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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteBoth an email API and SMTP can send transactional welcome emails from a custom domain. Choose the integration that best fits your backend, authenticate the sending domain with your provider’s DNS records, and process bounce events so permanent failures are not sent to again. Neither an accepted message nor a delivery status proves it reached the recipient’s inbox.
Should my app use an email API or SMTP?
Use an HTTP API when your backend already makes authenticated HTTP requests or needs provider-specific request fields and status integrations. Use SMTP when your framework or an existing component expects an SMTP host and credentials. These are integration trade-offs, not evidence that one method delivers better. Cloudflare documents a Workers binding, REST API, and SMTP; Postmark documents API and SMTP sending options.
| Option | Good fit when | Provider examples in the documentation |
|---|---|---|
| HTTP API | Your backend is built around HTTP requests, or you want to use provider-specific request fields and integrations. | Cloudflare REST API; Postmark sending API. |
| SMTP | Your framework or mail component is already configured for an SMTP host and credentials. | Cloudflare SMTP; Postmark SMTP. |
| Platform-native binding | Your backend runs on a platform with a provider-supported native integration. | Cloudflare documents a Workers binding. |
For Cloudflare Workers, compare its native binding with REST and SMTP using the [Cloudflare sending documentation](https://developers.cloudflare.com/email-service/get-started/send-emails/). Cloudflare Email Service requires Cloudflare DNS for its service; the sender domain must also be onboarded on the account associated with the API token. Cloudflare says DNS propagation can take up to 24 hours and usually completes in 5–15 minutes for domains using Cloudflare DNS. That is its operational estimate, not a guarantee for every DNS provider or domain.
For Postmark, the developer overview identifies a transactional Message Stream for one-to-one messages triggered by a user action, including welcome messages, password resets, and order confirmations. Its documentation links to sending through the [API and SMTP, as well as bounce webhooks and suppressions](https://postmarkapp.com/developer/).
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Keep the provider behind an adapter
As an engineering choice, put provider-specific sending and event parsing behind an internal adapter. Your account-creation flow can then call one application-level operation, while the adapter handles the chosen API or SMTP configuration and translates provider events into your own statuses. This helps contain provider-specific behavior; it does not make providers interchangeable without additional work.
How do I send welcome emails from my own domain?
A welcome message sent after signup is a transactional email: it is triggered by an account action, rather than being a general newsletter. To send using your application’s brand domain, onboard that domain with the chosen email provider and publish the provider’s required DNS authentication records.
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- SPF authorizes sending infrastructure through DNS.
- DKIM adds a domain-associated signature to messages.
- DMARC lets the domain owner set policy and reporting around authentication and alignment.
Cloudflare’s [email authentication documentation](https://developers.cloudflare.com/email-service/concepts/email-authentication/) describes SPF for sending and routing, and says Email Service handles authentication after the dashboard-provided SPF, DKIM, and DMARC configuration is in place. Nylas likewise describes custom-domain sending as requiring the sender to publish and verify three DNS records. Its documentation distinguishes that approach from sending through a connected mailbox, which inherits authentication from the mailbox provider: [SPF, DKIM, and DMARC for email APIs](https://developer.nylas.com/docs/cookbook/email/spf-dkim-dmarc/).
Publish records without breaking existing policy
- Complete the selected provider’s domain-onboarding flow and obtain the exact DNS values it generates.
- Check the domain’s current SPF, DKIM, and DMARC records before making changes. Do not publish a second SPF record; if the provider requires an include mechanism, merge it into the existing SPF policy as directed by the provider and DNS administrator.
- Publish the required records and verify them through the provider’s onboarding process.
- Do not weaken an existing DMARC policy just to pass setup. Confirm the service’s record and alignment requirements with the provider and your DNS administrator.
Generic examples cannot replace the values generated for your account: record names and values are provider-specific. Cloudflare notes that propagation takes time in its [sending setup documentation](https://developers.cloudflare.com/email-service/get-started/send-emails/).
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How do I handle bounced welcome emails?
A bounce-safe flow records what the provider reports and uses permanent failures to stop future sends to an address that cannot receive mail. Treat temporary failures differently, and do not confuse an API’s acceptance or a delivery status with inbox placement.
- Trigger and validate. Create the welcome message after the relevant signup or account event, and validate the recipient address format.
- Send from the backend. Submit using a server-side credential; never expose API keys in browser or client code. For Cloudflare REST sending, the sender domain must be onboarded on the account that owns the API token.
- Record the initial response. Store the provider’s message identifier and response status. Acceptance or queueing means the provider accepted the request; it does not establish that the recipient saw the message in an inbox.
- Receive delivery events. Configure a provider webhook or use available message-status facilities. Postmark documents bounce webhooks and a suppressions API; Cloudflare documents bounce and suppression handling.
- Process events idempotently. Verify events using the selected provider’s documented authenticity mechanism, and store event IDs or equivalent deduplication state so duplicate notifications do not apply the same change repeatedly. Webhook verification details are provider-specific and should be taken from that provider’s webhook reference.
- Apply the right response. Suppress future sends after permanent failures until the address is corrected or reviewed. For temporary failures, follow provider retry guidance and cap retries rather than treating every failure as permanent. Cloudflare distinguishes hard and soft bounce concepts.
- Monitor trends. Watch bounce and complaint events. Investigate unexpected spikes before continuing normal sending; Cloudflare warns that high bounce rates and spam complaints can harm sending reputation in its [deliverability documentation](https://developers.cloudflare.com/email-service/concepts/deliverability/).
What should I compare before choosing a provider?
Compare documented capabilities against your application’s requirements; the following are decision criteria, not a scored provider benchmark.
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| Decision area | What to verify |
|---|---|
| Integration fit | Whether the backend needs an HTTP API, SMTP, or a platform-native binding. |
| Sender identity | Whether messages come from the application’s brand domain or a connected user mailbox. |
| DNS control | Whether your team can publish and maintain the provider’s SPF, DKIM, and DMARC records. |
| Bounce workflow | Whether webhooks, message-status information, and suppression controls support your needs. |
| Operational visibility | Whether you can inspect failures and distinguish permanent from temporary issues. |
| Portability | Whether sending and event parsing can be isolated behind an internal adapter. |
Provider documentation establishes available integration and event features, not comparative inbox placement. Cloudflare’s deliverability page lists suggested thresholds of more than 95% delivery rate, less than 2% hard bounce rate, and less than 0.1% complaint rate; the page does not identify a separate named study or year for those figures. Treat them as Cloudflare’s suggestions, not independently established industry benchmarks.
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