Klaviyo Setup

To connect a domain go to:
Organization Name -> Settings -> Domains -> Sending Domains -> Add Domain
Klaviyo secure email sender authentication relies on setting up a branded sending domain. This configures a dedicated subdomain on your DNS which aligns both SPF (via a custom Return-Path) and DKIM with your root domain.

Configure DNS Records

To complete the sending domain setup, Klaviyo requires you to configure four Nameserver (NS) records for your sending subdomain, along with a TXT record for verification.

Subdomain NS Records

Replace send with your chosen sending subdomain, and yourdomain.com with your root domain.

Record Type
NS (Name Server)
Host/Name
send.yourdomain.com
Value
n1.klaviyo.com n2.klaviyo.com, n3.klaviyo.com, and n4.klaviyo.com

Verification TXT Record

Record Type
TXT
Host/Name
yourdomain.com
Value
klaviyo-site-verification=abc123 (replace abc123 with your unique code from Klaviyo)
TTL
3600 seconds (1 hour)

Strict vs. Relaxed DMARC Alignment

Klaviyo relies on relaxed alignment in your DMARC configuration to pass authentication. When using a branded sending domain, emails are sent from a subdomain (e.g., send.yourdomain.com) while your from-address uses your root domain (e.g., yourdomain.com).
Because of this, you must ensure your DMARC record does not contain strict alignment tags (aspf=s or adkim=s).

Setup DMARC

Lastly we can setup DMARC. Again, verify you don't already have DMARC setup.
With basic monitoring, you will receive XML reports to the email address specified which will tell you how email is passing/failing authentication. These are very useful for debugging when email isn't being delivered.
Record Type
TXT
Host/Name
_dmarc.yourdomain.com
Value
v=DMARC1; p=none; rua=mailto:you@yourdomain.com
TTL
3600 seconds (1 hour)
Once setup, you can verify your records are configured correctly using our domain check tool:
Verify DNS records

Verification

Once you have created and saved these DNS records, navigate back to the Klaviyo Domains settings page and click Verify. Klaviyo will verify that the NS and verification TXT records are active, allowing you to successfully authenticate and scale your automated email workflows.

Reference