To protect your sending reputation and to uphold legitimate sending behavior, Twilio SendGrid requires customers to verify their Sender Identities.
You can verify one or more Sender Identities using either Domain Authentication or Single Sender Verification.
The Senders API allows you to complete Single Sender Verification programmatically. Though you will need to complete Domain Authentication before sending email, Single Sender Verification is a quick way to verify a single email address.
After completing Domain Authentication, any email address that matches the authenticated domain will be automatically verified as a Sender Identity. For example, if you authenticate example.com, any email address ending in @example.com will be verified.
Even after completing Domain Authentication, you will want to use the SendGrid Console or the Senders API to ensure that the details associated with your Sender Identities are accurate. You are required to include your contact information, including a physical mailing address, inside every promotional email you send in order to comply with anti-spam laws such as CAN-SPAM and CASL.
You can use the Senders API to retrieve and update the details of your verified Sender Identities, whether they were verified through Single Sender Verification or Domain Authentication.