DNS changes feel scary because one wrong record can take down your website or your email. Updating DNS for HubSpot is mostly about adding a few specific records your registrar asks for — and the safe way to do it is to change only what HubSpot tells you to, leave everything else alone, and verify before you walk away. Done carefully, it's routine. Done carelessly, it's the kind of mistake that pages your whole company. Here's the practitioner's read on doing it without breaking anything.
What are DNS records, in plain terms?
DNS records are the instructions that tell the internet where to find your website and where to deliver your email for your domain. Think of DNS as your domain's address book. When someone visits your site or sends you mail, their system looks up your DNS records to know which server to talk to. The records you'll touch most are A and CNAME records (which point web traffic to the right place) and TXT, SPF, DKIM, and DMARC records (which prove your email is legitimate). You don't need to be a network engineer — you just need to know which record HubSpot wants and where to put it.
Why does HubSpot ask you to update DNS?
So it can host your pages on your own domain and send email that lands in inboxes instead of spam. When you connect a domain to HubSpot for your website or landing pages, HubSpot gives you a CNAME record to add so traffic to that domain reaches HubSpot's servers. When you set up email sending, it gives you authentication records — SPF, DKIM, and often DMARC — that tell mailbox providers your email is really from you. Worked example: skip the email authentication records and your perfectly good HubSpot emails start landing in spam, because providers can't verify you sent them.
How do you actually update a DNS record safely?
Log into your domain registrar, find the DNS settings, and add exactly the record HubSpot provides — host, type, and value — without editing unrelated records. The records live at whoever you bought the domain from, not in HubSpot. Copy HubSpot's record details precisely, including the host and value, and add a new record rather than overwriting one you don't recognize. Worked example: if your registrar nags you to "add a recommended preset" or "reset to defaults" while you're in there, ignore it — those bulk presets can overwrite the very records that keep your site and email working. Change only the one record you came to add, save, and back out.
What should you check after you change DNS?
Verify the record in HubSpot, confirm your site loads and email still flows, and remember changes take time to spread. After adding a record, use HubSpot's verification to confirm it sees the change, then test the real thing: visit the connected domain, send a test email, and make sure nothing that worked before is now broken. DNS changes propagate across the internet gradually, sometimes within minutes and sometimes over a day, so don't panic if verification doesn't pass instantly. This is the same order we follow with clients: change only what's needed, verify in HubSpot, then confirm site and email still work end to end before calling it done.
The IV-Lead take
DNS work is low-glamour and high-stakes: nobody notices when it's right, and everyone notices when it's wrong. The whole discipline comes down to restraint — add exactly the record HubSpot asks for, leave every other record untouched, refuse the registrar's "helpful" bulk presets, and verify before you walk away. The people who break their email aren't the ones who don't understand DNS; they're the ones who change more than they needed to. Touch one record, confirm it worked, and you'll be fine.
Connecting a domain or setting up HubSpot email and want a second pair of eyes? Book a 30-minute portal audit — we'll tell you straight which records to add and what to leave alone. For the bigger picture, see how we approach HubSpot implementation and optimization.
Frequently asked questions
Where do I actually change DNS records?
At your domain registrar — the company you bought the domain from — not inside HubSpot. HubSpot gives you the record to add; you add it in your registrar's DNS settings.
Will updating DNS break my website or email?
Not if you add only the specific record HubSpot provides and leave the rest alone. Problems happen when people overwrite unrelated records or accept a registrar's bulk "reset to defaults" prompt.
How long do DNS changes take to work?
Anywhere from a few minutes to about a day. Changes spread across the internet gradually, so if HubSpot's verification doesn't pass right away, give it time before assuming something's wrong.
Why does HubSpot need email authentication records?
SPF, DKIM, and DMARC records prove to mailbox providers that your email genuinely comes from you. Without them, your HubSpot emails are far more likely to land in spam.
