Zero-Downtime Migration from Sendy to Solidrix Send: The Complete Guide

Why High-Growth Teams Are Replacing Sendy in 2026

For more than a decade, Sendy served as the go-to script for budget-conscious marketers wanting to tap into AWS SES pricing ($0.10 per 1,000 emails). However, modern engineering standards have outpaced legacy PHP scripts that lack asynchronous concurrency, API resilience, and automated failover.

When you rely on legacy single-server email scripts, you face three critical vulnerabilities:

1. Zero Outage Protection: If AWS SES encounters an incident or temporarily pauses your sending quota, Sendy has no failover mechanism — your campaigns halt and scheduled transactional messages fail.
2. Database Lock Contention: Sendy executes synchronous MySQL table updates per dispatched email, leading to table locks when lists exceed 100,000 subscribers.
3. No Anomaly Circuit Breaker: If a marketer uploads a dirty list or an API key is compromised, there is no velocity brake to protect your AWS SES account from immediate suspension.

The 4-Step Migration Blueprint

Solidrix Send 2.0 was engineered to provide the exact same cost economics of AWS SES while introducing an enterprise-grade resilient routing layer. Here is how you can migrate in under 15 minutes with zero downtime:

Step 1: Export Your Clean Subscriber Lists

In your existing Sendy installation, navigate to your target brand, select Lists, and click Export CSV. Ensure you export both active subscribers and your legacy unsubscribes to preserve compliance history.

Step 2: Import into Solidrix Send

In your Solidrix Send dashboard:

1. Navigate to Lists → Create New List.
2. Upload your CSV export.
3. Map fields: Email, Name, and Custom Attributes.
4. Solidrix Send automatically cross-checks imported emails against your Redis-backed Global Suppression Engine.

Step 3: Transfer Your AWS SES Credentials & Add a Standby Gateway

Unlike Sendy, which locks you exclusively to AWS SES, Solidrix Send allows you to configure your primary AWS SES IAM credentials and immediately attach a secondary fallback provider (such as Resend, Brevo, or ZeptoMail):

Primary Gateway:   AWS SES (Priority 1)
Secondary Standby: Resend REST API (Priority 2, Automatic Failover)
Tertiary Standby:  Custom SMTP / ZeptoMail (Priority 3)

Step 4: Update Your Application Webhooks & SMTP Endpoints

If you were calling Sendy's subscribe API or using a custom script, swap your endpoint to Solidrix Send's REST API or point your server's ESMTP configuration to send.solidrix.com:587.

Comparison Summary

Ready to upgrade your delivery infrastructure? Create your Solidrix Send account and start routing resiliently today.