Default Headers for Dedicated Sending Domains

When to Use a Default Header

Set the From Name and From Email once at the domain level, and every campaign and workflow sent through that domain uses it automatically — even if a teammate types a different From Name or From Email into an individual campaign or workflow, the Default Header takes over at send time.

Industries with strict communication standards — such as finance and healthcare — can lock every outbound email to a single, approved sender identity by setting a Default Header, removing the risk of any individual campaign or workflow going out under an unapproved From Name or From Email.

Prerequisites

Default Headers can only be set on dedicated sending domains managed within a sub-account. Agency-level domains do not support per-sub-account Default Header configuration.

You must have completed DNS setup — including CNAME, DKIM, and SPF records — for your custom sending domain (e.g., email.yourbrand.com).

A green checkmark next to your domain under Settings → Email Service → SMTP Service → Dedicated Domain and IP confirms it is validated and ready.

Setting the Default Header (From Name & From Email)

Once saved, the Default Header always overrides the From Name and From Email configured on any campaign or workflow sent through this dedicated domain — there is no condition attached, it applies to every send. If you leave the Default Header fields blank, emails are sent using whatever From Name and From Email is set at the campaign or workflow level instead.

How the Override Works in Practice

When creating a broadcast or workflow email, you can still set a campaign-level From Name and From Email as usual. This is what will be used only if no Default Header is configured for the sending domain.

At the moment the email sends, the platform checks whether a Default Header is saved for the dedicated domain. If one is set, it takes priority automatically — the campaign's or workflow's own From Name and From Email are ignored, not just used as a backup.

• If a Default Header is set, recipients always see that From Name and From Email — regardless of what was entered on the campaign or workflow.
• Because the address comes from your authenticated sending domain, the email stays DMARC-compliant and is less likely to be rejected or flagged as spam.

Example: Default Header Set vs. Left Blank

From: YourBrand Support <support@email.yourbrand.com>
The campaign's "Jane from YourBrand" name and address are ignored completely, even though they were correctly configured and properly aligned to the domain.

From: Jane from YourBrand <jane@email.yourbrand.com>
With no Default Header saved for the domain, the campaign's own From Name and From Email are used as configured.

1. Save a Default Header whose From Name and From Email differ from a campaign's configured values.
2. Send a test broadcast or workflow email from that campaign.
3. Open the received email and check the From address — it should match the Default Header, not the campaign's configured From Name or Email.

Best Practices & Considerations

Because the Default Header overrides every campaign and workflow sent through the domain, confirm this is the sender identity you want used across the board before saving it. Any campaign-level From Name or From Email your team configures afterward will be ignored while the Default Header is active.

The Default Header's From Email can be any address on your sending domain, but ensure that mailbox is actively monitored or aliased correctly (e.g., support@yourbrand.com forwarding to the right team) so customer replies don't go unread.

Send a small internal test to confirm the Default Header is being applied. Check that the From Name and From Email recipients actually see match your Default Header configuration — not whatever was typed into the campaign or workflow.

A Default Header silently overrides whatever From Name and From Email a teammate configures at the campaign or workflow level. Make sure anyone building campaigns or workflows on this domain knows a Default Header is active, so they aren't confused when their custom From address never actually gets used.

If you manage multiple brands or departments, create separate sub-accounts — each with its own dedicated domain and Default Header — for fully isolated sending control and reputation management.

Common Troubleshooting Scenarios

Frequently Asked Questions