Resend

Resend sends the automatic emails your product produces, such as sign-in links, receipts and password resets. It suits a solo founder with a web app who needs those emails to arrive reliably. It is not a tool for newsletters or marketing campaigns.

On the maker's pricing page, the Free plan includes 3,000 emails a month, with a limit of 100 emails a day, 3 domains and 30-day data retention. Pro is listed at US$20 a month for 50,000 emails with no daily limit and 10 domains, and Scale at US$90 for 100,000. Our price above is converted to Australian dollars, so confirm it at checkout.

• Free: fine while you have a handful of users.
• Pro: when you hit the daily cap or send more than 3,000 emails a month.

• Add your domain and publish the DNS records Resend gives you, including SPF and DKIM.
• Create an API key and store it as a secret in your hosting tool, not in your code.
• Send a test email to yourself and to a second inbox from another provider.
• Check that your sign-in and receipt emails reach the inbox, not spam.

The daily cap on the free plan can block a sudden burst of sign-ups. Data is kept for 30 days. Transactional email still needs good practice: send only what a user expects, and keep the sending address consistent.

Postmark, Amazon SES and SendGrid are other ways to send app email. For newsletters and sequences, use an email tool such as Kit instead.

Resend sends the product emails in the Lean SaaS Founder stack.