For over a decade, **Sendy** has been a beloved tool for developers and marketers who wanted to send newsletters via AWS SES at rock-bottom prices ($0.10 / 1,000 emails) without paying hundreds of dollars every month to Mailchimp.
However, Sendy was originally engineered in 2012. Over the last fourteen years, web architecture, security compliance, and email deliverability requirements have evolved drastically.
We built **Solidrix Send** to deliver everything developers loved about self-hosted email economics, re-imagined from the ground up for modern enterprise infrastructure.
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## Direct Architecture Comparison
| Feature | Legacy Sendy | Solidrix Send 2.0 |
|---|---|---|
| **Underlying Architecture** | Legacy procedural PHP / Apache / MySQL | Modern Laravel 11 / Redis / Sharded Queues |
| **Failover Support** | None (Single AWS SES account only) | **Multi-Provider Automatic Failover** (SES + Resend + Brevo) |
| **Spam / Anomaly Protection** | None (Raw dispatch directly to SES) | **Smart Airbag & Zero-Drop Quarantine Sandbox** |
| **API Architecture** | Basic form-encoded POST scripts | **RESTful JSON API with Scoped Production/Test Keys** |
| **Concurrency & Scaling** | Sequential cron jobs (slow dispatches) | **Multi-worker Redis queues with 10x batch chunking** |
| **Virtual SMTP Proxy** | Not available | **High-performance Port 587 Workerman ESMTP Proxy** |
| **Domain Authentication** | Optional shared tracking links | **Mandatory Custom Tracking Domain (CNAME) Isolation** |
| **Multi-Tenancy** | Basic brand lists without strict isolation | **Enterprise Multi-Tenant Isolation with TenantScopes** |
| **Suppression Management** | Basic local table without atomic caching | **Atomic Redis-backed global suppression engine** |
| **AI Optimization** | None | **Solaris AI Assistant for templates & subject scoring** |
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## Why Developers Are Migrating to Solidrix Send
### 1. Zero-Downtime Multi-Gateway Failover
Sendy can only speak to one AWS SES account. If your SES account hits its 24-hour quota, or AWS experiences a regional outage, your emails fail immediately. Solidrix Send connects AWS SES as primary, with automatic millisecond failover to Resend or your custom SMTP servers.
### 2. Protection Against Blacklisting (Smart Airbag)
If an unauthorized script generates 20,000 emails through Sendy, AWS SES will flag and terminate your SES account for high bounce or complaint rates. Solidrix Send's **Smart Airbag** trips automatically, quarantining the surge in a holding buffer before it ever reaches AWS.
### 3. Developer-First API & Port 587 SMTP Proxy
Sendy was built primarily as a web UI for marketing newsletters. Solidrix Send is a complete transactional and marketing email infrastructure, providing both a lightning-fast REST API and a Port 587 ESMTP proxy that plugs directly into Laravel, Django, Next.js, or WordPress.
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## Ready to Upgrade?
Migrating from Sendy to Solidrix Send takes less than 10 minutes. Export your subscriber CSVs, connect your AWS SES credentials, and experience the speed and safety of modern email resilience.
