users
Lists the send-as aliases for the specified account. The result includes the primary send-as address associated with the account as well as any custom "from" aliases. For more information, see Manage aliases and signatures with the Gmail API.
get/gmail/v1/users/{userId}/settings/sendAs
Path parameters
userIdstring required
User's email address. The special value "me" can be used to indicate the authenticated user.
Response
Successful response