DNS (Domain Name Server) records are strings of text stored online in association with your domain registry. These records contain instructions to help internet browsers reach your website servers, and also provide authentication and instruction for services associated with your online activity (including email).
Domain registrars are regulated by the global system of Regional Internet Registries.
- What do DNS records do for Cortex?
- How do I create/edit/manage my DNS records?
- What DNS records do I need for Cortex?
- What about DMARC?
What do DNS records do for Cortex?
For your Cortex integration DNS records enable our click tracking and branded unsubscribe links, establish SPF and DKIM email authorization, and allow for DMARC policies. (Learn more about SPF, DKIM, and DMARC.)
How do I create/edit/manage my DNS records?
DNS records can be set and edited inside your provider's account with relative ease. Instructions for some popular providers are linked below:
|Important: Some DNS providers do not require the domain name (e.g. yourbrand.com) in the Host values below. For example, rs.yourbrand.com should be entered as rs when you add it to your DNS.
What DNS records do I need for Cortex?
You will need 5 CNAME records for your Cortex integration. Examples are shown below:
- rs.yourbrand.com - This enables our click tracking in emails.
- unsub.yourbrand.com - This enables unique unsubscribe links for your brand.
- resci1.yourbrand.com - This enables us to "sign" your emails as an authorized sender.
- ctct1 & ctct2._domainkey.yourbrand.com - These are your Domain Key Identifiers for DKIM validation.
Contact tech support if you do not know your domain key values.
What about DMARC?
DMARC is an optional record that sets policies for Mailbox Providers to follow if any message from an @yourdomain.com email does not pass SPF and DKIM authorizations.
These policies are designed to catch messages pretending to come from your brand (such as phishing attacks). DMARC records can contain varying levels of instruction ranging from "none" (do nothing) to "reject."
An example record is shown below:
|TXT||_dmarc||v=DMARC1; p=reject?; fo=1|
Most providers will use _dmarc, _dmarc.@, or _dmarc.yourbrand.com for the host.