> ## Documentation Index
> Fetch the complete documentation index at: https://docs.lettr.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Netlify

> Configure Netlify DNS for Lettr: add CNAME, DKIM, DMARC, and MX records to set up sending, inbound, tracking, and storage domains.

This guide walks you through adding the required DNS records for Lettr using Netlify's DNS management. Netlify is a platform for deploying and hosting web applications that also provides DNS hosting for domains connected to your Netlify account, managed through the [Netlify dashboard](https://app.netlify.com).

You will configure a **sending domain** (CNAME, DKIM TXT, and DMARC TXT records) and, optionally, an **inbound domain** (MX records), **tracking domain** (two CNAME records), and **storage domain** (CNAME and two TXT records).

***

## Sending Domain Setup

A sending domain authenticates your outgoing emails with DKIM and DMARC, ensuring they are delivered reliably and not marked as spam. This requires a CNAME record for domain verification, a TXT record for DKIM signing, and a TXT record for DMARC policy.

To create a sending domain in Lettr:

1. Select **Domains** in the navigation panel
2. Select **Sending Domains**
3. Click **Create Sending Domain**
4. Enter your desired sending subdomain (e.g. `mailing.company.com`)
5. Click **Create Domain**

<Tip>
  Use a subdomain (e.g. `mailing.company.com`) instead of the root domain (`company.com`). A subdomain provides proper
  reputation segmentation and is required if you also plan to receive emails with Lettr.
</Tip>

Click your new domain in the Sending Domains list.

This will display a list of DNS records that need to be configured. Keep this page open — you will need these values soon.

### Configure Netlify DNS

Netlify DNS is managed at the team level, not per site. Log in to the [Netlify dashboard](https://app.netlify.com) and select **DNS** from the left sidebar in your team dashboard. Select the domain you want to configure to open its DNS records panel.

<Tip>
  If your domain was purchased through Netlify or your nameservers already point to Netlify, skip nameserver
  configuration entirely. Your domain is already using Netlify's nameservers by default — proceed directly to adding the
  DNS records below.
</Tip>

<AccordionGroup>
  <Accordion title="Domain registered with a different registrar?">
    If you registered your domain elsewhere but want to manage DNS on Netlify, you must first add the domain to Netlify
    DNS and then **update the nameservers** at your registrar to Netlify's nameservers. Your domain's assigned
    nameservers are displayed in the **Name servers** panel on the domain's DNS page — they follow the format
    `dns1.p0X.nsone.net` through `dns4.p0X.nsone.net`, where the partition number is unique to your domain.

    <Warning>Until the nameservers are updated, any records you add in Netlify will not resolve.</Warning>
  </Accordion>
</AccordionGroup>

<Warning>
  If you have existing Netlify sites using subdomains that overlap with the subdomains you are configuring for Lettr
  (e.g. `mailing.company.com`), Netlify may have automatically created NETLIFY records for those subdomains. Remove
  or reconfigure those site assignments before adding the DNS records below.
</Warning>

### Add CNAME Record

The CNAME record verifies domain ownership with Lettr's email infrastructure.

Copy the CNAME values from Lettr to Netlify:

1. Click **Add new record** in the DNS records section.
2. Set **Type** to **CNAME**.
3. Copy the **Hostname** from Lettr and paste it into the **Name** field (without your domain suffix). For example, paste only `mailing`.
4. Copy the **Value** from Lettr and paste it into the **Value** field.
5. Click **Save**.

<Info>
  Netlify automatically appends your domain to the record name. Always paste only the subdomain portion (e.g.
  `mailing`, not `mailing.company.com`).
</Info>

### Add TXT Record (DKIM)

The DKIM record adds a cryptographic signature to your outgoing emails, allowing recipients to verify they were sent by an authorized sender.

Copy the TXT values from Lettr to Netlify:

1. Click **Add new record** in the DNS records section.
2. Set **Type** to **TXT**.
3. Copy the **Hostname** from Lettr and paste it into the **Name** field (without your domain suffix). For example, paste only `scph0126._domainkey.mailing`.
4. Copy the **Value** from Lettr and paste it into the **Value** field.
5. Click **Save**.

