mumbai, India](https://coldmailer.site/companies/IN/mumbai): Banking technology, financial services, and media tech.
- [Tech Companies in San Francisco, US](https://coldmailer.site/companies/US/san-francisco): AI startups, venture-backed innovators, and Silicon Valley leaders.
- [Tech Companies in New York, US](https://coldmailer.site/companies/US/new-york): Fintech, healthtech, and media tech enterprises.
- [Tech Companies in Austin, US](https://coldmailer.site/companies/US/austin): Enterprise cloud, semiconductors, and B2B SaaS.
- [Tech Companies in Seattle, US](https://coldmailer.site/companies/US/seattle): Distributed systems, cloud infrastructure, and enterprise software.
- [Tech Companies in London, UK](https://coldmailer.site/companies/GB/london): Europe's premier tech hub — FinTech, AI research, and digital products.
- [Tech Companies in Berlin, Germany](https://coldmailer.site/companies/DE/berlin): Developer tooling, global SaaS, and e-commerce scale-ups.
- [Tech Companies in Toronto, Canada](https://coldmailer.site/companies/CA/toronto): Canada's largest tech corridor and AI research center.
- [Tech Companies in Singapore](https://coldmailer.site/companies/SG/singapore): Southeast Asia's fintech, web3, and enterprise hub.
- [Tech Companies in Dubai, UAE](https://coldmailer.site/companies/AE/dubai): Fast-growing MENA digital transformation and enterprise tech center.

## Policies & Best Practices
- [Directory Policy](https://coldmailer.site/directory-policy): Strict policy indexing only publicly available business contact points and talent portals. No private scraping or data resale.
- [Anti-Spam Policy & Deliverability Guide](https://coldmailer.site/anti-spam): Complete guide to CAN-SPAM compliance, warm-up schedules, spam avoidance, and respectful follow-up cadences.
- [Terms of Service](https://coldmailer.site/terms): User guidelines, BYOK acceptable use, and platform terms.
- [Privacy Policy](https://coldmailer.site/privacy): Data protection practices and zero-tracking commitment for outreach message bodies.

## Pricing & Access
- [Free Tier ($0 BYOK)](https://coldmailer.site/my-plan): Unlimited cold email dispatching using personal BYOK SMTP/Gmail credentials, basic company directory access.
- [Pro & Pro + AI Plans](https://coldmailer.site/my-plan): Advanced bulk verification, AI email generation allowances, priority dispatch queues, and unlimited directory exports.

## Optional & Comprehensive Documentation
- [Comprehensive Full Documentation](https://coldmailer.site/llms-full.txt): Complete documentation bundle including architecture, FAQs, deliverability guide, and full directory index.