You send an invoice, a quote or a follow-up, and the customer says they never got it. Later it turns up in their spam folder. When this happens repeatedly, the problem is often not what you wrote. It is whether receiving mail servers can confirm that your email really came from you.

Three technical records handle that confirmation: SPF, DKIM and DMARC. They live in your domain’s DNS settings, and setting them up correctly is one of the most effective ways to improve the delivery of your business email.

Why authentication matters now

Email was designed decades ago without a built-in way to prove who sent a message. Scammers take advantage of that by sending mail that pretends to come from real businesses. To fight back, mailbox providers check authentication records and treat unverified mail with suspicion.

Since 2024, Google and Yahoo have required bulk email senders to authenticate their mail with SPF, DKIM and DMARC and to offer easy one-click unsubscribe. Even if you do not send large volumes, these standards shape how all mail is judged. Properly authenticated mail simply has a better chance of reaching the inbox.

SPF: who is allowed to send

SPF, or Sender Policy Framework, is a DNS record that lists the servers and services allowed to send email for your domain. When a message arrives, the receiving server checks whether it came from a source on your list.

Common SPF problems include:

  • Missing services. Your email host is listed, but your newsletter platform, CRM, invoicing software or website form is not.
  • Multiple SPF records. A domain should have only one SPF record. Adding a second one instead of combining them breaks both.
  • Too many lookups. SPF has a limit on how many lookups it can perform, and long chains of includes can exceed it.

DKIM: a digital signature on every message

DKIM, or DomainKeys Identified Mail, adds an encrypted signature to each outgoing message. The matching public key is published in your DNS. Receiving servers use it to confirm the message was sent by an authorized system and was not altered along the way.

Each service that sends on your behalf usually needs its own DKIM setup. Your main mailbox provider, your marketing platform and your help desk tool may each give you a separate record to add. If a service offers DKIM signing for your domain, turn it on.

DMARC: the policy that ties it together

DMARC, or Domain-based Message Authentication, Reporting and Conformance, tells receiving servers what to do when a message fails SPF and DKIM checks and where to send reports about your domain’s mail. It also checks that the domain in the visible “From” address lines up with the authenticated domain.

DMARC policies come in three levels:

  1. None. Monitor only. Mail is delivered normally, and you receive reports.
  2. Quarantine. Failing mail is treated as suspicious, often sent to spam.
  3. Reject. Failing mail is refused.

Start with a monitoring policy, read the reports to find every legitimate service sending as your domain, fix those, and then tighten the policy step by step. Jumping straight to reject without that groundwork can block your own invoices and notifications.

Other reasons mail lands in spam

Authentication is the foundation, but it is not the only factor. Mailbox providers also consider:

  • Sending reputation. High complaint rates and bounces hurt future delivery.
  • List quality. Send only to people who asked to hear from you, and remove bad addresses.
  • Unsubscribe options. Marketing email should include a clear, easy way to opt out.
  • Content and links. Misleading subject lines and suspicious links raise flags.
  • Consistency. Sudden spikes in volume from a new domain can look suspicious.

A simple checklist to get started

  1. List every service that sends email using your domain, including forms and software notifications.
  2. Combine them into one correct SPF record.
  3. Enable DKIM for each sending service.
  4. Publish a DMARC record in monitoring mode and review the reports.
  5. Tighten DMARC once all legitimate mail passes.
  6. Recheck your records whenever you add a new email tool.

DNS changes are small, but a typo can stop mail entirely. If you are not comfortable editing records, get help. Our managed IT services through Service Your Devices include email and DNS administration, and our digital marketing team can make sure your campaign tools are authenticated before you send.

Make sure your messages arrive

Missed emails cost you replies, payments and trust. Getting SPF, DKIM and DMARC right will not guarantee inbox placement, but it removes one of the most common reasons legitimate business mail is filtered.

If customers keep finding your messages in spam, book a free consultation or call (772) 356-3550 and we will review your setup.

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