Email Essentials
SPF, DKIM, and DMARC: A Careful Starting Point for Store Email
These DNS records help receiving systems evaluate mail identity, but publishing records is not a promise of inbox placement.
Store owners often encounter SPF, DKIM, and DMARC when configuring a support address or investigating why messages look suspicious. They are related tools for describing and checking email identity, but they are not interchangeable switches that guarantee delivery. A careful setup begins with understanding which systems send mail for your domain and asking the administrators of those systems for authoritative configuration details.
SPF is a DNS policy that identifies which sending hosts are authorized to send mail using a domain in the envelope sender identity. It is published as a TXT record. The important operational detail is that a domain should have one SPF policy, not a collection of separate SPF records that each claim to be complete. If your store uses a mailbox provider, a transactional mail service, and another platform that sends as your domain, their authorized sources need to be reconciled into the domain's policy. Do not copy an example record from a blog without confirming it matches your providers. An incomplete policy can cause legitimate sources to fail SPF checks; an overly broad policy can weaken the value of the check.
DKIM adds a cryptographic signature to outgoing messages. The sending system signs selected message content with a private key, and a receiving system can look up the matching public key in DNS using a selector and domain. This lets the receiver check whether the signed parts correspond to the published key and have remained intact in ways covered by the signature. The organization operating each sending system typically supplies the DNS record and enables signing on its service. If you use more than one sender, each may require its own selector and key. A DNS lookup can show whether a record is published, but publication alone does not confirm that messages are being signed correctly.
DMARC builds on SPF and DKIM by specifying how a receiving system should evaluate alignment between authenticated identities and the visible From domain. A DMARC record can also request reports, depending on the policy and reporting arrangements. Start by understanding your current senders and monitoring results before asking for a strict handling policy. Reports can reveal an overlooked source such as a store platform or a service that sends order notifications. Review them with someone who understands the domain's mail flows and the privacy implications of report data. A policy that rejects mail before all legitimate senders are understood can disrupt real business messages.
The practical first step is an inventory. List every service that sends mail using your domain or a branded From address: employee mailboxes, order notifications, marketing tools, support mail, and any external services. Confirm which domain each service uses for its envelope and visible From identity. Then ask each provider for its current SPF, DKIM, and DMARC guidance. Make DNS changes through the system authoritative for your domain, and keep a copy of the old record and the planned change so you can review or reverse a mistake.
MailBuddy uses your own mailbox provider. It can connect to that mailbox over IMAP for incoming mail and SMTP for sending, but DNS authentication is governed by the sending provider and your domain's DNS configuration. Ask the mailbox provider whether it signs mail with DKIM and which DNS records it expects. If other systems send store messages, account for them too. MailBuddy's DNS lookup can report records currently published for a domain; a lookup is not an assessment of recipient-specific filtering, message content, reputation, or eventual inbox placement.
After publishing changes, allow for DNS caching and verify the exact records from outside the editing interface. Send controlled test messages to accounts you operate at different providers and inspect the authentication results shown in the received message details. These tests offer clues, not a universal verdict: receivers apply their own systems and policies. Compare results with the sending provider's instructions, and check that messages from each authorized source are covered. Avoid sending large campaigns as a test.
The safest approach is incremental and documented. Keep access to domain DNS restricted, have a second person review high-impact changes, and avoid removing a record until you know which service depends on it. SPF, DKIM, and DMARC improve the information available for email authentication decisions. They do not guarantee that mail will be delivered, accepted, or placed in an inbox. Treat them as one part of a broader, provider-specific configuration, and investigate actual results rather than relying on a record checker alone.