Sending Emails for Global Products: Why You Should Use Resend Instead of Your Platform's Built-in SMTP

Email is practically infrastructure for any product targeting a global audience. User registration verification, payment receipts, password resets, newsletters down the road — none of it works without reliable email.

Yet a lot of people start out with their platform's built-in SMTP (Supabase's free tier, for example), which honestly has terrible deliverability — especially with Gmail, where messages frequently never arrive at all.

Recommended Solution: Resend

I recently switched to Resend and the experience has been refreshingly straightforward. The free tier gives you 3,000 emails per month, which is more than enough for an early-stage project.

Key Steps

1. Sign up for a Resend account
2. Connect a custom domain
3. Configure DKIM/SPF records (takes about 10 minutes)
4. Integrate it into your project

Once DKIM and SPF are properly configured, deliverability improves dramatically — your emails stop ending up in spam folders.

Community Tips

• On the receiving side, you can use Cloudflare to bind a custom domain
• Some people use Feishu's business email with a custom domain, which supports connecting multiple domains
• Lark's mail servers have a very clean reputation and almost never get flagged as spam

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Author: sitin | Original post