How to Set Up a Professional Email Address for Your UK Small Business: A Step-by-Step Guide

If you have decided you want a custom email domain, the setup splits into four clear steps. None are technically difficult, but step 3 (DNS records) is where most people get stuck. This guide walks through all four in order.

Step 1: Register your domain

Buy the domain you want to use for your email before you sign up for anything else.

A .co.uk domain costs £6 to £22 a year from a UK registrar (May 2026 prices). Use a UK registrar so support hours match your working day. Common UK choices include 123-Reg, Names.co.uk and Hostinger. Prices vary considerably, so check the renewal cost as well as the first-year price.

Two practical points before you click buy. Pick .co.uk over .com if your business is UK-only because UK customers trust .co.uk more readily. And pick a domain you can spell easily over the phone, because you will be spelling it to customers and suppliers for years.

Step 2: Choose and sign up for an email service

Choose the email provider that fits your budget and stack, then sign up for one mailbox to start.

For most small UK businesses the choice comes down to Microsoft 365 Business Basic at £5.75 per user per month or Google Workspace Business Starter at £5.90 per user per month (both ex VAT, May 2026). Our Workspace vs Microsoft 365 comparison covers the four things that decide it.

For cheaper options, IONOS, Namecheap and One.com start from around £10 to £20 a year for a single mailbox. Our ranked list of the cheapest professional email options covers seven providers from £7 a year upwards.

Sign up with the email service first, before adding any DNS records. The service gives you the exact records you need in step 3.

Step 3: Add your DNS records (the only fiddly bit)

Add four DNS records at your domain registrar so emails route correctly and reach inboxes rather than spam folders.

This step takes most people 20 minutes. Log into your domain registrar’s DNS panel, then add the records your email provider gives you.

MX (Mail Exchange) records. These tell the internet where to deliver email for your domain. Your provider supplies one or two MX records to add. Without these, emails to you@yourbusiness.co.uk go nowhere.

SPF record. A TXT record listing the servers allowed to send email from your domain. Stops other people pretending to send mail from you and keeps your messages out of spam.

DKIM record. A TXT or CNAME record providing a cryptographic signature on outgoing mail. Proves your emails are genuine to the receiving server.

DMARC record. A TXT record telling receiving servers what to do if SPF or DKIM fails. Since Google and Yahoo’s bulk sender rules came in during 2024, DMARC has gone from optional to expected.

If SPF and DKIM are unfamiliar, our explainer on SPF and DKIM for business email covers what they do and why every UK business needs them. DNS propagation can take up to 48 hours but is usually under 4.

Step 4: Verify the setup and test the mail flow

Send a test email to a personal account and check it arrives in the inbox, not the spam folder.

In the provider’s admin console, look for the MX, SPF and DKIM checks. Green ticks across all three mean the records are live. Red or amber means something has not propagated or is entered incorrectly.

Send a test email from your new domain to your personal Gmail or Outlook. Open it in Gmail, click the three dots, then “Show original”. You should see “PASS” next to SPF and DKIM. If you see “FAIL” or “NEUTRAL”, a record is wrong.

For test emails landing in spam, our diagnostic guide on why business emails go to spam covers the common causes and fixes. If everything looks clean, send a second test to a different domain (a friend, an accountant) to confirm.

One thing most setup guides will not flag at this stage: your wider website still needs to meet UK legal requirements. A privacy policy, cookie notice, terms and conditions, and the right business information in the footer. Email setup does not change that. Run your site through our free website compliance checker to see what is missing.

If you would rather not touch DNS at all

The four steps above are not technically difficult, but DNS records go wrong silently. If you would rather hand the technical side over, there is a route. Our pillar guide on whether a professional email is worth the bother covers the credibility argument behind doing this at all.

Duport’s website build starts from £360. Mention this article when you get in touch and we’ll honour the £144 rate. That covers a mobile-friendly site with the domain and mailbox set up and tested for you, live in 72 hours, with about 30 minutes of your time.

For those also registering a limited company, the full bundle is £244 upfront. That covers company formation, your website, email, and seven compliance tools together. Annual renewal is £94.

The setup we do is the same one described above. The difference is that someone else watches the DNS propagate.

FAQs

• How long does the whole setup take if I do it myself?

Allow an afternoon if you have done DNS before, or a weekend if it is your first time.

• Can I keep using Gmail to read mail sent to my custom domain?

Most professional email services let you forward custom-domain mail to a Gmail inbox so you have one place to read everything.

• Do I need a separate mailbox for each director or employee?

Each person needs their own mailbox, which is why per-user pricing matters as you grow; one is enough for a sole director.

• What if my emails go to spam after setup?

Check your SPF, DKIM and DMARC records are correct, and that your domain has not been used to send spam previously.

• Is my Wix or Squarespace website legally compliant in the UK?

Not automatically. UK law requires your website to include a privacy policy, a cookie notice, clear terms and conditions, and specific business information (such as your registered company name and number if you’re a limited company). Most website builders include template pages for some of these, but they don’t check whether your content is accurate or complete. Use our free website compliance checker to see what your site has and what it’s missing.

Rebecca