The SaaS Founder's Guide to Choosing an Email Provider

Key Facts

Direct answer: The direct answer is that for most early-stage SaaS, Resend is the best choice: developer-friendly API, generous free tier (3,000 emails/month), good deliverability, and reasonable pricing ($20/month for 50,000 emails). For more on email, see our article on the SaaS founder's guide to email deliverability .
How to Choose: Choose Resend.
What to Look For: When choosing an email provider, consider.

Your SaaS needs to send emails: verification, password reset, welcome, billing, notifications. The email provider you choose affects deliverability (do emails reach the inbox?), cost (how much per email?), and developer experience (how easy is the API?). This article is the founder's guide to choosing the right email provider.

The direct answer is that for most early-stage SaaS, Resend is the best choice: developer-friendly API, generous free tier (3,000 emails/month), good deliverability, and reasonable pricing ($20/month for 50,000 emails). For more on email, see our article on the SaaS founder's guide to email deliverability.

The Top Email Providers

Resend

Free tier: 3,000 emails/month, 100 emails/day
Paid: $20/month for 50,000 emails
Deliverability: Good (uses AWS SES under the hood)
Developer experience: Excellent (clean API, React Email integration, SDK for Node.js, Python, Go)
Best for: Early-stage SaaS, developers who want a clean API

Postmark

Free tier: 100 emails/month (trial)
Paid: $15/month for 10,000 emails
Deliverability: Excellent (focused on transactional email, highest deliverability)
Developer experience: Good (clean API, detailed analytics)
Best for: SaaS where deliverability is critical (e.g., billing emails, verification emails)

SendGrid

Free tier: 100 emails/day (forever)
Paid: $19.95/month for 50,000 emails
Deliverability: Good (large provider, good reputation)
Developer experience: Good (mature API, large ecosystem)
Best for: SaaS that sends a lot of email (high volume), SaaS that needs marketing email alongside transactional

Mailgun

Free tier: 100 emails/day (first 3 months)
Paid: $15/month for 10,000 emails
Deliverability: Good (owned by Sinch, good reputation)
Developer experience: Good (clean API, good documentation)
Best for: SaaS that needs advanced features (routing, inbound email, validation)

AWS SES (Simple Email Service)

Free tier: 62,000 emails/month (only from EC2)
Paid: $0.10 per 1,000 emails
Deliverability: Variable (depends on your sender reputation)
Developer experience: Poor (AWS API, complex configuration)
Best for: High-volume SaaS (millions of emails), SaaS already on AWS

How to Choose

For early-stage SaaS (under 3,000 emails/month)

Choose Resend. The free tier (3,000 emails/month) covers most early-stage SaaS. The API is clean, the deliverability is good, and the React Email integration makes it easy to build beautiful emails.

For growth-stage SaaS (3,000-50,000 emails/month)

Choose Resend or SendGrid. Both cost $20/month for 50,000 emails. Resend has a better API; SendGrid has a larger ecosystem.

For deliverability-critical SaaS (billing, verification)

Choose Postmark. Postmark has the highest deliverability (because it is focused exclusively on transactional email), which ensures your billing and verification emails reach the inbox.

For high-volume SaaS (50,000+ emails/month)

Choose AWS SES. At $0.10 per 1,000 emails, SES is the cheapest for high volume. But you need to manage your sender reputation, which requires more work.

What to Look For

When choosing an email provider, consider:

Deliverability. Does the provider maintain a good sender reputation? (Resend, Postmark, and SendGrid all do.)
API. Is the API clean and well-documented? Can you integrate it in 10 minutes?
SDK. Does the provider have an SDK for your language (Node.js, Python, Go)?
Analytics. Can you track opens, clicks, bounces, and complaints?
Templates. Can you create email templates (HTML or React Email)?
Webhooks. Can you receive webhooks for bounces, complaints, and delivery events?
Pricing. Is the pricing transparent and predictable?

For more on email setup, see our article on the SaaS founder's guide to email deliverability.

Common Pitfalls and Troubleshooting

The first pitfall is sending email from your own server. Self-hosted email has poor deliverability because the server's IP address does not have a good sender reputation. The fix is to use an email provider.

The second pitfall is not setting up SPF, DKIM, and DMARC. Without these DNS records, email providers cannot verify your emails, which means they go to spam. The fix is to set up all three records. For more, see our article on the SaaS founder's guide to email deliverability.

The third pitfall is mixing transactional and marketing email. If marketing email gets flagged as spam, it can affect transactional email deliverability. The fix is to use separate subdomains (e.g., mail.myapp.com for marketing, app.myapp.com for transactional).

The fourth pitfall is not monitoring bounces and complaints. If your bounce rate is high, email providers will send your emails to spam. The fix is to monitor bounces and remove bounced addresses.

The fifth pitfall is choosing a provider based on price alone. The cheapest provider (AWS SES) requires the most work (managing sender reputation). The fix is to balance price with deliverability and developer experience.

Conclusion: Start with Resend, Switch When Needed

For most early-stage SaaS, Resend is the best email provider: clean API, generous free tier, good deliverability. Start with Resend, and switch to Postmark (for better deliverability) or AWS SES (for lower cost at high volume) when the product demands it. Do not send email from your own server — use a provider from day one.

Ready to choose an email provider? Sign up for Resend (free), set up SPF/DKIM/DMARC, and start sending. For more, see the SaaS founder's guide to email deliverability and the SaaS founder's guide to background jobs. Explore our free developer tools to speed up your workflow.