<Info>
  Netlify automatically appends your domain to the record name. Always paste only the subdomain portion (e.g.
  `scph0126._domainkey.mailing`, not `scph0126._domainkey.mailing.company.com`).
</Info>

### Add TXT Record (DMARC)

The DMARC record tells receiving mail servers how to handle emails that fail authentication checks, protecting your domain from spoofing.

Copy the TXT values from Lettr to Netlify:

1. Click **Add new record** in the DNS records section.
2. Set **Type** to **TXT**.
3. Copy the **Hostname** from Lettr and paste it into the **Name** field (without your domain suffix). For example, paste only `_dmarc.mailing`.
4. Copy the **Value** from Lettr and paste it into the **Value** field.
5. Click **Save**.

<Info>
  Netlify automatically appends your domain to the record name. Always paste only the subdomain portion (e.g.
  `_dmarc.mailing`, not `_dmarc.mailing.company.com`).
</Info>

### Verify Your Sending Domain

After adding all three DNS records, go back to Lettr and click **Verify DNS Records**. DNS propagation can take up to 24–48 hours, though it typically completes within a few hours on Netlify.

***

## Inbound Domain Setup

An inbound domain allows Lettr to receive emails on your behalf. This requires three MX records that direct incoming mail to Lettr's mail servers.

### Add Inbound Domain to Lettr

To create an Inbound domain in Lettr:

1. Select **Domains** in the navigation panel
2. Select **Inbound Domains**
3. Click **Create Inbound Domain**
4. Enter your desired inbound subdomain (e.g. `inbound.company.com`)
5. Click **Create Domain**.

Click on your new domain in the Inbound Domains list.

This will display the MX records that need to be configured.

### Add MX Records

MX records tell other mail servers where to deliver emails addressed to your domain.

Copy the MX values from Lettr to Netlify:

1. Click **Add new record** in the DNS records section.
2. Set **Type** to **MX**.
3. Copy the **Hostname** from Lettr and paste it into the **Name** field (without your domain suffix). For example, paste only `inbound`.
4. Copy the first **Required MX Record** value (e.g. `rx1.sparkpostmail.com`) from Lettr and paste it into the **Value** field.
5. Set **Priority** to `10`.
6. Click **Save**.
7. Repeat this process for the second (`rx2.sparkpostmail.com`) and third (`rx3.sparkpostmail.com`) MX records, each with priority `10`.

<Info>
  Netlify automatically appends your domain to the record name. Always paste only the subdomain portion (e.g.
  `inbound`, not `inbound.company.com`).
</Info>

<Warning>
  Adding MX records to a domain or subdomain will route all incoming email for that address to Lettr. Use a dedicated
  subdomain (e.g. `inbound.company.com`) to avoid affecting your primary email.
</Warning>

### Verify Your Inbound Domain

After adding all three MX records, go back to Lettr and click **Verify DNS Records**. DNS propagation can take up to 24–48 hours, though it typically completes within a few hours on Netlify.

***

## Tracking Domain Setup

A tracking domain allows Lettr to track email opens and link clicks using your own custom domain instead of the default Lettr tracking domain. This requires two CNAME records: one for the SSL certificate and one for routing tracking traffic to Lettr's infrastructure.

### Add Tracking Domain to Lettr

To create a Tracking domain in Lettr:

1. Select **Domains** in the navigation panel
2. Select **Tracking Domains**
3. Click **Create Tracking Domain**
4. Enter your desired tracking subdomain (e.g. `tracking.company.com`)
5. Click **Create Domain**

Click on your new domain in the Tracking Domains list.

This will display the CNAME records that need to be configured.

### Add SSL Certificate CNAME Record

The SSL Certificate CNAME record provisions an SSL certificate for your custom tracking domain, enabling secure HTTPS connections for tracked links.

Add the record in Netlify:

1. Click **Add new record** in the DNS records section.
2. Set **Type** to **CNAME**.
3. Copy the **Hostname** from Lettr and paste it into the **Name** field (without your domain suffix).
4. Copy the **Value** from Lettr and paste it into the **Value** field.
5. Click **Save**.

