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Update your email domain settings to comply with the new Google & Yahoo! requirements
Update your email domain settings to comply with the new Google & Yahoo! requirements

Protect against spoofing & phishing, and help prevent messages from being marked as spam.

Updated over a week ago

⚠️ Important: Gmail and Yahoo! have implemented new email sending requirements for branded email addresses.

To ensure uninterrupted communication with your customers, you must update your DMARC records by April 1st, 2024.

If no action is taken by April 1st, your sender email domain will be automatically changed to '[email protected]' to meet minimum deliverability requirements.


Before you start

These instructions below are for updating your authenticated sender domain's DMARC settings. Please read the following:

  • If you haven't added your sender email domain in your Marsello admin, e.g. your Marsello email campaigns are sending using emails '[email protected]' please follow this guide to set up your store's domain first.
    If you need to update your sender domain email address, follow this guide.

  • If you haven't authenticated your sender domain, this is important to help prevent your email messages from being marked as spam and ensures their successful delivery to your customers. You need to have added the following records to your sender domain settings:

    • CNAME record

      • SPF record

      • DKIM record

    To authenticate your sender domain, follow this guide.
    Please note that changes to your CNAME records may take 24 hours to take effect.

    If unknown, please check your sender domain settings in Marsello admin.
    E.g. an authenticated sender domain will look like this:


Configure your DMARC policy (via your domain provider)

DMARC (Domain-based Message Authentication, Reporting, and Conformance) is an email authentication protocol designed to enhance the security of email domain owners by mitigating email spoofing and unauthorized use of their domain.

When configuring a DMARC record, it allows inbox providers to determine how to handle emails originating from your domain that do not pass SPF and DKIM checks. Additionally, DMARC provides a reporting mechanism for domain owners to gain insights into how frequently recipient servers worldwide receive emails from their domain, along with the percentage properly authenticated.

⚠️ Important: The below is a technical process, please reach out to your IT administrator or DNS settings manager for assistance if you are unsure.

📝 Kindly note: Marsello Support cannot assist with this change as it needs to be updated solely in your email domain provider.

How to create your DMARC Policy:

  1. Open your email domain provider

  2. Navigate to your DNS provider settings

  3. Next to Type select TXT record

  4. In the Name field, enter _dmarc. followed by your complete domain name.

    For example: If your domain name is redboutique.com,
    Enter: _dmarc.redboutique.com

  5. Add the "Value" information

  • Minimum requirement: To meet the minimum requirement for the DMARC Policy, you'll need to include both v: & p: values.

    You can copy and past these recommended values:
    v=DMARC1; p=quarantine;

🤔 What do these values mean?

  • v: indicates the DMARC version.

  • p: is the policy type that dictates the action for non-passing emails.
    Options include:

    • none: Collect feedback and gain visibility into email streams without affecting existing flows.

    • quarantine: Filter non-passing emails into the recipient's quarantine. (recommended)

    • reject: Bounce non-passing emails.

Extra for experts: You can also add these values information however the v: & p: values are all you need to meet the minimum requirements.

  • sp: Apply a policy to a subdomain of the DMARC record.

  • pct: Percentage of total unique sends that failed authentication to apply the policy to. For instance, if your DMARC record includes p=reject; pct=25, and 100 emails fail authentication, only 25 will be bounced, while the remaining 75 will be delivered to recipients. Defining this property helps gradually implement your authentication policy to ensure it functions as intended. Note that certain inbox service providers may ignore this parameter.

  • ruf & rua: Optional parameters specifying an email address to send DMARC reporting data to, provided in URI mailto format (e.g., mailto:[email protected]). Reporting data sent varies based on the parameter

  • rua: Aggregate report of all your domain traffic.

  • ruf: Failure reporting data, including redacted copies of individual messages that failed authentication.

  • adkim & aspf: Specifies the alignment mode for DKIM and SPF, both set to r (relaxed alignment) by default. A relaxed alignment is recommended for DMARC in DNS services.

Once you've added and verified the DMARC record with your DNS provider, all receiving email servers can authenticate incoming emails from your domain and handle any failures according to your specified policy.

How to check if this has been updated correctly:

MX Toolbox is a free site that can

2. Enter your store's email domain into the text box

3. Click DMARC Lookup

4. Check your DMARC Records:

  • CORRECT: If they are set-up correctly, you'll see green ticks next to each DMARC record-setting. For example:

  • INCORRECT: If you are missing something, you'll need to go back through the process above to ensure your DMARC Policy has the correct settings.

For example:

📝 Note: Marsello Support cannot assist with DMARC record setup. The DMARC policy configuration is unique to your business needs and your DNS provider. Please consult your IT administrator or DNS settings manager for assistance.

Successfully added the DMARC Policy

Congratulations on your DMARC setting check green ticks – This means that your emails will be able to be sent by your sender domain via Marsello 🎉

Taking these actions will safeguard your emails from potential spam flags and guarantee that your messages reach your customers seamlessly.


After incorporating these DNS records and ensuring their verification by Marsello and your DNS provider, the DKIM signature will be incorporated into the headers of your dispatched emails. This alignment corresponds to the configured CNAME entries associated with the signature.

Please also make sure to continue to adhere to these sending guidelines to maintain effective communication through your branded email address.


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