Overview

Email sending domains control which addresses your platform is allowed to send from, and which addresses it's allowed to send to. They sit inside your gateway settings and act as a safety net — your platform will only process email traffic involving domains on these lists.

You'll find two lists to manage: Senders for the domains your emails can be sent from (the bit after the @ in your "from" address), and Recipients for the domains your emails are allowed to be delivered to. Both work the same way, just at different ends of the journey.

This is mostly a "set it once and leave it" area, but you'll come back to it whenever you add a new sending domain, onboard a new client domain, or want to lock down test environments so emails can only reach approved inboxes.

Admin access only
‍These settings are restricted to nominated System Administrators. If you can't see the Gateway settings tab or the Allowed Domains section, you won't have the right permissions — speak to your administrator if you need a domain added or removed.

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Where to find it

Sender and recipient domains live in your company-wide gateway settings. For the full rundown of everything on that page — test mode, send caps, link tracking, gateway credentials and more — see the Configure Email Default Gateway Settings guide.

1. In the secondary navigation menu, click Edit settings under Send settings.
2. Click the Gateway settings tab at the top of the page.
3. Scroll down Email section and find Allowed Domains. You'll see two lists: Senders and Recipients.

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Add a sender domain

Sender domains are the domains your emails are allowed to send from. If you want to send from hello@yourcompany.com, then yourcompany.com needs to be on this list. Without it, the platform will block the send before it leaves the gate.

1. In the Senders list, click + Add new.
2. Enter the domain name (just the domain — no @ symbol and no email prefix). For example, yourcompany.com.
3. Click Save. The new domain will appear in the list straight away.

That's it — any "from" address using that domain is now approved for sending. If you ever need to tweak or remove a sender, click the Settings icon next to it in the list.

Don't forget the SPF and DKIM setup
‍Adding a sender domain here approves it on the platform, but it won't actually deliver reliably until the SPF and DKIM records are configured for that domain. Once you've added a new sender, raise a support ticket so the team can get those records set up for you.

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Add a recipient domain

Recipient domains control where your emails are allowed to land. This is especially handy in test or staging environments, where you want to make sure test emails can only reach internal inboxes and never accidentally end up with a real customer.

1. In the Recipients list, click + Add new.
2. Enter the recipient domain (for example, yourcompany.com for internal addresses, or gmail.com if you want to allow personal accounts).
3. Click Save. The new domain is now on the approved list.

Your platform will now deliver to any address on that domain. As with senders, you can edit or remove a recipient domain at any time via the Settings icon beside it.

A note on production environments
‍In production, the Recipients list is usually left open or configured to allow all domains so real customers can receive your communications. Tight recipient restrictions are most useful in test, UAT, or staging environments where accidental sends to real people could cause headaches.

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Edit or remove a domain

Need to fix a typo, or retire a domain that's no longer in use? Both lists work the same way.

1. Click the Settings icon next to the domain you want to change.
2. Update the domain name, or choose to remove it.
3. Click Save to apply your changes.

Just be aware that removing a sender domain will stop any future sends using that domain, and removing a recipient domain will block delivery to any address on it. If you've got campaigns scheduled or templates configured with that domain, it's worth a quick check before you remove anything.

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What's next

Sender and recipient domains are one piece of your wider gateway configuration. To set up the rest — gateway provider, API credentials, send limits, link tracking and test mode — head over to the Configure Email Default Gateway Settings guide.

And if you need different domain rules for a specific Application rather than the whole platform, you can override these settings at the Application level in Gateway settings.

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