Email DNS — SPF, DKIM, and DMARC (Why Emails Go to Spam)
Configure the DNS records that authenticate your email and keep your messages out of spam folders.
You've built your application, set up a custom domain, and now you want to send email from it — account confirmations, password resets, invoices, notifications. You sign up for an email service like Resend, Sendgrid, or Postmark, write the code to send your first email, and... it lands in spam. Or worse, it doesn't arrive at all.
This is one of the most frustrating experiences in web development, and it almost always comes down to missing or misconfigured DNS records. Email authentication isn't optional anymore. Gmail, Outlook, and Yahoo all check for SPF, DKIM, and DMARC records. If you don't have them, your emails get flagged as suspicious.
Why Email Authentication Exists
Email was designed in the 1970s with no built-in authentication. Anyone can send an email claiming to be from
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