What is email deliverability?
Quick answer
Email deliverability is how reliably your messages land in recipients' inboxes rather than in spam or nowhere at all. It depends on proving the email really comes from your domain, on your sending history and on whether people want what you send.
Last updated
Updated · By Robert Breen
Why it matters for a small business
An email that lands in spam is almost the same as one never sent. The welcome email, the invoice reminder and the reply to a new lead only work if people see them. Deliverability problems are also quiet. Nothing bounces, the email just disappears into a folder nobody checks.
Three settings, added as records in your domain's DNS, prove your mail is genuine. SPF lists the servers allowed to send email for your domain. DKIM adds a digital signature to each message that receiving servers check against a public key you publish. DMARC tells receivers what to do when a message fails those checks, such as deliver it, send it to spam or reject it, and where to send reports. In 2024, Google and Yahoo began requiring people who send large volumes of email to their users to authenticate their mail, publish a DMARC policy, make unsubscribing easy and keep spam complaints low. Check their current sender guidelines for the details.
In a real lesson: Build a Lead Magnet Signup Form with an AI Welcome Email
In the AI Lead Magnet Signup Form lesson, every signup for Harbor & Pine Coffee Roasters, a made-up online coffee brand, gets a welcome email through n8n's Gmail Tool, with a link to The Better Cup at Home guide and a tip for the reader's segment. That email is only useful if it reaches the inbox.
The lesson is a practice copy and sends nothing, and it does not cover DNS settings. When you build it for real, the message goes out from the Google account you connected. If that account uses your own business domain, your email provider's setup guide explains how to add SPF, DKIM and DMARC records for it.
The lesson's system prompt also helps in a quieter way. It asks for "a short, warm welcome" with "No discounts and no health claims." Plain, honest messages that people asked for are less likely to be reported as spam, and complaints are one of the signals mailbox providers watch.
Try this lesson free or read the step-by-step guide.
Common confusions
Delivered vs delivered to the inbox
A "delivered" status often only means the receiving server accepted the message. It may still have gone to spam. Inbox placement is the part you actually care about.
SPF vs DKIM vs DMARC
SPF checks the sending server. DKIM checks a signature on the message. DMARC is the policy that ties them to your visible From domain and says what happens on failure. Most providers recommend all three.
Tips
- Ask whoever manages your domain to confirm SPF, DKIM and DMARC are set up before you send any campaign.
- Only email people who opted in, and make unsubscribing one click.
- Grow sending volume gradually from a new domain or address instead of starting with a big blast.
- Remove addresses that bounce and people who never engage.
Related terms
More Business terms
Where you use it: free lessons
- Build a Lead Magnet Signup Form with an AI Welcome Email (Lovable and n8n, 15 min)
- Build an AI Demo Request Form That Qualifies Leads (Lovable and n8n, 15 min)
Frequently asked questions
- How do I know if my emails go to spam?
- Send test messages to a few accounts at different providers and check where they land. Many email platforms also show bounce and complaint data, and DMARC reports show authentication failures.
- Do I need SPF, DKIM and DMARC for a small business?
- Yes, if you send from your own domain. They take little time to set up with your email provider's instructions, and they protect your domain from being spoofed by others.