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What is a sender?

A sender is a reusable identity that represents the “from” address on your emails. Instead of typing the full sender name, email, and reply-to address every time, you create a sender once and use it across campaigns, templates, and automations. A sender is made up of:
FieldExampleDescription
NamePaulo from SendKitThe display name recipients see in their inbox
UsernamepauloThe local part of the email address (before the @)
Domainsendkit.devA verified domain from your account
Reply-tosupport@sendkit.devOptional. Where replies go if different from the sender address
This produces a “from” address like: Paulo from SendKit <paulo@sendkit.dev>

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Creating a sender

You can create senders from the SendKit dashboard.
1

Verify a domain

You need at least one verified domain before creating a sender. Go to Domains and verify your domain with the required DNS records.
2

Create the sender

Go to Senders and click Create Sender. Fill in the name, username, and select your verified domain. Optionally set a reply-to address.
3

Use it everywhere

Your sender is now available in campaigns, templates, and automations.

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Reply-to address

The reply-to field is optional. When set, replies from recipients go to this address instead of the sender address. This is useful when:
  • Your sender address is a no-reply address (e.g., notifications@yourdomain.com)
  • You want replies to go to a shared inbox (e.g., support@yourdomain.com)
  • You use a different address for customer communication
If left empty, replies go directly to the sender address.

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Using senders in the API

When sending emails via the API, you pass the full “from” address directly — you don’t reference a sender by ID. Senders are primarily used in the dashboard for campaigns, templates, and automations.
The domain in the “from” address must be a verified domain in your account. Emails from unverified domains will be rejected.

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Deleting a sender

A sender can only be deleted if it’s not currently used by any campaign or template. If it’s in use, you’ll need to update those campaigns or templates to use a different sender first.

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FAQ

Yes. You can create as many senders as you need on the same domain — for example, support@yourdomain.com, notifications@yourdomain.com, and marketing@yourdomain.com.
Not on the same domain. Each username must be unique per domain. However, you can use the same username on different domains (e.g., hello@domain-a.com and hello@domain-b.com).
Letters, numbers, dots, underscores, percent signs, plus signs, and hyphens. For example: hello, no-reply, info.team, news+updates.