How to Send Trial Expiring Emails with Supabase
Learn how to send trial expiring emails from your Supabase application using AISend's AI-powered email API. This guide covers setup, implementation, and best practices for alerting users their trial is ending.
What are trial expiring emails?
Trial Expiring emails are transactional emails triggered by user actions, specifically for alerting users their trial is ending. These emails are critical to your application's user experience — if a trial expiring email doesn't arrive, users lose trust in your product. Trial Expiring emails typically have high open rates (60-80%) because recipients are expecting them. This makes deliverability especially important — you need an email API that ensures these messages reach the inbox, not the spam folder. AISend's AI-powered routing selects the best email provider for each recipient, maximizing inbox placement for your trial expiring emails.
Setting up AISend with Supabase
Start by creating a free AISend account at aisend.app — no credit card required. From your dashboard, create an API key. Install the AISend Node.js SDK: npm install aisend. The SDK provides TypeScript types and handles retries automatically. For production use, store your API key in environment variables — never hard-code credentials in your source code.
Sending trial expiring emails
To send a trial expiring email, make a POST request to the AISend API with four fields: from (your verified sending domain), to (the recipient's email), subject (a clear, descriptive subject line for your trial expiring email), and html (the email body). For trial expiring emails specifically, keep the content focused and actionable — include only the information the user needs for alerting users their trial is ending. Avoid promotional content in transactional emails as it can hurt deliverability and may violate anti-spam regulations. AISend's AI automatically scores your content for deliverability before sending.
Best practices for trial expiring emails in Supabase
Send trial expiring emails immediately when triggered — delays frustrate users, especially for time-sensitive emails like trial expiring. Use a background job queue to avoid blocking your application's response time. Include clear branding so users recognize your email. Keep subject lines descriptive and specific (e.g., "Your trial expiring from [AppName]"). Set up webhook handlers to track delivery status and handle bounces. Always include both HTML and plain text versions for accessibility. Use AISend's domain verification to set up SPF, DKIM, and DMARC for maximum deliverability.
Why use AISend for trial expiring emails?
AISend is built specifically for transactional emails like trial expiring notifications. AI-powered multi-provider routing ensures your emails reach the inbox by selecting the best provider (AWS SES, Postmark, or SMTP) for each recipient. Content scoring catches deliverability issues before they affect your sender reputation. And the API is designed to be developer-friendly — send your first email in under 5 minutes with the free tier (1,000 emails/month, no credit card required).
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