<Info>
  Netlify automatically appends your domain to the record name. Always paste only the subdomain portion (e.g.
  `tracking`, not `tracking.company.com`).
</Info>

### Add Traffic CNAME Record

The Traffic CNAME record routes click and open tracking requests from your custom domain to Lettr's tracking servers.

Add the record in Netlify:

1. Click **Add new record** in the DNS records section.
2. Set **Type** to **CNAME**.
3. Copy the **Hostname** from Lettr and paste it into the **Name** field (without your domain suffix).
4. Copy the **Value** from Lettr and paste it into the **Value** field.
5. Click **Save**.

<Info>
  Netlify automatically appends your domain to the record name. Always paste only the subdomain portion (e.g.
  `tracking`, not `tracking.company.com`).
</Info>

### Verify Your Tracking Domain

After adding both CNAME records, go back to Lettr and click **Verify DNS Records**.

***

## Storage Domain Setup

A storage domain lets you serve email assets (images, attachments) from your own custom domain instead of the default Lettr storage URL. This requires two TXT records for certificate validation and ownership verification, and a CNAME record for routing asset requests to Lettr's storage infrastructure.

### Add Storage Domain to Lettr

To create a Storage domain in Lettr:

1. Select **Domains** in the navigation panel
2. Select **Storage Domains**
3. Click **Create Storage Domain**
4. Enter your desired storage subdomain (e.g. `assets.company.com`)
5. Click **Create Domain**

Click on your new domain in the Storage Domains list.

This will display the TXT and CNAME records that need to be configured.

### Add TXT Record (Certificate Validation)

The Certificate Validation TXT record provisions an SSL certificate for your custom storage domain, enabling secure HTTPS delivery of email assets.

Add the record in Netlify:

1. Click **Add new record** in the DNS records section.
2. Set **Type** to **TXT**.
3. Copy the **Hostname** from Lettr and paste it into the **Name** field (without your domain suffix).
4. Copy the **Value** from Lettr and paste it into the **Value** field.
5. Click **Save**.

<Info>
  Netlify automatically appends your domain to the record name. Always paste only the subdomain portion (e.g.
  `assets`, not `assets.company.com`).
</Info>

### Add TXT Record (Hostname Pre-validation)

The Hostname Pre-validation TXT record verifies ownership of the storage domain before Lettr provisions a custom hostname for it.

Add the record in Netlify:

1. Click **Add new record** in the DNS records section.
2. Set **Type** to **TXT**.
3. Copy the **Hostname** from Lettr and paste it into the **Name** field (without your domain suffix).
4. Copy the **Value** from Lettr and paste it into the **Value** field.
5. Click **Save**.

<Info>
  Netlify automatically appends your domain to the record name. Always paste only the subdomain portion (e.g.
  `assets`, not `assets.company.com`).
</Info>

### Add CNAME Record (Domain Routing)

The Domain Routing CNAME record routes asset requests from your custom domain to Lettr's storage infrastructure.

Add the record in Netlify:

1. Click **Add new record** in the DNS records section.
2. Set **Type** to **CNAME**.
3. Copy the **Hostname** from Lettr and paste it into the **Name** field (without your domain suffix).
4. Copy the **Value** from Lettr and paste it into the **Value** field.
5. Click **Save**.

<Info>
  Netlify automatically appends your domain to the record name. Always paste only the subdomain portion (e.g.
  `assets`, not `assets.company.com`).
</Info>

### Verify Your Storage Domain

After adding all three records, go back to Lettr and click **Verify DNS Records**.

***

## Troubleshooting

<AccordionGroup>
  <Accordion title="Domain Suffix Not Omitted">
    Netlify automatically appends your domain to the record name. If you paste the full hostname (e.g.
    `mailing.company.com`), the resulting record will resolve as `mailing.company.com.company.com`, which will fail
    verification.

