Remove the organization's custom SMTP server configuration. This also resets the shared senderName, replyToAddress, and globalBccAddresses email-branding fields.

Usage notes

• To perform this operation, you must use API credentials owned by a user assigned an account type with the Manage email branding permission enabled.
• To read or update SMTP settings for a tenant organization, use impersonation to obtain a token for that tenant, then call this endpoint with that token.
• If custom SMTP has not been configured for the organization, this endpoint returns a 404.