Types of Email Your App Sends
Web apps send email constantly: verification links, password resets, receipts, notifications and newsletters. Getting it into inboxes reliably is a skill of its own.
Two kinds of email
| Transactional | Marketing / bulk | |
|---|---|---|
| Triggered by | a user action (sign-up, purchase) | you (campaigns, newsletters) |
| Examples | verify email, reset password, receipt | product updates, promotions |
| Consent | expected as part of the service | needs opt-in and an unsubscribe link |
| Urgency | seconds matter | can be scheduled |
Keep them separate (different subdomains or streams), so a marketing complaint spike never delays password resets.
Use an email provider
Do not send directly from your web server: new servers have no reputation, and port 25 is often blocked. Use a provider with an API:
| Provider | Known for |
|---|---|
| Resend | developer-friendly API, React/HTML emails |
| Postmark | fast, highly reliable transactional delivery |
| SendGrid / Mailgun / Amazon SES | high volume, lower cost at scale |
| Mailchimp / Buttondown / ConvertKit | newsletters and marketing |
Compare free tiers, price per thousand emails, deliverability tools and whether marketing sending is allowed on the plan.
What you need before sending
- A domain you control (send from a subdomain such as
mail.yourdomain.com). - SPF, DKIM and DMARC records (see Domains & DNS).
- An API key stored as an environment variable.
- A real "from" address, and a monitored reply-to address.
Check yourself
- Why separate transactional and marketing email?
- Why not send email directly from your web server?
- What DNS records are required before sending?
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