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Mailgun, Amazon SES, Twilio SendGrid, and Postmark all document APIs for setting up or checking a sending domain; you do not need to use an SMTP relay just to manage domain verification. Your domain owner still has to publish the provider’s DNS records. “Without SMTP” can also mean sending application messages through HTTP rather than SMTP—this is a separate choice from domain setup and verification.
What “without SMTP relay” means
Domain creation, DNS-record retrieval, and verification are management tasks. A provider API can handle those tasks independently of the method your application uses to submit messages. If you mean sending over HTTP instead of to an SMTP endpoint, choose a provider API for message submission as well; the domain-verification APIs alone do not establish which transport your application will use.
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This distinction matters for Amazon SES: its documentation covers API-based identity verification, while SES also supports SMTP for sending. Using the verification API does not require SMTP for that management workflow, but it does not mean SES avoids SMTP in its sending system. See AWS’s documentation on verifying a domain identity and email authentication methods.
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| Provider | API workflow | DNS work you must arrange | Important qualification |
|---|---|---|---|
| Mailgun | The Domains API manages domains and exposes verification operations. | Mailgun lists SPF and DKIM TXT records. Tracking CNAME and inbound MX records apply to those additional features, not necessarily to sending authentication. | Mailgun says propagation can take 24–48 hours; that is its guidance, not a universal timing guarantee. See its Domains API and verification guide. |
| Amazon SES | SES supports domain identity verification through API calls and status queries such as GetEmailIdentity. | Publish TXT or CNAME records, depending on the identity and DKIM method selected. | Identity verification is distinct from the sending transport. See AWS identity verification. |
| Twilio SendGrid | The domain-authentication API documents domain creation and validation endpoints. | SendGrid documents three CNAME records with Automated Security enabled, or TXT and MX records when it is disabled. | Record requirements depend on configuration; check current account and feature requirements. See domain authentication creation and validation. |
| Postmark | The Domains API can create and list domains, return DNS and status fields, and request DKIM verification. | Publish the DKIM TXT record. A custom Return-Path uses an optional CNAME. | The SPF verification API is deprecated in the current reference. DKIMVerified means DKIM has ever been verified, not necessarily that DNS is healthy now. See the Domains API. |
This is a comparison of documented management capabilities, not a deliverability ranking. The cited documentation does not provide normalized current pricing or a like-for-like independent inbox-placement study.
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What the APIs automate—and what remains yours
Expect the provider API to create or identify a domain, return the required DNS values, and let your application request or inspect verification. The domain’s DNS host is a separate system: unless you separately configure DNS-provider access and automation, your team or domain owner must publish the records there. The reviewed provider documentation describes the provider supplying records, not silently changing your DNS.
- Create the domain or identity. Call the provider’s documented endpoint using an authorized API credential. For SendGrid, this is the domain authentication endpoint; SES supports identity operations described in its verification guide.
- Read the generated DNS requirements. Capture each record’s type, name or host, and value exactly as returned or shown by the provider. Requirements vary by provider and configuration.
- Publish records at your DNS host. Verify the zone and record names carefully. If the root domain already has an SPF record, integrate the provider’s authorization into the existing SPF policy rather than casually adding a second SPF TXT policy. Mailgun flags this issue in its setup guide.
- Request or poll verification. Use the provider’s verification or validation operation, then inspect the returned fields and any per-record status. A pending state may simply mean the provider cannot yet observe the published records.
- Recheck after DNS changes. Do not rely only on an old success flag; interpret the provider’s status semantics and, where appropriate, verify that the expected records remain present.
What SPF, DKIM, and DMARC each establish
- SPF is a DNS TXT policy identifying sending hosts authorized for an envelope domain.
- DKIM lets the sending service sign a message with a private key; the corresponding public key is published in DNS for verification.
- DMARC provides policy and reporting and evaluates whether SPF or DKIM authentication aligns with the visible From domain. AWS says DMARC compliance can be achieved through SPF or DKIM, while both are preferred for protection. Consult SendGrid’s authentication overview and AWS’s DMARC documentation.
These mechanisms are related but not interchangeable. A provider’s domain verification is a configuration signal that its checks can recognize required setup; it does not demonstrate that messages will reach inboxes.
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How to choose a provider for automated onboarding
Compare the workflow details that affect your integration rather than treating a green verification state as a deliverability score:
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- How API credentials and permissions are scoped, and whether your required account or region supports the feature.
- How many DNS records are required for your chosen configuration, including any optional tracking or custom Return-Path records.
- Whether DKIM key rotation and custom Return-Path configuration fit your operational needs.
- What each status field means, including whether it reflects current DNS or historical success.
- How your system handles DNS propagation, retries, timeouts, and incomplete setup.
Provider limits, endpoint behavior, pricing, and account requirements can change; check the current official API documentation before building against them. The available official sources do not establish which provider is cheapest or delivers the best inbox placement.
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