    Always paste only the subdomain portion (e.g. `mailing`, `scph0126._domainkey.mailing`, `_dmarc.mailing`).
  </Accordion>

  <Accordion title="Subdomain Conflicts with Netlify Site">
    When you assign a domain to a Netlify site, Netlify automatically creates proprietary NETLIFY or NETLIFYv6 records
    for that subdomain. If a subdomain you want to use for Lettr (e.g. `mailing.company.com`) is already assigned to a
    Netlify site, you may need to disconnect the site from that domain before adding DNS records for Lettr. Remove the
    site assignment first, or use a different subdomain.
  </Accordion>

  <Accordion title="Records Not Propagating">
    DNS propagation on Netlify typically takes a few hours, but can occasionally take longer. If verification fails
    after adding records, check the following:

    * **Wait at least 30 minutes** before your first verification attempt.
    * **Confirm the records exist** using command-line tools:

    ```bash theme={null}
    # Check CNAME record
    dig CNAME mailing.yourdomain.com +short

    # Check DKIM record
    dig TXT scph0126._domainkey.mailing.yourdomain.com +short

    # Check DMARC record
    dig TXT _dmarc.mailing.yourdomain.com +short

    # Check MX records (inbound)
    dig MX inbound.yourdomain.com +short

    # Check tracking domain CNAME
    dig CNAME track.yourdomain.com +short

    # Check storage domain CNAME
    dig CNAME assets.yourdomain.com +short
    ```

    * **Use a web tool** like [dnschecker.org](https://dnschecker.org) to verify propagation across multiple DNS servers worldwide.
  </Accordion>

  <Accordion title="Wrong Record Type">
    A common mistake is selecting the wrong record type:

    | Record                          | Correct Type |
    | ------------------------------- | ------------ |
    | Sending verification            | CNAME        |
    | DKIM                            | TXT          |
    | DMARC                           | TXT          |
    | Inbound mail                    | MX           |
    | Tracking SSL certificate        | CNAME        |
    | Tracking traffic                | CNAME        |
    | Storage certificate validation  | TXT          |
    | Storage hostname pre-validation | TXT          |
    | Storage domain routing          | CNAME        |
  </Accordion>

  <Accordion title="DKIM Value Truncated">
    The DKIM TXT value is a long string. After saving the record, click on it in the DNS records list to confirm the
    full value was stored. If it appears truncated, note that Netlify does not support in-place record editing — add
    a new record with the correct full value, then delete the old one.
  </Accordion>

  <Accordion title="Nameservers Not Pointing to Netlify">
    If your records are saved in Netlify but not resolving, confirm that your domain registrar is pointing to
    Netlify's nameservers. You can check this with:

    ```bash theme={null}
    dig NS yourdomain.com +short
    ```

    The output should include Netlify's nameservers in the format `dns1.p0X.nsone.net` through `dns4.p0X.nsone.net`.
    Your domain's exact nameservers are shown in the **Name servers** panel on the domain's DNS page in the Netlify
    dashboard. If the output shows a different provider's nameservers, update them at your domain registrar.
  </Accordion>

  <Accordion title="When to Contact Support">
    If your DNS records are correctly configured (confirmed with `dig` or dnschecker.org) and verification still fails
    after 48 hours, contact Lettr support at **[support@lettr.com](mailto:support@lettr.com)** or through the in-app chat. Include your domain
    name and the output of the `dig` commands above.
  </Accordion>
</AccordionGroup>

***

## Related Topics

<CardGroup cols={2}>
  <Card title="Sending Domains" icon="paper-plane" href="/learn/domains/sending-domains">
    Learn about sending domain setup, SPF, DKIM, and DMARC.
  </Card>

  <Card title="Inbound Domains" icon="inbox" href="/learn/domains/inbound-domains">
    Configure MX records to receive emails with Lettr.
  </Card>

  <Card title="Tracking Domains" icon="link" href="/learn/domains/tracking-domains">
    Set up a custom tracking domain for click and open tracking.
  </Card>

  <Card title="Storage Domains" icon="hard-drive" href="/learn/domains/storage-domains">
    Serve email assets from your own custom domain.
  </Card>

  <Card title="Domains Overview" icon="globe" href="/learn/domains/introduction">
    Understand domain types and how they work in Lettr.
  </Card>

  <Card title="Domain Verification Failures" icon="circle-exclamation" href="/knowledge-base/troubleshooting/domain-verification">
    Troubleshoot common DNS configuration and propagation issues.
  </Card>
</CardGroup>