---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/sendgrid/api-reference/sender-identities-api#article
headline: Sender Identities API
description: Use the SendGrid Sender Identities API to create, view, update, delete, and verify the sender identities you use to send Marketing Campaigns email.
url: https://www.twilio.com/docs/sendgrid/api-reference/sender-identities-api
inLanguage: en
dateModified: 2026-07-02T17:35:39.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# Sender Identities API

> \[!WARNING]
>
> This covers the obsolete Legacy Marketing Campaigns API.

> \[!NOTE]
>
> To learn more about the Sender Identities API, see the [Marketing Campaigns Senders API][].

To protect your sending reputation and to uphold legitimate sending behavior, Twilio SendGrid requires customers to verify their [Sender Identities][]. Use either [Domain Authentication][] or Single Sender Verification.

[Marketing Campaigns Senders API]: /docs/sendgrid/api-reference/senders

[Sender Identities]: /docs/sendgrid/for-developers/sending-email/sender-identity

[Domain Authentication]: /docs/sendgrid/ui/account-and-settings/how-to-set-up-domain-authentication